ata: libata-scsi: fix ata_dsm_trim_pages() kernel-docgrafted

make htmldocs fails with:

  Documentation/driver-api/libata:604: ./drivers/ata/libata-scsi.c:2301:
  ERROR: Unexpected indentation. [docutils]

The Return: section of ata_dsm_trim_pages() ends its first sentence with
a colon and continues with an indented bullet list. reStructuredText
requires a blank line before an indented block, so docutils chokes on
the list.

Simply adding the missing blank line does not work either: Return: is a
kernel-doc "special section", which is terminated by the first blank
line, so the bullet list would end up in the Description section,
detached from the sentence introducing it.

Spell the two bounds out as prose instead, so that the Return: section
stays self-contained. Documentation-only change.

Fixes: e64e6b5dc867 ("ata: libata-scsi: scale DSM TRIM payload by MAX PAGES PER DSM COMMAND")
Reported-by: Thomas Huth <thuth@redhat.com>
Closes: https://lore.kernel.org/linux-ide/b0a0b8e8-cc4f-4c7b-8bc5-fee0712d405a@redhat.com/
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20260916130031.29990-2-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>

17 files changed, 9765 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
new file mode 100644
index 000000000..f0e72d4b6
--- /dev/null
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -0,0 +1,217 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config DRM_APPLETBDRM
+	tristate "DRM support for Apple Touch Bars"
+	depends on DRM && USB && MMU
+	depends on X86 || COMPILE_TEST
+	select DRM_GEM_SHMEM_HELPER
+	select DRM_KMS_HELPER
+	help
+	  Say Y here if you want support for the display of Touch Bars on x86
+	  MacBook Pros.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called appletbdrm.
+
+config DRM_ARCPGU
+	tristate "ARC PGU"
+	depends on DRM && OF
+	select DRM_CLIENT_SELECTION
+	select DRM_GEM_DMA_HELPER
+	select DRM_KMS_HELPER
+	help
+	  Choose this option if you have an ARC PGU controller.
+
+	  If M is selected the module will be called arcpgu.
+
+config DRM_BOCHS
+	tristate "DRM Support for bochs dispi vga interface (qemu stdvga)"
+	depends on DRM && PCI && MMU
+	select DRM_CLIENT_SELECTION
+	select DRM_GEM_SHMEM_HELPER
+	select DRM_KMS_HELPER
+	help
+	  This is a KMS driver for qemu's stdvga output. Choose this option
+	  for qemu.
+
+	  If M is selected the module will be called bochs.
+
+config DRM_CIRRUS_QEMU
+	tristate "Cirrus driver for QEMU emulated device"
+	depends on DRM && PCI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_SHMEM_HELPER
+	help
+	 This is a KMS driver for emulated cirrus device in qemu.
+	 It is *NOT* intended for real cirrus devices. This requires
+	 the modesetting userspace X.org driver.
+
+	 Cirrus is obsolete, the hardware was designed in the 90ies
+	 and can't keep up with todays needs.  More background:
+	 https://www.kraxel.org/blog/2014/10/qemu-using-cirrus-considered-harmful/
+
+	 Better alternatives are:
+	   - stdvga (DRM_BOCHS, qemu -vga std, default in qemu 2.2+)
+	   - qxl (DRM_QXL, qemu -vga qxl, works best with spice)
+	   - virtio (DRM_VIRTIO_GPU), qemu -vga virtio)
+
+config DRM_GM12U320
+	tristate "GM12U320 driver for USB projectors"
+	depends on DRM && USB && MMU
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_SHMEM_HELPER
+	help
+	 This is a KMS driver for projectors which use the GM12U320 chipset
+	 for video transfer over USB2/3, such as the Acer C120 mini projector.
+
+config DRM_PANEL_MIPI_DBI
+	tristate "DRM support for MIPI DBI compatible panels"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select DRM_MIPI_DBI
+	select BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+	help
+	  Say Y here if you want to enable support for MIPI DBI compatible
+	  panels. The controller command setup can be provided using a
+	  firmware file. For more information see
+	  https://github.com/notro/panel-mipi-dbi/wiki.
+	  To compile this driver as a module, choose M here.
+
+config DRM_PIXPAPER
+        tristate "DRM support for PIXPAPER display panels"
+        depends on DRM && SPI
+        depends on MMU
+        select DRM_CLIENT_SELECTION
+        select DRM_GEM_SHMEM_HELPER
+        select DRM_KMS_HELPER
+        help
+	  DRM driver for the Mayqueen Pixpaper e-ink display panel.
+
+	  This driver supports small e-paper displays connected over SPI,
+	  with a resolution of 122x250 and XRGB8888 framebuffer format.
+	  It is intended for low-power embedded applications.
+
+	  If M is selected, the module will be built as pixpaper.ko.
+
+config TINYDRM_HX8357D
+	tristate "DRM support for HX8357D display panels"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select DRM_MIPI_DBI
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  DRM driver for the following HX8357D panels:
+	  * YX350HV15-T 3.5" 340x350 TFT (Adafruit 3.5")
+
+	  If M is selected the module will be called hx8357d.
+
+config TINYDRM_ILI9163
+	tristate "DRM support for ILI9163 display panels"
+	depends on DRM && SPI
+	select BACKLIGHT_CLASS_DEVICE
+	select DRM_CLIENT_SELECTION
+	select DRM_GEM_DMA_HELPER
+	select DRM_KMS_HELPER
+	select DRM_MIPI_DBI
+	help
+	  DRM driver for the following Ilitek ILI9163 panels:
+	  * NHD-1.8-128160EF 128x160 TFT
+
+	  If M is selected the module will be called ili9163.
+
+config TINYDRM_ILI9225
+	tristate "DRM support for ILI9225 display panels"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select DRM_MIPI_DBI
+	help
+	  DRM driver for the following Ilitek ILI9225 panels:
+	  * No-name 2.2" color screen module
+
+	  If M is selected the module will be called ili9225.
+
+config TINYDRM_ILI9341
+	tristate "DRM support for ILI9341 display panels"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select DRM_MIPI_DBI
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  DRM driver for the following Ilitek ILI9341 panels:
+	  * YX240QV29-T 2.4" 240x320 TFT (Adafruit 2.4")
+
+	  If M is selected the module will be called ili9341.
+
+config TINYDRM_ILI9486
+	tristate "DRM support for ILI9486 display panels"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select DRM_MIPI_DBI
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  DRM driver for the following Ilitek ILI9486 panels:
+	  * PISCREEN 3.5" 320x480 TFT (Ozzmaker 3.5")
+	  * RPILCD 3.5" 320x480 TFT (Waveshare 3.5")
+
+	  If M is selected the module will be called ili9486.
+
+config TINYDRM_MI0283QT
+	tristate "DRM support for MI0283QT"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	select DRM_MIPI_DBI
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  DRM driver for the Multi-Inno MI0283QT display panel
+	  If M is selected the module will be called mi0283qt.
+
+config TINYDRM_REPAPER
+	tristate "DRM support for Pervasive Displays RePaper panels (V231)"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_KMS_HELPER
+	select DRM_GEM_DMA_HELPER
+	help
+	  DRM driver for the following Pervasive Displays panels:
+	  1.44" TFT EPD Panel (E1144CS021)
+	  1.90" TFT EPD Panel (E1190CS021)
+	  2.00" TFT EPD Panel (E2200CS021)
+	  2.71" TFT EPD Panel (E2271CS021)
+
+	  If M is selected the module will be called repaper.
+
+config TINYDRM_SHARP_MEMORY
+	tristate "DRM support for Sharp Memory LCD panels"
+	depends on DRM && SPI
+	select DRM_CLIENT_SELECTION
+	select DRM_GEM_DMA_HELPER
+	select DRM_KMS_HELPER
+	help
+	  DRM Driver for the following Sharp Memory Panels:
+	  * 1.00" Sharp Memory LCD (LS010B7DH04)
+	  * 1.10" Sharp Memory LCD (LS011B7DH03)
+	  * 1.20" Sharp Memory LCD (LS012B7DD01)
+	  * 1.28" Sharp Memory LCD (LS013B7DH03)
+	  * 1.26" Sharp Memory LCD (LS013B7DH05)
+	  * 1.80" Sharp Memory LCD (LS018B7DH02)
+	  * 2.70" Sharp Memory LCD (LS027B7DH01)
+	  * 2.70" Sharp Memory LCD (LS027B7DH01A)
+	  * 3.20" Sharp Memory LCD (LS032B7DD02)
+	  * 4.40" Sharp Memory LCD (LS044Q7DH01)
+
+	  If M is selected the module will be called sharp_memory.
diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
new file mode 100644
index 000000000..48d30bf61
--- /dev/null
+++ b/drivers/gpu/drm/tiny/Makefile
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_DRM_APPLETBDRM)		+= appletbdrm.o
+obj-$(CONFIG_DRM_ARCPGU)		+= arcpgu.o
+obj-$(CONFIG_DRM_BOCHS)			+= bochs.o
+obj-$(CONFIG_DRM_CIRRUS_QEMU)		+= cirrus-qemu.o
+obj-$(CONFIG_DRM_GM12U320)		+= gm12u320.o
+obj-$(CONFIG_DRM_PANEL_MIPI_DBI)	+= panel-mipi-dbi.o
+obj-$(CONFIG_DRM_PIXPAPER)              += pixpaper.o
+obj-$(CONFIG_TINYDRM_HX8357D)		+= hx8357d.o
+obj-$(CONFIG_TINYDRM_ILI9163)		+= ili9163.o
+obj-$(CONFIG_TINYDRM_ILI9225)		+= ili9225.o
+obj-$(CONFIG_TINYDRM_ILI9341)		+= ili9341.o
+obj-$(CONFIG_TINYDRM_ILI9486)		+= ili9486.o
+obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
+obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o
+obj-$(CONFIG_TINYDRM_SHARP_MEMORY)	+= sharp-memory.o
diff --git a/drivers/gpu/drm/tiny/appletbdrm.c b/drivers/gpu/drm/tiny/appletbdrm.c
new file mode 100644
index 000000000..ef71b9957
--- /dev/null
+++ b/drivers/gpu/drm/tiny/appletbdrm.c
@@ -0,0 +1,841 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Apple Touch Bar DRM Driver
+ *
+ * Copyright (c) 2023 Kerem Karabay <kekrby@gmail.com>
+ */
+
+#include <linux/align.h>
+#include <linux/array_size.h>
+#include <linux/bitops.h>
+#include <linux/bug.h>
+#include <linux/container_of.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/overflow.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+#include <linux/usb.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#define APPLETBDRM_PIXEL_FORMAT		cpu_to_le32(0x52474241) /* RGBA, the actual format is BGR888 */
+#define APPLETBDRM_BITS_PER_PIXEL	24
+
+#define APPLETBDRM_MSG_CLEAR_DISPLAY	cpu_to_le32(0x434c5244) /* CLRD */
+#define APPLETBDRM_MSG_GET_INFORMATION	cpu_to_le32(0x47494e46) /* GINF */
+#define APPLETBDRM_MSG_UPDATE_COMPLETE	cpu_to_le32(0x5544434c) /* UDCL */
+#define APPLETBDRM_MSG_SIGNAL_READINESS	cpu_to_le32(0x52454459) /* REDY */
+
+#define APPLETBDRM_BULK_MSG_TIMEOUT	1000
+
+#define drm_to_adev(_drm)		container_of(_drm, struct appletbdrm_device, drm)
+#define adev_to_udev(adev)		interface_to_usbdev(to_usb_interface((adev)->drm.dev))
+
+struct appletbdrm_msg_request_header {
+	__le16 unk_00;
+	__le16 unk_02;
+	__le32 unk_04;
+	__le32 unk_08;
+	__le32 size;
+} __packed;
+
+struct appletbdrm_msg_response_header {
+	u8 unk_00[16];
+	__le32 msg;
+} __packed;
+
+struct appletbdrm_msg_simple_request {
+	struct appletbdrm_msg_request_header header;
+	__le32 msg;
+	u8 unk_14[8];
+	__le32 size;
+} __packed;
+
+struct appletbdrm_msg_information {
+	struct appletbdrm_msg_response_header header;
+	u8 unk_14[12];
+	__le32 width;
+	__le32 height;
+	u8 bits_per_pixel;
+	__le32 bytes_per_row;
+	__le32 orientation;
+	__le32 bitmap_info;
+	__le32 pixel_format;
+	__le32 width_inches;	/* floating point */
+	__le32 height_inches;	/* floating point */
+} __packed;
+
+struct appletbdrm_frame {
+	__le16 begin_x;
+	__le16 begin_y;
+	__le16 width;
+	__le16 height;
+	__le32 buf_size;
+	u8 buf[];
+} __packed;
+
+struct appletbdrm_fb_request_footer {
+	u8 unk_00[12];
+	__le32 unk_0c;
+	u8 unk_10[12];
+	__le32 unk_1c;
+	__le64 timestamp;
+	u8 unk_28[12];
+	__le32 unk_34;
+	u8 unk_38[20];
+	__le32 unk_4c;
+} __packed;
+
+struct appletbdrm_fb_request {
+	struct appletbdrm_msg_request_header header;
+	__le16 unk_10;
+	u8 msg_id;
+	u8 unk_13[29];
+	/*
+	 * Contents of `data`:
+	 * - struct appletbdrm_frame frames[];
+	 * - struct appletbdrm_fb_request_footer footer;
+	 * - padding to make the total size a multiple of 16
+	 */
+	u8 data[];
+} __packed;
+
+struct appletbdrm_fb_request_response {
+	struct appletbdrm_msg_response_header header;
+	u8 unk_14[12];
+	__le64 timestamp;
+} __packed;
+
+struct appletbdrm_device {
+	unsigned int in_ep;
+	unsigned int out_ep;
+
+	unsigned int width;
+	unsigned int height;
+
+	struct drm_device drm;
+	struct drm_display_mode mode;
+	struct drm_connector connector;
+	struct drm_plane primary_plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+};
+
+struct appletbdrm_plane_state {
+	struct drm_shadow_plane_state base;
+	struct appletbdrm_fb_request *request;
+	struct appletbdrm_fb_request_response *response;
+	size_t request_size;
+	size_t frames_size;
+};
+
+static inline struct appletbdrm_plane_state *to_appletbdrm_plane_state(struct drm_plane_state *state)
+{
+	return container_of(state, struct appletbdrm_plane_state, base.base);
+}
+
+static int appletbdrm_send_request(struct appletbdrm_device *adev,
+				   struct appletbdrm_msg_request_header *request, size_t size)
+{
+	struct usb_device *udev = adev_to_udev(adev);
+	struct drm_device *drm = &adev->drm;
+	int ret, actual_size;
+
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, adev->out_ep),
+			   request, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
+	if (ret) {
+		drm_err(drm, "Failed to send message (%d)\n", ret);
+		return ret;
+	}
+
+	if (actual_size != size) {
+		drm_err(drm, "Actual size (%d) doesn't match expected size (%zu)\n",
+			actual_size, size);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int appletbdrm_read_response(struct appletbdrm_device *adev,
+				    struct appletbdrm_msg_response_header *response,
+				    size_t size, __le32 expected_response)
+{
+	struct usb_device *udev = adev_to_udev(adev);
+	struct drm_device *drm = &adev->drm;
+	int ret, actual_size;
+	bool readiness_signal_received = false;
+
+retry:
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
+			   response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
+	if (ret) {
+		drm_err(drm, "Failed to read response (%d)\n", ret);
+		return ret;
+	}
+
+	/*
+	 * The device responds to the first request sent in a particular
+	 * timeframe after the USB device configuration is set with a readiness
+	 * signal, in which case the response should be read again
+	 */
+	if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
+		if (!readiness_signal_received) {
+			readiness_signal_received = true;
+			goto retry;
+		}
+
+		drm_err(drm, "Encountered unexpected readiness signal\n");
+		return -EINTR;
+	}
+
+	if (actual_size != size) {
+		drm_err(drm, "Actual size (%d) doesn't match expected size (%zu)\n",
+			actual_size, size);
+		return -EBADMSG;
+	}
+
+	if (response->msg != expected_response) {
+		drm_err(drm, "Unexpected response from device (expected %p4cl found %p4cl)\n",
+			&expected_response, &response->msg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int appletbdrm_send_msg(struct appletbdrm_device *adev, __le32 msg)
+{
+	struct appletbdrm_msg_simple_request *request;
+	int ret;
+
+	request = kzalloc_obj(*request);
+	if (!request)
+		return -ENOMEM;
+
+	request->header.unk_00 = cpu_to_le16(2);
+	request->header.unk_02 = cpu_to_le16(0x1512);
+	request->header.size = cpu_to_le32(sizeof(*request) - sizeof(request->header));
+	request->msg = msg;
+	request->size = request->header.size;
+
+	ret = appletbdrm_send_request(adev, &request->header, sizeof(*request));
+
+	kfree(request);
+
+	return ret;
+}
+
+static int appletbdrm_clear_display(struct appletbdrm_device *adev)
+{
+	return appletbdrm_send_msg(adev, APPLETBDRM_MSG_CLEAR_DISPLAY);
+}
+
+static int appletbdrm_signal_readiness(struct appletbdrm_device *adev)
+{
+	return appletbdrm_send_msg(adev, APPLETBDRM_MSG_SIGNAL_READINESS);
+}
+
+static int appletbdrm_get_information(struct appletbdrm_device *adev)
+{
+	struct appletbdrm_msg_information *info;
+	struct drm_device *drm = &adev->drm;
+	u8 bits_per_pixel;
+	__le32 pixel_format;
+	int ret;
+
+	info = kzalloc_obj(*info);
+	if (!info)
+		return -ENOMEM;
+
+	ret = appletbdrm_send_msg(adev, APPLETBDRM_MSG_GET_INFORMATION);
+	if (ret)
+		return ret;
+
+	ret = appletbdrm_read_response(adev, &info->header, sizeof(*info),
+				       APPLETBDRM_MSG_GET_INFORMATION);
+	if (ret)
+		goto free_info;
+
+	bits_per_pixel = info->bits_per_pixel;
+	pixel_format = get_unaligned(&info->pixel_format);
+
+	adev->width = get_unaligned_le32(&info->width);
+	adev->height = get_unaligned_le32(&info->height);
+
+	if (bits_per_pixel != APPLETBDRM_BITS_PER_PIXEL) {
+		drm_err(drm, "Encountered unexpected bits per pixel value (%d)\n", bits_per_pixel);
+		ret = -EINVAL;
+		goto free_info;
+	}
+
+	if (pixel_format != APPLETBDRM_PIXEL_FORMAT) {
+		drm_err(drm, "Encountered unknown pixel format (%p4cl)\n", &pixel_format);
+		ret = -EINVAL;
+		goto free_info;
+	}
+
+free_info:
+	kfree(info);
+
+	return ret;
+}
+
+static u32 rect_size(struct drm_rect *rect)
+{
+	return drm_rect_width(rect) * drm_rect_height(rect) *
+		(BITS_TO_BYTES(APPLETBDRM_BITS_PER_PIXEL));
+}
+
+static int appletbdrm_connector_helper_get_modes(struct drm_connector *connector)
+{
+	struct appletbdrm_device *adev = drm_to_adev(connector->dev);
+
+	return drm_connector_helper_get_modes_fixed(connector, &adev->mode);
+}
+
+static const u32 appletbdrm_primary_plane_formats[] = {
+	DRM_FORMAT_BGR888,
+	DRM_FORMAT_XRGB8888, /* emulated */
+};
+
+static int appletbdrm_primary_plane_helper_begin_fb_access(struct drm_plane *plane,
+							   struct drm_plane_state *new_plane_state)
+{
+	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(new_plane_state);
+	size_t frames_size = 0;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect damage;
+	size_t request_size;
+
+	drm_atomic_helper_damage_iter_init(&iter, plane->state, new_plane_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		frames_size += struct_size((struct appletbdrm_frame *)0, buf, rect_size(&damage));
+	}
+
+	if (!frames_size)
+		return 0;
+
+	request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
+		       frames_size +
+		       sizeof(struct appletbdrm_fb_request_footer), 16);
+
+	appletbdrm_state->request = kvzalloc(request_size, GFP_KERNEL);
+
+	if (!appletbdrm_state->request)
+		return -ENOMEM;
+
+	appletbdrm_state->response = kzalloc_obj(*appletbdrm_state->response);
+
+	if (!appletbdrm_state->response)
+		return -ENOMEM;
+
+	appletbdrm_state->request_size = request_size;
+	appletbdrm_state->frames_size = frames_size;
+
+	return drm_gem_begin_shadow_fb_access(plane, new_plane_state);
+}
+
+static int appletbdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
+							struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+	int ret;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+	else if (!new_plane_state->visible)
+		return 0;
+
+	return 0;
+}
+
+static int appletbdrm_flush_damage(struct appletbdrm_device *adev,
+				   struct drm_plane_state *old_state,
+				   struct drm_plane_state *state)
+{
+	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
+	struct appletbdrm_fb_request_response *response = appletbdrm_state->response;
+	struct appletbdrm_fb_request_footer *footer;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_framebuffer *fb = state->fb;
+	struct appletbdrm_fb_request *request = appletbdrm_state->request;
+	struct drm_device *drm = &adev->drm;
+	struct appletbdrm_frame *frame;
+	u64 timestamp = ktime_get_ns();
+	struct drm_rect damage;
+	size_t frames_size = appletbdrm_state->frames_size;
+	size_t request_size = appletbdrm_state->request_size;
+	int ret;
+
+	if (!frames_size)
+		return 0;
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret) {
+		drm_err(drm, "Failed to start CPU framebuffer access (%d)\n", ret);
+		goto end_fb_cpu_access;
+	}
+
+	request->header.unk_00 = cpu_to_le16(2);
+	request->header.unk_02 = cpu_to_le16(0x12);
+	request->header.unk_04 = cpu_to_le32(9);
+	request->header.size = cpu_to_le32(request_size - sizeof(request->header));
+	request->unk_10 = cpu_to_le16(1);
+	request->msg_id = timestamp;
+
+	frame = (struct appletbdrm_frame *)request->data;
+
+	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		struct drm_rect dst_clip = state->dst;
+		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(frame->buf);
+		u32 buf_size = rect_size(&damage);
+
+		if (!drm_rect_intersect(&dst_clip, &damage))
+			continue;
+
+		/*
+		 * The coordinates need to be translated to the coordinate
+		 * system the device expects, see the comment in
+		 * appletbdrm_setup_mode_config
+		 */
+		frame->begin_x = cpu_to_le16(damage.y1);
+		frame->begin_y = cpu_to_le16(adev->height - damage.x2);
+		frame->width = cpu_to_le16(drm_rect_height(&damage));
+		frame->height = cpu_to_le16(drm_rect_width(&damage));
+		frame->buf_size = cpu_to_le32(buf_size);
+
+		switch (fb->format->format) {
+		case DRM_FORMAT_XRGB8888:
+			drm_fb_xrgb8888_to_bgr888(&dst, NULL, &shadow_plane_state->data[0], fb, &damage, &shadow_plane_state->fmtcnv_state);
+			break;
+		default:
+			drm_fb_memcpy(&dst, NULL, &shadow_plane_state->data[0], fb, &damage);
+			break;
+		}
+
+		frame = (void *)frame + struct_size(frame, buf, buf_size);
+	}
+
+	footer = (struct appletbdrm_fb_request_footer *)&request->data[frames_size];
+
+	footer->unk_0c = cpu_to_le32(0xfffe);
+	footer->unk_1c = cpu_to_le32(0x80001);
+	footer->unk_34 = cpu_to_le32(0x80002);
+	footer->unk_4c = cpu_to_le32(0xffff);
+	footer->timestamp = cpu_to_le64(timestamp);
+
+	ret = appletbdrm_send_request(adev, &request->header, request_size);
+	if (ret)
+		goto end_fb_cpu_access;
+
+	ret = appletbdrm_read_response(adev, &response->header, sizeof(*response),
+				       APPLETBDRM_MSG_UPDATE_COMPLETE);
+	if (ret)
+		goto end_fb_cpu_access;
+
+	if (response->timestamp != footer->timestamp) {
+		drm_err(drm, "Response timestamp (%llu) doesn't match request timestamp (%llu)\n",
+			le64_to_cpu(response->timestamp), timestamp);
+		goto end_fb_cpu_access;
+	}
+
+end_fb_cpu_access:
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+
+	return ret;
+}
+
+static void appletbdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
+							  struct drm_atomic_commit *old_state)
+{
+	struct appletbdrm_device *adev = drm_to_adev(plane->dev);
+	struct drm_device *drm = plane->dev;
+	struct drm_plane_state *plane_state = plane->state;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(old_state, plane);
+	int idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	appletbdrm_flush_damage(adev, old_plane_state, plane_state);
+
+	drm_dev_exit(idx);
+}
+
+static void appletbdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
+							   struct drm_atomic_commit *state)
+{
+	struct drm_device *dev = plane->dev;
+	struct appletbdrm_device *adev = drm_to_adev(dev);
+	int idx;
+
+	if (!drm_dev_enter(dev, &idx))
+		return;
+
+	appletbdrm_clear_display(adev);
+
+	drm_dev_exit(idx);
+}
+
+static void appletbdrm_primary_plane_reset(struct drm_plane *plane)
+{
+	struct appletbdrm_plane_state *appletbdrm_state;
+
+	WARN_ON(plane->state);
+
+	appletbdrm_state = kzalloc_obj(*appletbdrm_state);
+	if (!appletbdrm_state)
+		return;
+
+	__drm_gem_reset_shadow_plane(plane, &appletbdrm_state->base);
+}
+
+static struct drm_plane_state *appletbdrm_primary_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct drm_shadow_plane_state *new_shadow_plane_state;
+	struct appletbdrm_plane_state *appletbdrm_state;
+
+	if (WARN_ON(!plane->state))
+		return NULL;
+
+	appletbdrm_state = kzalloc_obj(*appletbdrm_state);
+	if (!appletbdrm_state)
+		return NULL;
+
+	/* Request and response are not duplicated and are allocated in .atomic_check */
+	appletbdrm_state->request = NULL;
+	appletbdrm_state->response = NULL;
+
+	appletbdrm_state->request_size = 0;
+	appletbdrm_state->frames_size = 0;
+
+	new_shadow_plane_state = &appletbdrm_state->base;
+
+	__drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
+
+	return &new_shadow_plane_state->base;
+}
+
+static void appletbdrm_primary_plane_destroy_state(struct drm_plane *plane,
+						   struct drm_plane_state *state)
+{
+	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
+
+	kvfree(appletbdrm_state->request);
+	kfree(appletbdrm_state->response);
+
+	__drm_gem_destroy_shadow_plane_state(&appletbdrm_state->base);
+
+	kfree(appletbdrm_state);
+}
+
+static const struct drm_plane_helper_funcs appletbdrm_primary_plane_helper_funcs = {
+	.begin_fb_access = appletbdrm_primary_plane_helper_begin_fb_access,
+	.end_fb_access = drm_gem_end_shadow_fb_access,
+	.atomic_check = appletbdrm_primary_plane_helper_atomic_check,
+	.atomic_update = appletbdrm_primary_plane_helper_atomic_update,
+	.atomic_disable = appletbdrm_primary_plane_helper_atomic_disable,
+};
+
+static const struct drm_plane_funcs appletbdrm_primary_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.reset = appletbdrm_primary_plane_reset,
+	.atomic_duplicate_state = appletbdrm_primary_plane_duplicate_state,
+	.atomic_destroy_state = appletbdrm_primary_plane_destroy_state,
+	.destroy = drm_plane_cleanup,
+};
+
+static enum drm_mode_status appletbdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
+							  const struct drm_display_mode *mode)
+{
+	struct appletbdrm_device *adev = drm_to_adev(crtc->dev);
+
+	return drm_crtc_helper_mode_valid_fixed(crtc, mode, &adev->mode);
+}
+
+static const struct drm_mode_config_funcs appletbdrm_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static const struct drm_connector_funcs appletbdrm_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.destroy = drm_connector_cleanup,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+};
+
+static const struct drm_connector_helper_funcs appletbdrm_connector_helper_funcs = {
+	.get_modes = appletbdrm_connector_helper_get_modes,
+};
+
+static const struct drm_crtc_helper_funcs appletbdrm_crtc_helper_funcs = {
+	.mode_valid = appletbdrm_crtc_helper_mode_valid,
+};
+
+static const struct drm_crtc_funcs appletbdrm_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_encoder_funcs appletbdrm_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+DEFINE_DRM_GEM_FOPS(appletbdrm_drm_fops);
+
+static const struct drm_driver appletbdrm_drm_driver = {
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	.name			= "appletbdrm",
+	.desc			= "Apple Touch Bar DRM Driver",
+	.major			= 1,
+	.minor			= 0,
+	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+	.fops			= &appletbdrm_drm_fops,
+};
+
+static int appletbdrm_setup_mode_config(struct appletbdrm_device *adev)
+{
+	struct drm_connector *connector = &adev->connector;
+	struct drm_plane *primary_plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_device *drm = &adev->drm;
+	int ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret) {
+		drm_err(drm, "Failed to initialize mode configuration\n");
+		return ret;
+	}
+
+	primary_plane = &adev->primary_plane;
+	ret = drm_universal_plane_init(drm, primary_plane, 0,
+				       &appletbdrm_primary_plane_funcs,
+				       appletbdrm_primary_plane_formats,
+				       ARRAY_SIZE(appletbdrm_primary_plane_formats),
+				       NULL,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		drm_err(drm, "Failed to initialize universal plane object\n");
+		return ret;
+	}
+
+	drm_plane_helper_add(primary_plane, &appletbdrm_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	crtc = &adev->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
+					&appletbdrm_crtc_funcs, NULL);
+	if (ret) {
+		drm_err(drm, "Failed to initialize CRTC object\n");
+		return ret;
+	}
+
+	drm_crtc_helper_add(crtc, &appletbdrm_crtc_helper_funcs);
+
+	encoder = &adev->encoder;
+	ret = drm_encoder_init(drm, encoder, &appletbdrm_encoder_funcs,
+			       DRM_MODE_ENCODER_DAC, NULL);
+	if (ret) {
+		drm_err(drm, "Failed to initialize encoder\n");
+		return ret;
+	}
+
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	/*
+	 * The coordinate system used by the device is different from the
+	 * coordinate system of the framebuffer in that the x and y axes are
+	 * swapped, and that the y axis is inverted; so what the device reports
+	 * as the height is actually the width of the framebuffer and vice
+	 * versa.
+	 */
+	drm->mode_config.max_width = max(adev->height, DRM_SHADOW_PLANE_MAX_WIDTH);
+	drm->mode_config.max_height = max(adev->width, DRM_SHADOW_PLANE_MAX_HEIGHT);
+	drm->mode_config.preferred_depth = APPLETBDRM_BITS_PER_PIXEL;
+	drm->mode_config.funcs = &appletbdrm_mode_config_funcs;
+
+	adev->mode = (struct drm_display_mode) {
+		DRM_MODE_INIT(60, adev->height, adev->width,
+			      DRM_MODE_RES_MM(adev->height, 218),
+			      DRM_MODE_RES_MM(adev->width, 218))
+	};
+
+	ret = drm_connector_init(drm, connector,
+				 &appletbdrm_connector_funcs, DRM_MODE_CONNECTOR_USB);
+	if (ret) {
+		drm_err(drm, "Failed to initialize connector\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(connector, &appletbdrm_connector_helper_funcs);
+
+	ret = drm_connector_set_panel_orientation(connector,
+						  DRM_MODE_PANEL_ORIENTATION_RIGHT_UP);
+	if (ret) {
+		drm_err(drm, "Failed to set panel orientation\n");
+		return ret;
+	}
+
+	connector->display_info.non_desktop = true;
+	ret = drm_object_property_set_value(&connector->base,
+					    drm->mode_config.non_desktop_property, true);
+	if (ret) {
+		drm_err(drm, "Failed to set non-desktop property\n");
+		return ret;
+	}
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+
+	if (ret) {
+		drm_err(drm, "Failed to initialize simple display pipe\n");
+		return ret;
+	}
+
+	drm_mode_config_reset(drm);
+
+	return 0;
+}
+
+static int appletbdrm_probe(struct usb_interface *intf,
+			    const struct usb_device_id *id)
+{
+	struct usb_endpoint_descriptor *bulk_in, *bulk_out;
+	struct device *dev = &intf->dev;
+	struct appletbdrm_device *adev;
+	struct drm_device *drm = NULL;
+	struct device *dma_dev;
+	int ret;
+
+	ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL);
+	if (ret) {
+		drm_err(drm, "appletbdrm: Failed to find bulk endpoints\n");
+		return ret;
+	}
+
+	adev = devm_drm_dev_alloc(dev, &appletbdrm_drm_driver, struct appletbdrm_device, drm);
+	if (IS_ERR(adev))
+		return PTR_ERR(adev);
+
+	adev->in_ep = bulk_in->bEndpointAddress;
+	adev->out_ep = bulk_out->bEndpointAddress;
+
+	drm = &adev->drm;
+
+	usb_set_intfdata(intf, adev);
+
+	dma_dev = usb_intf_get_dma_device(intf);
+	if (dma_dev) {
+		drm_dev_set_dma_dev(drm, dma_dev);
+		put_device(dma_dev);
+	} else {
+		drm_warn(drm, "buffer sharing not supported"); /* not an error */
+	}
+
+	ret = appletbdrm_get_information(adev);
+	if (ret) {
+		drm_err(drm, "Failed to get display information\n");
+		return ret;
+	}
+
+	ret = appletbdrm_signal_readiness(adev);
+	if (ret) {
+		drm_err(drm, "Failed to signal readiness\n");
+		return ret;
+	}
+
+	ret = appletbdrm_setup_mode_config(adev);
+	if (ret) {
+		drm_err(drm, "Failed to setup mode config\n");
+		return ret;
+	}
+
+	ret = drm_dev_register(drm, 0);
+	if (ret) {
+		drm_err(drm, "Failed to register DRM device\n");
+		return ret;
+	}
+
+	ret = appletbdrm_clear_display(adev);
+	if (ret) {
+		drm_err(drm, "Failed to clear display\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void appletbdrm_disconnect(struct usb_interface *intf)
+{
+	struct appletbdrm_device *adev = usb_get_intfdata(intf);
+	struct drm_device *drm = &adev->drm;
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void appletbdrm_shutdown(struct usb_interface *intf)
+{
+	struct appletbdrm_device *adev = usb_get_intfdata(intf);
+
+	/*
+	 * The framebuffer needs to be cleared on shutdown since its content
+	 * persists across boots
+	 */
+	drm_atomic_helper_shutdown(&adev->drm);
+}
+
+static const struct usb_device_id appletbdrm_usb_id_table[] = {
+	{ USB_DEVICE_INTERFACE_CLASS(0x05ac, 0x8302, USB_CLASS_AUDIO_VIDEO) },
+	{}
+};
+MODULE_DEVICE_TABLE(usb, appletbdrm_usb_id_table);
+
+static struct usb_driver appletbdrm_usb_driver = {
+	.name		= "appletbdrm",
+	.probe		= appletbdrm_probe,
+	.disconnect	= appletbdrm_disconnect,
+	.shutdown	= appletbdrm_shutdown,
+	.id_table	= appletbdrm_usb_id_table,
+};
+module_usb_driver(appletbdrm_usb_driver);
+
+MODULE_AUTHOR("Kerem Karabay <kekrby@gmail.com>");
+MODULE_DESCRIPTION("Apple Touch Bar DRM Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/arcpgu.c b/drivers/gpu/drm/tiny/arcpgu.c
new file mode 100644
index 000000000..c93d61ac0
--- /dev/null
+++ b/drivers/gpu/drm/tiny/arcpgu.c
@@ -0,0 +1,435 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
+ */
+
+#include <linux/clk.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_debugfs.h>
+#include <drm/drm_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_module.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+
+#define ARCPGU_REG_CTRL		0x00
+#define ARCPGU_REG_STAT		0x04
+#define ARCPGU_REG_FMT		0x10
+#define ARCPGU_REG_HSYNC	0x14
+#define ARCPGU_REG_VSYNC	0x18
+#define ARCPGU_REG_ACTIVE	0x1c
+#define ARCPGU_REG_BUF0_ADDR	0x40
+#define ARCPGU_REG_STRIDE	0x50
+#define ARCPGU_REG_START_SET	0x84
+
+#define ARCPGU_REG_ID		0x3FC
+
+#define ARCPGU_CTRL_ENABLE_MASK	0x02
+#define ARCPGU_CTRL_VS_POL_MASK	0x1
+#define ARCPGU_CTRL_VS_POL_OFST	0x3
+#define ARCPGU_CTRL_HS_POL_MASK	0x1
+#define ARCPGU_CTRL_HS_POL_OFST	0x4
+#define ARCPGU_MODE_XRGB8888	BIT(2)
+#define ARCPGU_STAT_BUSY_MASK	0x02
+
+struct arcpgu_drm_private {
+	struct drm_device	drm;
+	void __iomem		*regs;
+	struct clk		*clk;
+	struct drm_simple_display_pipe pipe;
+	struct drm_connector	sim_conn;
+};
+
+#define dev_to_arcpgu(x) container_of(x, struct arcpgu_drm_private, drm)
+
+#define pipe_to_arcpgu_priv(x) container_of(x, struct arcpgu_drm_private, pipe)
+
+static inline void arc_pgu_write(struct arcpgu_drm_private *arcpgu,
+				 unsigned int reg, u32 value)
+{
+	iowrite32(value, arcpgu->regs + reg);
+}
+
+static inline u32 arc_pgu_read(struct arcpgu_drm_private *arcpgu,
+			       unsigned int reg)
+{
+	return ioread32(arcpgu->regs + reg);
+}
+
+#define XRES_DEF	640
+#define YRES_DEF	480
+
+#define XRES_MAX	8192
+#define YRES_MAX	8192
+
+static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
+{
+	int count;
+
+	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
+	drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
+	return count;
+}
+
+static const struct drm_connector_helper_funcs
+arcpgu_drm_connector_helper_funcs = {
+	.get_modes = arcpgu_drm_connector_get_modes,
+};
+
+static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int arcpgu_drm_sim_init(struct drm_device *drm, struct drm_connector *connector)
+{
+	drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
+	return drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
+				  DRM_MODE_CONNECTOR_VIRTUAL);
+}
+
+#define ENCODE_PGU_XY(x, y)	((((x) - 1) << 16) | ((y) - 1))
+
+static const u32 arc_pgu_supported_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+};
+
+static void arc_pgu_set_pxl_fmt(struct arcpgu_drm_private *arcpgu)
+{
+	const struct drm_framebuffer *fb = arcpgu->pipe.plane.state->fb;
+	uint32_t pixel_format = fb->format->format;
+	u32 format = DRM_FORMAT_INVALID;
+	int i;
+	u32 reg_ctrl;
+
+	for (i = 0; i < ARRAY_SIZE(arc_pgu_supported_formats); i++) {
+		if (arc_pgu_supported_formats[i] == pixel_format)
+			format = arc_pgu_supported_formats[i];
+	}
+
+	if (WARN_ON(format == DRM_FORMAT_INVALID))
+		return;
+
+	reg_ctrl = arc_pgu_read(arcpgu, ARCPGU_REG_CTRL);
+	if (format == DRM_FORMAT_RGB565)
+		reg_ctrl &= ~ARCPGU_MODE_XRGB8888;
+	else
+		reg_ctrl |= ARCPGU_MODE_XRGB8888;
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL, reg_ctrl);
+}
+
+static enum drm_mode_status arc_pgu_mode_valid(struct drm_simple_display_pipe *pipe,
+					       const struct drm_display_mode *mode)
+{
+	struct arcpgu_drm_private *arcpgu = pipe_to_arcpgu_priv(pipe);
+	long rate, clk_rate = mode->clock * 1000;
+	long diff = clk_rate / 200; /* +-0.5% allowed by HDMI spec */
+
+	rate = clk_round_rate(arcpgu->clk, clk_rate);
+	if ((max(rate, clk_rate) - min(rate, clk_rate) < diff) && (rate > 0))
+		return MODE_OK;
+
+	return MODE_NOCLOCK;
+}
+
+static void arc_pgu_mode_set(struct arcpgu_drm_private *arcpgu)
+{
+	struct drm_display_mode *m = &arcpgu->pipe.crtc.state->adjusted_mode;
+	u32 val;
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_FMT,
+		      ENCODE_PGU_XY(m->crtc_htotal, m->crtc_vtotal));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_HSYNC,
+		      ENCODE_PGU_XY(m->crtc_hsync_start - m->crtc_hdisplay,
+				    m->crtc_hsync_end - m->crtc_hdisplay));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_VSYNC,
+		      ENCODE_PGU_XY(m->crtc_vsync_start - m->crtc_vdisplay,
+				    m->crtc_vsync_end - m->crtc_vdisplay));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_ACTIVE,
+		      ENCODE_PGU_XY(m->crtc_hblank_end - m->crtc_hblank_start,
+				    m->crtc_vblank_end - m->crtc_vblank_start));
+
+	val = arc_pgu_read(arcpgu, ARCPGU_REG_CTRL);
+
+	if (m->flags & DRM_MODE_FLAG_PVSYNC)
+		val |= ARCPGU_CTRL_VS_POL_MASK << ARCPGU_CTRL_VS_POL_OFST;
+	else
+		val &= ~(ARCPGU_CTRL_VS_POL_MASK << ARCPGU_CTRL_VS_POL_OFST);
+
+	if (m->flags & DRM_MODE_FLAG_PHSYNC)
+		val |= ARCPGU_CTRL_HS_POL_MASK << ARCPGU_CTRL_HS_POL_OFST;
+	else
+		val &= ~(ARCPGU_CTRL_HS_POL_MASK << ARCPGU_CTRL_HS_POL_OFST);
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL, val);
+	arc_pgu_write(arcpgu, ARCPGU_REG_STRIDE, 0);
+	arc_pgu_write(arcpgu, ARCPGU_REG_START_SET, 1);
+
+	arc_pgu_set_pxl_fmt(arcpgu);
+
+	clk_set_rate(arcpgu->clk, m->crtc_clock * 1000);
+}
+
+static void arc_pgu_enable(struct drm_simple_display_pipe *pipe,
+			   struct drm_crtc_state *crtc_state,
+			   struct drm_plane_state *plane_state)
+{
+	struct arcpgu_drm_private *arcpgu = pipe_to_arcpgu_priv(pipe);
+
+	arc_pgu_mode_set(arcpgu);
+
+	clk_prepare_enable(arcpgu->clk);
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
+		      arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
+		      ARCPGU_CTRL_ENABLE_MASK);
+}
+
+static void arc_pgu_disable(struct drm_simple_display_pipe *pipe)
+{
+	struct arcpgu_drm_private *arcpgu = pipe_to_arcpgu_priv(pipe);
+
+	clk_disable_unprepare(arcpgu->clk);
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
+			      arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) &
+			      ~ARCPGU_CTRL_ENABLE_MASK);
+}
+
+static void arc_pgu_update(struct drm_simple_display_pipe *pipe,
+			   struct drm_plane_state *state)
+{
+	struct arcpgu_drm_private *arcpgu;
+	struct drm_gem_dma_object *gem;
+
+	if (!pipe->plane.state->fb)
+		return;
+
+	arcpgu = pipe_to_arcpgu_priv(pipe);
+	gem = drm_fb_dma_get_gem_obj(pipe->plane.state->fb, 0);
+	arc_pgu_write(arcpgu, ARCPGU_REG_BUF0_ADDR, gem->dma_addr);
+}
+
+static const struct drm_simple_display_pipe_funcs arc_pgu_pipe_funcs = {
+	.update = arc_pgu_update,
+	.mode_valid = arc_pgu_mode_valid,
+	.enable	= arc_pgu_enable,
+	.disable = arc_pgu_disable,
+};
+
+static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
+	.fb_create  = drm_gem_fb_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(arcpgu_drm_ops);
+
+static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
+{
+	struct platform_device *pdev = to_platform_device(arcpgu->drm.dev);
+	struct device_node *encoder_node __free(device_node) = NULL;
+	struct device_node *endpoint_node = NULL;
+	struct drm_connector *connector = NULL;
+	struct drm_device *drm = &arcpgu->drm;
+	int ret;
+
+	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
+	if (IS_ERR(arcpgu->clk))
+		return PTR_ERR(arcpgu->clk);
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = 1920;
+	drm->mode_config.max_height = 1080;
+	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
+
+	arcpgu->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(arcpgu->regs))
+		return PTR_ERR(arcpgu->regs);
+
+	dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
+		 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
+
+	/* Get the optional framebuffer memory resource */
+	ret = of_reserved_mem_device_init(drm->dev);
+	if (ret && ret != -ENODEV)
+		return ret;
+
+	if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
+		return -ENODEV;
+
+	/*
+	 * There is only one output port inside each device. It is linked with
+	 * encoder endpoint.
+	 */
+	endpoint_node = of_graph_get_endpoint_by_regs(pdev->dev.of_node, 0, -1);
+	if (endpoint_node) {
+		encoder_node = of_graph_get_remote_port_parent(endpoint_node);
+		of_node_put(endpoint_node);
+	} else {
+		connector = &arcpgu->sim_conn;
+		dev_info(drm->dev, "no encoder found. Assumed virtual LCD on simulation platform\n");
+		ret = arcpgu_drm_sim_init(drm, connector);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = drm_simple_display_pipe_init(drm, &arcpgu->pipe, &arc_pgu_pipe_funcs,
+					   arc_pgu_supported_formats,
+					   ARRAY_SIZE(arc_pgu_supported_formats),
+					   NULL, connector);
+	if (ret)
+		return ret;
+
+	if (encoder_node) {
+		/* Locate drm bridge from the hdmi encoder DT node */
+		struct drm_bridge *bridge __free(drm_bridge_put) =
+			of_drm_find_and_get_bridge(encoder_node);
+		if (!bridge)
+			return -EPROBE_DEFER;
+
+		ret = drm_simple_display_pipe_attach_bridge(&arcpgu->pipe, bridge);
+		if (ret)
+			return ret;
+	}
+
+	drm_mode_config_reset(drm);
+	drm_kms_helper_poll_init(drm);
+
+	platform_set_drvdata(pdev, drm);
+	return 0;
+}
+
+static int arcpgu_unload(struct drm_device *drm)
+{
+	drm_kms_helper_poll_fini(drm);
+	drm_atomic_helper_shutdown(drm);
+
+	return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct drm_device *drm = node->minor->dev;
+	struct arcpgu_drm_private *arcpgu = dev_to_arcpgu(drm);
+	unsigned long clkrate = clk_get_rate(arcpgu->clk);
+	unsigned long mode_clock = arcpgu->pipe.crtc.mode.crtc_clock * 1000;
+
+	seq_printf(m, "hw  : %lu\n", clkrate);
+	seq_printf(m, "mode: %lu\n", mode_clock);
+	return 0;
+}
+
+static struct drm_info_list arcpgu_debugfs_list[] = {
+	{ "clocks", arcpgu_show_pxlclock, 0 },
+};
+
+static void arcpgu_debugfs_init(struct drm_minor *minor)
+{
+	drm_debugfs_create_files(arcpgu_debugfs_list,
+				 ARRAY_SIZE(arcpgu_debugfs_list),
+				 minor->debugfs_root, minor);
+}
+#endif
+
+static const struct drm_driver arcpgu_drm_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+	.name = "arcpgu",
+	.desc = "ARC PGU Controller",
+	.major = 1,
+	.minor = 0,
+	.patchlevel = 0,
+	.fops = &arcpgu_drm_ops,
+	DRM_GEM_DMA_DRIVER_OPS,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+#ifdef CONFIG_DEBUG_FS
+	.debugfs_init = arcpgu_debugfs_init,
+#endif
+};
+
+static int arcpgu_probe(struct platform_device *pdev)
+{
+	struct arcpgu_drm_private *arcpgu;
+	int ret;
+
+	arcpgu = devm_drm_dev_alloc(&pdev->dev, &arcpgu_drm_driver,
+				    struct arcpgu_drm_private, drm);
+	if (IS_ERR(arcpgu))
+		return PTR_ERR(arcpgu);
+
+	ret = arcpgu_load(arcpgu);
+	if (ret)
+		return ret;
+
+	ret = drm_dev_register(&arcpgu->drm, 0);
+	if (ret)
+		goto err_unload;
+
+	drm_client_setup_with_fourcc(&arcpgu->drm, DRM_FORMAT_RGB565);
+
+	return 0;
+
+err_unload:
+	arcpgu_unload(&arcpgu->drm);
+
+	return ret;
+}
+
+static void arcpgu_remove(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	drm_dev_unregister(drm);
+	arcpgu_unload(drm);
+}
+
+static const struct of_device_id arcpgu_of_table[] = {
+	{.compatible = "snps,arcpgu"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, arcpgu_of_table);
+
+static struct platform_driver arcpgu_platform_driver = {
+	.probe = arcpgu_probe,
+	.remove = arcpgu_remove,
+	.driver = {
+		   .name = "arcpgu",
+		   .of_match_table = arcpgu_of_table,
+		   },
+};
+
+drm_module_platform_driver(arcpgu_platform_driver);
+
+MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
+MODULE_DESCRIPTION("ARC PGU DRM driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
new file mode 100644
index 000000000..e2d957e51
--- /dev/null
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -0,0 +1,836 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/bug.h>
+#include <linux/aperture.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fbdev_shmem.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_module.h>
+#include <drm/drm_panic.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_vblank_helper.h>
+
+#include <video/vga.h>
+
+/* ---------------------------------------------------------------------- */
+
+#define VBE_DISPI_IOPORT_INDEX           0x01CE
+#define VBE_DISPI_IOPORT_DATA            0x01CF
+
+#define VBE_DISPI_INDEX_ID               0x0
+#define VBE_DISPI_INDEX_XRES             0x1
+#define VBE_DISPI_INDEX_YRES             0x2
+#define VBE_DISPI_INDEX_BPP              0x3
+#define VBE_DISPI_INDEX_ENABLE           0x4
+#define VBE_DISPI_INDEX_BANK             0x5
+#define VBE_DISPI_INDEX_VIRT_WIDTH       0x6
+#define VBE_DISPI_INDEX_VIRT_HEIGHT      0x7
+#define VBE_DISPI_INDEX_X_OFFSET         0x8
+#define VBE_DISPI_INDEX_Y_OFFSET         0x9
+#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
+
+#define VBE_DISPI_ID0                    0xB0C0
+#define VBE_DISPI_ID1                    0xB0C1
+#define VBE_DISPI_ID2                    0xB0C2
+#define VBE_DISPI_ID3                    0xB0C3
+#define VBE_DISPI_ID4                    0xB0C4
+#define VBE_DISPI_ID5                    0xB0C5
+
+#define VBE_DISPI_DISABLED               0x00
+#define VBE_DISPI_ENABLED                0x01
+#define VBE_DISPI_GETCAPS                0x02
+#define VBE_DISPI_8BIT_DAC               0x20
+#define VBE_DISPI_LFB_ENABLED            0x40
+#define VBE_DISPI_NOCLEARMEM             0x80
+
+static int bochs_modeset = -1;
+static int defx = 1024;
+static int defy = 768;
+
+module_param_named(modeset, bochs_modeset, int, 0444);
+MODULE_PARM_DESC(modeset, "enable/disable kernel modesetting");
+
+module_param(defx, int, 0444);
+module_param(defy, int, 0444);
+MODULE_PARM_DESC(defx, "default x resolution");
+MODULE_PARM_DESC(defy, "default y resolution");
+
+/* ---------------------------------------------------------------------- */
+
+enum bochs_types {
+	BOCHS_QEMU_STDVGA,
+	BOCHS_SIMICS,
+	BOCHS_UNKNOWN,
+};
+
+struct bochs_device {
+	struct drm_device dev;
+
+	/* hw */
+	void __iomem   *mmio;
+	int            ioports;
+	void __iomem   *fb_map;
+	unsigned long  fb_base;
+	unsigned long  fb_size;
+	unsigned long  qext_size;
+
+	/* mode */
+	u16 xres;
+	u16 yres;
+	u16 yres_virtual;
+	u32 stride;
+	u32 bpp;
+
+	/* drm */
+	struct drm_plane primary_plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct bochs_device *to_bochs_device(const struct drm_device *dev)
+{
+	return container_of(dev, struct bochs_device, dev);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static __always_inline bool bochs_uses_mmio(struct bochs_device *bochs)
+{
+	return !IS_ENABLED(CONFIG_HAS_IOPORT) || bochs->mmio;
+}
+
+static void bochs_vga_writeb(struct bochs_device *bochs, u16 ioport, u8 val)
+{
+	if (WARN_ON(ioport < 0x3c0 || ioport > 0x3df))
+		return;
+
+	if (bochs_uses_mmio(bochs)) {
+		int offset = ioport - 0x3c0 + 0x400;
+
+		writeb(val, bochs->mmio + offset);
+	} else {
+		outb(val, ioport);
+	}
+}
+
+static u8 bochs_vga_readb(struct bochs_device *bochs, u16 ioport)
+{
+	if (WARN_ON(ioport < 0x3c0 || ioport > 0x3df))
+		return 0xff;
+
+	if (bochs_uses_mmio(bochs)) {
+		int offset = ioport - 0x3c0 + 0x400;
+
+		return readb(bochs->mmio + offset);
+	} else {
+		return inb(ioport);
+	}
+}
+
+static u16 bochs_dispi_read(struct bochs_device *bochs, u16 reg)
+{
+	u16 ret = 0;
+
+	if (bochs_uses_mmio(bochs)) {
+		int offset = 0x500 + (reg << 1);
+
+		ret = readw(bochs->mmio + offset);
+	} else {
+		outw(reg, VBE_DISPI_IOPORT_INDEX);
+		ret = inw(VBE_DISPI_IOPORT_DATA);
+	}
+	return ret;
+}
+
+static void bochs_dispi_write(struct bochs_device *bochs, u16 reg, u16 val)
+{
+	if (bochs_uses_mmio(bochs)) {
+		int offset = 0x500 + (reg << 1);
+
+		writew(val, bochs->mmio + offset);
+	} else {
+		outw(reg, VBE_DISPI_IOPORT_INDEX);
+		outw(val, VBE_DISPI_IOPORT_DATA);
+	}
+}
+
+static void bochs_hw_set_big_endian(struct bochs_device *bochs)
+{
+	if (bochs->qext_size < 8)
+		return;
+
+	writel(0xbebebebe, bochs->mmio + 0x604);
+}
+
+static void bochs_hw_set_little_endian(struct bochs_device *bochs)
+{
+	if (bochs->qext_size < 8)
+		return;
+
+	writel(0x1e1e1e1e, bochs->mmio + 0x604);
+}
+
+#ifdef __BIG_ENDIAN
+#define bochs_hw_set_native_endian(_b) bochs_hw_set_big_endian(_b)
+#else
+#define bochs_hw_set_native_endian(_b) bochs_hw_set_little_endian(_b)
+#endif
+
+static int bochs_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
+{
+	struct bochs_device *bochs = data;
+	size_t i, start = block * EDID_LENGTH;
+
+	if (!bochs->mmio)
+		return -1;
+
+	if (start + len > 0x400 /* vga register offset */)
+		return -1;
+
+	for (i = 0; i < len; i++)
+		buf[i] = readb(bochs->mmio + start + i);
+
+	return 0;
+}
+
+static const struct drm_edid *bochs_hw_read_edid(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct bochs_device *bochs = to_bochs_device(dev);
+	u8 header[8];
+
+	/* check header to detect whenever edid support is enabled in qemu */
+	bochs_get_edid_block(bochs, header, 0, ARRAY_SIZE(header));
+	if (drm_edid_header_is_valid(header) != 8)
+		return NULL;
+
+	drm_dbg(dev, "Found EDID data blob.\n");
+
+	return drm_edid_read_custom(connector, bochs_get_edid_block, bochs);
+}
+
+static int bochs_hw_init(struct bochs_device *bochs)
+{
+	struct drm_device *dev = &bochs->dev;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	unsigned long addr, size, mem, ioaddr, iosize;
+	u16 id;
+
+	if (pdev->resource[2].flags & IORESOURCE_MEM) {
+		ioaddr = pci_resource_start(pdev, 2);
+		iosize = pci_resource_len(pdev, 2);
+		/* mmio bar with vga and bochs registers present */
+		if (!devm_request_mem_region(&pdev->dev, ioaddr, iosize, "bochs-drm")) {
+			DRM_ERROR("Cannot request mmio region\n");
+			return -EBUSY;
+		}
+		bochs->mmio = devm_ioremap(&pdev->dev, ioaddr, iosize);
+		if (bochs->mmio == NULL) {
+			DRM_ERROR("Cannot map mmio region\n");
+			return -ENOMEM;
+		}
+	} else if (IS_ENABLED(CONFIG_HAS_IOPORT)) {
+		ioaddr = VBE_DISPI_IOPORT_INDEX;
+		iosize = 2;
+		if (!devm_request_region(&pdev->dev, ioaddr, iosize, "bochs-drm")) {
+			DRM_ERROR("Cannot request ioports\n");
+			return -EBUSY;
+		}
+		bochs->ioports = 1;
+	} else {
+		drm_err(dev, "I/O ports are not supported\n");
+		return -EIO;
+	}
+
+	id = bochs_dispi_read(bochs, VBE_DISPI_INDEX_ID);
+	mem = bochs_dispi_read(bochs, VBE_DISPI_INDEX_VIDEO_MEMORY_64K)
+		* 64 * 1024;
+	if ((id & 0xfff0) != VBE_DISPI_ID0) {
+		DRM_ERROR("ID mismatch\n");
+		return -ENODEV;
+	}
+
+	if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0)
+		return -ENODEV;
+	addr = pci_resource_start(pdev, 0);
+	size = pci_resource_len(pdev, 0);
+	if (addr == 0)
+		return -ENODEV;
+	if (size != mem) {
+		DRM_ERROR("Size mismatch: pci=%ld, bochs=%ld\n",
+			size, mem);
+		size = min(size, mem);
+	}
+
+	if (!devm_request_mem_region(&pdev->dev, addr, size, "bochs-drm"))
+		DRM_WARN("Cannot request framebuffer, boot fb still active?\n");
+
+	bochs->fb_map = devm_ioremap_wc(&pdev->dev, addr, size);
+	if (bochs->fb_map == NULL) {
+		DRM_ERROR("Cannot map framebuffer\n");
+		return -ENOMEM;
+	}
+	bochs->fb_base = addr;
+	bochs->fb_size = size;
+
+	DRM_INFO("Found bochs VGA, ID 0x%x.\n", id);
+	DRM_INFO("Framebuffer size %ld kB @ 0x%lx, %s @ 0x%lx.\n",
+		 size / 1024, addr,
+		 bochs->ioports ? "ioports" : "mmio",
+		 ioaddr);
+
+	if (bochs->mmio && pdev->revision >= 2) {
+		bochs->qext_size = readl(bochs->mmio + 0x600);
+		if (bochs->qext_size < 4 || bochs->qext_size > iosize) {
+			bochs->qext_size = 0;
+			goto noext;
+		}
+		DRM_DEBUG("Found qemu ext regs, size %ld\n",
+			  bochs->qext_size);
+		bochs_hw_set_native_endian(bochs);
+	}
+
+noext:
+	return 0;
+}
+
+static void bochs_hw_blank(struct bochs_device *bochs, bool blank)
+{
+	DRM_DEBUG_DRIVER("hw_blank %d\n", blank);
+	/* enable color bit (so VGA_IS1_RC access works) */
+	bochs_vga_writeb(bochs, VGA_MIS_W, VGA_MIS_COLOR);
+	/* discard ar_flip_flop */
+	(void)bochs_vga_readb(bochs, VGA_IS1_RC);
+	/* blank or unblank; we need only update index and set 0x20 */
+	bochs_vga_writeb(bochs, VGA_ATT_W, blank ? 0 : 0x20);
+}
+
+static void bochs_hw_setmode(struct bochs_device *bochs, struct drm_display_mode *mode)
+{
+	int idx;
+
+	if (!drm_dev_enter(&bochs->dev, &idx))
+		return;
+
+	bochs->xres = mode->hdisplay;
+	bochs->yres = mode->vdisplay;
+	bochs->bpp = 32;
+	bochs->stride = mode->hdisplay * (bochs->bpp / 8);
+	bochs->yres_virtual = bochs->fb_size / bochs->stride;
+
+	DRM_DEBUG_DRIVER("%dx%d @ %d bpp, vy %d\n",
+			 bochs->xres, bochs->yres, bochs->bpp,
+			 bochs->yres_virtual);
+
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,      0);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP,         bochs->bpp);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES,        bochs->xres);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES,        bochs->yres);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_BANK,        0);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH,  bochs->xres);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_HEIGHT,
+			  bochs->yres_virtual);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET,    0);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET,    0);
+
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,
+			  VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
+
+	drm_dev_exit(idx);
+}
+
+static void bochs_hw_setformat(struct bochs_device *bochs, const struct drm_format_info *format)
+{
+	int idx;
+
+	if (!drm_dev_enter(&bochs->dev, &idx))
+		return;
+
+	DRM_DEBUG_DRIVER("format %c%c%c%c\n",
+			 (format->format >>  0) & 0xff,
+			 (format->format >>  8) & 0xff,
+			 (format->format >> 16) & 0xff,
+			 (format->format >> 24) & 0xff);
+
+	switch (format->format) {
+	case DRM_FORMAT_XRGB8888:
+		bochs_hw_set_little_endian(bochs);
+		break;
+	case DRM_FORMAT_BGRX8888:
+		bochs_hw_set_big_endian(bochs);
+		break;
+	default:
+		/* should not happen */
+		DRM_ERROR("%s: Huh? Got framebuffer format 0x%x",
+			  __func__, format->format);
+		break;
+	}
+
+	drm_dev_exit(idx);
+}
+
+static void bochs_hw_setbase(struct bochs_device *bochs, int x, int y, int stride, u64 addr)
+{
+	unsigned long offset;
+	unsigned int vx, vy, vwidth, idx;
+
+	if (!drm_dev_enter(&bochs->dev, &idx))
+		return;
+
+	bochs->stride = stride;
+	offset = (unsigned long)addr +
+		y * bochs->stride +
+		x * (bochs->bpp / 8);
+	vy = offset / bochs->stride;
+	vx = (offset % bochs->stride) * 8 / bochs->bpp;
+	vwidth = stride * 8 / bochs->bpp;
+
+	DRM_DEBUG_DRIVER("x %d, y %d, addr %llx -> offset %lx, vx %d, vy %d\n",
+			 x, y, addr, offset, vx, vy);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH, vwidth);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, vx);
+	bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, vy);
+
+	drm_dev_exit(idx);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static const uint32_t bochs_primary_plane_formats[] = {
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_BGRX8888,
+};
+
+static int bochs_primary_plane_helper_atomic_check(struct drm_plane *plane,
+						   struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+	int ret;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+	else if (!new_plane_state->visible)
+		return 0;
+
+	return 0;
+}
+
+static void bochs_primary_plane_helper_atomic_update(struct drm_plane *plane,
+						     struct drm_atomic_commit *state)
+{
+	struct drm_device *dev = plane->dev;
+	struct bochs_device *bochs = to_bochs_device(dev);
+	struct drm_plane_state *plane_state = plane->state;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct drm_framebuffer *fb = plane_state->fb;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect damage;
+
+	if (!fb || !bochs->stride)
+		return;
+
+	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		struct iosys_map dst = IOSYS_MAP_INIT_VADDR_IOMEM(bochs->fb_map);
+
+		iosys_map_incr(&dst, drm_fb_clip_offset(fb->pitches[0], fb->format, &damage));
+		drm_fb_memcpy(&dst, fb->pitches, shadow_plane_state->data, fb, &damage);
+	}
+
+	/* Always scanout image at VRAM offset 0 */
+	bochs_hw_setbase(bochs,
+			 plane_state->crtc_x,
+			 plane_state->crtc_y,
+			 fb->pitches[0],
+			 0);
+	bochs_hw_setformat(bochs, fb->format);
+}
+
+static int bochs_primary_plane_helper_get_scanout_buffer(struct drm_plane *plane,
+							 struct drm_scanout_buffer *sb)
+{
+	struct bochs_device *bochs = to_bochs_device(plane->dev);
+	struct iosys_map map = IOSYS_MAP_INIT_VADDR_IOMEM(bochs->fb_map);
+
+	if (plane->state && plane->state->fb) {
+		sb->format = plane->state->fb->format;
+		sb->width = plane->state->fb->width;
+		sb->height = plane->state->fb->height;
+		sb->pitch[0] = plane->state->fb->pitches[0];
+		sb->map[0] = map;
+		return 0;
+	}
+	return -ENODEV;
+}
+
+static const struct drm_plane_helper_funcs bochs_primary_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = bochs_primary_plane_helper_atomic_check,
+	.atomic_update = bochs_primary_plane_helper_atomic_update,
+	.get_scanout_buffer = bochs_primary_plane_helper_get_scanout_buffer,
+};
+
+static const struct drm_plane_funcs bochs_primary_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	DRM_GEM_SHADOW_PLANE_FUNCS
+};
+
+static void bochs_crtc_helper_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct bochs_device *bochs = to_bochs_device(crtc->dev);
+	struct drm_crtc_state *crtc_state = crtc->state;
+
+	bochs_hw_setmode(bochs, &crtc_state->mode);
+}
+
+static int bochs_crtc_helper_atomic_check(struct drm_crtc *crtc,
+					  struct drm_atomic_commit *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+
+	if (!crtc_state->enable)
+		return 0;
+
+	return drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+}
+
+static void bochs_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					    struct drm_atomic_commit *state)
+{
+	struct bochs_device *bochs = to_bochs_device(crtc->dev);
+
+	bochs_hw_blank(bochs, false);
+	drm_crtc_vblank_on(crtc);
+}
+
+static void bochs_crtc_helper_atomic_disable(struct drm_crtc *crtc,
+					     struct drm_atomic_commit *crtc_state)
+{
+	struct bochs_device *bochs = to_bochs_device(crtc->dev);
+
+	drm_crtc_vblank_off(crtc);
+	bochs_hw_blank(bochs, true);
+}
+
+static const struct drm_crtc_helper_funcs bochs_crtc_helper_funcs = {
+	.mode_set_nofb = bochs_crtc_helper_mode_set_nofb,
+	.atomic_check = bochs_crtc_helper_atomic_check,
+	.atomic_flush = drm_crtc_vblank_atomic_flush,
+	.atomic_enable = bochs_crtc_helper_atomic_enable,
+	.atomic_disable = bochs_crtc_helper_atomic_disable,
+};
+
+static const struct drm_crtc_funcs bochs_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	DRM_CRTC_VBLANK_TIMER_FUNCS,
+};
+
+static const struct drm_encoder_funcs bochs_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int bochs_connector_helper_get_modes(struct drm_connector *connector)
+{
+	const struct drm_edid *edid;
+	int count;
+
+	edid = bochs_hw_read_edid(connector);
+
+	if (edid) {
+		drm_edid_connector_update(connector, edid);
+		count = drm_edid_connector_add_modes(connector);
+		drm_edid_free(edid);
+	} else {
+		drm_edid_connector_update(connector, NULL);
+		count = drm_add_modes_noedid(connector, 8192, 8192);
+		drm_set_preferred_mode(connector, defx, defy);
+	}
+
+	return count;
+}
+
+static const struct drm_connector_helper_funcs bochs_connector_helper_funcs = {
+	.get_modes = bochs_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs bochs_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static enum drm_mode_status bochs_mode_config_mode_valid(struct drm_device *dev,
+							 const struct drm_display_mode *mode)
+{
+	struct bochs_device *bochs = to_bochs_device(dev);
+	const struct drm_format_info *format = drm_format_info(DRM_FORMAT_XRGB8888);
+	u64 pitch;
+
+	if (drm_WARN_ON(dev, !format))
+		return MODE_ERROR;
+
+	pitch = drm_format_info_min_pitch(format, 0, mode->hdisplay);
+	if (!pitch)
+		return MODE_BAD_WIDTH;
+	if (mode->vdisplay > DIV_ROUND_DOWN_ULL(bochs->fb_size, pitch))
+		return MODE_MEM;
+
+	return MODE_OK;
+}
+
+static const struct drm_mode_config_funcs bochs_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.mode_valid = bochs_mode_config_mode_valid,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int bochs_kms_init(struct bochs_device *bochs)
+{
+	struct drm_device *dev = &bochs->dev;
+	struct drm_plane *primary_plane;
+	struct drm_crtc *crtc;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
+	int ret;
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
+	dev->mode_config.max_width = 8192;
+	dev->mode_config.max_height = 8192;
+
+	dev->mode_config.preferred_depth = 24;
+	dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
+
+	dev->mode_config.funcs = &bochs_mode_config_funcs;
+
+	primary_plane = &bochs->primary_plane;
+	ret = drm_universal_plane_init(dev, primary_plane, 0,
+				       &bochs_primary_plane_funcs,
+				       bochs_primary_plane_formats,
+				       ARRAY_SIZE(bochs_primary_plane_formats),
+				       NULL,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(primary_plane, &bochs_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	crtc = &bochs->crtc;
+	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+					&bochs_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &bochs_crtc_helper_funcs);
+
+	encoder = &bochs->encoder;
+	ret = drm_encoder_init(dev, encoder, &bochs_encoder_funcs,
+			       DRM_MODE_ENCODER_VIRTUAL, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &bochs->connector;
+	ret = drm_connector_init(dev, connector, &bochs_connector_funcs,
+				 DRM_MODE_CONNECTOR_VIRTUAL);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &bochs_connector_helper_funcs);
+	drm_connector_attach_edid_property(connector);
+	drm_connector_attach_encoder(connector, encoder);
+
+	ret = drm_vblank_init(dev, 1);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(dev);
+
+	return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+/* drm interface                                                          */
+
+static int bochs_load(struct bochs_device *bochs)
+{
+	int ret;
+
+	ret = bochs_hw_init(bochs);
+	if (ret)
+		return ret;
+
+	ret = bochs_kms_init(bochs);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+DEFINE_DRM_GEM_FOPS(bochs_fops);
+
+static const struct drm_driver bochs_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &bochs_fops,
+	.name			= "bochs-drm",
+	.desc			= "bochs dispi vga interface (qemu stdvga)",
+	.major			= 1,
+	.minor			= 0,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	DRM_FBDEV_SHMEM_DRIVER_OPS,
+};
+
+/* ---------------------------------------------------------------------- */
+/* pm interface                                                           */
+
+#ifdef CONFIG_PM_SLEEP
+static int bochs_pm_suspend(struct device *dev)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_suspend(drm_dev);
+}
+
+static int bochs_pm_resume(struct device *dev)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_resume(drm_dev);
+}
+#endif
+
+static const struct dev_pm_ops bochs_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(bochs_pm_suspend,
+				bochs_pm_resume)
+};
+
+/* ---------------------------------------------------------------------- */
+/* pci interface                                                          */
+
+static int bochs_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct bochs_device *bochs;
+	struct drm_device *dev;
+	int ret;
+
+	ret = aperture_remove_conflicting_pci_devices(pdev, bochs_driver.name);
+	if (ret)
+		return ret;
+
+	bochs = devm_drm_dev_alloc(&pdev->dev, &bochs_driver, struct bochs_device, dev);
+	if (IS_ERR(bochs))
+		return PTR_ERR(bochs);
+	dev = &bochs->dev;
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	pci_set_drvdata(pdev, dev);
+
+	ret = bochs_load(bochs);
+	if (ret)
+		return ret;
+
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		return ret;
+
+	drm_client_setup(dev, NULL);
+
+	return ret;
+}
+
+static void bochs_pci_remove(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	drm_dev_unplug(dev);
+	drm_atomic_helper_shutdown(dev);
+}
+
+static void bochs_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
+static const struct pci_device_id bochs_pci_tbl[] = {
+	{
+		.vendor      = 0x1234,
+		.device      = 0x1111,
+		.subvendor   = PCI_SUBVENDOR_ID_REDHAT_QUMRANET,
+		.subdevice   = PCI_SUBDEVICE_ID_QEMU,
+		.driver_data = BOCHS_QEMU_STDVGA,
+	},
+	{
+		.vendor      = 0x1234,
+		.device      = 0x1111,
+		.subvendor   = PCI_ANY_ID,
+		.subdevice   = PCI_ANY_ID,
+		.driver_data = BOCHS_UNKNOWN,
+	},
+	{
+		.vendor      = 0x4321,
+		.device      = 0x1111,
+		.subvendor   = PCI_ANY_ID,
+		.subdevice   = PCI_ANY_ID,
+		.driver_data = BOCHS_SIMICS,
+	},
+	{ /* end of list */ }
+};
+
+static struct pci_driver bochs_pci_driver = {
+	.name =		"bochs-drm",
+	.id_table =	bochs_pci_tbl,
+	.probe =	bochs_pci_probe,
+	.remove =	bochs_pci_remove,
+	.shutdown =	bochs_pci_shutdown,
+	.driver.pm =    &bochs_pm_ops,
+};
+
+/* ---------------------------------------------------------------------- */
+/* module init/exit                                                       */
+
+drm_module_pci_driver_if_modeset(bochs_pci_driver, bochs_modeset);
+
+MODULE_DEVICE_TABLE(pci, bochs_pci_tbl);
+MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
+MODULE_DESCRIPTION("DRM Support for bochs dispi vga interface (qemu stdvga)");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/cirrus-qemu.c b/drivers/gpu/drm/tiny/cirrus-qemu.c
new file mode 100644
index 000000000..075221b43
--- /dev/null
+++ b/drivers/gpu/drm/tiny/cirrus-qemu.c
@@ -0,0 +1,675 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2012-2019 Red Hat
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License version 2. See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * Authors: Matthew Garrett
+ *	    Dave Airlie
+ *	    Gerd Hoffmann
+ *
+ * Portions of this code derived from cirrusfb.c:
+ * drivers/video/cirrusfb.c - driver for Cirrus Logic chipsets
+ *
+ * Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
+ */
+
+#include <linux/aperture.h>
+#include <linux/iosys-map.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <video/cirrus.h>
+#include <video/vga.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fbdev_shmem.h>
+#include <drm/drm_file.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_module.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_vblank_helper.h>
+
+#define DRIVER_NAME "cirrus-qemu"
+#define DRIVER_DESC "qemu cirrus vga"
+#define DRIVER_MAJOR 2
+#define DRIVER_MINOR 0
+
+#define CIRRUS_MAX_PITCH (0x1FF << 3)      /* (4096 - 1) & ~111b bytes */
+#define CIRRUS_VRAM_SIZE (4 * 1024 * 1024) /* 4 MB */
+
+struct cirrus_device {
+	struct drm_device	       dev;
+
+	/* modesetting pipeline */
+	struct drm_plane	       primary_plane;
+	struct drm_crtc		       crtc;
+	struct drm_encoder	       encoder;
+	struct drm_connector	       connector;
+
+	/* HW resources */
+	void __iomem		       *vram;
+	void __iomem		       *mmio;
+};
+
+#define to_cirrus(_dev) container_of(_dev, struct cirrus_device, dev)
+
+/* ------------------------------------------------------------------ */
+/*
+ * The meat of this driver. The core passes us a mode and we have to program
+ * it. The modesetting here is the bare minimum required to satisfy the qemu
+ * emulation of this hardware, and running this against a real device is
+ * likely to result in an inadequately programmed mode. We've already had
+ * the opportunity to modify the mode, so whatever we receive here should
+ * be something that can be correctly programmed and displayed
+ */
+
+#define SEQ_INDEX 4
+#define SEQ_DATA 5
+
+static u8 rreg_seq(struct cirrus_device *cirrus, u8 reg)
+{
+	iowrite8(reg, cirrus->mmio + SEQ_INDEX);
+	return ioread8(cirrus->mmio + SEQ_DATA);
+}
+
+static void wreg_seq(struct cirrus_device *cirrus, u8 reg, u8 val)
+{
+	iowrite8(reg, cirrus->mmio + SEQ_INDEX);
+	iowrite8(val, cirrus->mmio + SEQ_DATA);
+}
+
+#define CRT_INDEX 0x14
+#define CRT_DATA 0x15
+
+static u8 rreg_crt(struct cirrus_device *cirrus, u8 reg)
+{
+	iowrite8(reg, cirrus->mmio + CRT_INDEX);
+	return ioread8(cirrus->mmio + CRT_DATA);
+}
+
+static void wreg_crt(struct cirrus_device *cirrus, u8 reg, u8 val)
+{
+	iowrite8(reg, cirrus->mmio + CRT_INDEX);
+	iowrite8(val, cirrus->mmio + CRT_DATA);
+}
+
+#define GFX_INDEX 0xe
+#define GFX_DATA 0xf
+
+static void wreg_gfx(struct cirrus_device *cirrus, u8 reg, u8 val)
+{
+	iowrite8(reg, cirrus->mmio + GFX_INDEX);
+	iowrite8(val, cirrus->mmio + GFX_DATA);
+}
+
+#define VGA_DAC_MASK  0x06
+
+static void wreg_hdr(struct cirrus_device *cirrus, u8 val)
+{
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	iowrite8(val, cirrus->mmio + VGA_DAC_MASK);
+}
+
+static void cirrus_set_start_address(struct cirrus_device *cirrus, u32 offset)
+{
+	u32 addr;
+	u8 tmp;
+
+	addr = offset >> 2;
+	wreg_crt(cirrus, 0x0c, (u8)((addr >> 8) & 0xff));
+	wreg_crt(cirrus, 0x0d, (u8)(addr & 0xff));
+
+	tmp = rreg_crt(cirrus, 0x1b);
+	tmp &= 0xf2;
+	tmp |= (addr >> 16) & 0x01;
+	tmp |= (addr >> 15) & 0x0c;
+	wreg_crt(cirrus, 0x1b, tmp);
+
+	tmp = rreg_crt(cirrus, 0x1d);
+	tmp &= 0x7f;
+	tmp |= (addr >> 12) & 0x80;
+	wreg_crt(cirrus, 0x1d, tmp);
+}
+
+static void cirrus_mode_set(struct cirrus_device *cirrus,
+			    struct drm_display_mode *mode)
+{
+	int hsyncstart, hsyncend, htotal, hdispend;
+	int vtotal, vdispend;
+	int tmp;
+
+	htotal = mode->htotal / 8;
+	hsyncend = mode->hsync_end / 8;
+	hsyncstart = mode->hsync_start / 8;
+	hdispend = mode->hdisplay / 8;
+
+	vtotal = mode->vtotal;
+	vdispend = mode->vdisplay;
+
+	vdispend -= 1;
+	vtotal -= 2;
+
+	htotal -= 5;
+	hdispend -= 1;
+	hsyncstart += 1;
+	hsyncend += 1;
+
+	wreg_crt(cirrus, VGA_CRTC_V_SYNC_END, 0x20);
+	wreg_crt(cirrus, VGA_CRTC_H_TOTAL, htotal);
+	wreg_crt(cirrus, VGA_CRTC_H_DISP, hdispend);
+	wreg_crt(cirrus, VGA_CRTC_H_SYNC_START, hsyncstart);
+	wreg_crt(cirrus, VGA_CRTC_H_SYNC_END, hsyncend);
+	wreg_crt(cirrus, VGA_CRTC_V_TOTAL, vtotal & 0xff);
+	wreg_crt(cirrus, VGA_CRTC_V_DISP_END, vdispend & 0xff);
+
+	tmp = 0x40;
+	if ((vdispend + 1) & 512)
+		tmp |= 0x20;
+	wreg_crt(cirrus, VGA_CRTC_MAX_SCAN, tmp);
+
+	/*
+	 * Overflow bits for values that don't fit in the standard registers
+	 */
+	tmp = 0x10;
+	if (vtotal & 0x100)
+		tmp |= 0x01;
+	if (vdispend & 0x100)
+		tmp |= 0x02;
+	if ((vdispend + 1) & 0x100)
+		tmp |= 0x08;
+	if (vtotal & 0x200)
+		tmp |= 0x20;
+	if (vdispend & 0x200)
+		tmp |= 0x40;
+	wreg_crt(cirrus, VGA_CRTC_OVERFLOW, tmp);
+
+	tmp = 0;
+
+	/* More overflow bits */
+
+	if ((htotal + 5) & 0x40)
+		tmp |= 0x10;
+	if ((htotal + 5) & 0x80)
+		tmp |= 0x20;
+	if (vtotal & 0x100)
+		tmp |= 0x40;
+	if (vtotal & 0x200)
+		tmp |= 0x80;
+
+	wreg_crt(cirrus, CL_CRT1A, tmp);
+
+	/* Disable Hercules/CGA compatibility */
+	wreg_crt(cirrus, VGA_CRTC_MODE, 0x03);
+}
+
+static void cirrus_format_set(struct cirrus_device *cirrus,
+			      const struct drm_format_info *format)
+{
+	u8 sr07, hdr;
+
+	sr07 = rreg_seq(cirrus, 0x07);
+	sr07 &= 0xe0;
+
+	switch (format->format) {
+	case DRM_FORMAT_C8:
+		sr07 |= 0x11;
+		hdr = 0x00;
+		break;
+	case DRM_FORMAT_RGB565:
+		sr07 |= 0x17;
+		hdr = 0xc1;
+		break;
+	case DRM_FORMAT_RGB888:
+		sr07 |= 0x15;
+		hdr = 0xc5;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		sr07 |= 0x19;
+		hdr = 0xc5;
+		break;
+	default:
+		return;
+	}
+
+	wreg_seq(cirrus, 0x7, sr07);
+
+	/* Enable high-colour modes */
+	wreg_gfx(cirrus, VGA_GFX_MODE, 0x40);
+
+	/* And set graphics mode */
+	wreg_gfx(cirrus, VGA_GFX_MISC, 0x01);
+
+	wreg_hdr(cirrus, hdr);
+}
+
+static void cirrus_pitch_set(struct cirrus_device *cirrus, unsigned int pitch)
+{
+	u8 cr13, cr1b;
+
+	/* Program the pitch */
+	cr13 = pitch / 8;
+	wreg_crt(cirrus, VGA_CRTC_OFFSET, cr13);
+
+	/* Enable extended blanking and pitch bits, and enable full memory */
+	cr1b = 0x22;
+	cr1b |= (pitch >> 7) & 0x10;
+	wreg_crt(cirrus, 0x1b, cr1b);
+
+	cirrus_set_start_address(cirrus, 0);
+}
+
+/* ------------------------------------------------------------------ */
+/* cirrus display pipe						      */
+
+static const uint32_t cirrus_primary_plane_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_XRGB8888,
+};
+
+static const uint64_t cirrus_primary_plane_format_modifiers[] = {
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
+static int cirrus_primary_plane_helper_atomic_check(struct drm_plane *plane,
+						    struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_framebuffer *fb = new_plane_state->fb;
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+	int ret;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+	else if (!new_plane_state->visible)
+		return 0;
+
+	/* validate size constraints */
+	if (fb->pitches[0] > CIRRUS_MAX_PITCH)
+		return -EINVAL;
+	else if (fb->pitches[0] > CIRRUS_VRAM_SIZE / fb->height)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void cirrus_primary_plane_helper_atomic_update(struct drm_plane *plane,
+						      struct drm_atomic_commit *state)
+{
+	struct cirrus_device *cirrus = to_cirrus(plane->dev);
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct drm_framebuffer *fb = plane_state->fb;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_framebuffer *old_fb = old_plane_state->fb;
+	struct iosys_map vaddr = IOSYS_MAP_INIT_VADDR_IOMEM(cirrus->vram);
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect damage;
+	int idx;
+
+	if (!fb)
+		return;
+
+	if (!drm_dev_enter(&cirrus->dev, &idx))
+		return;
+
+	if (!old_fb || old_fb->format != fb->format)
+		cirrus_format_set(cirrus, fb->format);
+	if (!old_fb || old_fb->pitches[0] != fb->pitches[0])
+		cirrus_pitch_set(cirrus, fb->pitches[0]);
+
+	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		unsigned int offset = drm_fb_clip_offset(fb->pitches[0], fb->format, &damage);
+		struct iosys_map dst = IOSYS_MAP_INIT_OFFSET(&vaddr, offset);
+
+		drm_fb_memcpy(&dst, fb->pitches, shadow_plane_state->data, fb, &damage);
+	}
+
+	drm_dev_exit(idx);
+}
+
+static const struct drm_plane_helper_funcs cirrus_primary_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = cirrus_primary_plane_helper_atomic_check,
+	.atomic_update = cirrus_primary_plane_helper_atomic_update,
+};
+
+static const struct drm_plane_funcs cirrus_primary_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	DRM_GEM_SHADOW_PLANE_FUNCS,
+};
+
+static int cirrus_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_commit *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	int ret;
+
+	if (!crtc_state->enable)
+		return 0;
+
+	ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void cirrus_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					     struct drm_atomic_commit *state)
+{
+	struct cirrus_device *cirrus = to_cirrus(crtc->dev);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	int idx;
+
+	if (!drm_dev_enter(&cirrus->dev, &idx))
+		return;
+
+	cirrus_mode_set(cirrus, &crtc_state->mode);
+
+#ifdef CONFIG_HAS_IOPORT
+	/* Unblank (needed on S3 resume, vgabios doesn't do it then) */
+	outb(VGA_AR_ENABLE_DISPLAY, VGA_ATT_W);
+#endif
+
+	drm_dev_exit(idx);
+
+	drm_crtc_vblank_on(crtc);
+}
+
+static const struct drm_crtc_helper_funcs cirrus_crtc_helper_funcs = {
+	.atomic_check = cirrus_crtc_helper_atomic_check,
+	.atomic_flush = drm_crtc_vblank_atomic_flush,
+	.atomic_enable = cirrus_crtc_helper_atomic_enable,
+	.atomic_disable = drm_crtc_vblank_atomic_disable,
+};
+
+static const struct drm_crtc_funcs cirrus_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	DRM_CRTC_VBLANK_TIMER_FUNCS,
+};
+
+static const struct drm_encoder_funcs cirrus_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int cirrus_connector_helper_get_modes(struct drm_connector *connector)
+{
+	int count;
+
+	count = drm_add_modes_noedid(connector,
+				     connector->dev->mode_config.max_width,
+				     connector->dev->mode_config.max_height);
+	drm_set_preferred_mode(connector, 1024, 768);
+	return count;
+}
+
+static const struct drm_connector_helper_funcs cirrus_connector_helper_funcs = {
+	.get_modes = cirrus_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs cirrus_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int cirrus_pipe_init(struct cirrus_device *cirrus)
+{
+	struct drm_device *dev = &cirrus->dev;
+	struct drm_plane *primary_plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	int ret;
+
+	primary_plane = &cirrus->primary_plane;
+	ret = drm_universal_plane_init(dev, primary_plane, 0,
+				       &cirrus_primary_plane_funcs,
+				       cirrus_primary_plane_formats,
+				       ARRAY_SIZE(cirrus_primary_plane_formats),
+				       cirrus_primary_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(primary_plane, &cirrus_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	crtc = &cirrus->crtc;
+	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+					&cirrus_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &cirrus_crtc_helper_funcs);
+
+	encoder = &cirrus->encoder;
+	ret = drm_encoder_init(dev, encoder, &cirrus_encoder_funcs,
+			       DRM_MODE_ENCODER_VIRTUAL, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &cirrus->connector;
+	ret = drm_connector_init(dev, connector, &cirrus_connector_funcs,
+				 DRM_MODE_CONNECTOR_VIRTUAL);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &cirrus_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	ret = drm_vblank_init(dev, 1);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+/* cirrus framebuffers & mode config				      */
+
+static enum drm_mode_status cirrus_mode_config_mode_valid(struct drm_device *dev,
+							  const struct drm_display_mode *mode)
+{
+	const struct drm_format_info *format = drm_format_info(DRM_FORMAT_XRGB8888);
+	u64 pitch;
+
+	if (drm_WARN_ON_ONCE(dev, !format))
+		return MODE_ERROR; /* driver bug */
+
+	pitch = drm_format_info_min_pitch(format, 0, mode->hdisplay);
+	if (!pitch)
+		return MODE_BAD_WIDTH;
+	if (pitch > CIRRUS_MAX_PITCH)
+		return MODE_BAD_WIDTH; /* maximum programmable pitch */
+	if (pitch > CIRRUS_VRAM_SIZE / mode->vdisplay)
+		return MODE_MEM;
+
+	return MODE_OK;
+}
+
+static const struct drm_mode_config_funcs cirrus_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.mode_valid = cirrus_mode_config_mode_valid,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int cirrus_mode_config_init(struct cirrus_device *cirrus)
+{
+	struct drm_device *dev = &cirrus->dev;
+	int ret;
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
+	dev->mode_config.min_width = 0;
+	dev->mode_config.min_height = 0;
+	dev->mode_config.max_width = CIRRUS_MAX_PITCH / 2;
+	dev->mode_config.max_height = 1024;
+	dev->mode_config.preferred_depth = 16;
+	dev->mode_config.prefer_shadow = 0;
+	dev->mode_config.funcs = &cirrus_mode_config_funcs;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+
+DEFINE_DRM_GEM_FOPS(cirrus_fops);
+
+static const struct drm_driver cirrus_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+
+	.name		 = DRIVER_NAME,
+	.desc		 = DRIVER_DESC,
+	.major		 = DRIVER_MAJOR,
+	.minor		 = DRIVER_MINOR,
+
+	.fops		 = &cirrus_fops,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	DRM_FBDEV_SHMEM_DRIVER_OPS,
+};
+
+static int cirrus_pci_probe(struct pci_dev *pdev,
+			    const struct pci_device_id *ent)
+{
+	struct drm_device *dev;
+	struct cirrus_device *cirrus;
+	int ret;
+
+	ret = aperture_remove_conflicting_pci_devices(pdev, cirrus_driver.name);
+	if (ret)
+		return ret;
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	ret = pcim_request_all_regions(pdev, DRIVER_NAME);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
+	cirrus = devm_drm_dev_alloc(&pdev->dev, &cirrus_driver,
+				    struct cirrus_device, dev);
+	if (IS_ERR(cirrus))
+		return PTR_ERR(cirrus);
+
+	dev = &cirrus->dev;
+
+	cirrus->vram = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0),
+				    pci_resource_len(pdev, 0));
+	if (cirrus->vram == NULL)
+		return -ENOMEM;
+
+	cirrus->mmio = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 1),
+				    pci_resource_len(pdev, 1));
+	if (cirrus->mmio == NULL)
+		return -ENOMEM;
+
+	ret = cirrus_mode_config_init(cirrus);
+	if (ret)
+		return ret;
+
+	ret = cirrus_pipe_init(cirrus);
+	if (ret < 0)
+		return ret;
+
+	drm_mode_config_reset(dev);
+
+	pci_set_drvdata(pdev, dev);
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		return ret;
+
+	drm_client_setup(dev, NULL);
+	return 0;
+}
+
+static void cirrus_pci_remove(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	drm_dev_unplug(dev);
+	drm_atomic_helper_shutdown(dev);
+}
+
+static void cirrus_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
+static const struct pci_device_id pciidlist[] = {
+	{
+		.vendor    = PCI_VENDOR_ID_CIRRUS,
+		.device    = PCI_DEVICE_ID_CIRRUS_5446,
+		/* only bind to the cirrus chip in qemu */
+		.subvendor = PCI_SUBVENDOR_ID_REDHAT_QUMRANET,
+		.subdevice = PCI_SUBDEVICE_ID_QEMU,
+	}, {
+		.vendor    = PCI_VENDOR_ID_CIRRUS,
+		.device    = PCI_DEVICE_ID_CIRRUS_5446,
+		.subvendor = PCI_VENDOR_ID_XEN,
+		.subdevice = 0x0001,
+	},
+	{ /* end if list */ }
+};
+
+static struct pci_driver cirrus_pci_driver = {
+	.name = DRIVER_NAME,
+	.id_table = pciidlist,
+	.probe = cirrus_pci_probe,
+	.remove = cirrus_pci_remove,
+	.shutdown = cirrus_pci_shutdown,
+};
+
+drm_module_pci_driver(cirrus_pci_driver)
+
+MODULE_DEVICE_TABLE(pci, pciidlist);
+MODULE_DESCRIPTION("Cirrus driver for QEMU emulated device");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c
new file mode 100644
index 000000000..4ad074337
--- /dev/null
+++ b/drivers/gpu/drm/tiny/gm12u320.c
@@ -0,0 +1,748 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/usb.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fbdev_shmem.h>
+#include <drm/drm_file.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+static bool eco_mode;
+module_param(eco_mode, bool, 0644);
+MODULE_PARM_DESC(eco_mode, "Turn on Eco mode (less bright, more silent)");
+
+#define DRIVER_NAME		"gm12u320"
+#define DRIVER_DESC		"Grain Media GM12U320 USB projector display"
+#define DRIVER_MAJOR		1
+#define DRIVER_MINOR		0
+
+/*
+ * The DLP has an actual width of 854 pixels, but that is not a multiple
+ * of 8, breaking things left and right, so we export a width of 848.
+ */
+#define GM12U320_USER_WIDTH		848
+#define GM12U320_REAL_WIDTH		854
+#define GM12U320_HEIGHT			480
+
+#define GM12U320_BLOCK_COUNT		20
+
+#define GM12U320_ERR(fmt, ...) \
+	DRM_DEV_ERROR(gm12u320->dev.dev, fmt, ##__VA_ARGS__)
+
+#define MISC_RCV_EPT			1
+#define DATA_RCV_EPT			2
+#define DATA_SND_EPT			3
+#define MISC_SND_EPT			4
+
+#define DATA_BLOCK_HEADER_SIZE		84
+#define DATA_BLOCK_CONTENT_SIZE		64512
+#define DATA_BLOCK_FOOTER_SIZE		20
+#define DATA_BLOCK_SIZE			(DATA_BLOCK_HEADER_SIZE + \
+					 DATA_BLOCK_CONTENT_SIZE + \
+					 DATA_BLOCK_FOOTER_SIZE)
+#define DATA_LAST_BLOCK_CONTENT_SIZE	4032
+#define DATA_LAST_BLOCK_SIZE		(DATA_BLOCK_HEADER_SIZE + \
+					 DATA_LAST_BLOCK_CONTENT_SIZE + \
+					 DATA_BLOCK_FOOTER_SIZE)
+
+#define CMD_SIZE			31
+#define READ_STATUS_SIZE		13
+#define MISC_VALUE_SIZE			4
+
+#define CMD_TIMEOUT			200
+#define DATA_TIMEOUT			1000
+#define IDLE_TIMEOUT			2000
+#define FIRST_FRAME_TIMEOUT		2000
+
+#define MISC_REQ_GET_SET_ECO_A		0xff
+#define MISC_REQ_GET_SET_ECO_B		0x35
+/* Windows driver does once every second, with arg d = 1, other args 0 */
+#define MISC_REQ_UNKNOWN1_A		0xff
+#define MISC_REQ_UNKNOWN1_B		0x38
+/* Windows driver does this on init, with arg a, b = 0, c = 0xa0, d = 4 */
+#define MISC_REQ_UNKNOWN2_A		0xa5
+#define MISC_REQ_UNKNOWN2_B		0x00
+
+struct gm12u320_device {
+	struct drm_device	         dev;
+	struct drm_simple_display_pipe   pipe;
+	struct drm_connector	         conn;
+	unsigned char                   *cmd_buf;
+	unsigned char                   *data_buf[GM12U320_BLOCK_COUNT];
+	struct {
+		struct delayed_work       work;
+		struct mutex             lock;
+		struct drm_framebuffer  *fb;
+		struct drm_rect          rect;
+		int frame;
+		int draw_status_timeout;
+		struct iosys_map src_map;
+	} fb_update;
+};
+
+#define to_gm12u320(__dev) container_of(__dev, struct gm12u320_device, dev)
+
+static const char cmd_data[CMD_SIZE] = {
+	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
+	0x68, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x10, 0xff,
+	0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x80, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char cmd_draw[CMD_SIZE] = {
+	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xfe,
+	0x00, 0x00, 0x00, 0xc0, 0xd1, 0x05, 0x00, 0x40,
+	0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char cmd_misc[CMD_SIZE] = {
+	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
+	0x04, 0x00, 0x00, 0x00, 0x80, 0x01, 0x10, 0xfd,
+	0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char data_block_header[DATA_BLOCK_HEADER_SIZE] = {
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x04, 0x15, 0x00, 0x00, 0xfc, 0x00, 0x00,
+	0x01, 0x00, 0x00, 0xdb
+};
+
+static const char data_last_block_header[DATA_BLOCK_HEADER_SIZE] = {
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x2a, 0x00, 0x20, 0x00, 0xc0, 0x0f, 0x00, 0x00,
+	0x01, 0x00, 0x00, 0xd7
+};
+
+static const char data_block_footer[DATA_BLOCK_FOOTER_SIZE] = {
+	0xfb, 0x14, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x80, 0x00, 0x00, 0x4f
+};
+
+static inline struct usb_device *gm12u320_to_usb_device(struct gm12u320_device *gm12u320)
+{
+	return interface_to_usbdev(to_usb_interface(gm12u320->dev.dev));
+}
+
+static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
+{
+	int i, block_size;
+	const char *hdr;
+
+	gm12u320->cmd_buf = drmm_kmalloc(&gm12u320->dev, CMD_SIZE, GFP_KERNEL);
+	if (!gm12u320->cmd_buf)
+		return -ENOMEM;
+
+	for (i = 0; i < GM12U320_BLOCK_COUNT; i++) {
+		if (i == GM12U320_BLOCK_COUNT - 1) {
+			block_size = DATA_LAST_BLOCK_SIZE;
+			hdr = data_last_block_header;
+		} else {
+			block_size = DATA_BLOCK_SIZE;
+			hdr = data_block_header;
+		}
+
+		gm12u320->data_buf[i] = drmm_kzalloc(&gm12u320->dev,
+						     block_size, GFP_KERNEL);
+		if (!gm12u320->data_buf[i])
+			return -ENOMEM;
+
+		memcpy(gm12u320->data_buf[i], hdr, DATA_BLOCK_HEADER_SIZE);
+		memcpy(gm12u320->data_buf[i] +
+				(block_size - DATA_BLOCK_FOOTER_SIZE),
+		       data_block_footer, DATA_BLOCK_FOOTER_SIZE);
+	}
+
+	return 0;
+}
+
+static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
+				 u8 req_a, u8 req_b,
+				 u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
+{
+	struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
+	int ret, len;
+
+	memcpy(gm12u320->cmd_buf, &cmd_misc, CMD_SIZE);
+	gm12u320->cmd_buf[20] = req_a;
+	gm12u320->cmd_buf[21] = req_b;
+	gm12u320->cmd_buf[22] = arg_a;
+	gm12u320->cmd_buf[23] = arg_b;
+	gm12u320->cmd_buf[24] = arg_c;
+	gm12u320->cmd_buf[25] = arg_d;
+
+	/* Send request */
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, MISC_SND_EPT),
+			   gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
+	if (ret || len != CMD_SIZE) {
+		GM12U320_ERR("Misc. req. error %d\n", ret);
+		return -EIO;
+	}
+
+	/* Read value */
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
+			   gm12u320->cmd_buf, MISC_VALUE_SIZE, &len,
+			   DATA_TIMEOUT);
+	if (ret || len != MISC_VALUE_SIZE) {
+		GM12U320_ERR("Misc. value error %d\n", ret);
+		return -EIO;
+	}
+	/* cmd_buf[0] now contains the read value, which we don't use */
+
+	/* Read status */
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
+			   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+			   CMD_TIMEOUT);
+	if (ret || len != READ_STATUS_SIZE) {
+		GM12U320_ERR("Misc. status error %d\n", ret);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)
+{
+	while (len--) {
+		*dst++ = *src++;
+		*dst++ = *src++;
+		*dst++ = *src++;
+		src++;
+	}
+}
+
+static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
+{
+	int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
+	struct drm_framebuffer *fb;
+	void *vaddr;
+	u8 *src;
+
+	mutex_lock(&gm12u320->fb_update.lock);
+
+	if (!gm12u320->fb_update.fb)
+		goto unlock;
+
+	fb = gm12u320->fb_update.fb;
+	x1 = gm12u320->fb_update.rect.x1;
+	x2 = gm12u320->fb_update.rect.x2;
+	y1 = gm12u320->fb_update.rect.y1;
+	y2 = gm12u320->fb_update.rect.y2;
+	vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction properly */
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret) {
+		GM12U320_ERR("drm_gem_fb_begin_cpu_access err: %d\n", ret);
+		goto put_fb;
+	}
+
+	src = vaddr + y1 * fb->pitches[0] + x1 * 4;
+
+	x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
+	x2 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
+
+	for (; y1 < y2; y1++) {
+		remain = 0;
+		len = (x2 - x1) * 3;
+		dst_offset = (y1 * GM12U320_REAL_WIDTH + x1) * 3;
+		block = dst_offset / DATA_BLOCK_CONTENT_SIZE;
+		dst_offset %= DATA_BLOCK_CONTENT_SIZE;
+
+		if ((dst_offset + len) > DATA_BLOCK_CONTENT_SIZE) {
+			remain = dst_offset + len - DATA_BLOCK_CONTENT_SIZE;
+			len = DATA_BLOCK_CONTENT_SIZE - dst_offset;
+		}
+
+		dst_offset += DATA_BLOCK_HEADER_SIZE;
+		len /= 3;
+
+		gm12u320_32bpp_to_24bpp_packed(
+			gm12u320->data_buf[block] + dst_offset,
+			src, len);
+
+		if (remain) {
+			block++;
+			dst_offset = DATA_BLOCK_HEADER_SIZE;
+			gm12u320_32bpp_to_24bpp_packed(
+				gm12u320->data_buf[block] + dst_offset,
+				src + len * 4, remain / 3);
+		}
+		src += fb->pitches[0];
+	}
+
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+put_fb:
+	drm_framebuffer_put(fb);
+	gm12u320->fb_update.fb = NULL;
+unlock:
+	mutex_unlock(&gm12u320->fb_update.lock);
+}
+
+static void gm12u320_fb_update_work(struct work_struct *work)
+{
+	struct gm12u320_device *gm12u320 =
+		container_of(to_delayed_work(work), struct gm12u320_device,
+			     fb_update.work);
+	struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
+	int block, block_size, len;
+	int ret = 0;
+
+	gm12u320_copy_fb_to_blocks(gm12u320);
+
+	for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
+		if (block == GM12U320_BLOCK_COUNT - 1)
+			block_size = DATA_LAST_BLOCK_SIZE;
+		else
+			block_size = DATA_BLOCK_SIZE;
+
+		/* Send data command to device */
+		memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
+		gm12u320->cmd_buf[8] = block_size & 0xff;
+		gm12u320->cmd_buf[9] = block_size >> 8;
+		gm12u320->cmd_buf[20] = 0xfc - block * 4;
+		gm12u320->cmd_buf[21] =
+			block | (gm12u320->fb_update.frame << 7);
+
+		ret = usb_bulk_msg(udev,
+				   usb_sndbulkpipe(udev, DATA_SND_EPT),
+				   gm12u320->cmd_buf, CMD_SIZE, &len,
+				   CMD_TIMEOUT);
+		if (ret || len != CMD_SIZE)
+			goto err;
+
+		/* Send data block to device */
+		ret = usb_bulk_msg(udev,
+				   usb_sndbulkpipe(udev, DATA_SND_EPT),
+				   gm12u320->data_buf[block], block_size,
+				   &len, DATA_TIMEOUT);
+		if (ret || len != block_size)
+			goto err;
+
+		/* Read status */
+		ret = usb_bulk_msg(udev,
+				   usb_rcvbulkpipe(udev, DATA_RCV_EPT),
+				   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+				   CMD_TIMEOUT);
+		if (ret || len != READ_STATUS_SIZE)
+			goto err;
+	}
+
+	/* Send draw command to device */
+	memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, DATA_SND_EPT),
+			   gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
+	if (ret || len != CMD_SIZE)
+		goto err;
+
+	/* Read status */
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, DATA_RCV_EPT),
+			   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+			   gm12u320->fb_update.draw_status_timeout);
+	if (ret || len != READ_STATUS_SIZE)
+		goto err;
+
+	gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
+	gm12u320->fb_update.frame = !gm12u320->fb_update.frame;
+
+	/*
+	 * We must draw a frame every 2s otherwise the projector
+	 * switches back to showing its logo.
+	 */
+	queue_delayed_work(system_dfl_long_wq, &gm12u320->fb_update.work,
+			   msecs_to_jiffies(IDLE_TIMEOUT));
+
+	return;
+err:
+	/* Do not log errors caused by module unload or device unplug */
+	if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
+		GM12U320_ERR("Frame update error: %d\n", ret);
+}
+
+static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
+				   const struct iosys_map *map,
+				   struct drm_rect *dirty)
+{
+	struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
+	struct drm_framebuffer *old_fb = NULL;
+	bool wakeup = false;
+
+	mutex_lock(&gm12u320->fb_update.lock);
+
+	if (gm12u320->fb_update.fb != fb) {
+		old_fb = gm12u320->fb_update.fb;
+		drm_framebuffer_get(fb);
+		gm12u320->fb_update.fb = fb;
+		gm12u320->fb_update.rect = *dirty;
+		gm12u320->fb_update.src_map = *map;
+		wakeup = true;
+	} else {
+		struct drm_rect *rect = &gm12u320->fb_update.rect;
+
+		rect->x1 = min(rect->x1, dirty->x1);
+		rect->y1 = min(rect->y1, dirty->y1);
+		rect->x2 = max(rect->x2, dirty->x2);
+		rect->y2 = max(rect->y2, dirty->y2);
+	}
+
+	mutex_unlock(&gm12u320->fb_update.lock);
+
+	if (wakeup)
+		mod_delayed_work(system_dfl_long_wq,
+				 &gm12u320->fb_update.work, 0);
+
+	if (old_fb)
+		drm_framebuffer_put(old_fb);
+}
+
+static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
+{
+	struct drm_framebuffer *old_fb;
+
+	cancel_delayed_work_sync(&gm12u320->fb_update.work);
+
+	mutex_lock(&gm12u320->fb_update.lock);
+	old_fb = gm12u320->fb_update.fb;
+	gm12u320->fb_update.fb = NULL;
+	iosys_map_clear(&gm12u320->fb_update.src_map);
+	mutex_unlock(&gm12u320->fb_update.lock);
+
+	drm_framebuffer_put(old_fb);
+}
+
+static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
+{
+	return gm12u320_misc_request(gm12u320, MISC_REQ_GET_SET_ECO_A,
+				     MISC_REQ_GET_SET_ECO_B, 0x01 /* set */,
+				     eco_mode ? 0x01 : 0x00, 0x00, 0x01);
+}
+
+/* ------------------------------------------------------------------ */
+/* gm12u320 connector						      */
+
+/*
+ * We use fake EDID info so that userspace know that it is dealing with
+ * an Acer projector, rather then listing this as an "unknown" monitor.
+ * Note this assumes this driver is only ever used with the Acer C120, if we
+ * add support for other devices the vendor and model should be parameterized.
+ */
+static const struct edid gm12u320_edid = {
+	.header		= { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
+	.mfg_id		= { 0x04, 0x72 },	/* "ACR" */
+	.prod_code	= { 0x20, 0xc1 },	/* C120h */
+	.serial		= 0xaa55aa55,
+	.mfg_week	= 1,
+	.mfg_year	= 16,
+	.version	= 1,			/* EDID 1.3 */
+	.revision	= 3,			/* EDID 1.3 */
+	.input		= 0x08,			/* Analog input */
+	.features	= 0x0a,			/* Pref timing in DTD 1 */
+	.standard_timings = { { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 },
+			      { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 } },
+	.detailed_timings = { {
+		.pixel_clock = 3383,
+		/* hactive = 848, hblank = 256 */
+		.data.pixel_data.hactive_lo = 0x50,
+		.data.pixel_data.hblank_lo = 0x00,
+		.data.pixel_data.hactive_hblank_hi = 0x31,
+		/* vactive = 480, vblank = 28 */
+		.data.pixel_data.vactive_lo = 0xe0,
+		.data.pixel_data.vblank_lo = 0x1c,
+		.data.pixel_data.vactive_vblank_hi = 0x10,
+		/* hsync offset 40 pw 128, vsync offset 1 pw 4 */
+		.data.pixel_data.hsync_offset_lo = 0x28,
+		.data.pixel_data.hsync_pulse_width_lo = 0x80,
+		.data.pixel_data.vsync_offset_pulse_width_lo = 0x14,
+		.data.pixel_data.hsync_vsync_offset_pulse_width_hi = 0x00,
+		/* Digital separate syncs, hsync+, vsync+ */
+		.data.pixel_data.misc = 0x1e,
+	}, {
+		.pixel_clock = 0,
+		.data.other_data.type = 0xfd, /* Monitor ranges */
+		.data.other_data.data.range.min_vfreq = 59,
+		.data.other_data.data.range.max_vfreq = 61,
+		.data.other_data.data.range.min_hfreq_khz = 29,
+		.data.other_data.data.range.max_hfreq_khz = 32,
+		.data.other_data.data.range.pixel_clock_mhz = 4, /* 40 MHz */
+		.data.other_data.data.range.flags = 0,
+		.data.other_data.data.range.formula.cvt = {
+			0xa0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 },
+	}, {
+		.pixel_clock = 0,
+		.data.other_data.type = 0xfc, /* Model string */
+		.data.other_data.data.str.str = {
+			'P', 'r', 'o', 'j', 'e', 'c', 't', 'o', 'r', '\n',
+			' ', ' ',  ' ' },
+	}, {
+		.pixel_clock = 0,
+		.data.other_data.type = 0xfe, /* Unspecified text / padding */
+		.data.other_data.data.str.str = {
+			'\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
+			' ', ' ',  ' ' },
+	} },
+	.checksum = 0x13,
+};
+
+static int gm12u320_conn_get_modes(struct drm_connector *connector)
+{
+	const struct drm_edid *drm_edid;
+	int count;
+
+	drm_edid = drm_edid_alloc(&gm12u320_edid, sizeof(gm12u320_edid));
+	drm_edid_connector_update(connector, drm_edid);
+	count = drm_edid_connector_add_modes(connector);
+	drm_edid_free(drm_edid);
+
+	return count;
+}
+
+static const struct drm_connector_helper_funcs gm12u320_conn_helper_funcs = {
+	.get_modes = gm12u320_conn_get_modes,
+};
+
+static const struct drm_connector_funcs gm12u320_conn_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int gm12u320_conn_init(struct gm12u320_device *gm12u320)
+{
+	drm_connector_helper_add(&gm12u320->conn, &gm12u320_conn_helper_funcs);
+	return drm_connector_init(&gm12u320->dev, &gm12u320->conn,
+				  &gm12u320_conn_funcs, DRM_MODE_CONNECTOR_VGA);
+}
+
+/* ------------------------------------------------------------------ */
+/* gm12u320 (simple) display pipe				      */
+
+static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
+				 struct drm_crtc_state *crtc_state,
+				 struct drm_plane_state *plane_state)
+{
+	struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
+	struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+
+	gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
+	gm12u320_fb_mark_dirty(plane_state->fb, &shadow_plane_state->data[0], &rect);
+}
+
+static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+	struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
+
+	gm12u320_stop_fb_update(gm12u320);
+}
+
+static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
+				 struct drm_plane_state *old_state)
+{
+	struct drm_plane_state *state = pipe->plane.state;
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
+	struct drm_rect rect;
+
+	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
+		gm12u320_fb_mark_dirty(state->fb, &shadow_plane_state->data[0], &rect);
+}
+
+static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
+	.enable	    = gm12u320_pipe_enable,
+	.disable    = gm12u320_pipe_disable,
+	.update	    = gm12u320_pipe_update,
+	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
+};
+
+static const uint32_t gm12u320_pipe_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+static const uint64_t gm12u320_pipe_modifiers[] = {
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
+DEFINE_DRM_GEM_FOPS(gm12u320_fops);
+
+static const struct drm_driver gm12u320_drm_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+
+	.name		 = DRIVER_NAME,
+	.desc		 = DRIVER_DESC,
+	.major		 = DRIVER_MAJOR,
+	.minor		 = DRIVER_MINOR,
+
+	.fops		 = &gm12u320_fops,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	DRM_FBDEV_SHMEM_DRIVER_OPS,
+};
+
+static const struct drm_mode_config_funcs gm12u320_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int gm12u320_usb_probe(struct usb_interface *interface,
+			      const struct usb_device_id *id)
+{
+	struct gm12u320_device *gm12u320;
+	struct drm_device *dev;
+	struct device *dma_dev;
+	int ret;
+
+	/*
+	 * The gm12u320 presents itself to the system as 2 usb mass-storage
+	 * interfaces, we only care about / need the first one.
+	 */
+	if (interface->cur_altsetting->desc.bInterfaceNumber != 0)
+		return -ENODEV;
+
+	gm12u320 = devm_drm_dev_alloc(&interface->dev, &gm12u320_drm_driver,
+				      struct gm12u320_device, dev);
+	if (IS_ERR(gm12u320))
+		return PTR_ERR(gm12u320);
+	dev = &gm12u320->dev;
+
+	dma_dev = usb_intf_get_dma_device(interface);
+	if (dma_dev) {
+		drm_dev_set_dma_dev(dev, dma_dev);
+		put_device(dma_dev);
+	} else {
+		drm_warn(dev, "buffer sharing not supported"); /* not an error */
+	}
+
+	INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
+	mutex_init(&gm12u320->fb_update.lock);
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
+	dev->mode_config.min_width = GM12U320_USER_WIDTH;
+	dev->mode_config.max_width = GM12U320_USER_WIDTH;
+	dev->mode_config.min_height = GM12U320_HEIGHT;
+	dev->mode_config.max_height = GM12U320_HEIGHT;
+	dev->mode_config.funcs = &gm12u320_mode_config_funcs;
+
+	ret = gm12u320_usb_alloc(gm12u320);
+	if (ret)
+		return ret;
+
+	ret = gm12u320_set_ecomode(gm12u320);
+	if (ret)
+		return ret;
+
+	ret = gm12u320_conn_init(gm12u320);
+	if (ret)
+		return ret;
+
+	ret = drm_simple_display_pipe_init(&gm12u320->dev,
+					   &gm12u320->pipe,
+					   &gm12u320_pipe_funcs,
+					   gm12u320_pipe_formats,
+					   ARRAY_SIZE(gm12u320_pipe_formats),
+					   gm12u320_pipe_modifiers,
+					   &gm12u320->conn);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(dev);
+
+	usb_set_intfdata(interface, dev);
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		return ret;
+
+	drm_client_setup(dev, NULL);
+
+	return 0;
+}
+
+static void gm12u320_usb_disconnect(struct usb_interface *interface)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+
+	drm_dev_unplug(dev);
+	drm_atomic_helper_shutdown(dev);
+}
+
+static int gm12u320_suspend(struct usb_interface *interface,
+			    pm_message_t message)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+
+	return drm_mode_config_helper_suspend(dev);
+}
+
+static int gm12u320_resume(struct usb_interface *interface)
+{
+	struct drm_device *dev = usb_get_intfdata(interface);
+	struct gm12u320_device *gm12u320 = to_gm12u320(dev);
+
+	gm12u320_set_ecomode(gm12u320);
+
+	return drm_mode_config_helper_resume(dev);
+}
+
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE(0x1de1, 0xc102) },
+	{},
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_driver gm12u320_usb_driver = {
+	.name = "gm12u320",
+	.probe = gm12u320_usb_probe,
+	.disconnect = gm12u320_usb_disconnect,
+	.id_table = id_table,
+	.suspend = pm_ptr(gm12u320_suspend),
+	.resume = pm_ptr(gm12u320_resume),
+	.reset_resume = pm_ptr(gm12u320_resume),
+};
+
+module_usb_driver(gm12u320_usb_driver);
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("GM12U320 driver for USB projectors");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/hx8357d.c b/drivers/gpu/drm/tiny/hx8357d.c
new file mode 100644
index 000000000..f942a8d09
--- /dev/null
+++ b/drivers/gpu/drm/tiny/hx8357d.c
@@ -0,0 +1,403 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for the HX8357D LCD controller
+ *
+ * Copyright 2018 Broadcom
+ * Copyright 2018 David Lechner <david@lechnology.com>
+ * Copyright 2016 Noralf Trønnes
+ * Copyright (C) 2015 Adafruit Industries
+ * Copyright (C) 2013 Christian Vogelgsang
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_print.h>
+#include <video/mipi_display.h>
+
+#define HX8357D_SETOSC 0xb0
+#define HX8357D_SETPOWER 0xb1
+#define HX8357D_SETRGB 0xb3
+#define HX8357D_SETCYC 0xb3
+#define HX8357D_SETCOM 0xb6
+#define HX8357D_SETEXTC 0xb9
+#define HX8357D_SETSTBA 0xc0
+#define HX8357D_SETPANEL 0xcc
+#define HX8357D_SETGAMMA 0xe0
+
+#define HX8357D_MADCTL_MY  0x80
+#define HX8357D_MADCTL_MX  0x40
+#define HX8357D_MADCTL_MV  0x20
+#define HX8357D_MADCTL_ML  0x10
+#define HX8357D_MADCTL_RGB 0x00
+#define HX8357D_MADCTL_BGR 0x08
+#define HX8357D_MADCTL_MH  0x04
+
+struct hx8357d_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct hx8357d_device *to_hx8357d_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct hx8357d_device, dbidev);
+}
+
+static const u32 hx8357d_plane_formats[] = {
+	DRM_MIPI_DBI_PLANE_FORMATS,
+};
+
+static const u64 hx8357d_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs hx8357d_plane_helper_funcs = {
+	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs hx8357d_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void hx8357d_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					      struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct hx8357d_device *hx8357d = to_hx8357d_device(drm);
+	struct mipi_dbi_dev *dbidev = &hx8357d->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	/* setextc */
+	mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57);
+	msleep(150);
+
+	/* setRGB which also enables SDO */
+	mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06);
+
+	/* -1.52V */
+	mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25);
+
+	/* Normal mode 70Hz, Idle mode 55 Hz */
+	mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68);
+
+	/* Set Panel - BGR, Gate direction swapped */
+	mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05);
+
+	mipi_dbi_command(dbi, HX8357D_SETPOWER,
+			 0x00,  /* Not deep standby */
+			 0x15,  /* BT */
+			 0x1C,  /* VSPR */
+			 0x1C,  /* VSNR */
+			 0x83,  /* AP */
+			 0xAA);  /* FS */
+
+	mipi_dbi_command(dbi, HX8357D_SETSTBA,
+			 0x50,  /* OPON normal */
+			 0x50,  /* OPON idle */
+			 0x01,  /* STBA */
+			 0x3C,  /* STBA */
+			 0x1E,  /* STBA */
+			 0x08);  /* GEN */
+
+	mipi_dbi_command(dbi, HX8357D_SETCYC,
+			 0x02,  /* NW 0x02 */
+			 0x40,  /* RTN */
+			 0x00,  /* DIV */
+			 0x2A,  /* DUM */
+			 0x2A,  /* DUM */
+			 0x0D,  /* GDON */
+			 0x78);  /* GDOFF */
+
+	mipi_dbi_command(dbi, HX8357D_SETGAMMA,
+			 0x02,
+			 0x0A,
+			 0x11,
+			 0x1d,
+			 0x23,
+			 0x35,
+			 0x41,
+			 0x4b,
+			 0x4b,
+			 0x42,
+			 0x3A,
+			 0x27,
+			 0x1B,
+			 0x08,
+			 0x09,
+			 0x03,
+			 0x02,
+			 0x0A,
+			 0x11,
+			 0x1d,
+			 0x23,
+			 0x35,
+			 0x41,
+			 0x4b,
+			 0x4b,
+			 0x42,
+			 0x3A,
+			 0x27,
+			 0x1B,
+			 0x08,
+			 0x09,
+			 0x03,
+			 0x00,
+			 0x01);
+
+	/* 16 bit */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
+			 MIPI_DCS_PIXEL_FMT_16BIT);
+
+	/* TE off */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00);
+
+	/* tear line */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
+
+	/* Exit Sleep */
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(150);
+
+	/* display on */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	usleep_range(5000, 7000);
+
+out_enable:
+	switch (dbidev->rotation) {
+	default:
+		addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
+		break;
+	case 90:
+		addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
+		break;
+	case 180:
+		addr_mode = 0;
+		break;
+	case 270:
+		addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
+		break;
+	}
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+	backlight_enable(dbidev->backlight);
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs hx8357d_crtc_helper_funcs = {
+	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,
+	.atomic_enable = hx8357d_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs hx8357d_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs hx8357d_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs hx8357d_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs hx8357d_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs hx8357d_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs hx8357d_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+static const struct drm_display_mode yx350hv15_mode = {
+	DRM_SIMPLE_MODE(320, 480, 60, 75),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(hx8357d_fops);
+
+static const struct drm_driver hx8357d_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &hx8357d_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "hx8357d",
+	.desc			= "HX8357D",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id hx8357d_of_match[] = {
+	{ .compatible = "adafruit,yx350hv15" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hx8357d_of_match);
+
+static const struct spi_device_id hx8357d_id[] = {
+	{ "yx350hv15", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, hx8357d_id);
+
+static int hx8357d_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct hx8357d_device *hx8357d;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct gpio_desc *dc;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	u32 rotation = 0;
+	int ret;
+
+	hx8357d = devm_drm_dev_alloc(dev, &hx8357d_driver, struct hx8357d_device, dbidev.drm);
+	if (IS_ERR(hx8357d))
+		return PTR_ERR(hx8357d);
+	dbidev = &hx8357d->dbidev;
+	drm = &dbidev->drm;
+
+	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc))
+		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc);
+	if (ret)
+		return ret;
+
+	ret = drm_mipi_dbi_dev_init(dbidev, &yx350hv15_mode, hx8357d_plane_formats[0],
+				    rotation, 0);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &hx8357d_mode_config_funcs;
+	drm->mode_config.preferred_depth = 16;
+	drm->mode_config.helper_private = &hx8357d_mode_config_helper_funcs;
+
+	plane = &hx8357d->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &hx8357d_plane_funcs,
+				       hx8357d_plane_formats, ARRAY_SIZE(hx8357d_plane_formats),
+				       hx8357d_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &hx8357d_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &hx8357d->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &hx8357d_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &hx8357d_crtc_helper_funcs);
+
+	encoder = &hx8357d->encoder;
+	ret = drm_encoder_init(drm, encoder, &hx8357d_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &hx8357d->connector;
+	ret = drm_connector_init(drm, connector, &hx8357d_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &hx8357d_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void hx8357d_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void hx8357d_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver hx8357d_spi_driver = {
+	.driver = {
+		.name = "hx8357d",
+		.of_match_table = hx8357d_of_match,
+	},
+	.id_table = hx8357d_id,
+	.probe = hx8357d_probe,
+	.remove = hx8357d_remove,
+	.shutdown = hx8357d_shutdown,
+};
+module_spi_driver(hx8357d_spi_driver);
+
+MODULE_DESCRIPTION("HX8357D DRM driver");
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/ili9163.c b/drivers/gpu/drm/tiny/ili9163.c
new file mode 100644
index 000000000..884242450
--- /dev/null
+++ b/drivers/gpu/drm/tiny/ili9163.c
@@ -0,0 +1,332 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_print.h>
+
+#include <video/mipi_display.h>
+
+#define ILI9163_FRMCTR1		0xb1
+
+#define ILI9163_PWCTRL1		0xc0
+#define ILI9163_PWCTRL2		0xc1
+#define ILI9163_VMCTRL1		0xc5
+#define ILI9163_VMCTRL2		0xc7
+#define ILI9163_PWCTRLA		0xcb
+#define ILI9163_PWCTRLB		0xcf
+
+#define ILI9163_EN3GAM		0xf2
+
+#define ILI9163_MADCTL_BGR	BIT(3)
+#define ILI9163_MADCTL_MV	BIT(5)
+#define ILI9163_MADCTL_MX	BIT(6)
+#define ILI9163_MADCTL_MY	BIT(7)
+
+struct ili9163_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct ili9163_device *to_ili9163_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct ili9163_device, dbidev);
+}
+
+static const u32 ili9163_plane_formats[] = {
+	DRM_MIPI_DBI_PLANE_FORMATS,
+};
+
+static const u64 ili9163_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs ili9163_plane_helper_funcs = {
+	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs ili9163_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void ili9163_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					      struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct ili9163_device *ili9163 = to_ili9163_device(drm);
+	struct mipi_dbi_dev *dbidev = &ili9163->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	/* Gamma */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x04);
+	mipi_dbi_command(dbi, ILI9163_EN3GAM, 0x00);
+
+	/* Frame Rate */
+	mipi_dbi_command(dbi, ILI9163_FRMCTR1, 0x0a, 0x14);
+
+	/* Power Control */
+	mipi_dbi_command(dbi, ILI9163_PWCTRL1, 0x0a, 0x00);
+	mipi_dbi_command(dbi, ILI9163_PWCTRL2, 0x02);
+
+	/* VCOM */
+	mipi_dbi_command(dbi, ILI9163_VMCTRL1, 0x2f, 0x3e);
+	mipi_dbi_command(dbi, ILI9163_VMCTRL2, 0x40);
+
+	/* Memory Access Control */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
+
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(100);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+out_enable:
+	switch (dbidev->rotation) {
+	default:
+		addr_mode = ILI9163_MADCTL_MX | ILI9163_MADCTL_MY;
+		break;
+	case 90:
+		addr_mode = ILI9163_MADCTL_MX | ILI9163_MADCTL_MV;
+		break;
+	case 180:
+		addr_mode = 0;
+		break;
+	case 270:
+		addr_mode = ILI9163_MADCTL_MY | ILI9163_MADCTL_MV;
+		break;
+	}
+	addr_mode |= ILI9163_MADCTL_BGR;
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+	backlight_enable(dbidev->backlight);
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs ili9163_crtc_helper_funcs = {
+	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,
+	.atomic_enable = ili9163_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs ili9163_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs ili9163_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs ili9163_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs ili9163_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs ili9163_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs ili9163_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+static const struct drm_display_mode yx240qv29_mode = {
+	DRM_SIMPLE_MODE(128, 160, 28, 35),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(ili9163_fops);
+
+static struct drm_driver ili9163_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &ili9163_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "ili9163",
+	.desc			= "Ilitek ILI9163",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id ili9163_of_match[] = {
+	{ .compatible = "newhaven,1.8-128160EF" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili9163_of_match);
+
+static const struct spi_device_id ili9163_id[] = {
+	{ "nhd-1.8-128160EF", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ili9163_id);
+
+static int ili9163_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9163_device *ili9163;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *dc;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	u32 rotation = 0;
+	int ret;
+
+	ili9163 = devm_drm_dev_alloc(dev, &ili9163_driver, struct ili9163_device, dbidev.drm);
+	if (IS_ERR(ili9163))
+		return PTR_ERR(ili9163);
+	dbidev = &ili9163->dbidev;
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+
+	spi_set_drvdata(spi, drm);
+
+	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
+		return PTR_ERR(dbi->reset);
+	}
+
+	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
+		return PTR_ERR(dc);
+	}
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, dbi, dc);
+	if (ret)
+		return ret;
+
+	ret = drm_mipi_dbi_dev_init(dbidev, &yx240qv29_mode, ili9163_plane_formats[0],
+				    rotation, 0);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &ili9163_mode_config_funcs;
+	drm->mode_config.preferred_depth = 16;
+	drm->mode_config.helper_private = &ili9163_mode_config_helper_funcs;
+
+	plane = &ili9163->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &ili9163_plane_funcs,
+				       ili9163_plane_formats, ARRAY_SIZE(ili9163_plane_formats),
+				       ili9163_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &ili9163_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &ili9163->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &ili9163_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &ili9163_crtc_helper_funcs);
+
+	encoder = &ili9163->encoder;
+	ret = drm_encoder_init(drm, encoder, &ili9163_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &ili9163->connector;
+	ret = drm_connector_init(drm, connector, &ili9163_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &ili9163_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void ili9163_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void ili9163_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver ili9163_spi_driver = {
+	.driver = {
+		.name = "ili9163",
+		.of_match_table = ili9163_of_match,
+	},
+	.id_table = ili9163_id,
+	.probe = ili9163_probe,
+	.remove = ili9163_remove,
+	.shutdown = ili9163_shutdown,
+};
+module_spi_driver(ili9163_spi_driver);
+
+MODULE_DESCRIPTION("Ilitek ILI9163 DRM driver");
+MODULE_AUTHOR("Daniel Mack <daniel@zonque.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/ili9225.c b/drivers/gpu/drm/tiny/ili9225.c
new file mode 100644
index 000000000..5bf52a8fd
--- /dev/null
+++ b/drivers/gpu/drm/tiny/ili9225.c
@@ -0,0 +1,561 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DRM driver for Ilitek ILI9225 panels
+ *
+ * Copyright 2017 David Lechner <david@lechnology.com>
+ *
+ * Some code copied from mipi-dbi.c
+ * Copyright 2016 Noralf Trønnes
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-buf.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_print.h>
+#include <drm/drm_rect.h>
+
+#define ILI9225_DRIVER_READ_CODE	0x00
+#define ILI9225_DRIVER_OUTPUT_CONTROL	0x01
+#define ILI9225_LCD_AC_DRIVING_CONTROL	0x02
+#define ILI9225_ENTRY_MODE		0x03
+#define ILI9225_DISPLAY_CONTROL_1	0x07
+#define ILI9225_BLANK_PERIOD_CONTROL_1	0x08
+#define ILI9225_FRAME_CYCLE_CONTROL	0x0b
+#define ILI9225_INTERFACE_CONTROL	0x0c
+#define ILI9225_OSCILLATION_CONTROL	0x0f
+#define ILI9225_POWER_CONTROL_1		0x10
+#define ILI9225_POWER_CONTROL_2		0x11
+#define ILI9225_POWER_CONTROL_3		0x12
+#define ILI9225_POWER_CONTROL_4		0x13
+#define ILI9225_POWER_CONTROL_5		0x14
+#define ILI9225_VCI_RECYCLING		0x15
+#define ILI9225_RAM_ADDRESS_SET_1	0x20
+#define ILI9225_RAM_ADDRESS_SET_2	0x21
+#define ILI9225_WRITE_DATA_TO_GRAM	0x22
+#define ILI9225_SOFTWARE_RESET		0x28
+#define ILI9225_GATE_SCAN_CONTROL	0x30
+#define ILI9225_VERTICAL_SCROLL_1	0x31
+#define ILI9225_VERTICAL_SCROLL_2	0x32
+#define ILI9225_VERTICAL_SCROLL_3	0x33
+#define ILI9225_PARTIAL_DRIVING_POS_1	0x34
+#define ILI9225_PARTIAL_DRIVING_POS_2	0x35
+#define ILI9225_HORIZ_WINDOW_ADDR_1	0x36
+#define ILI9225_HORIZ_WINDOW_ADDR_2	0x37
+#define ILI9225_VERT_WINDOW_ADDR_1	0x38
+#define ILI9225_VERT_WINDOW_ADDR_2	0x39
+#define ILI9225_GAMMA_CONTROL_1		0x50
+#define ILI9225_GAMMA_CONTROL_2		0x51
+#define ILI9225_GAMMA_CONTROL_3		0x52
+#define ILI9225_GAMMA_CONTROL_4		0x53
+#define ILI9225_GAMMA_CONTROL_5		0x54
+#define ILI9225_GAMMA_CONTROL_6		0x55
+#define ILI9225_GAMMA_CONTROL_7		0x56
+#define ILI9225_GAMMA_CONTROL_8		0x57
+#define ILI9225_GAMMA_CONTROL_9		0x58
+#define ILI9225_GAMMA_CONTROL_10	0x59
+
+struct ili9225_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct ili9225_device *to_ili9225_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct ili9225_device, dbidev);
+}
+
+static inline int ili9225_command(struct mipi_dbi *dbi, u8 cmd, u16 data)
+{
+	u8 par[2] = { data >> 8, data & 0xff };
+
+	return mipi_dbi_command_buf(dbi, cmd, par, 2);
+}
+
+static void ili9225_fb_dirty(struct iosys_map *src, struct drm_framebuffer *fb,
+			     struct drm_rect *rect, struct drm_format_conv_state *fmtcnv_state)
+{
+	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev);
+	unsigned int height = rect->y2 - rect->y1;
+	unsigned int width = rect->x2 - rect->x1;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	bool swap = dbi->swap_bytes;
+	u16 x_start, y_start;
+	u16 x1, x2, y1, y2;
+	int ret = 0;
+	bool full;
+	void *tr;
+
+	full = width == fb->width && height == fb->height;
+
+	DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
+
+	if (!dbi->dc || !full || swap ||
+	    fb->format->format == DRM_FORMAT_XRGB8888) {
+		tr = dbidev->tx_buf;
+		ret = mipi_dbi_buf_copy(tr, src, fb, rect, swap, fmtcnv_state);
+		if (ret)
+			goto err_msg;
+	} else {
+		tr = src->vaddr; /* TODO: Use mapping abstraction properly */
+	}
+
+	switch (dbidev->rotation) {
+	default:
+		x1 = rect->x1;
+		x2 = rect->x2 - 1;
+		y1 = rect->y1;
+		y2 = rect->y2 - 1;
+		x_start = x1;
+		y_start = y1;
+		break;
+	case 90:
+		x1 = rect->y1;
+		x2 = rect->y2 - 1;
+		y1 = fb->width - rect->x2;
+		y2 = fb->width - rect->x1 - 1;
+		x_start = x1;
+		y_start = y2;
+		break;
+	case 180:
+		x1 = fb->width - rect->x2;
+		x2 = fb->width - rect->x1 - 1;
+		y1 = fb->height - rect->y2;
+		y2 = fb->height - rect->y1 - 1;
+		x_start = x2;
+		y_start = y2;
+		break;
+	case 270:
+		x1 = fb->height - rect->y2;
+		x2 = fb->height - rect->y1 - 1;
+		y1 = rect->x1;
+		y2 = rect->x2 - 1;
+		x_start = x2;
+		y_start = y1;
+		break;
+	}
+
+	ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_1, x2);
+	ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_2, x1);
+	ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_1, y2);
+	ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_2, y1);
+
+	ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, x_start);
+	ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, y_start);
+
+	ret = mipi_dbi_command_buf(dbi, ILI9225_WRITE_DATA_TO_GRAM, tr,
+				   width * height * 2);
+err_msg:
+	if (ret)
+		dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
+}
+
+static const u32 ili9225_plane_formats[] = {
+	DRM_MIPI_DBI_PLANE_FORMATS,
+};
+
+static const u64 ili9225_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static void ili9225_plane_helper_atomic_update(struct drm_plane *plane,
+					       struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = plane->dev;
+	struct drm_plane_state *plane_state = plane->state;
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct drm_framebuffer *fb = plane_state->fb;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_rect rect;
+	int idx;
+
+	if (!plane_state->fb)
+		return;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	if (drm_atomic_helper_damage_merged(old_plane_state, plane_state, &rect))
+		ili9225_fb_dirty(&shadow_plane_state->data[0], fb, &rect,
+				 &shadow_plane_state->fmtcnv_state);
+
+	drm_dev_exit(idx);
+}
+
+static const struct drm_plane_helper_funcs ili9225_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = drm_mipi_dbi_plane_helper_atomic_check,
+	.atomic_update = ili9225_plane_helper_atomic_update,
+};
+
+static const struct drm_plane_funcs ili9225_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void ili9225_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					      struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct ili9225_device *ili9225 = to_ili9225_device(drm);
+	struct mipi_dbi_dev *dbidev = &ili9225->dbidev;
+	struct device *dev = drm->dev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	int ret, idx;
+	u8 am_id;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	mipi_dbi_hw_reset(dbi);
+
+	/*
+	 * There don't seem to be two example init sequences that match, so
+	 * using the one from the popular Arduino library for this display.
+	 * https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp
+	 */
+
+	ret = ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0000);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
+		goto out_exit;
+	}
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0000);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x0000);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x0000);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x0000);
+
+	msleep(40);
+
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0018);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x6121);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x006f);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x495f);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0800);
+
+	msleep(10);
+
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x103b);
+
+	msleep(50);
+
+	switch (dbidev->rotation) {
+	default:
+		am_id = 0x30;
+		break;
+	case 90:
+		am_id = 0x18;
+		break;
+	case 180:
+		am_id = 0x00;
+		break;
+	case 270:
+		am_id = 0x28;
+		break;
+	}
+	ili9225_command(dbi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c);
+	ili9225_command(dbi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100);
+	ili9225_command(dbi, ILI9225_ENTRY_MODE, 0x1000 | am_id);
+	ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
+	ili9225_command(dbi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808);
+	ili9225_command(dbi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100);
+	ili9225_command(dbi, ILI9225_INTERFACE_CONTROL, 0x0000);
+	ili9225_command(dbi, ILI9225_OSCILLATION_CONTROL, 0x0d01);
+	ili9225_command(dbi, ILI9225_VCI_RECYCLING, 0x0020);
+	ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, 0x0000);
+	ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, 0x0000);
+
+	ili9225_command(dbi, ILI9225_GATE_SCAN_CONTROL, 0x0000);
+	ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_1, 0x00db);
+	ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_2, 0x0000);
+	ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_3, 0x0000);
+	ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db);
+	ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000);
+
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_1, 0x0000);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_2, 0x0808);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_3, 0x080a);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_4, 0x000a);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_5, 0x0a08);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_6, 0x0808);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_7, 0x0000);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_8, 0x0a00);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_9, 0x0710);
+	ili9225_command(dbi, ILI9225_GAMMA_CONTROL_10, 0x0710);
+
+	ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0012);
+
+	msleep(50);
+
+	ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
+
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static void ili9225_crtc_helper_atomic_disable(struct drm_crtc *crtc,
+					       struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct ili9225_device *ili9225 = to_ili9225_device(drm);
+	struct mipi_dbi_dev *dbidev = &ili9225->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+
+	DRM_DEBUG_KMS("\n");
+
+	/*
+	 * This callback is not protected by drm_dev_enter/exit since we want to
+	 * turn off the display on regular driver unload. It's highly unlikely
+	 * that the underlying SPI controller is gone should this be called after
+	 * unplug.
+	 */
+
+	ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
+	msleep(50);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
+	msleep(50);
+	ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
+}
+
+static const struct drm_crtc_helper_funcs ili9225_crtc_helper_funcs = {
+	.mode_valid = drm_mipi_dbi_crtc_helper_mode_valid,
+	.atomic_check = drm_mipi_dbi_crtc_helper_atomic_check,
+	.atomic_enable = ili9225_crtc_helper_atomic_enable,
+	.atomic_disable = ili9225_crtc_helper_atomic_disable,
+};
+
+static const struct drm_crtc_funcs ili9225_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs ili9225_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs ili9225_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs ili9225_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs ili9225_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs ili9225_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,
+			       size_t num)
+{
+	struct spi_device *spi = dbi->spi;
+	unsigned int bpw = 8;
+	u32 speed_hz;
+	int ret;
+
+	spi_bus_lock(spi->controller);
+	gpiod_set_value_cansleep(dbi->dc, 0);
+	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
+	ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1);
+	spi_bus_unlock(spi->controller);
+	if (ret || !num)
+		return ret;
+
+	if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes)
+		bpw = 16;
+
+	spi_bus_lock(spi->controller);
+	gpiod_set_value_cansleep(dbi->dc, 1);
+	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
+	ret = mipi_dbi_spi_transfer(spi, speed_hz, bpw, par, num);
+	spi_bus_unlock(spi->controller);
+
+	return ret;
+}
+
+static const struct drm_display_mode ili9225_mode = {
+	DRM_SIMPLE_MODE(176, 220, 35, 44),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(ili9225_fops);
+
+static const struct drm_driver ili9225_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &ili9225_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.name			= "ili9225",
+	.desc			= "Ilitek ILI9225",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id ili9225_of_match[] = {
+	{ .compatible = "vot,v220hf01a-t" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ili9225_of_match);
+
+static const struct spi_device_id ili9225_id[] = {
+	{ "v220hf01a-t", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, ili9225_id);
+
+static int ili9225_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9225_device *ili9225;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *rs;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	u32 rotation = 0;
+	int ret;
+
+	ili9225 = devm_drm_dev_alloc(dev, &ili9225_driver, struct ili9225_device, dbidev.drm);
+	if (IS_ERR(ili9225))
+		return PTR_ERR(ili9225);
+	dbidev = &ili9225->dbidev;
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+
+	dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset))
+		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
+
+	rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
+	if (IS_ERR(rs))
+		return dev_err_probe(dev, PTR_ERR(rs), "Failed to get GPIO 'rs'\n");
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, dbi, rs);
+	if (ret)
+		return ret;
+
+	/* override the command function set in  mipi_dbi_spi_init() */
+	dbi->command = ili9225_dbi_command;
+
+	ret = drm_mipi_dbi_dev_init(dbidev, &ili9225_mode, ili9225_plane_formats[0],
+				    rotation, 0);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &ili9225_mode_config_funcs;
+	drm->mode_config.preferred_depth = 16;
+	drm->mode_config.helper_private = &ili9225_mode_config_helper_funcs;
+
+	plane = &ili9225->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &ili9225_plane_funcs,
+				       ili9225_plane_formats, ARRAY_SIZE(ili9225_plane_formats),
+				       ili9225_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &ili9225_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &ili9225->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &ili9225_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &ili9225_crtc_helper_funcs);
+
+	encoder = &ili9225->encoder;
+	ret = drm_encoder_init(drm, encoder, &ili9225_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &ili9225->connector;
+	ret = drm_connector_init(drm, connector, &ili9225_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &ili9225_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void ili9225_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void ili9225_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver ili9225_spi_driver = {
+	.driver = {
+		.name = "ili9225",
+		.of_match_table = ili9225_of_match,
+	},
+	.id_table = ili9225_id,
+	.probe = ili9225_probe,
+	.remove = ili9225_remove,
+	.shutdown = ili9225_shutdown,
+};
+module_spi_driver(ili9225_spi_driver);
+
+MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
+MODULE_AUTHOR("David Lechner <david@lechnology.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/ili9341.c b/drivers/gpu/drm/tiny/ili9341.c
new file mode 100644
index 000000000..003381aa2
--- /dev/null
+++ b/drivers/gpu/drm/tiny/ili9341.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for Ilitek ILI9341 panels
+ *
+ * Copyright 2018 David Lechner <david@lechnology.com>
+ *
+ * Based on mi0283qt.c:
+ * Copyright 2016 Noralf Trønnes
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_print.h>
+#include <video/mipi_display.h>
+
+#define ILI9341_FRMCTR1		0xb1
+#define ILI9341_DISCTRL		0xb6
+#define ILI9341_ETMOD		0xb7
+
+#define ILI9341_PWCTRL1		0xc0
+#define ILI9341_PWCTRL2		0xc1
+#define ILI9341_VMCTRL1		0xc5
+#define ILI9341_VMCTRL2		0xc7
+#define ILI9341_PWCTRLA		0xcb
+#define ILI9341_PWCTRLB		0xcf
+
+#define ILI9341_PGAMCTRL	0xe0
+#define ILI9341_NGAMCTRL	0xe1
+#define ILI9341_DTCTRLA		0xe8
+#define ILI9341_DTCTRLB		0xea
+#define ILI9341_PWRSEQ		0xed
+
+#define ILI9341_EN3GAM		0xf2
+#define ILI9341_PUMPCTRL	0xf7
+
+#define ILI9341_MADCTL_BGR	BIT(3)
+#define ILI9341_MADCTL_MV	BIT(5)
+#define ILI9341_MADCTL_MX	BIT(6)
+#define ILI9341_MADCTL_MY	BIT(7)
+
+struct ili9341_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct ili9341_device *to_ili9341_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct ili9341_device, dbidev);
+}
+
+static const u32 ili9341_plane_formats[] = {
+	DRM_MIPI_DBI_PLANE_FORMATS,
+};
+
+static const u64 ili9341_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs ili9341_plane_helper_funcs = {
+	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs ili9341_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void ili9341_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					      struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct ili9341_device *ili9341 = to_ili9341_device(drm);
+	struct mipi_dbi_dev *dbidev = &ili9341->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
+
+	mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);
+	mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
+	mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);
+	mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+	mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
+	mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
+
+	/* Power Control */
+	mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x23);
+	mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x10);
+	/* VCOM */
+	mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x3e, 0x28);
+	mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0x86);
+
+	/* Memory Access Control */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
+
+	/* Frame Rate */
+	mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
+
+	/* Gamma */
+	mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+	mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
+			 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
+			 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
+	mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
+			 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
+			 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
+
+	/* DDRAM */
+	mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
+
+	/* Display */
+	mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(100);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+out_enable:
+	switch (dbidev->rotation) {
+	default:
+		addr_mode = ILI9341_MADCTL_MX;
+		break;
+	case 90:
+		addr_mode = ILI9341_MADCTL_MV;
+		break;
+	case 180:
+		addr_mode = ILI9341_MADCTL_MY;
+		break;
+	case 270:
+		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+			    ILI9341_MADCTL_MX;
+		break;
+	}
+	addr_mode |= ILI9341_MADCTL_BGR;
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+	backlight_enable(dbidev->backlight);
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs ili9341_crtc_helper_funcs = {
+	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,
+	.atomic_enable = ili9341_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs ili9341_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs ili9341_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs ili9341_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs ili9341_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs ili9341_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs ili9341_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+static const struct drm_display_mode yx240qv29_mode = {
+	DRM_SIMPLE_MODE(240, 320, 37, 49),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(ili9341_fops);
+
+static const struct drm_driver ili9341_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &ili9341_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "ili9341",
+	.desc			= "Ilitek ILI9341",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id ili9341_of_match[] = {
+	{ .compatible = "adafruit,yx240qv29" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili9341_of_match);
+
+static const struct spi_device_id ili9341_id[] = {
+	{ "yx240qv29", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ili9341_id);
+
+static int ili9341_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9341_device *ili9341;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *dc;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	u32 rotation = 0;
+	int ret;
+
+	ili9341 = devm_drm_dev_alloc(dev, &ili9341_driver, struct ili9341_device, dbidev.drm);
+	if (IS_ERR(ili9341))
+		return PTR_ERR(ili9341);
+	dbidev = &ili9341->dbidev;
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+
+	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset))
+		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
+
+	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc))
+		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, dbi, dc);
+	if (ret)
+		return ret;
+
+	ret = drm_mipi_dbi_dev_init(dbidev, &yx240qv29_mode, ili9341_plane_formats[0],
+				    rotation, 0);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &ili9341_mode_config_funcs;
+	drm->mode_config.preferred_depth = 16;
+	drm->mode_config.helper_private = &ili9341_mode_config_helper_funcs;
+
+	plane = &ili9341->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &ili9341_plane_funcs,
+				       ili9341_plane_formats, ARRAY_SIZE(ili9341_plane_formats),
+				       ili9341_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &ili9341_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &ili9341->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &ili9341_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &ili9341_crtc_helper_funcs);
+
+	encoder = &ili9341->encoder;
+	ret = drm_encoder_init(drm, encoder, &ili9341_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &ili9341->connector;
+	ret = drm_connector_init(drm, connector, &ili9341_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &ili9341_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void ili9341_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void ili9341_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver ili9341_spi_driver = {
+	.driver = {
+		.name = "ili9341",
+		.of_match_table = ili9341_of_match,
+	},
+	.id_table = ili9341_id,
+	.probe = ili9341_probe,
+	.remove = ili9341_remove,
+	.shutdown = ili9341_shutdown,
+};
+module_spi_driver(ili9341_spi_driver);
+
+MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");
+MODULE_AUTHOR("David Lechner <david@lechnology.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/ili9486.c b/drivers/gpu/drm/tiny/ili9486.c
new file mode 100644
index 000000000..c945a9144
--- /dev/null
+++ b/drivers/gpu/drm/tiny/ili9486.c
@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for Ilitek ILI9486 panels
+ *
+ * Copyright 2020 Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_print.h>
+
+#define ILI9486_ITFCTR1         0xb0
+#define ILI9486_PWCTRL1         0xc2
+#define ILI9486_VMCTRL1         0xc5
+#define ILI9486_PGAMCTRL        0xe0
+#define ILI9486_NGAMCTRL        0xe1
+#define ILI9486_DGAMCTRL        0xe2
+#define ILI9486_MADCTL_BGR      BIT(3)
+#define ILI9486_MADCTL_MV       BIT(5)
+#define ILI9486_MADCTL_MX       BIT(6)
+#define ILI9486_MADCTL_MY       BIT(7)
+
+struct ili9486_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct ili9486_device *to_ili9486_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct ili9486_device, dbidev);
+}
+
+/*
+ * The PiScreen/waveshare rpi-lcd-35 has a SPI to 16-bit parallel bus converter
+ * in front of the  display controller. This means that 8-bit values have to be
+ * transferred as 16-bit.
+ */
+static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par,
+			     size_t num)
+{
+	struct spi_device *spi = mipi->spi;
+	unsigned int bpw = 8;
+	void *data = par;
+	u32 speed_hz;
+	int i, ret;
+	__be16 *buf;
+
+	buf = kmalloc(32 * sizeof(u16), GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	/*
+	 * The displays are Raspberry Pi HATs and connected to the 8-bit only
+	 * SPI controller, so 16-bit command and parameters need byte swapping
+	 * before being transferred as 8-bit on the big endian SPI bus.
+	 */
+	buf[0] = cpu_to_be16(*cmd);
+	spi_bus_lock(spi->controller);
+	gpiod_set_value_cansleep(mipi->dc, 0);
+	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 2);
+	ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, buf, 2);
+	spi_bus_unlock(spi->controller);
+	if (ret || !num)
+		goto free;
+
+	/* 8-bit configuration data, not 16-bit pixel data */
+	if (num <= 32) {
+		for (i = 0; i < num; i++)
+			buf[i] = cpu_to_be16(par[i]);
+		num *= 2;
+		data = buf;
+	}
+
+	/*
+	 * Check whether pixel data bytes needs to be swapped or not
+	 */
+	if (*cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes)
+		bpw = 16;
+
+	spi_bus_lock(spi->controller);
+	gpiod_set_value_cansleep(mipi->dc, 1);
+	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
+	ret = mipi_dbi_spi_transfer(spi, speed_hz, bpw, data, num);
+	spi_bus_unlock(spi->controller);
+ free:
+	kfree(buf);
+
+	return ret;
+}
+
+static const u32 ili9486_plane_formats[] = {
+	DRM_MIPI_DBI_PLANE_FORMATS,
+};
+
+static const u64 ili9486_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs ili9486_plane_helper_funcs = {
+	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs ili9486_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void ili9486_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					      struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct ili9486_device *ili9486 = to_ili9486_device(drm);
+	struct mipi_dbi_dev *dbidev = &ili9486->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	mipi_dbi_command(dbi, ILI9486_ITFCTR1);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(250);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
+
+	mipi_dbi_command(dbi, ILI9486_PWCTRL1, 0x44);
+
+	mipi_dbi_command(dbi, ILI9486_VMCTRL1, 0x00, 0x00, 0x00, 0x00);
+
+	mipi_dbi_command(dbi, ILI9486_PGAMCTRL,
+			 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
+			 0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x0);
+	mipi_dbi_command(dbi, ILI9486_NGAMCTRL,
+			 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
+			 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
+	mipi_dbi_command(dbi, ILI9486_DGAMCTRL,
+			 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
+			 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+ out_enable:
+	switch (dbidev->rotation) {
+	case 90:
+		addr_mode = ILI9486_MADCTL_MY;
+		break;
+	case 180:
+		addr_mode = ILI9486_MADCTL_MV;
+		break;
+	case 270:
+		addr_mode = ILI9486_MADCTL_MX;
+		break;
+	default:
+		addr_mode = ILI9486_MADCTL_MV | ILI9486_MADCTL_MY |
+			ILI9486_MADCTL_MX;
+		break;
+	}
+	addr_mode |= ILI9486_MADCTL_BGR;
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+	backlight_enable(dbidev->backlight);
+ out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs ili9486_crtc_helper_funcs = {
+	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,
+	.atomic_enable = ili9486_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs ili9486_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs ili9486_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs ili9486_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs ili9486_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs ili9486_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs ili9486_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+static const struct drm_display_mode waveshare_mode = {
+	DRM_SIMPLE_MODE(480, 320, 73, 49),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(ili9486_fops);
+
+static const struct drm_driver ili9486_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &ili9486_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "ili9486",
+	.desc			= "Ilitek ILI9486",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id ili9486_of_match[] = {
+	{ .compatible = "waveshare,rpi-lcd-35" },
+	{ .compatible = "ozzmaker,piscreen" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ili9486_of_match);
+
+static const struct spi_device_id ili9486_id[] = {
+	{ "ili9486", 0 },
+	{ "rpi-lcd-35", 0 },
+	{ "piscreen", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ili9486_id);
+
+static int ili9486_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9486_device *ili9486;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *dc;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	u32 rotation = 0;
+	int ret;
+
+	ili9486 = devm_drm_dev_alloc(dev, &ili9486_driver, struct ili9486_device, dbidev.drm);
+	if (IS_ERR(ili9486))
+		return PTR_ERR(ili9486);
+	dbidev = &ili9486->dbidev;
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+
+	dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset))
+		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
+
+	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc))
+		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, dbi, dc);
+	if (ret)
+		return ret;
+
+	dbi->command = waveshare_command;
+	dbi->read_commands = NULL;
+
+	ret = drm_mipi_dbi_dev_init(dbidev, &waveshare_mode, ili9486_plane_formats[0],
+				    rotation, 0);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &ili9486_mode_config_funcs;
+	drm->mode_config.preferred_depth = 16;
+	drm->mode_config.helper_private = &ili9486_mode_config_helper_funcs;
+
+	plane = &ili9486->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &ili9486_plane_funcs,
+				       ili9486_plane_formats, ARRAY_SIZE(ili9486_plane_formats),
+				       ili9486_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &ili9486_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &ili9486->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &ili9486_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &ili9486_crtc_helper_funcs);
+
+	encoder = &ili9486->encoder;
+	ret = drm_encoder_init(drm, encoder, &ili9486_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &ili9486->connector;
+	ret = drm_connector_init(drm, connector, &ili9486_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &ili9486_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void ili9486_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void ili9486_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver ili9486_spi_driver = {
+	.driver = {
+		.name = "ili9486",
+		.of_match_table = ili9486_of_match,
+	},
+	.id_table = ili9486_id,
+	.probe = ili9486_probe,
+	.remove = ili9486_remove,
+	.shutdown = ili9486_shutdown,
+};
+module_spi_driver(ili9486_spi_driver);
+
+MODULE_DESCRIPTION("Ilitek ILI9486 DRM driver");
+MODULE_AUTHOR("Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/mi0283qt.c b/drivers/gpu/drm/tiny/mi0283qt.c
new file mode 100644
index 000000000..b0121e89e
--- /dev/null
+++ b/drivers/gpu/drm/tiny/mi0283qt.c
@@ -0,0 +1,390 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DRM driver for Multi-Inno MI0283QT panels
+ *
+ * Copyright 2016 Noralf Trønnes
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_print.h>
+#include <video/mipi_display.h>
+
+#define ILI9341_FRMCTR1		0xb1
+#define ILI9341_DISCTRL		0xb6
+#define ILI9341_ETMOD		0xb7
+
+#define ILI9341_PWCTRL1		0xc0
+#define ILI9341_PWCTRL2		0xc1
+#define ILI9341_VMCTRL1		0xc5
+#define ILI9341_VMCTRL2		0xc7
+#define ILI9341_PWCTRLA		0xcb
+#define ILI9341_PWCTRLB		0xcf
+
+#define ILI9341_PGAMCTRL	0xe0
+#define ILI9341_NGAMCTRL	0xe1
+#define ILI9341_DTCTRLA		0xe8
+#define ILI9341_DTCTRLB		0xea
+#define ILI9341_PWRSEQ		0xed
+
+#define ILI9341_EN3GAM		0xf2
+#define ILI9341_PUMPCTRL	0xf7
+
+#define ILI9341_MADCTL_BGR	BIT(3)
+#define ILI9341_MADCTL_MV	BIT(5)
+#define ILI9341_MADCTL_MX	BIT(6)
+#define ILI9341_MADCTL_MY	BIT(7)
+
+struct mi0283qt_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct mi0283qt_device *to_mi0283qt_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct mi0283qt_device, dbidev);
+}
+
+static const u32 mi0283qt_plane_formats[] = {
+	DRM_MIPI_DBI_PLANE_FORMATS,
+};
+
+static const u64 mi0283qt_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs mi0283qt_plane_helper_funcs = {
+	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs mi0283qt_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void mi0283qt_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					       struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct mi0283qt_device *mi0283qt = to_mi0283qt_device(drm);
+	struct mipi_dbi_dev *dbidev = &mi0283qt->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
+
+	mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
+	mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
+	mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
+	mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+	mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
+	mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
+
+	/* Power Control */
+	mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x26);
+	mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x11);
+	/* VCOM */
+	mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x35, 0x3e);
+	mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0xbe);
+
+	/* Memory Access Control */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
+
+	/* Frame Rate */
+	mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
+
+	/* Gamma */
+	mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x08);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+	mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
+		       0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
+		       0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
+	mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
+		       0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
+		       0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
+
+	/* DDRAM */
+	mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
+
+	/* Display */
+	mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(100);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+out_enable:
+	/* The PiTFT (ili9340) has a hardware reset circuit that
+	 * resets only on power-on and not on each reboot through
+	 * a gpio like the rpi-display does.
+	 * As a result, we need to always apply the rotation value
+	 * regardless of the display "on/off" state.
+	 */
+	switch (dbidev->rotation) {
+	default:
+		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+			    ILI9341_MADCTL_MX;
+		break;
+	case 90:
+		addr_mode = ILI9341_MADCTL_MY;
+		break;
+	case 180:
+		addr_mode = ILI9341_MADCTL_MV;
+		break;
+	case 270:
+		addr_mode = ILI9341_MADCTL_MX;
+		break;
+	}
+	addr_mode |= ILI9341_MADCTL_BGR;
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+	backlight_enable(dbidev->backlight);
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs mi0283qt_crtc_helper_funcs = {
+	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,
+	.atomic_enable = mi0283qt_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs mi0283qt_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs mi0283qt_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs mi0283qt_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs mi0283qt_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs mi0283qt_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs mi0283qt_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+static const struct drm_display_mode mi0283qt_mode = {
+	DRM_SIMPLE_MODE(320, 240, 58, 43),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(mi0283qt_fops);
+
+static const struct drm_driver mi0283qt_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &mi0283qt_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "mi0283qt",
+	.desc			= "Multi-Inno MI0283QT",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id mi0283qt_of_match[] = {
+	{ .compatible = "multi-inno,mi0283qt" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
+
+static const struct spi_device_id mi0283qt_id[] = {
+	{ "mi0283qt", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, mi0283qt_id);
+
+static int mi0283qt_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct mi0283qt_device *mi0283qt;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *dc;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	u32 rotation = 0;
+	int ret;
+
+	mi0283qt = devm_drm_dev_alloc(dev, &mi0283qt_driver, struct mi0283qt_device, dbidev.drm);
+	if (IS_ERR(mi0283qt))
+		return PTR_ERR(mi0283qt);
+	dbidev = &mi0283qt->dbidev;
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+
+	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset))
+		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
+
+	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc))
+		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
+
+	dbidev->regulator = devm_regulator_get(dev, "power");
+	if (IS_ERR(dbidev->regulator))
+		return PTR_ERR(dbidev->regulator);
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, dbi, dc);
+	if (ret)
+		return ret;
+
+	ret = drm_mipi_dbi_dev_init(dbidev, &mi0283qt_mode, mi0283qt_plane_formats[0],
+				    rotation, 0);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &mi0283qt_mode_config_funcs;
+	drm->mode_config.preferred_depth = 16;
+	drm->mode_config.helper_private = &mi0283qt_mode_config_helper_funcs;
+
+	plane = &mi0283qt->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &mi0283qt_plane_funcs,
+				       mi0283qt_plane_formats, ARRAY_SIZE(mi0283qt_plane_formats),
+				       mi0283qt_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &mi0283qt_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &mi0283qt->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &mi0283qt_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &mi0283qt_crtc_helper_funcs);
+
+	encoder = &mi0283qt->encoder;
+	ret = drm_encoder_init(drm, encoder, &mi0283qt_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &mi0283qt->connector;
+	ret = drm_connector_init(drm, connector, &mi0283qt_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &mi0283qt_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void mi0283qt_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void mi0283qt_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
+{
+	return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
+}
+
+static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
+{
+	drm_mode_config_helper_resume(dev_get_drvdata(dev));
+
+	return 0;
+}
+
+static const struct dev_pm_ops mi0283qt_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
+};
+
+static struct spi_driver mi0283qt_spi_driver = {
+	.driver = {
+		.name = "mi0283qt",
+		.of_match_table = mi0283qt_of_match,
+		.pm = &mi0283qt_pm_ops,
+	},
+	.id_table = mi0283qt_id,
+	.probe = mi0283qt_probe,
+	.remove = mi0283qt_remove,
+	.shutdown = mi0283qt_shutdown,
+};
+module_spi_driver(mi0283qt_spi_driver);
+
+MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
+MODULE_AUTHOR("Noralf Trønnes");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/panel-mipi-dbi.c b/drivers/gpu/drm/tiny/panel-mipi-dbi.c
new file mode 100644
index 000000000..60cd65cae
--- /dev/null
+++ b/drivers/gpu/drm/tiny/panel-mipi-dbi.c
@@ -0,0 +1,565 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DRM driver for MIPI DBI compatible display panels
+ *
+ * Copyright 2022 Noralf Trønnes
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_print.h>
+
+#include <video/mipi_display.h>
+
+struct panel_mipi_dbi_format {
+	const char *name;
+	u32 fourcc;
+	unsigned int bpp;
+};
+
+static const struct panel_mipi_dbi_format panel_mipi_dbi_formats[] = {
+	{ "r5g6b5", DRM_FORMAT_RGB565, 16 },
+	{ "b6x2g6x2r6x2", DRM_FORMAT_RGB888, 24 },
+};
+
+static int panel_mipi_dbi_get_format(struct device *dev, u32 *formats, unsigned int *bpp)
+{
+	const char *format_name;
+	unsigned int i;
+	int ret;
+
+	formats[1] = DRM_FORMAT_XRGB8888;
+
+	ret = device_property_read_string(dev, "format", &format_name);
+	if (ret) {
+		/* Old Device Trees don't have this property */
+		formats[0] = DRM_FORMAT_RGB565;
+		*bpp = 16;
+		return 0;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(panel_mipi_dbi_formats); i++) {
+		const struct panel_mipi_dbi_format *format = &panel_mipi_dbi_formats[i];
+
+		if (strcmp(format_name, format->name))
+			continue;
+
+		formats[0] = format->fourcc;
+		*bpp = format->bpp;
+		return 0;
+	}
+
+	dev_err(dev, "Pixel format is not supported: '%s'\n", format_name);
+
+	return -EINVAL;
+}
+
+static const u8 panel_mipi_dbi_magic[15] = { 'M', 'I', 'P', 'I', ' ', 'D', 'B', 'I',
+					     0, 0, 0, 0, 0, 0, 0 };
+
+/*
+ * The display controller configuration is stored in a firmware file.
+ * The Device Tree 'compatible' property value with a '.bin' suffix is passed
+ * to request_firmware() to fetch this file.
+ */
+struct panel_mipi_dbi_config {
+	/* Magic string: panel_mipi_dbi_magic */
+	u8 magic[15];
+
+	/* Config file format version */
+	u8 file_format_version;
+
+	/*
+	 * MIPI commands to execute when the display pipeline is enabled.
+	 * This is used to configure the display controller.
+	 *
+	 * The commands are stored in a byte array with the format:
+	 *     command, num_parameters, [ parameter, ...], command, ...
+	 *
+	 * Some commands require a pause before the next command can be received.
+	 * Inserting a delay in the command sequence is done by using the NOP command with one
+	 * parameter: delay in miliseconds (the No Operation command is part of the MIPI Display
+	 * Command Set where it has no parameters).
+	 *
+	 * Example:
+	 *     command 0x11
+	 *     sleep 120ms
+	 *     command 0xb1 parameters 0x01, 0x2c, 0x2d
+	 *     command 0x29
+	 *
+	 * Byte sequence:
+	 *     0x11 0x00
+	 *     0x00 0x01 0x78
+	 *     0xb1 0x03 0x01 0x2c 0x2d
+	 *     0x29 0x00
+	 */
+	u8 commands[];
+};
+
+struct panel_mipi_dbi_commands {
+	const u8 *buf;
+	size_t len;
+};
+
+static struct panel_mipi_dbi_commands *
+panel_mipi_dbi_check_commands(struct device *dev, const struct firmware *fw)
+{
+	const struct panel_mipi_dbi_config *config = (struct panel_mipi_dbi_config *)fw->data;
+	struct panel_mipi_dbi_commands *commands;
+	size_t size = fw->size, commands_len;
+	unsigned int i = 0;
+
+	if (size < sizeof(*config) + 2) { /* At least 1 command */
+		dev_err(dev, "config: file size=%zu is too small\n", size);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (memcmp(config->magic, panel_mipi_dbi_magic, sizeof(config->magic))) {
+		dev_err(dev, "config: Bad magic: %15ph\n", config->magic);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (config->file_format_version != 1) {
+		dev_err(dev, "config: version=%u is not supported\n", config->file_format_version);
+		return ERR_PTR(-EINVAL);
+	}
+
+	drm_dev_dbg(dev, DRM_UT_DRIVER, "size=%zu version=%u\n", size, config->file_format_version);
+
+	commands_len = size - sizeof(*config);
+
+	while ((i + 1) < commands_len) {
+		u8 command = config->commands[i++];
+		u8 num_parameters = config->commands[i++];
+		const u8 *parameters = &config->commands[i];
+
+		i += num_parameters;
+		if (i > commands_len) {
+			dev_err(dev, "config: command=0x%02x num_parameters=%u overflows\n",
+				command, num_parameters);
+			return ERR_PTR(-EINVAL);
+		}
+
+		if (command == 0x00 && num_parameters == 1)
+			drm_dev_dbg(dev, DRM_UT_DRIVER, "sleep %ums\n", parameters[0]);
+		else
+			drm_dev_dbg(dev, DRM_UT_DRIVER, "command %02x %*ph\n",
+				    command, num_parameters, parameters);
+	}
+
+	if (i != commands_len) {
+		dev_err(dev, "config: malformed command array\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	commands = devm_kzalloc(dev, sizeof(*commands), GFP_KERNEL);
+	if (!commands)
+		return ERR_PTR(-ENOMEM);
+
+	commands->len = commands_len;
+	commands->buf = devm_kmemdup(dev, config->commands, commands->len, GFP_KERNEL);
+	if (!commands->buf)
+		return ERR_PTR(-ENOMEM);
+
+	return commands;
+}
+
+static struct panel_mipi_dbi_commands *panel_mipi_dbi_commands_from_fw(struct device *dev)
+{
+	struct panel_mipi_dbi_commands *commands;
+	const struct firmware *fw;
+	const char *compatible;
+	char fw_name[40];
+	int ret;
+
+	ret = of_property_read_string_index(dev->of_node, "compatible", 0, &compatible);
+	if (ret)
+		return ERR_PTR(ret);
+
+	snprintf(fw_name, sizeof(fw_name), "%s.bin", compatible);
+	ret = request_firmware(&fw, fw_name, dev);
+	if (ret) {
+		dev_err(dev, "No config file found for compatible '%s' (error=%d)\n",
+			compatible, ret);
+
+		return ERR_PTR(ret);
+	}
+
+	commands = panel_mipi_dbi_check_commands(dev, fw);
+	release_firmware(fw);
+
+	return commands;
+}
+
+static void panel_mipi_dbi_commands_execute(struct mipi_dbi *dbi,
+					    struct panel_mipi_dbi_commands *commands)
+{
+	unsigned int i = 0;
+
+	if (!commands)
+		return;
+
+	while (i < commands->len) {
+		u8 command = commands->buf[i++];
+		u8 num_parameters = commands->buf[i++];
+		const u8 *parameters = &commands->buf[i];
+
+		if (command == 0x00 && num_parameters == 1)
+			msleep(parameters[0]);
+		else if (num_parameters)
+			mipi_dbi_command_stackbuf(dbi, command, parameters, num_parameters);
+		else
+			mipi_dbi_command(dbi, command);
+
+		i += num_parameters;
+	}
+}
+
+struct panel_mipi_dbi_device {
+	struct mipi_dbi_dev dbidev;
+
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+static struct panel_mipi_dbi_device *to_panel_mipi_dbi_device(struct drm_device *dev)
+{
+	return container_of(drm_to_mipi_dbi_dev(dev), struct panel_mipi_dbi_device, dbidev);
+}
+
+static const u64 panel_mipi_dbi_plane_format_modifiers[] = {
+	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,
+};
+
+static const struct drm_plane_helper_funcs panel_mipi_dbi_plane_helper_funcs = {
+	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs panel_mipi_dbi_plane_funcs = {
+	DRM_MIPI_DBI_PLANE_FUNCS,
+	.destroy = drm_plane_cleanup,
+};
+
+static void panel_mipi_dbi_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+						     struct drm_atomic_commit *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct panel_mipi_dbi_device *panel_mipi_dbi = to_panel_mipi_dbi_device(drm);
+	struct mipi_dbi_dev *dbidev = &panel_mipi_dbi->dbidev;
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	int ret, idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	drm_dbg(drm, "\n");
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (!ret)
+		panel_mipi_dbi_commands_execute(dbi, dbidev->driver_private);
+
+	backlight_enable(dbidev->backlight);
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs panel_mipi_dbi_crtc_helper_funcs = {
+	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,
+	.atomic_enable = panel_mipi_dbi_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs panel_mipi_dbi_crtc_funcs = {
+	DRM_MIPI_DBI_CRTC_FUNCS,
+	.destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_encoder_funcs panel_mipi_dbi_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_helper_funcs panel_mipi_dbi_connector_helper_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,
+};
+
+static const struct drm_connector_funcs panel_mipi_dbi_connector_funcs = {
+	DRM_MIPI_DBI_CONNECTOR_FUNCS,
+	.destroy = drm_connector_cleanup,
+};
+
+static const struct drm_mode_config_helper_funcs panel_mipi_dbi_mode_config_helper_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,
+};
+
+static const struct drm_mode_config_funcs panel_mipi_dbi_mode_config_funcs = {
+	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(panel_mipi_dbi_fops);
+
+static const struct drm_driver panel_mipi_dbi_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &panel_mipi_dbi_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "panel-mipi-dbi",
+	.desc			= "MIPI DBI compatible display panel",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static int panel_mipi_dbi_get_mode(struct mipi_dbi_dev *dbidev, struct drm_display_mode *mode)
+{
+	struct device *dev = dbidev->drm.dev;
+	u16 hback_porch, vback_porch;
+	int ret;
+
+	ret = of_get_drm_panel_display_mode(dev->of_node, mode, NULL);
+	if (ret) {
+		dev_err(dev, "%pOF: failed to get panel-timing (error=%d)\n", dev->of_node, ret);
+		return ret;
+	}
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+	hback_porch = mode->htotal - mode->hsync_end;
+	vback_porch = mode->vtotal - mode->vsync_end;
+
+	/*
+	 * Make sure width and height are set and that only back porch and
+	 * pixelclock are set in the other timing values. Also check that
+	 * width and height don't exceed the 16-bit value specified by MIPI DCS.
+	 */
+	if (!mode->hdisplay || !mode->vdisplay || mode->flags ||
+	    mode->hsync_end > mode->hdisplay || (hback_porch + mode->hdisplay) > 0xffff ||
+	    mode->vsync_end > mode->vdisplay || (vback_porch + mode->vdisplay) > 0xffff) {
+		dev_err(dev, "%pOF: panel-timing out of bounds\n", dev->of_node);
+		return -EINVAL;
+	}
+
+	/* The driver doesn't use the pixel clock but it is mandatory so fake one if not set */
+	if (!mode->clock)
+		mode->clock = mode->htotal * mode->vtotal * 60 / 1000;
+
+	dbidev->top_offset = vback_porch;
+	dbidev->left_offset = hback_porch;
+
+	return 0;
+}
+
+static int panel_mipi_dbi_spi_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct panel_mipi_dbi_device *panel_mipi_dbi;
+	struct mipi_dbi_dev *dbidev;
+	struct drm_device *drm;
+	struct drm_display_mode mode;
+	struct mipi_dbi *dbi;
+	struct gpio_desc *dc;
+	unsigned int bpp;
+	size_t buf_size;
+	u32 formats[2];
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	int ret;
+
+	panel_mipi_dbi = devm_drm_dev_alloc(dev, &panel_mipi_dbi_driver,
+					    struct panel_mipi_dbi_device,
+					    dbidev.drm);
+	if (IS_ERR(panel_mipi_dbi))
+		return PTR_ERR(panel_mipi_dbi);
+	dbidev = &panel_mipi_dbi->dbidev;
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+
+	ret = panel_mipi_dbi_get_mode(dbidev, &mode);
+	if (ret)
+		return ret;
+
+	dbidev->regulator = devm_regulator_get(dev, "power");
+	if (IS_ERR(dbidev->regulator))
+		return dev_err_probe(dev, PTR_ERR(dbidev->regulator),
+				     "Failed to get regulator 'power'\n");
+
+	dbidev->io_regulator = devm_regulator_get(dev, "io");
+	if (IS_ERR(dbidev->io_regulator))
+		return dev_err_probe(dev, PTR_ERR(dbidev->io_regulator),
+				     "Failed to get regulator 'io'\n");
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return dev_err_probe(dev, PTR_ERR(dbidev->backlight), "Failed to get backlight\n");
+
+	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(dbi->reset))
+		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
+
+	/* Multiple panels can share the "dc" GPIO, but only if they are on the same SPI bus! */
+	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
+	if (IS_ERR(dc))
+		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
+
+	ret = mipi_dbi_spi_init(spi, dbi, dc);
+	if (ret)
+		return ret;
+
+	if (device_property_present(dev, "write-only"))
+		dbi->read_commands = NULL;
+
+	dbidev->driver_private = panel_mipi_dbi_commands_from_fw(dev);
+	if (IS_ERR(dbidev->driver_private))
+		return PTR_ERR(dbidev->driver_private);
+
+	ret = panel_mipi_dbi_get_format(dev, formats, &bpp);
+	if (ret)
+		return ret;
+
+	buf_size = DIV_ROUND_UP(mode.hdisplay * mode.vdisplay * bpp, 8);
+	ret = drm_mipi_dbi_dev_init(dbidev, &mode, formats[0], 0, buf_size);
+	if (ret)
+		return ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = dbidev->mode.hdisplay;
+	drm->mode_config.max_width = dbidev->mode.hdisplay;
+	drm->mode_config.min_height = dbidev->mode.vdisplay;
+	drm->mode_config.max_height = dbidev->mode.vdisplay;
+	drm->mode_config.funcs = &panel_mipi_dbi_mode_config_funcs;
+	drm->mode_config.preferred_depth = bpp;
+	drm->mode_config.helper_private = &panel_mipi_dbi_mode_config_helper_funcs;
+
+	plane = &panel_mipi_dbi->plane;
+	ret = drm_universal_plane_init(drm, plane, 0, &panel_mipi_dbi_plane_funcs,
+				       formats, ARRAY_SIZE(formats),
+				       panel_mipi_dbi_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(plane, &panel_mipi_dbi_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(plane);
+
+	crtc = &panel_mipi_dbi->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &panel_mipi_dbi_crtc_funcs,
+					NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &panel_mipi_dbi_crtc_helper_funcs);
+
+	encoder = &panel_mipi_dbi->encoder;
+	ret = drm_encoder_init(drm, encoder, &panel_mipi_dbi_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &panel_mipi_dbi->connector;
+	ret = drm_connector_init(drm, connector, &panel_mipi_dbi_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &panel_mipi_dbi_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	if (bpp == 16)
+		drm_client_setup_with_fourcc(drm, DRM_FORMAT_RGB565);
+	else
+		drm_client_setup_with_fourcc(drm, DRM_FORMAT_RGB888);
+
+	return 0;
+}
+
+static void panel_mipi_dbi_spi_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void panel_mipi_dbi_spi_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static int __maybe_unused panel_mipi_dbi_pm_suspend(struct device *dev)
+{
+	return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
+}
+
+static int __maybe_unused panel_mipi_dbi_pm_resume(struct device *dev)
+{
+	drm_mode_config_helper_resume(dev_get_drvdata(dev));
+
+	return 0;
+}
+
+static const struct dev_pm_ops panel_mipi_dbi_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(panel_mipi_dbi_pm_suspend, panel_mipi_dbi_pm_resume)
+};
+
+static const struct of_device_id panel_mipi_dbi_spi_of_match[] = {
+	{ .compatible = "panel-mipi-dbi-spi" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, panel_mipi_dbi_spi_of_match);
+
+static const struct spi_device_id panel_mipi_dbi_spi_id[] = {
+	{ "panel-mipi-dbi-spi", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, panel_mipi_dbi_spi_id);
+
+static struct spi_driver panel_mipi_dbi_spi_driver = {
+	.driver = {
+		.name = "panel-mipi-dbi-spi",
+		.of_match_table = panel_mipi_dbi_spi_of_match,
+		.pm = &panel_mipi_dbi_pm_ops,
+	},
+	.id_table = panel_mipi_dbi_spi_id,
+	.probe = panel_mipi_dbi_spi_probe,
+	.remove = panel_mipi_dbi_spi_remove,
+	.shutdown = panel_mipi_dbi_spi_shutdown,
+};
+module_spi_driver(panel_mipi_dbi_spi_driver);
+
+MODULE_DESCRIPTION("MIPI DBI compatible display panel driver");
+MODULE_AUTHOR("Noralf Trønnes");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/pixpaper.c b/drivers/gpu/drm/tiny/pixpaper.c
new file mode 100644
index 000000000..d02ac26d0
--- /dev/null
+++ b/drivers/gpu/drm/tiny/pixpaper.c
@@ -0,0 +1,1166 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DRM driver for PIXPAPER e-ink panel
+ *
+ * Author: LiangCheng Wang <zaq14760@gmail.com>,
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_shmem.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+/*
+ * Note on Undocumented Commands/Registers:
+ *
+ * Several commands and register parameters defined in this header are not
+ * documented in the datasheet. Their values and usage have been derived
+ * through analysis of existing userspace example programs.
+ *
+ * These 'unknown' definitions are crucial for the proper initialization
+ * and stable operation of the panel. Modifying these values without
+ * thorough understanding may lead to display anomalies, panel damage,
+ * or unexpected behavior.
+ */
+
+/* Command definitions */
+#define PIXPAPER_CMD_PANEL_SETTING 0x00	/* R00H: Panel settings */
+#define PIXPAPER_CMD_POWER_SETTING 0x01	/* R01H: Power settings */
+#define PIXPAPER_CMD_POWER_OFF 0x02		/* R02H: Power off */
+#define PIXPAPER_CMD_POWER_OFF_SEQUENCE 0x03	/* R03H: Power off sequence */
+#define PIXPAPER_CMD_POWER_ON 0x04		/* R04H: Power on */
+#define PIXPAPER_CMD_BOOSTER_SOFT_START 0x06	/* R06H: Booster soft start */
+#define PIXPAPER_CMD_DEEP_SLEEP 0x07		/* R07H: Deep sleep */
+#define PIXPAPER_CMD_DATA_START_TRANSMISSION 0x10
+/* R10H: Data transmission start */
+#define PIXPAPER_CMD_DISPLAY_REFRESH 0x12	/* R12H: Display refresh */
+#define PIXPAPER_CMD_PLL_CONTROL 0x30		/* R30H: PLL control */
+#define PIXPAPER_CMD_TEMP_SENSOR_CALIB 0x41
+/* R41H: Temperature sensor calibration */
+#define PIXPAPER_CMD_UNKNOWN_4D 0x4D		/* R4DH: Unknown command */
+#define PIXPAPER_CMD_VCOM_INTERVAL 0x50	/* R50H: VCOM interval */
+#define PIXPAPER_CMD_UNKNOWN_60 0x60		/* R60H: Unknown command */
+#define PIXPAPER_CMD_RESOLUTION_SETTING 0x61	/* R61H: Resolution settings */
+#define PIXPAPER_CMD_GATE_SOURCE_START 0x65	/* R65H: Gate/source start */
+#define PIXPAPER_CMD_UNKNOWN_B4 0xB4		/* RB4H: Unknown command */
+#define PIXPAPER_CMD_UNKNOWN_B5 0xB5		/* RB5H: Unknown command */
+#define PIXPAPER_CMD_UNKNOWN_E0 0xE0		/* RE0H: Unknown command */
+#define PIXPAPER_CMD_POWER_SAVING 0xE3		/* RE3H: Power saving */
+#define PIXPAPER_CMD_UNKNOWN_E7 0xE7		/* RE7H: Unknown command */
+#define PIXPAPER_CMD_UNKNOWN_E9 0xE9		/* RE9H: Unknown command */
+
+/* R00H PSR - First Parameter */
+#define PIXPAPER_PSR_RST_N BIT(0)
+/* Bit 0: RST_N, 1=no effect (default), 0=reset with booster OFF */
+#define PIXPAPER_PSR_SHD_N BIT(1)
+/* Bit 1: SHD_N, 1=booster ON (default), 0=booster OFF */
+#define PIXPAPER_PSR_SHL BIT(2)
+/* Bit 2: SHL, 1=shift right (default), 0=shift left */
+#define PIXPAPER_PSR_UD BIT(3)
+/* Bit 3: UD, 1=scan up (default), 0=scan down */
+#define PIXPAPER_PSR_PST_MODE BIT(5)
+/* Bit 5: PST_MODE, 0=frame scanning (default), 1=external */
+#define PIXPAPER_PSR_RES_MASK (3 << 6)
+/* Bits 7-6: RES[1:0], resolution setting */
+#define PIXPAPER_PSR_RES_176x296 (0x0 << 6)	/* 00: 176x296 */
+#define PIXPAPER_PSR_RES_128x296 (0x1 << 6)	/* 01: 128x296 */
+#define PIXPAPER_PSR_RES_128x250 (0x2 << 6)	/* 10: 128x250 */
+#define PIXPAPER_PSR_RES_112x204 (0x3 << 6)	/* 11: 112x204 */
+#define PIXPAPER_PSR_CONFIG                                           \
+	(PIXPAPER_PSR_RST_N | PIXPAPER_PSR_SHD_N | PIXPAPER_PSR_SHL | \
+	 PIXPAPER_PSR_UD)
+/* 0x0F: Default settings, resolution set by R61H */
+
+/* R00H PSR - Second Parameter */
+#define PIXPAPER_PSR2_VC_LUTZ \
+	(1 << 0) /* Bit 0: VC_LUTZ, 1=VCOM float after refresh (default), 0=no effect */
+#define PIXPAPER_PSR2_NORG \
+	(1 << 1) /* Bit 1: NORG, 1=VCOM to GND before power off, 0=no effect (default) */
+#define PIXPAPER_PSR2_TIEG \
+	(1 << 2) /* Bit 2: TIEG, 1=VGN to GND on power off, 0=no effect (default) */
+#define PIXPAPER_PSR2_TS_AUTO \
+	(1 << 3) /* Bit 3: TS_AUTO, 1=sensor on RST_N low to high (default), 0=on booster */
+#define PIXPAPER_PSR2_VCMZ \
+	(1 << 4) /* Bit 4: VCMZ, 1=VCOM always floating, 0=no effect (default) */
+#define PIXPAPER_PSR2_FOPT \
+	(1 << 5) /* Bit 5: FOPT, 0=scan 1 frame (default), 1=no scan, HiZ */
+#define PIXPAPER_PSR_CONFIG2     \
+	(PIXPAPER_PSR2_VC_LUTZ | \
+	 PIXPAPER_PSR2_TS_AUTO) /* 0x09: Default VCOM and temp sensor settings */
+
+/* R01H PWR - Power Setting Register */
+/* First Parameter */
+#define PIXPAPER_PWR_VDG_EN \
+	(1 << 0) /* Bit 0: VDG_EN, 1=internal DCDC for VGP/VGN (default), 0=external */
+#define PIXPAPER_PWR_VDS_EN \
+	(1 << 1) /* Bit 1: VDS_EN, 1=internal regulator for VSP/VSN (default), 0=external */
+#define PIXPAPER_PWR_VSC_EN \
+	(1 << 2) /* Bit 2: VSC_EN, 1=internal regulator for VSPL (default), 0=external */
+#define PIXPAPER_PWR_V_MODE \
+	(1 << 3) /* Bit 3: V_MODE, 0=Mode0 (default), 1=Mode1 */
+#define PIXPAPER_PWR_CONFIG1                         \
+	(PIXPAPER_PWR_VDG_EN | PIXPAPER_PWR_VDS_EN | \
+	 PIXPAPER_PWR_VSC_EN) /* 0x07: Internal power for VGP/VGN, VSP/VSN, VSPL */
+
+/* Second Parameter */
+#define PIXPAPER_PWR_VGPN_MASK \
+	(3 << 0) /* Bits 1-0: VGPN, VGP/VGN voltage levels */
+#define PIXPAPER_PWR_VGPN_20V (0x0 << 0) /* 00: VGP=20V, VGN=-20V (default) */
+#define PIXPAPER_PWR_VGPN_17V (0x1 << 0) /* 01: VGP=17V, VGN=-17V */
+#define PIXPAPER_PWR_VGPN_15V (0x2 << 0) /* 10: VGP=15V, VGN=-15V */
+#define PIXPAPER_PWR_VGPN_10V (0x3 << 0) /* 11: VGP=10V, VGN=-10V */
+#define PIXPAPER_PWR_CONFIG2 PIXPAPER_PWR_VGPN_20V /* 0x00: VGP=20V, VGN=-20V */
+
+/* Third, Fourth, Sixth Parameters (VSP_1, VSPL_0, VSPL_1) */
+#define PIXPAPER_PWR_VSP_8_2V 0x22 /* VSP_1/VSPL_1: 8.2V (34 decimal) */
+#define PIXPAPER_PWR_VSPL_15V 0x78 /* VSPL_0: 15V (120 decimal) */
+
+/* Fifth Parameter (VSN_1) */
+#define PIXPAPER_PWR_VSN_4V 0x0A /* VSN_1: -4V (10 decimal) */
+
+/* R03H PFS - Power Off Sequence Setting Register */
+/* First Parameter */
+#define PIXPAPER_PFS_T_VDS_OFF_MASK \
+	(3 << 0) /* Bits 1-0: T_VDS_OFF, VSP/VSN power-off sequence */
+#define PIXPAPER_PFS_T_VDS_OFF_20MS (0x0 << 0) /* 00: 20 ms (default) */
+#define PIXPAPER_PFS_T_VDS_OFF_40MS (0x1 << 0) /* 01: 40 ms */
+#define PIXPAPER_PFS_T_VDS_OFF_60MS (0x2 << 0) /* 10: 60 ms */
+#define PIXPAPER_PFS_T_VDS_OFF_80MS (0x3 << 0) /* 11: 80 ms */
+#define PIXPAPER_PFS_T_VDPG_OFF_MASK \
+	(3 << 4) /* Bits 5-4: T_VDPG_OFF, VGP/VGN power-off sequence */
+#define PIXPAPER_PFS_T_VDPG_OFF_20MS (0x0 << 4) /* 00: 20 ms (default) */
+#define PIXPAPER_PFS_T_VDPG_OFF_40MS (0x1 << 4) /* 01: 40 ms */
+#define PIXPAPER_PFS_T_VDPG_OFF_60MS (0x2 << 4) /* 10: 60 ms */
+#define PIXPAPER_PFS_T_VDPG_OFF_80MS (0x3 << 4) /* 11: 80 ms */
+#define PIXPAPER_PFS_CONFIG1           \
+	(PIXPAPER_PFS_T_VDS_OFF_20MS | \
+	 PIXPAPER_PFS_T_VDPG_OFF_20MS) /* 0x10: Default 20 ms for VSP/VSN and VGP/VGN */
+
+/* Second Parameter */
+#define PIXPAPER_PFS_VGP_EXT_MASK \
+	(0xF << 0) /* Bits 3-0: VGP_EXT, VGP extension time */
+#define PIXPAPER_PFS_VGP_EXT_0MS (0x0 << 0) /* 0000: 0 ms */
+#define PIXPAPER_PFS_VGP_EXT_500MS (0x1 << 0) /* 0001: 500 ms */
+#define PIXPAPER_PFS_VGP_EXT_1000MS (0x2 << 0) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_VGP_EXT_1500MS (0x3 << 0) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_VGP_EXT_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */
+#define PIXPAPER_PFS_VGP_EXT_2500MS (0x5 << 0) /* 0101: 2500 ms */
+#define PIXPAPER_PFS_VGP_EXT_3000MS (0x6 << 0) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_VGP_EXT_3500MS (0x7 << 0) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_VGP_EXT_4000MS (0x8 << 0) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_VGP_EXT_4500MS (0x9 << 0) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_VGP_EXT_5000MS (0xA << 0) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_VGP_EXT_5500MS (0xB << 0) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_VGP_EXT_6000MS (0xC << 0) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_VGP_EXT_6500MS (0xD << 0) /* 1101: 6500 ms */
+#define PIXPAPER_PFS_VGP_LEN_MASK \
+	(0xF << 4) /* Bits 7-4: VGP_LEN, VGP at 10V during power-off */
+#define PIXPAPER_PFS_VGP_LEN_0MS (0x0 << 4) /* 0000: 0 ms */
+#define PIXPAPER_PFS_VGP_LEN_500MS (0x1 << 4) /* 0001: 500 ms */
+#define PIXPAPER_PFS_VGP_LEN_1000MS (0x2 << 4) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_VGP_LEN_1500MS (0x3 << 4) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_VGP_LEN_2000MS (0x4 << 4) /* 0100: 2000 ms */
+#define PIXPAPER_PFS_VGP_LEN_2500MS (0x5 << 4) /* 0101: 2500 ms (default) */
+#define PIXPAPER_PFS_VGP_LEN_3000MS (0x6 << 4) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_VGP_LEN_3500MS (0x7 << 4) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_VGP_LEN_4000MS (0x8 << 4) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_VGP_LEN_4500MS (0x9 << 4) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_VGP_LEN_5000MS (0xA << 4) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_VGP_LEN_5500MS (0xB << 4) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_VGP_LEN_6000MS (0xC << 4) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_VGP_LEN_6500MS (0xD << 4) /* 1101: 6500 ms */
+#define PIXPAPER_PFS_CONFIG2           \
+	(PIXPAPER_PFS_VGP_EXT_1000MS | \
+	 PIXPAPER_PFS_VGP_LEN_2500MS) /* 0x54: VGP extension 1000 ms, VGP at 10V for 2500 ms */
+
+/* Third Parameter */
+#define PIXPAPER_PFS_XON_LEN_MASK \
+	(0xF << 0) /* Bits 3-0: XON_LEN, XON enable time */
+#define PIXPAPER_PFS_XON_LEN_0MS (0x0 << 0) /* 0000: 0 ms */
+#define PIXPAPER_PFS_XON_LEN_500MS (0x1 << 0) /* 0001: 500 ms */
+#define PIXPAPER_PFS_XON_LEN_1000MS (0x2 << 0) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_XON_LEN_1500MS (0x3 << 0) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_XON_LEN_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */
+#define PIXPAPER_PFS_XON_LEN_2500MS (0x5 << 0) /* 0101: 2500 ms */
+#define PIXPAPER_PFS_XON_LEN_3000MS (0x6 << 0) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_XON_LEN_3500MS (0x7 << 0) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_XON_LEN_4000MS (0x8 << 0) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_XON_LEN_4500MS (0x9 << 0) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_XON_LEN_5000MS (0xA << 0) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_XON_LEN_5500MS (0xB << 0) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_XON_LEN_6000MS (0xC << 0) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_XON_DLY_MASK \
+	(0xF << 4) /* Bits 7-4: XON_DLY, XON delay time */
+#define PIXPAPER_PFS_XON_DLY_0MS (0x0 << 4) /* 0000: 0 ms */
+#define PIXPAPER_PFS_XON_DLY_500MS (0x1 << 4) /* 0001: 500 ms */
+#define PIXPAPER_PFS_XON_DLY_1000MS (0x2 << 4) /* 0010: 1000 ms */
+#define PIXPAPER_PFS_XON_DLY_1500MS (0x3 << 4) /* 0011: 1500 ms */
+#define PIXPAPER_PFS_XON_DLY_2000MS (0x4 << 4) /* 0100: 2000 ms (default) */
+#define PIXPAPER_PFS_XON_DLY_2500MS (0x5 << 4) /* 0101: 2500 ms */
+#define PIXPAPER_PFS_XON_DLY_3000MS (0x6 << 4) /* 0110: 3000 ms */
+#define PIXPAPER_PFS_XON_DLY_3500MS (0x7 << 4) /* 0111: 3500 ms */
+#define PIXPAPER_PFS_XON_DLY_4000MS (0x8 << 4) /* 1000: 4000 ms */
+#define PIXPAPER_PFS_XON_DLY_4500MS (0x9 << 4) /* 1001: 4500 ms */
+#define PIXPAPER_PFS_XON_DLY_5000MS (0xA << 4) /* 1010: 5000 ms */
+#define PIXPAPER_PFS_XON_DLY_5500MS (0xB << 4) /* 1011: 5500 ms */
+#define PIXPAPER_PFS_XON_DLY_6000MS (0xC << 4) /* 1100: 6000 ms */
+#define PIXPAPER_PFS_CONFIG3           \
+	(PIXPAPER_PFS_XON_LEN_2000MS | \
+	 PIXPAPER_PFS_XON_DLY_2000MS) /* 0x44: XON enable and delay at 2000 ms */
+
+/* R06H BTST - Booster Soft Start Command */
+/* First Parameter */
+#define PIXPAPER_BTST_PHA_SFT_MASK \
+	(3 << 0) /* Bits 1-0: PHA_SFT, soft start period for phase A */
+#define PIXPAPER_BTST_PHA_SFT_10MS (0x0 << 0) /* 00: 10 ms (default) */
+#define PIXPAPER_BTST_PHA_SFT_20MS (0x1 << 0) /* 01: 20 ms */
+#define PIXPAPER_BTST_PHA_SFT_30MS (0x2 << 0) /* 10: 30 ms */
+#define PIXPAPER_BTST_PHA_SFT_40MS (0x3 << 0) /* 11: 40 ms */
+#define PIXPAPER_BTST_PHB_SFT_MASK \
+	(3 << 2) /* Bits 3-2: PHB_SFT, soft start period for phase B */
+#define PIXPAPER_BTST_PHB_SFT_10MS (0x0 << 2) /* 00: 10 ms (default) */
+#define PIXPAPER_BTST_PHB_SFT_20MS (0x1 << 2) /* 01: 20 ms */
+#define PIXPAPER_BTST_PHB_SFT_30MS (0x2 << 2) /* 10: 30 ms */
+#define PIXPAPER_BTST_PHB_SFT_40MS (0x3 << 2) /* 11: 40 ms */
+#define PIXPAPER_BTST_CONFIG1         \
+	(PIXPAPER_BTST_PHA_SFT_40MS | \
+	 PIXPAPER_BTST_PHB_SFT_40MS) /* 0x0F: 40 ms for phase A and B */
+
+/* Second to Seventh Parameters (Driving Strength or Minimum OFF Time) */
+#define PIXPAPER_BTST_CONFIG2 0x0A /* Strength11 */
+#define PIXPAPER_BTST_CONFIG3 0x2F /* Period48 */
+#define PIXPAPER_BTST_CONFIG4 0x25 /* Strength38 */
+#define PIXPAPER_BTST_CONFIG5 0x22 /* Period35 */
+#define PIXPAPER_BTST_CONFIG6 0x2E /* Strength47 */
+#define PIXPAPER_BTST_CONFIG7 0x21 /* Period34 */
+
+/* R12H: DRF (Display Refresh) */
+#define PIXPAPER_DRF_VCOM_AC 0x00 /* AC VCOM: VCOM follows LUTC (default) */
+#define PIXPAPER_DRF_VCOM_DC 0x01 /* DC VCOM: VCOM fixed to VCOMDC */
+
+/* R30H PLL - PLL Control Register */
+/* First Parameter */
+#define PIXPAPER_PLL_FR_MASK (0x7 << 0) /* Bits 2-0: FR, frame rate */
+#define PIXPAPER_PLL_FR_12_5HZ (0x0 << 0) /* 000: 12.5 Hz */
+#define PIXPAPER_PLL_FR_25HZ (0x1 << 0)	/* 001: 25 Hz */
+#define PIXPAPER_PLL_FR_50HZ (0x2 << 0) /* 010: 50 Hz (default) */
+#define PIXPAPER_PLL_FR_65HZ (0x3 << 0) /* 011: 65 Hz */
+#define PIXPAPER_PLL_FR_75HZ (0x4 << 0) /* 100: 75 Hz */
+#define PIXPAPER_PLL_FR_85HZ (0x5 << 0) /* 101: 85 Hz */
+#define PIXPAPER_PLL_FR_100HZ (0x6 << 0) /* 110: 100 Hz */
+#define PIXPAPER_PLL_FR_120HZ (0x7 << 0) /* 111: 120 Hz */
+#define PIXPAPER_PLL_DFR \
+	(1 << 3) /* Bit 3: Dynamic frame rate, 0=disabled (default), 1=enabled */
+#define PIXPAPER_PLL_CONFIG \
+	(PIXPAPER_PLL_FR_50HZ) /* 0x02: 50 Hz, dynamic frame rate disabled */
+
+/* R41H TSE - Temperature Sensor Calibration Register */
+/* First Parameter */
+#define PIXPAPER_TSE_TO_MASK \
+	(0xF << 0) /* Bits 3-0: TO[3:0], temperature offset */
+#define PIXPAPER_TSE_TO_POS_0C (0x0 << 0) /* 0000: +0°C (default) */
+#define PIXPAPER_TSE_TO_POS_0_5C (0x1 << 0) /* 0001: +0.5°C */
+#define PIXPAPER_TSE_TO_POS_1C (0x2 << 0) /* 0010: +1°C */
+#define PIXPAPER_TSE_TO_POS_1_5C (0x3 << 0) /* 0011: +1.5°C */
+#define PIXPAPER_TSE_TO_POS_2C (0x4 << 0) /* 0100: +2°C */
+#define PIXPAPER_TSE_TO_POS_2_5C (0x5 << 0) /* 0101: +2.5°C */
+#define PIXPAPER_TSE_TO_POS_3C (0x6 << 0) /* 0110: +3°C */
+#define PIXPAPER_TSE_TO_POS_3_5C (0x7 << 0) /* 0111: +3.5°C */
+#define PIXPAPER_TSE_TO_NEG_4C (0x8 << 0) /* 1000: -4°C */
+#define PIXPAPER_TSE_TO_NEG_3_5C (0x9 << 0) /* 1001: -3.5°C */
+#define PIXPAPER_TSE_TO_NEG_3C (0xA << 0) /* 1010: -3°C */
+#define PIXPAPER_TSE_TO_NEG_2_5C (0xB << 0) /* 1011: -2.5°C */
+#define PIXPAPER_TSE_TO_NEG_2C (0xC << 0) /* 1100: -2°C */
+#define PIXPAPER_TSE_TO_NEG_1_5C (0xD << 0) /* 1101: -1.5°C */
+#define PIXPAPER_TSE_TO_NEG_1C (0xE << 0) /* 1110: -1°C */
+#define PIXPAPER_TSE_TO_NEG_0_5C (0xF << 0) /* 1111: -0.5°C */
+#define PIXPAPER_TSE_TO_FINE_MASK \
+	(0x3 << 4) /* Bits 5-4: TO[5:4], fine adjustment for positive offsets */
+#define PIXPAPER_TSE_TO_FINE_0C (0x0 << 4) /* 00: +0.0°C (default) */
+#define PIXPAPER_TSE_TO_FINE_0_25C (0x1 << 4) /* 01: +0.25°C */
+#define PIXPAPER_TSE_ENABLE \
+	(0 << 7) /* Bit 7: TSE, 0=internal sensor enabled (default), 1=disabled (external) */
+#define PIXPAPER_TSE_DISABLE \
+	(1 << 7) /* Bit 7: TSE, 1=internal sensor disabled, use external */
+#define PIXPAPER_TSE_CONFIG                                 \
+	(PIXPAPER_TSE_TO_POS_0C | PIXPAPER_TSE_TO_FINE_0C | \
+	 PIXPAPER_TSE_ENABLE) /* 0x00: Internal sensor enabled, +0°C offset */
+
+/* R4DH */
+#define PIXPAPER_UNKNOWN_4D_CONFIG \
+	0x78 /* This value is essential for initialization, derived from userspace examples. */
+
+/* R50H CDI - VCOM and DATA Interval Setting Register */
+/* First Parameter */
+#define PIXPAPER_CDI_INTERVAL_MASK \
+	(0xF << 0) /* Bits 3-0: CDI[3:0], VCOM and data interval (hsync) */
+#define PIXPAPER_CDI_17_HSYNC (0x0 << 0) /* 0000: 17 hsync */
+#define PIXPAPER_CDI_16_HSYNC (0x1 << 0) /* 0001: 16 hsync */
+#define PIXPAPER_CDI_15_HSYNC (0x2 << 0) /* 0010: 15 hsync */
+#define PIXPAPER_CDI_14_HSYNC (0x3 << 0) /* 0011: 14 hsync */
+#define PIXPAPER_CDI_13_HSYNC (0x4 << 0) /* 0100: 13 hsync */
+#define PIXPAPER_CDI_12_HSYNC (0x5 << 0) /* 0101: 12 hsync */
+#define PIXPAPER_CDI_11_HSYNC (0x6 << 0) /* 0110: 11 hsync */
+#define PIXPAPER_CDI_10_HSYNC (0x7 << 0) /* 0111: 10 hsync (default) */
+#define PIXPAPER_CDI_9_HSYNC (0x8 << 0) /* 1000: 9 hsync */
+#define PIXPAPER_CDI_8_HSYNC (0x9 << 0) /* 1001: 8 hsync */
+#define PIXPAPER_CDI_7_HSYNC (0xA << 0) /* 1010: 7 hsync */
+#define PIXPAPER_CDI_6_HSYNC (0xB << 0) /* 1011: 6 hsync */
+#define PIXPAPER_CDI_5_HSYNC (0xC << 0) /* 1100: 5 hsync */
+#define PIXPAPER_CDI_4_HSYNC (0xD << 0) /* 1101: 4 hsync */
+#define PIXPAPER_CDI_3_HSYNC (0xE << 0) /* 1110: 3 hsync */
+#define PIXPAPER_CDI_2_HSYNC (0xF << 0) /* 1111: 2 hsync */
+#define PIXPAPER_CDI_DDX \
+	(1 << 4) /* Bit 4: DDX, 0=grayscale mapping 0, 1=grayscale mapping 1 (default) */
+#define PIXPAPER_CDI_VBD_MASK \
+	(0x7 << 5) /* Bits 7-5: VBD[2:0], border data selection */
+#define PIXPAPER_CDI_VBD_FLOAT (0x0 << 5) /* 000: Floating (DDX=0 or 1) */
+#define PIXPAPER_CDI_VBD_GRAY3_DDX0 \
+	(0x1 << 5) /* 001: Gray3 (border_buf=011) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY2_DDX0 \
+	(0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY1_DDX0 \
+	(0x3 << 5) /* 011: Gray1 (border_buf=001) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY0_DDX0 \
+	(0x4 << 5) /* 100: Gray0 (border_buf=000) when DDX=0 */
+#define PIXPAPER_CDI_VBD_GRAY0_DDX1 \
+	(0x0 << 5) /* 000: Gray0 (border_buf=000) when DDX=1 */
+#define PIXPAPER_CDI_VBD_GRAY1_DDX1 \
+	(0x1 << 5) /* 001: Gray1 (border_buf=001) when DDX=1 */
+#define PIXPAPER_CDI_VBD_GRAY2_DDX1 \
+	(0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=1 */
+#define PIXPAPER_CDI_VBD_GRAY3_DDX1 \
+	(0x3 << 5) /* 011: Gray3 (border_buf=011) when DDX=1 */
+#define PIXPAPER_CDI_VBD_FLOAT_DDX1 (0x4 << 5) /* 100: Floating when DDX=1 */
+#define PIXPAPER_CDI_CONFIG                         \
+	(PIXPAPER_CDI_10_HSYNC | PIXPAPER_CDI_DDX | \
+	 PIXPAPER_CDI_VBD_GRAY1_DDX1) /* 0x37: 10 hsync, DDX=1, border Gray1 */
+
+/* R60H */
+#define PIXPAPER_UNKNOWN_60_CONFIG1 \
+	0x02 /* This value is essential for initialization, derived from userspace examples. */
+#define PIXPAPER_UNKNOWN_60_CONFIG2 \
+	0x02 /* This value is essential for initialization, derived from userspace examples. */
+
+/* R61H TRES - Resolution Setting Register */
+#define PIXPAPER_TRES_HRES_H                  \
+	((PIXPAPER_PANEL_BUFFER_WIDTH >> 8) & \
+	 0xFF) /* HRES[9:8]: High byte of horizontal resolution (128) */
+#define PIXPAPER_TRES_HRES_L           \
+	(PIXPAPER_PANEL_BUFFER_WIDTH & \
+	 0xFF) /* HRES[7:0]: Low byte of horizontal resolution (128 = 0x80) */
+#define PIXPAPER_TRES_VRES_H      \
+	((PIXPAPER_HEIGHT >> 8) & \
+	 0xFF) /* VRES[9:8]: High byte of vertical resolution (250) */
+#define PIXPAPER_TRES_VRES_L \
+	(PIXPAPER_HEIGHT &   \
+	 0xFF) /* VRES[7:0]: Low byte of vertical resolution (250 = 0xFA) */
+
+/* R65H GSST - Gate/Source Start Setting Register */
+#define PIXPAPER_GSST_S_START 0x00 /* S_Start[7:0]: First source line (S0) */
+#define PIXPAPER_GSST_RESERVED 0x00 /* Reserved byte */
+#define PIXPAPER_GSST_G_START_H \
+	0x00 /* G_Start[8]: High bit of first gate line (G0) */
+#define PIXPAPER_GSST_G_START_L \
+	0x00 /* G_Start[7:0]: Low byte of first gate line (G0) */
+
+/* RB4H */
+#define PIXPAPER_UNKNOWN_B4_CONFIG \
+	0xD0 /* This value is essential for initialization, derived from userspace examples. */
+
+/* RB5H */
+#define PIXPAPER_UNKNOWN_B5_CONFIG \
+	0x03 /* This value is essential for initialization, derived from userspace examples. */
+
+/* RE0H */
+#define PIXPAPER_UNKNOWN_E0_CONFIG \
+	0x00 /* This value is essential for initialization, derived from userspace examples. */
+
+/* RE3H PWS - Power Saving Register */
+/* First Parameter */
+#define PIXPAPER_PWS_VCOM_W_MASK \
+	(0xF                     \
+	 << 4) /* Bits 7-4: VCOM_W[3:0], VCOM power-saving width (line periods) */
+#define PIXPAPER_PWS_VCOM_W_0 (0x0 << 4) /* 0000: 0 line periods */
+#define PIXPAPER_PWS_VCOM_W_1 (0x1 << 4) /* 0001: 1 line period */
+#define PIXPAPER_PWS_VCOM_W_2 (0x2 << 4) /* 0010: 2 line periods */
+#define PIXPAPER_PWS_VCOM_W_3 (0x3 << 4) /* 0011: 3 line periods */
+#define PIXPAPER_PWS_VCOM_W_4 (0x4 << 4) /* 0100: 4 line periods */
+#define PIXPAPER_PWS_VCOM_W_5 (0x5 << 4) /* 0101: 5 line periods */
+#define PIXPAPER_PWS_VCOM_W_6 (0x6 << 4) /* 0110: 6 line periods */
+#define PIXPAPER_PWS_VCOM_W_7 (0x7 << 4) /* 0111: 7 line periods */
+#define PIXPAPER_PWS_VCOM_W_8 (0x8 << 4) /* 1000: 8 line periods */
+#define PIXPAPER_PWS_VCOM_W_9 (0x9 << 4) /* 1001: 9 line periods */
+#define PIXPAPER_PWS_VCOM_W_10 (0xA << 4) /* 1010: 10 line periods */
+#define PIXPAPER_PWS_VCOM_W_11 (0xB << 4) /* 1011: 11 line periods */
+#define PIXPAPER_PWS_VCOM_W_12 (0xC << 4) /* 1100: 12 line periods */
+#define PIXPAPER_PWS_VCOM_W_13 (0xD << 4) /* 1101: 13 line periods */
+#define PIXPAPER_PWS_VCOM_W_14 (0xE << 4) /* 1110: 14 line periods */
+#define PIXPAPER_PWS_VCOM_W_15 (0xF << 4) /* 1111: 15 line periods */
+#define PIXPAPER_PWS_SD_W_MASK \
+	(0xF << 0) /* Bits 3-0: SD_W[3:0], source power-saving width (660 ns units) */
+#define PIXPAPER_PWS_SD_W_0 (0x0 << 0) /* 0000: 0 ns */
+#define PIXPAPER_PWS_SD_W_1 (0x1 << 0) /* 0001: 660 ns */
+#define PIXPAPER_PWS_SD_W_2 (0x2 << 0) /* 0010: 1320 ns */
+#define PIXPAPER_PWS_SD_W_3 (0x3 << 0) /* 0011: 1980 ns */
+#define PIXPAPER_PWS_SD_W_4 (0x4 << 0) /* 0100: 2640 ns */
+#define PIXPAPER_PWS_SD_W_5 (0x5 << 0) /* 0101: 3300 ns */
+#define PIXPAPER_PWS_SD_W_6 (0x6 << 0) /* 0110: 3960 ns */
+#define PIXPAPER_PWS_SD_W_7 (0x7 << 0) /* 0111: 4620 ns */
+#define PIXPAPER_PWS_SD_W_8 (0x8 << 0) /* 1000: 5280 ns */
+#define PIXPAPER_PWS_SD_W_9 (0x9 << 0) /* 1001: 5940 ns */
+#define PIXPAPER_PWS_SD_W_10 (0xA << 0) /* 1010: 6600 ns */
+#define PIXPAPER_PWS_SD_W_11 (0xB << 0) /* 1011: 7260 ns */
+#define PIXPAPER_PWS_SD_W_12 (0xC << 0) /* 1100: 7920 ns */
+#define PIXPAPER_PWS_SD_W_13 (0xD << 0) /* 1101: 8580 ns */
+#define PIXPAPER_PWS_SD_W_14 (0xE << 0) /* 1110: 9240 ns */
+#define PIXPAPER_PWS_SD_W_15 (0xF << 0) /* 1111: 9900 ns */
+#define PIXPAPER_PWS_CONFIG      \
+	(PIXPAPER_PWS_VCOM_W_2 | \
+	 PIXPAPER_PWS_SD_W_2) /* 0x22: VCOM 2 line periods (160 µs), source 1320 ns */
+
+/* RE7H */
+#define PIXPAPER_UNKNOWN_E7_CONFIG \
+	0x1C /* This value is essential for initialization, derived from userspace examples. */
+
+/* RE9H */
+#define PIXPAPER_UNKNOWN_E9_CONFIG \
+	0x01 /* This value is essential for initialization, derived from userspace examples. */
+
+MODULE_IMPORT_NS("DMA_BUF");
+
+/*
+ * The panel has a visible resolution of 122x250.
+ * However, the controller requires the horizontal resolution to be aligned to 128 pixels.
+ * No porch or sync timing values are provided in the datasheet, so we define minimal
+ * placeholder values to satisfy the DRM framework.
+ */
+
+/* Panel visible resolution */
+#define PIXPAPER_WIDTH           122
+#define PIXPAPER_HEIGHT          250
+
+/* Controller requires 128 horizontal pixels total (for memory alignment) */
+#define PIXPAPER_HTOTAL          128
+#define PIXPAPER_HFP             2
+#define PIXPAPER_HSYNC           2
+#define PIXPAPER_HBP             (PIXPAPER_HTOTAL - PIXPAPER_WIDTH - PIXPAPER_HFP - PIXPAPER_HSYNC)
+
+/*
+ * According to the datasheet, the total vertical blanking must be 55 lines,
+ * regardless of how the vertical back porch is set.
+ * Here we allocate VFP=2, VSYNC=2, and VBP=51 to sum up to 55 lines.
+ * Total vertical lines = 250 (visible) + 55 (blanking) = 305.
+ */
+#define PIXPAPER_VTOTAL  (250 + 55)
+#define PIXPAPER_VFP     2
+#define PIXPAPER_VSYNC   2
+#define PIXPAPER_VBP     (55 - PIXPAPER_VFP - PIXPAPER_VSYNC)
+
+/*
+ * Pixel clock calculation:
+ * pixel_clock = htotal * vtotal * refresh_rate
+ *             = 128 * 305 * 50
+ *             = 1,952,000 Hz = 1952 kHz
+ */
+#define PIXPAPER_PIXEL_CLOCK     1952
+
+#define PIXPAPER_WIDTH_MM        24    /* approximate from 23.7046mm */
+#define PIXPAPER_HEIGHT_MM       49    /* approximate from 48.55mm */
+
+#define PIXPAPER_SPI_BITS_PER_WORD	8
+#define PIXPAPER_SPI_SPEED_DEFAULT      1000000
+
+#define PIXPAPER_PANEL_BUFFER_WIDTH	128
+#define PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW (PIXPAPER_PANEL_BUFFER_WIDTH / 4)
+
+#define PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL		60
+#define PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL		200
+#define PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN	180
+
+struct pixpaper_error_ctx {
+	int errno_code;
+};
+
+struct pixpaper_panel {
+	struct drm_device drm;
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+
+	struct spi_device *spi;
+	struct gpio_desc *reset;
+	struct gpio_desc *busy;
+	struct gpio_desc *dc;
+};
+
+static inline struct pixpaper_panel *to_pixpaper_panel(struct drm_device *drm)
+{
+	return container_of(drm, struct pixpaper_panel, drm);
+}
+
+static void pixpaper_wait_for_panel(struct pixpaper_panel *panel)
+{
+	unsigned int timeout_ms = 10000;
+	unsigned long timeout_jiffies = jiffies + msecs_to_jiffies(timeout_ms);
+
+	usleep_range(1000, 1500);
+	while (gpiod_get_value_cansleep(panel->busy) != 1) {
+		if (time_after(jiffies, timeout_jiffies)) {
+			drm_warn(&panel->drm, "Busy wait timed out\n");
+			return;
+		}
+		usleep_range(100, 200);
+	}
+}
+
+static void pixpaper_spi_sync(struct spi_device *spi, struct spi_message *msg,
+			      struct pixpaper_error_ctx *err)
+{
+	if (err->errno_code)
+		return;
+
+	int ret = spi_sync(spi, msg);
+
+	if (ret < 0)
+		err->errno_code = ret;
+}
+
+static void pixpaper_send_cmd(struct pixpaper_panel *panel, u8 cmd,
+			      struct pixpaper_error_ctx *err)
+{
+	if (err->errno_code)
+		return;
+
+	struct spi_transfer xfer = {
+		.tx_buf = &cmd,
+		.len = 1,
+	};
+	struct spi_message msg;
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+
+	gpiod_set_value_cansleep(panel->dc, 0);
+	usleep_range(1, 5);
+	pixpaper_spi_sync(panel->spi, &msg, err);
+}
+
+static void pixpaper_send_data(struct pixpaper_panel *panel, u8 data,
+			       struct pixpaper_error_ctx *err)
+{
+	if (err->errno_code)
+		return;
+
+	struct spi_transfer xfer = {
+		.tx_buf = &data,
+		.len = 1,
+	};
+	struct spi_message msg;
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+
+	gpiod_set_value_cansleep(panel->dc, 1);
+	usleep_range(1, 5);
+	pixpaper_spi_sync(panel->spi, &msg, err);
+}
+
+static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)
+{
+	struct pixpaper_error_ctx err = { .errno_code = 0 };
+
+	gpiod_set_value_cansleep(panel->reset, 0);
+	msleep(50);
+	gpiod_set_value_cansleep(panel->reset, 1);
+	msleep(50);
+
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_4D_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_PANEL_SETTING, &err);
+	pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG, &err);
+	pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG2, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SETTING, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG1, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG2, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWR_VSPL_15V, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWR_VSN_4V, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF_SEQUENCE, &err);
+	pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG1, &err);
+	pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG2, &err);
+	pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG3, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_BOOSTER_SOFT_START, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG1, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG2, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG3, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG4, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG5, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG6, &err);
+	pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG7, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_PLL_CONTROL, &err);
+	pixpaper_send_data(panel, PIXPAPER_PLL_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_TEMP_SENSOR_CALIB, &err);
+	pixpaper_send_data(panel, PIXPAPER_TSE_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_VCOM_INTERVAL, &err);
+	pixpaper_send_data(panel, PIXPAPER_CDI_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_60, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG1, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG2, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_RESOLUTION_SETTING, &err);
+	pixpaper_send_data(panel, PIXPAPER_TRES_HRES_H, &err);
+	pixpaper_send_data(panel, PIXPAPER_TRES_HRES_L, &err);
+	pixpaper_send_data(panel, PIXPAPER_TRES_VRES_H, &err);
+	pixpaper_send_data(panel, PIXPAPER_TRES_VRES_L, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_GATE_SOURCE_START, &err);
+	pixpaper_send_data(panel, PIXPAPER_GSST_S_START, &err);
+	pixpaper_send_data(panel, PIXPAPER_GSST_RESERVED, &err);
+	pixpaper_send_data(panel, PIXPAPER_GSST_G_START_H, &err);
+	pixpaper_send_data(panel, PIXPAPER_GSST_G_START_L, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E7, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E7_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SAVING, &err);
+	pixpaper_send_data(panel, PIXPAPER_PWS_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E0, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E0_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B4, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B4_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B5, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B5_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E9, &err);
+	pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E9_CONFIG, &err);
+	if (err.errno_code)
+		goto init_fail;
+	pixpaper_wait_for_panel(panel);
+
+	return 0;
+
+init_fail:
+	drm_err(&panel->drm, "Hardware initialization failed (err=%d)\n",
+		err.errno_code);
+	return err.errno_code;
+}
+
+/*
+ * Convert framebuffer pixels to 2-bit e-paper format:
+ *   00 - White
+ *   01 - Black
+ *   10 - Yellow
+ *   11 - Red
+ */
+static u8 pack_pixels_to_byte(__le32 *src_pixels, int i, int j,
+			      struct drm_framebuffer *fb)
+{
+	u8 packed_byte = 0;
+	int k;
+
+	for (k = 0; k < 4; k++) {
+		int current_pixel_x = j * 4 + k;
+		u8 two_bit_val;
+
+		if (current_pixel_x < PIXPAPER_WIDTH) {
+			u32 pixel_offset =
+				(i * (fb->pitches[0] / 4)) + current_pixel_x;
+			u32 pixel = le32_to_cpu(src_pixels[pixel_offset]);
+			u32 r = (pixel >> 16) & 0xFF;
+			u32 g = (pixel >> 8) & 0xFF;
+			u32 b = pixel & 0xFF;
+
+			if (r < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
+			    g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
+			    b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
+				two_bit_val = 0b00;
+			} else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+				   g > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+				   b > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL) {
+				two_bit_val = 0b01;
+			} else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+				   g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
+				   b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
+				two_bit_val = 0b11;
+			} else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
+				   g > PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN &&
+				   b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
+				two_bit_val = 0b10;
+			} else {
+				two_bit_val = 0b01;
+			}
+		} else {
+			two_bit_val = 0b01;
+		}
+
+		packed_byte |= two_bit_val << ((3 - k) * 2);
+	}
+
+	return packed_byte;
+}
+
+static int pixpaper_plane_helper_atomic_check(struct drm_plane *plane,
+					      struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *new_plane_state =
+		drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+	int ret;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state,
+						  new_crtc_state, DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING, false, false);
+	if (ret)
+		return ret;
+	else if (!new_plane_state->visible)
+		return 0;
+
+	return 0;
+}
+
+static int pixpaper_crtc_helper_atomic_check(struct drm_crtc *crtc,
+					     struct drm_atomic_commit *state)
+{
+	struct drm_crtc_state *crtc_state =
+		drm_atomic_get_new_crtc_state(state, crtc);
+
+	if (!crtc_state->enable)
+		return 0;
+
+	return drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+}
+
+static void pixpaper_crtc_atomic_enable(struct drm_crtc *crtc,
+					struct drm_atomic_commit *state)
+{
+	struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
+	struct drm_device *drm = &panel->drm;
+	int idx;
+	struct pixpaper_error_ctx err = { .errno_code = 0 };
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err);
+	if (err.errno_code) {
+		drm_err_once(drm, "Failed to send PON command: %d\n", err.errno_code);
+		goto exit_drm_dev;
+	}
+
+	pixpaper_wait_for_panel(panel);
+
+	drm_dbg(drm, "Panel enabled and powered on\n");
+
+exit_drm_dev:
+	drm_dev_exit(idx);
+}
+
+static void pixpaper_crtc_atomic_disable(struct drm_crtc *crtc,
+					 struct drm_atomic_commit *state)
+{
+	struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
+	struct drm_device *drm = &panel->drm;
+	struct pixpaper_error_ctx err = { .errno_code = 0 };
+	int idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF, &err);
+	if (err.errno_code) {
+		drm_err_once(drm, "Failed to send POF command: %d\n", err.errno_code);
+		goto exit_drm_dev;
+	}
+	pixpaper_wait_for_panel(panel);
+
+	drm_dbg(drm, "Panel disabled\n");
+
+exit_drm_dev:
+	drm_dev_exit(idx);
+}
+
+static void pixpaper_plane_atomic_update(struct drm_plane *plane,
+					 struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *plane_state =
+		drm_atomic_get_new_plane_state(state, plane);
+	struct drm_shadow_plane_state *shadow_plane_state =
+		to_drm_shadow_plane_state(plane_state);
+	struct drm_crtc *crtc = plane_state->crtc;
+	struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
+
+	struct drm_device *drm = &panel->drm;
+	struct drm_framebuffer *fb = plane_state->fb;
+	struct iosys_map map = shadow_plane_state->data[0];
+	void *vaddr = map.vaddr;
+	int i, j, idx;
+	__le32 *src_pixels = NULL;
+	struct pixpaper_error_ctx err = { .errno_code = 0 };
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	drm_dbg(drm, "Starting frame update (phys=%dx%d, buf_w=%d)\n",
+		PIXPAPER_WIDTH, PIXPAPER_HEIGHT, PIXPAPER_PANEL_BUFFER_WIDTH);
+
+	if (!fb || !plane_state->visible) {
+		drm_err_once(drm, "No framebuffer or plane not visible, skipping update\n");
+		goto update_cleanup;
+	}
+
+	src_pixels = (__le32 *)vaddr;
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_DATA_START_TRANSMISSION, &err);
+	if (err.errno_code)
+		goto update_cleanup;
+
+	pixpaper_wait_for_panel(panel);
+
+	for (i = 0; i < PIXPAPER_HEIGHT; i++) {
+		for (j = 0; j < PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW; j++) {
+			u8 packed_byte =
+				pack_pixels_to_byte(src_pixels, i, j, fb);
+
+			pixpaper_wait_for_panel(panel);
+			pixpaper_send_data(panel, packed_byte, &err);
+		}
+	}
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err);
+	if (err.errno_code) {
+		drm_err_once(drm, "Failed to send PON command: %d\n", err.errno_code);
+		goto update_cleanup;
+	}
+	pixpaper_wait_for_panel(panel);
+
+	pixpaper_send_cmd(panel, PIXPAPER_CMD_DISPLAY_REFRESH, &err);
+	pixpaper_send_data(panel, PIXPAPER_DRF_VCOM_AC, &err);
+	if (err.errno_code) {
+		drm_err_once(drm, "Failed sending data after DRF: %d\n", err.errno_code);
+		goto update_cleanup;
+	}
+	pixpaper_wait_for_panel(panel);
+
+update_cleanup:
+	if (err.errno_code && err.errno_code != -ETIMEDOUT)
+		drm_err_once(drm, "Frame update function failed with error %d\n", err.errno_code);
+
+	drm_dev_exit(idx);
+}
+
+static const struct drm_display_mode pixpaper_mode = {
+	.clock = PIXPAPER_PIXEL_CLOCK,
+	.hdisplay = PIXPAPER_WIDTH,
+	.hsync_start = PIXPAPER_WIDTH + PIXPAPER_HFP,
+	.hsync_end = PIXPAPER_WIDTH + PIXPAPER_HFP + PIXPAPER_HSYNC,
+	.htotal = PIXPAPER_HTOTAL,
+	.vdisplay = PIXPAPER_HEIGHT,
+	.vsync_start = PIXPAPER_HEIGHT + PIXPAPER_VFP,
+	.vsync_end = PIXPAPER_HEIGHT + PIXPAPER_VFP + PIXPAPER_VSYNC,
+	.vtotal = PIXPAPER_VTOTAL,
+	.width_mm = PIXPAPER_WIDTH_MM,
+	.height_mm = PIXPAPER_HEIGHT_MM,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static int pixpaper_connector_get_modes(struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &pixpaper_mode);
+}
+
+static const struct drm_plane_funcs pixpaper_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	DRM_GEM_SHADOW_PLANE_FUNCS,
+};
+
+static const struct drm_plane_helper_funcs pixpaper_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = pixpaper_plane_helper_atomic_check,
+	.atomic_update = pixpaper_plane_atomic_update,
+};
+
+static const struct drm_crtc_funcs pixpaper_crtc_funcs = {
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static enum drm_mode_status
+pixpaper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
+{
+	if (mode->hdisplay == PIXPAPER_WIDTH &&
+	    mode->vdisplay == PIXPAPER_HEIGHT) {
+		return MODE_OK;
+	}
+	return MODE_BAD;
+}
+
+static const struct drm_crtc_helper_funcs pixpaper_crtc_helper_funcs = {
+	.mode_valid = pixpaper_mode_valid,
+	.atomic_check = pixpaper_crtc_helper_atomic_check,
+	.atomic_enable = pixpaper_crtc_atomic_enable,
+	.atomic_disable = pixpaper_crtc_atomic_disable,
+};
+
+static const struct drm_encoder_funcs pixpaper_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_connector_funcs pixpaper_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_connector_helper_funcs pixpaper_connector_helper_funcs = {
+	.get_modes = pixpaper_connector_get_modes,
+};
+
+DEFINE_DRM_GEM_FOPS(pixpaper_fops);
+
+static struct drm_driver pixpaper_drm_driver = {
+	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops = &pixpaper_fops,
+	.name = "pixpaper",
+	.desc = "DRM driver for PIXPAPER e-ink",
+	.major = 1,
+	.minor = 0,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	DRM_FBDEV_SHMEM_DRIVER_OPS,
+};
+
+static const struct drm_mode_config_funcs pixpaper_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int pixpaper_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct pixpaper_panel *panel;
+	struct drm_device *drm;
+	int ret;
+
+	panel = devm_drm_dev_alloc(dev, &pixpaper_drm_driver,
+				   struct pixpaper_panel, drm);
+	if (IS_ERR(panel))
+		return PTR_ERR(panel);
+
+	drm = &panel->drm;
+	panel->spi = spi;
+	spi_set_drvdata(spi, panel);
+
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = PIXPAPER_SPI_BITS_PER_WORD;
+
+	if (!spi->max_speed_hz) {
+		drm_warn(drm,
+			 "spi-max-frequency not specified in DT, using default %u Hz\n",
+			 PIXPAPER_SPI_SPEED_DEFAULT);
+		spi->max_speed_hz = PIXPAPER_SPI_SPEED_DEFAULT;
+	}
+
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		drm_err(drm, "SPI setup failed: %d\n", ret);
+		return ret;
+	}
+
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (ret) {
+		drm_err(drm, "Failed to set DMA mask: %d\n", ret);
+		return ret;
+	}
+
+	panel->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(panel->reset))
+		return PTR_ERR(panel->reset);
+
+	panel->busy = devm_gpiod_get(dev, "busy", GPIOD_IN);
+	if (IS_ERR(panel->busy))
+		return PTR_ERR(panel->busy);
+
+	panel->dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_HIGH);
+	if (IS_ERR(panel->dc))
+		return PTR_ERR(panel->dc);
+
+	ret = pixpaper_panel_hw_init(panel);
+	if (ret) {
+		drm_err(drm, "Panel hardware initialization failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+	drm->mode_config.funcs = &pixpaper_mode_config_funcs;
+	drm->mode_config.min_width = PIXPAPER_WIDTH;
+	drm->mode_config.max_width = PIXPAPER_WIDTH;
+	drm->mode_config.min_height = PIXPAPER_HEIGHT;
+	drm->mode_config.max_height = PIXPAPER_HEIGHT;
+
+	ret = drm_universal_plane_init(drm, &panel->plane, 1,
+				       &pixpaper_plane_funcs,
+				       (const uint32_t[]){ DRM_FORMAT_XRGB8888 },
+				       1, NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(&panel->plane, &pixpaper_plane_helper_funcs);
+
+	ret = drm_crtc_init_with_planes(drm, &panel->crtc, &panel->plane, NULL,
+					&pixpaper_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(&panel->crtc, &pixpaper_crtc_helper_funcs);
+
+	ret = drm_encoder_init(drm, &panel->encoder, &pixpaper_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+	panel->encoder.possible_crtcs = drm_crtc_mask(&panel->crtc);
+
+	ret = drm_connector_init(drm, &panel->connector,
+				 &pixpaper_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+
+	drm_connector_helper_add(&panel->connector,
+				 &pixpaper_connector_helper_funcs);
+	drm_connector_attach_encoder(&panel->connector, &panel->encoder);
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void pixpaper_remove(struct spi_device *spi)
+{
+	struct pixpaper_panel *panel = spi_get_drvdata(spi);
+
+	if (!panel)
+		return;
+
+	drm_dev_unplug(&panel->drm);
+	drm_atomic_helper_shutdown(&panel->drm);
+}
+
+static const struct spi_device_id pixpaper_ids[] = { { "pixpaper", 0 }, {} };
+MODULE_DEVICE_TABLE(spi, pixpaper_ids);
+
+static const struct of_device_id pixpaper_dt_ids[] = {
+	{ .compatible = "mayqueen,pixpaper" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, pixpaper_dt_ids);
+
+static struct spi_driver pixpaper_spi_driver = {
+	.driver = {
+		.name = "pixpaper",
+		.of_match_table = pixpaper_dt_ids,
+	},
+	.id_table = pixpaper_ids,
+	.probe = pixpaper_probe,
+	.remove = pixpaper_remove,
+};
+
+module_spi_driver(pixpaper_spi_driver);
+
+MODULE_AUTHOR("LiangCheng Wang");
+MODULE_DESCRIPTION("DRM SPI driver for PIXPAPER e-ink panel");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c
new file mode 100644
index 000000000..c8270591a
--- /dev/null
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -0,0 +1,1153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DRM driver for Pervasive Displays RePaper branded e-ink panels
+ *
+ * Copyright 2013-2017 Pervasive Displays, Inc.
+ * Copyright 2017 Noralf Trønnes
+ *
+ * The driver supports:
+ * Material Film: Aurora Mb (V231)
+ * Driver IC: G2 (eTC)
+ *
+ * The controller code was taken from the userspace driver:
+ * https://github.com/repaper/gratis
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/sched/clock.h>
+#include <linux/spi/spi.h>
+#include <linux/thermal.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_rect.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#define REPAPER_RID_G2_COG_ID	0x12
+
+enum repaper_model {
+	/* 0 is reserved to avoid clashing with NULL */
+	E1144CS021 = 1,
+	E1190CS021,
+	E2200CS021,
+	E2271CS021,
+};
+
+enum repaper_stage {         /* Image pixel -> Display pixel */
+	REPAPER_COMPENSATE,  /* B -> W, W -> B (Current Image) */
+	REPAPER_WHITE,       /* B -> N, W -> W (Current Image) */
+	REPAPER_INVERSE,     /* B -> N, W -> B (New Image) */
+	REPAPER_NORMAL       /* B -> B, W -> W (New Image) */
+};
+
+enum repaper_epd_border_byte {
+	REPAPER_BORDER_BYTE_NONE,
+	REPAPER_BORDER_BYTE_ZERO,
+	REPAPER_BORDER_BYTE_SET,
+};
+
+struct repaper_epd {
+	struct drm_device drm;
+	struct drm_simple_display_pipe pipe;
+	const struct drm_display_mode *mode;
+	struct drm_connector connector;
+	struct spi_device *spi;
+
+	struct gpio_desc *panel_on;
+	struct gpio_desc *border;
+	struct gpio_desc *discharge;
+	struct gpio_desc *reset;
+	struct gpio_desc *busy;
+
+	struct thermal_zone_device *thermal;
+
+	unsigned int height;
+	unsigned int width;
+	unsigned int bytes_per_scan;
+	const u8 *channel_select;
+	unsigned int stage_time;
+	unsigned int factored_stage_time;
+	bool middle_scan;
+	bool pre_border_byte;
+	enum repaper_epd_border_byte border_byte;
+
+	u8 *line_buffer;
+	void *current_frame;
+
+	bool cleared;
+	bool partial;
+};
+
+static inline struct repaper_epd *drm_to_epd(struct drm_device *drm)
+{
+	return container_of(drm, struct repaper_epd, drm);
+}
+
+static int repaper_spi_transfer(struct spi_device *spi, u8 header,
+				const void *tx, void *rx, size_t len)
+{
+	void *txbuf = NULL, *rxbuf = NULL;
+	struct spi_transfer tr[2] = {};
+	u8 *headerbuf;
+	int ret;
+
+	headerbuf = kmalloc(1, GFP_KERNEL);
+	if (!headerbuf)
+		return -ENOMEM;
+
+	headerbuf[0] = header;
+	tr[0].tx_buf = headerbuf;
+	tr[0].len = 1;
+
+	/* Stack allocated tx? */
+	if (tx && len <= 32) {
+		txbuf = kmemdup(tx, len, GFP_KERNEL);
+		if (!txbuf) {
+			ret = -ENOMEM;
+			goto out_free;
+		}
+	}
+
+	if (rx) {
+		rxbuf = kmalloc(len, GFP_KERNEL);
+		if (!rxbuf) {
+			ret = -ENOMEM;
+			goto out_free;
+		}
+	}
+
+	tr[1].tx_buf = txbuf ? txbuf : tx;
+	tr[1].rx_buf = rxbuf;
+	tr[1].len = len;
+
+	ndelay(80);
+	ret = spi_sync_transfer(spi, tr, 2);
+	if (rx && !ret)
+		memcpy(rx, rxbuf, len);
+
+out_free:
+	kfree(headerbuf);
+	kfree(txbuf);
+	kfree(rxbuf);
+
+	return ret;
+}
+
+static int repaper_write_buf(struct spi_device *spi, u8 reg,
+			     const u8 *buf, size_t len)
+{
+	int ret;
+
+	ret = repaper_spi_transfer(spi, 0x70, &reg, NULL, 1);
+	if (ret)
+		return ret;
+
+	return repaper_spi_transfer(spi, 0x72, buf, NULL, len);
+}
+
+static int repaper_write_val(struct spi_device *spi, u8 reg, u8 val)
+{
+	return repaper_write_buf(spi, reg, &val, 1);
+}
+
+static int repaper_read_val(struct spi_device *spi, u8 reg)
+{
+	int ret;
+	u8 val;
+
+	ret = repaper_spi_transfer(spi, 0x70, &reg, NULL, 1);
+	if (ret)
+		return ret;
+
+	ret = repaper_spi_transfer(spi, 0x73, NULL, &val, 1);
+
+	return ret ? ret : val;
+}
+
+static int repaper_read_id(struct spi_device *spi)
+{
+	int ret;
+	u8 id;
+
+	ret = repaper_spi_transfer(spi, 0x71, NULL, &id, 1);
+
+	return ret ? ret : id;
+}
+
+static void repaper_spi_mosi_low(struct spi_device *spi)
+{
+	const u8 buf[1] = { 0 };
+
+	spi_write(spi, buf, 1);
+}
+
+/* pixels on display are numbered from 1 so even is actually bits 1,3,5,... */
+static void repaper_even_pixels(struct repaper_epd *epd, u8 **pp,
+				const u8 *data, u8 fixed_value, const u8 *mask,
+				enum repaper_stage stage)
+{
+	unsigned int b;
+
+	for (b = 0; b < (epd->width / 8); b++) {
+		if (data) {
+			u8 pixels = data[b] & 0xaa;
+			u8 pixel_mask = 0xff;
+			u8 p1, p2, p3, p4;
+
+			if (mask) {
+				pixel_mask = (mask[b] ^ pixels) & 0xaa;
+				pixel_mask |= pixel_mask >> 1;
+			}
+
+			switch (stage) {
+			case REPAPER_COMPENSATE: /* B -> W, W -> B (Current) */
+				pixels = 0xaa | ((pixels ^ 0xaa) >> 1);
+				break;
+			case REPAPER_WHITE:      /* B -> N, W -> W (Current) */
+				pixels = 0x55 + ((pixels ^ 0xaa) >> 1);
+				break;
+			case REPAPER_INVERSE:    /* B -> N, W -> B (New) */
+				pixels = 0x55 | (pixels ^ 0xaa);
+				break;
+			case REPAPER_NORMAL:     /* B -> B, W -> W (New) */
+				pixels = 0xaa | (pixels >> 1);
+				break;
+			}
+
+			pixels = (pixels & pixel_mask) | (~pixel_mask & 0x55);
+			p1 = (pixels >> 6) & 0x03;
+			p2 = (pixels >> 4) & 0x03;
+			p3 = (pixels >> 2) & 0x03;
+			p4 = (pixels >> 0) & 0x03;
+			pixels = (p1 << 0) | (p2 << 2) | (p3 << 4) | (p4 << 6);
+			*(*pp)++ = pixels;
+		} else {
+			*(*pp)++ = fixed_value;
+		}
+	}
+}
+
+/* pixels on display are numbered from 1 so odd is actually bits 0,2,4,... */
+static void repaper_odd_pixels(struct repaper_epd *epd, u8 **pp,
+			       const u8 *data, u8 fixed_value, const u8 *mask,
+			       enum repaper_stage stage)
+{
+	unsigned int b;
+
+	for (b = epd->width / 8; b > 0; b--) {
+		if (data) {
+			u8 pixels = data[b - 1] & 0x55;
+			u8 pixel_mask = 0xff;
+
+			if (mask) {
+				pixel_mask = (mask[b - 1] ^ pixels) & 0x55;
+				pixel_mask |= pixel_mask << 1;
+			}
+
+			switch (stage) {
+			case REPAPER_COMPENSATE: /* B -> W, W -> B (Current) */
+				pixels = 0xaa | (pixels ^ 0x55);
+				break;
+			case REPAPER_WHITE:      /* B -> N, W -> W (Current) */
+				pixels = 0x55 + (pixels ^ 0x55);
+				break;
+			case REPAPER_INVERSE:    /* B -> N, W -> B (New) */
+				pixels = 0x55 | ((pixels ^ 0x55) << 1);
+				break;
+			case REPAPER_NORMAL:     /* B -> B, W -> W (New) */
+				pixels = 0xaa | pixels;
+				break;
+			}
+
+			pixels = (pixels & pixel_mask) | (~pixel_mask & 0x55);
+			*(*pp)++ = pixels;
+		} else {
+			*(*pp)++ = fixed_value;
+		}
+	}
+}
+
+/* interleave bits: (byte)76543210 -> (16 bit).7.6.5.4.3.2.1 */
+static inline u16 repaper_interleave_bits(u16 value)
+{
+	value = (value | (value << 4)) & 0x0f0f;
+	value = (value | (value << 2)) & 0x3333;
+	value = (value | (value << 1)) & 0x5555;
+
+	return value;
+}
+
+/* pixels on display are numbered from 1 */
+static void repaper_all_pixels(struct repaper_epd *epd, u8 **pp,
+			       const u8 *data, u8 fixed_value, const u8 *mask,
+			       enum repaper_stage stage)
+{
+	unsigned int b;
+
+	for (b = epd->width / 8; b > 0; b--) {
+		if (data) {
+			u16 pixels = repaper_interleave_bits(data[b - 1]);
+			u16 pixel_mask = 0xffff;
+
+			if (mask) {
+				pixel_mask = repaper_interleave_bits(mask[b - 1]);
+
+				pixel_mask = (pixel_mask ^ pixels) & 0x5555;
+				pixel_mask |= pixel_mask << 1;
+			}
+
+			switch (stage) {
+			case REPAPER_COMPENSATE: /* B -> W, W -> B (Current) */
+				pixels = 0xaaaa | (pixels ^ 0x5555);
+				break;
+			case REPAPER_WHITE:      /* B -> N, W -> W (Current) */
+				pixels = 0x5555 + (pixels ^ 0x5555);
+				break;
+			case REPAPER_INVERSE:    /* B -> N, W -> B (New) */
+				pixels = 0x5555 | ((pixels ^ 0x5555) << 1);
+				break;
+			case REPAPER_NORMAL:     /* B -> B, W -> W (New) */
+				pixels = 0xaaaa | pixels;
+				break;
+			}
+
+			pixels = (pixels & pixel_mask) | (~pixel_mask & 0x5555);
+			*(*pp)++ = pixels >> 8;
+			*(*pp)++ = pixels;
+		} else {
+			*(*pp)++ = fixed_value;
+			*(*pp)++ = fixed_value;
+		}
+	}
+}
+
+/* output one line of scan and data bytes to the display */
+static void repaper_one_line(struct repaper_epd *epd, unsigned int line,
+			     const u8 *data, u8 fixed_value, const u8 *mask,
+			     enum repaper_stage stage)
+{
+	u8 *p = epd->line_buffer;
+	unsigned int b;
+
+	repaper_spi_mosi_low(epd->spi);
+
+	if (epd->pre_border_byte)
+		*p++ = 0x00;
+
+	if (epd->middle_scan) {
+		/* data bytes */
+		repaper_odd_pixels(epd, &p, data, fixed_value, mask, stage);
+
+		/* scan line */
+		for (b = epd->bytes_per_scan; b > 0; b--) {
+			if (line / 4 == b - 1)
+				*p++ = 0x03 << (2 * (line & 0x03));
+			else
+				*p++ = 0x00;
+		}
+
+		/* data bytes */
+		repaper_even_pixels(epd, &p, data, fixed_value, mask, stage);
+	} else {
+		/*
+		 * even scan line, but as lines on display are numbered from 1,
+		 * line: 1,3,5,...
+		 */
+		for (b = 0; b < epd->bytes_per_scan; b++) {
+			if (0 != (line & 0x01) && line / 8 == b)
+				*p++ = 0xc0 >> (line & 0x06);
+			else
+				*p++ = 0x00;
+		}
+
+		/* data bytes */
+		repaper_all_pixels(epd, &p, data, fixed_value, mask, stage);
+
+		/*
+		 * odd scan line, but as lines on display are numbered from 1,
+		 * line: 0,2,4,6,...
+		 */
+		for (b = epd->bytes_per_scan; b > 0; b--) {
+			if (0 == (line & 0x01) && line / 8 == b - 1)
+				*p++ = 0x03 << (line & 0x06);
+			else
+				*p++ = 0x00;
+		}
+	}
+
+	switch (epd->border_byte) {
+	case REPAPER_BORDER_BYTE_NONE:
+		break;
+
+	case REPAPER_BORDER_BYTE_ZERO:
+		*p++ = 0x00;
+		break;
+
+	case REPAPER_BORDER_BYTE_SET:
+		switch (stage) {
+		case REPAPER_COMPENSATE:
+		case REPAPER_WHITE:
+		case REPAPER_INVERSE:
+			*p++ = 0x00;
+			break;
+		case REPAPER_NORMAL:
+			*p++ = 0xaa;
+			break;
+		}
+		break;
+	}
+
+	repaper_write_buf(epd->spi, 0x0a, epd->line_buffer,
+			  p - epd->line_buffer);
+
+	/* Output data to panel */
+	repaper_write_val(epd->spi, 0x02, 0x07);
+
+	repaper_spi_mosi_low(epd->spi);
+}
+
+static void repaper_frame_fixed(struct repaper_epd *epd, u8 fixed_value,
+				enum repaper_stage stage)
+{
+	unsigned int line;
+
+	for (line = 0; line < epd->height; line++)
+		repaper_one_line(epd, line, NULL, fixed_value, NULL, stage);
+}
+
+static void repaper_frame_data(struct repaper_epd *epd, const u8 *image,
+			       const u8 *mask, enum repaper_stage stage)
+{
+	unsigned int line;
+
+	if (!mask) {
+		for (line = 0; line < epd->height; line++) {
+			repaper_one_line(epd, line,
+					 &image[line * (epd->width / 8)],
+					 0, NULL, stage);
+		}
+	} else {
+		for (line = 0; line < epd->height; line++) {
+			size_t n = line * epd->width / 8;
+
+			repaper_one_line(epd, line, &image[n], 0, &mask[n],
+					 stage);
+		}
+	}
+}
+
+static void repaper_frame_fixed_repeat(struct repaper_epd *epd, u8 fixed_value,
+				       enum repaper_stage stage)
+{
+	u64 start = local_clock();
+	u64 end = start + ((u64)epd->factored_stage_time * 1000 * 1000);
+
+	do {
+		repaper_frame_fixed(epd, fixed_value, stage);
+	} while (local_clock() < end);
+}
+
+static void repaper_frame_data_repeat(struct repaper_epd *epd, const u8 *image,
+				      const u8 *mask, enum repaper_stage stage)
+{
+	u64 start = local_clock();
+	u64 end = start + ((u64)epd->factored_stage_time * 1000 * 1000);
+
+	do {
+		repaper_frame_data(epd, image, mask, stage);
+	} while (local_clock() < end);
+}
+
+static void repaper_get_temperature(struct repaper_epd *epd)
+{
+	int ret, temperature = 0;
+	unsigned int factor10x;
+
+	if (!epd->thermal)
+		return;
+
+	ret = thermal_zone_get_temp(epd->thermal, &temperature);
+	if (ret) {
+		DRM_DEV_ERROR(&epd->spi->dev, "Failed to get temperature (%d)\n", ret);
+		return;
+	}
+
+	temperature /= 1000;
+
+	if (temperature <= -10)
+		factor10x = 170;
+	else if (temperature <= -5)
+		factor10x = 120;
+	else if (temperature <= 5)
+		factor10x = 80;
+	else if (temperature <= 10)
+		factor10x = 40;
+	else if (temperature <= 15)
+		factor10x = 30;
+	else if (temperature <= 20)
+		factor10x = 20;
+	else if (temperature <= 40)
+		factor10x = 10;
+	else
+		factor10x = 7;
+
+	epd->factored_stage_time = epd->stage_time * factor10x / 10;
+}
+
+static int repaper_fb_dirty(struct drm_framebuffer *fb, const struct iosys_map *vmap,
+			    struct drm_format_conv_state *fmtcnv_state)
+{
+	struct repaper_epd *epd = drm_to_epd(fb->dev);
+	unsigned int dst_pitch = 0;
+	struct iosys_map dst;
+	struct drm_rect clip;
+	int idx, ret = 0;
+	u8 *buf = NULL;
+
+	if (!drm_dev_enter(fb->dev, &idx))
+		return -ENODEV;
+
+	/* repaper can't do partial updates */
+	clip.x1 = 0;
+	clip.x2 = fb->width;
+	clip.y1 = 0;
+	clip.y2 = fb->height;
+
+	repaper_get_temperature(epd);
+
+	DRM_DEBUG("Flushing [FB:%d] st=%ums\n", fb->base.id,
+		  epd->factored_stage_time);
+
+	buf = kmalloc(fb->width * fb->height / 8, GFP_KERNEL);
+	if (!buf) {
+		ret = -ENOMEM;
+		goto out_exit;
+	}
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret)
+		goto out_free;
+
+	iosys_map_set_vaddr(&dst, buf);
+	drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, &clip, fmtcnv_state);
+
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+
+	if (epd->partial) {
+		repaper_frame_data_repeat(epd, buf, epd->current_frame,
+					  REPAPER_NORMAL);
+	} else if (epd->cleared) {
+		repaper_frame_data_repeat(epd, epd->current_frame, NULL,
+					  REPAPER_COMPENSATE);
+		repaper_frame_data_repeat(epd, epd->current_frame, NULL,
+					  REPAPER_WHITE);
+		repaper_frame_data_repeat(epd, buf, NULL, REPAPER_INVERSE);
+		repaper_frame_data_repeat(epd, buf, NULL, REPAPER_NORMAL);
+
+		epd->partial = true;
+	} else {
+		/* Clear display (anything -> white) */
+		repaper_frame_fixed_repeat(epd, 0xff, REPAPER_COMPENSATE);
+		repaper_frame_fixed_repeat(epd, 0xff, REPAPER_WHITE);
+		repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_INVERSE);
+		repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_NORMAL);
+
+		/* Assuming a clear (white) screen output an image */
+		repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_COMPENSATE);
+		repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_WHITE);
+		repaper_frame_data_repeat(epd, buf, NULL, REPAPER_INVERSE);
+		repaper_frame_data_repeat(epd, buf, NULL, REPAPER_NORMAL);
+
+		epd->cleared = true;
+		epd->partial = true;
+	}
+
+	memcpy(epd->current_frame, buf, fb->width * fb->height / 8);
+
+	/*
+	 * An extra frame write is needed if pixels are set in the bottom line,
+	 * or else grey lines rises up from the pixels
+	 */
+	if (epd->pre_border_byte) {
+		unsigned int x;
+
+		for (x = 0; x < (fb->width / 8); x++)
+			if (buf[x + (fb->width * (fb->height - 1) / 8)]) {
+				repaper_frame_data_repeat(epd, buf,
+							  epd->current_frame,
+							  REPAPER_NORMAL);
+				break;
+			}
+	}
+
+out_free:
+	kfree(buf);
+out_exit:
+	drm_dev_exit(idx);
+
+	return ret;
+}
+
+static void power_off(struct repaper_epd *epd)
+{
+	/* Turn off power and all signals */
+	gpiod_set_value_cansleep(epd->reset, 0);
+	gpiod_set_value_cansleep(epd->panel_on, 0);
+	if (epd->border)
+		gpiod_set_value_cansleep(epd->border, 0);
+
+	/* Ensure SPI MOSI and CLOCK are Low before CS Low */
+	repaper_spi_mosi_low(epd->spi);
+
+	/* Discharge pulse */
+	gpiod_set_value_cansleep(epd->discharge, 1);
+	msleep(150);
+	gpiod_set_value_cansleep(epd->discharge, 0);
+}
+
+static enum drm_mode_status repaper_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
+						    const struct drm_display_mode *mode)
+{
+	struct drm_crtc *crtc = &pipe->crtc;
+	struct repaper_epd *epd = drm_to_epd(crtc->dev);
+
+	return drm_crtc_helper_mode_valid_fixed(crtc, mode, epd->mode);
+}
+
+static void repaper_pipe_enable(struct drm_simple_display_pipe *pipe,
+				struct drm_crtc_state *crtc_state,
+				struct drm_plane_state *plane_state)
+{
+	struct repaper_epd *epd = drm_to_epd(pipe->crtc.dev);
+	struct spi_device *spi = epd->spi;
+	struct device *dev = &spi->dev;
+	bool dc_ok = false;
+	int i, ret, idx;
+
+	if (!drm_dev_enter(pipe->crtc.dev, &idx))
+		return;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	/* Power up sequence */
+	gpiod_set_value_cansleep(epd->reset, 0);
+	gpiod_set_value_cansleep(epd->panel_on, 0);
+	gpiod_set_value_cansleep(epd->discharge, 0);
+	if (epd->border)
+		gpiod_set_value_cansleep(epd->border, 0);
+	repaper_spi_mosi_low(spi);
+	usleep_range(5000, 10000);
+
+	gpiod_set_value_cansleep(epd->panel_on, 1);
+	/*
+	 * This delay comes from the repaper.org userspace driver, it's not
+	 * mentioned in the datasheet.
+	 */
+	usleep_range(10000, 15000);
+	gpiod_set_value_cansleep(epd->reset, 1);
+	if (epd->border)
+		gpiod_set_value_cansleep(epd->border, 1);
+	usleep_range(5000, 10000);
+	gpiod_set_value_cansleep(epd->reset, 0);
+	usleep_range(5000, 10000);
+	gpiod_set_value_cansleep(epd->reset, 1);
+	usleep_range(5000, 10000);
+
+	/* Wait for COG to become ready */
+	for (i = 100; i > 0; i--) {
+		if (!gpiod_get_value_cansleep(epd->busy))
+			break;
+
+		usleep_range(10, 100);
+	}
+
+	if (!i) {
+		DRM_DEV_ERROR(dev, "timeout waiting for panel to become ready.\n");
+		power_off(epd);
+		goto out_exit;
+	}
+
+	repaper_read_id(spi);
+	ret = repaper_read_id(spi);
+	if (ret != REPAPER_RID_G2_COG_ID) {
+		if (ret < 0)
+			dev_err(dev, "failed to read chip (%d)\n", ret);
+		else
+			dev_err(dev, "wrong COG ID 0x%02x\n", ret);
+		power_off(epd);
+		goto out_exit;
+	}
+
+	/* Disable OE */
+	repaper_write_val(spi, 0x02, 0x40);
+
+	ret = repaper_read_val(spi, 0x0f);
+	if (ret < 0 || !(ret & 0x80)) {
+		if (ret < 0)
+			DRM_DEV_ERROR(dev, "failed to read chip (%d)\n", ret);
+		else
+			DRM_DEV_ERROR(dev, "panel is reported broken\n");
+		power_off(epd);
+		goto out_exit;
+	}
+
+	/* Power saving mode */
+	repaper_write_val(spi, 0x0b, 0x02);
+	/* Channel select */
+	repaper_write_buf(spi, 0x01, epd->channel_select, 8);
+	/* High power mode osc */
+	repaper_write_val(spi, 0x07, 0xd1);
+	/* Power setting */
+	repaper_write_val(spi, 0x08, 0x02);
+	/* Vcom level */
+	repaper_write_val(spi, 0x09, 0xc2);
+	/* Power setting */
+	repaper_write_val(spi, 0x04, 0x03);
+	/* Driver latch on */
+	repaper_write_val(spi, 0x03, 0x01);
+	/* Driver latch off */
+	repaper_write_val(spi, 0x03, 0x00);
+	usleep_range(5000, 10000);
+
+	/* Start chargepump */
+	for (i = 0; i < 4; ++i) {
+		/* Charge pump positive voltage on - VGH/VDL on */
+		repaper_write_val(spi, 0x05, 0x01);
+		msleep(240);
+
+		/* Charge pump negative voltage on - VGL/VDL on */
+		repaper_write_val(spi, 0x05, 0x03);
+		msleep(40);
+
+		/* Charge pump Vcom on - Vcom driver on */
+		repaper_write_val(spi, 0x05, 0x0f);
+		msleep(40);
+
+		/* check DC/DC */
+		ret = repaper_read_val(spi, 0x0f);
+		if (ret < 0) {
+			DRM_DEV_ERROR(dev, "failed to read chip (%d)\n", ret);
+			power_off(epd);
+			goto out_exit;
+		}
+
+		if (ret & 0x40) {
+			dc_ok = true;
+			break;
+		}
+	}
+
+	if (!dc_ok) {
+		DRM_DEV_ERROR(dev, "dc/dc failed\n");
+		power_off(epd);
+		goto out_exit;
+	}
+
+	/*
+	 * Output enable to disable
+	 * The userspace driver sets this to 0x04, but the datasheet says 0x06
+	 */
+	repaper_write_val(spi, 0x02, 0x04);
+
+	epd->partial = false;
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static void repaper_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+	struct repaper_epd *epd = drm_to_epd(pipe->crtc.dev);
+	struct spi_device *spi = epd->spi;
+	unsigned int line;
+
+	/*
+	 * This callback is not protected by drm_dev_enter/exit since we want to
+	 * turn off the display on regular driver unload. It's highly unlikely
+	 * that the underlying SPI controller is gone should this be called after
+	 * unplug.
+	 */
+
+	DRM_DEBUG_DRIVER("\n");
+
+	/* Nothing frame */
+	for (line = 0; line < epd->height; line++)
+		repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL,
+				 REPAPER_COMPENSATE);
+
+	/* 2.7" */
+	if (epd->border) {
+		/* Dummy line */
+		repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL,
+				 REPAPER_COMPENSATE);
+		msleep(25);
+		gpiod_set_value_cansleep(epd->border, 0);
+		msleep(200);
+		gpiod_set_value_cansleep(epd->border, 1);
+	} else {
+		/* Border dummy line */
+		repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL,
+				 REPAPER_NORMAL);
+		msleep(200);
+	}
+
+	/* not described in datasheet */
+	repaper_write_val(spi, 0x0b, 0x00);
+	/* Latch reset turn on */
+	repaper_write_val(spi, 0x03, 0x01);
+	/* Power off charge pump Vcom */
+	repaper_write_val(spi, 0x05, 0x03);
+	/* Power off charge pump neg voltage */
+	repaper_write_val(spi, 0x05, 0x01);
+	msleep(120);
+	/* Discharge internal */
+	repaper_write_val(spi, 0x04, 0x80);
+	/* turn off all charge pumps */
+	repaper_write_val(spi, 0x05, 0x00);
+	/* Turn off osc */
+	repaper_write_val(spi, 0x07, 0x01);
+	msleep(50);
+
+	power_off(epd);
+}
+
+static void repaper_pipe_update(struct drm_simple_display_pipe *pipe,
+				struct drm_plane_state *old_state)
+{
+	struct drm_plane_state *state = pipe->plane.state;
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
+	struct drm_rect rect;
+
+	if (!pipe->crtc.state->active)
+		return;
+
+	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
+		repaper_fb_dirty(state->fb, shadow_plane_state->data,
+				 &shadow_plane_state->fmtcnv_state);
+}
+
+static const struct drm_simple_display_pipe_funcs repaper_pipe_funcs = {
+	.mode_valid = repaper_pipe_mode_valid,
+	.enable = repaper_pipe_enable,
+	.disable = repaper_pipe_disable,
+	.update = repaper_pipe_update,
+	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
+};
+
+static int repaper_connector_get_modes(struct drm_connector *connector)
+{
+	struct repaper_epd *epd = drm_to_epd(connector->dev);
+
+	return drm_connector_helper_get_modes_fixed(connector, epd->mode);
+}
+
+static const struct drm_connector_helper_funcs repaper_connector_hfuncs = {
+	.get_modes = repaper_connector_get_modes,
+};
+
+static const struct drm_connector_funcs repaper_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_mode_config_funcs repaper_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static const uint32_t repaper_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+static const struct drm_display_mode repaper_e1144cs021_mode = {
+	DRM_SIMPLE_MODE(128, 96, 29, 22),
+};
+
+static const u8 repaper_e1144cs021_cs[] = { 0x00, 0x00, 0x00, 0x00,
+					    0x00, 0x0f, 0xff, 0x00 };
+
+static const struct drm_display_mode repaper_e1190cs021_mode = {
+	DRM_SIMPLE_MODE(144, 128, 36, 32),
+};
+
+static const u8 repaper_e1190cs021_cs[] = { 0x00, 0x00, 0x00, 0x03,
+					    0xfc, 0x00, 0x00, 0xff };
+
+static const struct drm_display_mode repaper_e2200cs021_mode = {
+	DRM_SIMPLE_MODE(200, 96, 46, 22),
+};
+
+static const u8 repaper_e2200cs021_cs[] = { 0x00, 0x00, 0x00, 0x00,
+					    0x01, 0xff, 0xe0, 0x00 };
+
+static const struct drm_display_mode repaper_e2271cs021_mode = {
+	DRM_SIMPLE_MODE(264, 176, 57, 38),
+};
+
+static const u8 repaper_e2271cs021_cs[] = { 0x00, 0x00, 0x00, 0x7f,
+					    0xff, 0xfe, 0x00, 0x00 };
+
+DEFINE_DRM_GEM_DMA_FOPS(repaper_fops);
+
+static const struct drm_driver repaper_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &repaper_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.name			= "repaper",
+	.desc			= "Pervasive Displays RePaper e-ink panels",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id repaper_of_match[] = {
+	{ .compatible = "pervasive,e1144cs021", .data = (void *)E1144CS021 },
+	{ .compatible = "pervasive,e1190cs021", .data = (void *)E1190CS021 },
+	{ .compatible = "pervasive,e2200cs021", .data = (void *)E2200CS021 },
+	{ .compatible = "pervasive,e2271cs021", .data = (void *)E2271CS021 },
+	{},
+};
+MODULE_DEVICE_TABLE(of, repaper_of_match);
+
+static const struct spi_device_id repaper_id[] = {
+	{ "e1144cs021", E1144CS021 },
+	{ "e1190cs021", E1190CS021 },
+	{ "e2200cs021", E2200CS021 },
+	{ "e2271cs021", E2271CS021 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, repaper_id);
+
+static int repaper_probe(struct spi_device *spi)
+{
+	const struct drm_display_mode *mode;
+	const struct spi_device_id *spi_id;
+	struct device *dev = &spi->dev;
+	enum repaper_model model;
+	const char *thermal_zone;
+	struct repaper_epd *epd;
+	size_t line_buffer_size;
+	struct drm_device *drm;
+	const void *match;
+	int ret;
+
+	match = device_get_match_data(dev);
+	if (match) {
+		model = (enum repaper_model)(uintptr_t)match;
+	} else {
+		spi_id = spi_get_device_id(spi);
+		model = (enum repaper_model)spi_id->driver_data;
+	}
+
+	/* The SPI device is used to allocate dma memory */
+	if (!dev->coherent_dma_mask) {
+		ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_warn(dev, "Failed to set dma mask %d\n", ret);
+			return ret;
+		}
+	}
+
+	epd = devm_drm_dev_alloc(dev, &repaper_driver,
+				 struct repaper_epd, drm);
+	if (IS_ERR(epd))
+		return PTR_ERR(epd);
+
+	drm = &epd->drm;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+	drm->mode_config.funcs = &repaper_mode_config_funcs;
+
+	epd->spi = spi;
+
+	epd->panel_on = devm_gpiod_get(dev, "panel-on", GPIOD_OUT_LOW);
+	if (IS_ERR(epd->panel_on)) {
+		ret = PTR_ERR(epd->panel_on);
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "Failed to get gpio 'panel-on'\n");
+		return ret;
+	}
+
+	epd->discharge = devm_gpiod_get(dev, "discharge", GPIOD_OUT_LOW);
+	if (IS_ERR(epd->discharge)) {
+		ret = PTR_ERR(epd->discharge);
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "Failed to get gpio 'discharge'\n");
+		return ret;
+	}
+
+	epd->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(epd->reset)) {
+		ret = PTR_ERR(epd->reset);
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
+		return ret;
+	}
+
+	epd->busy = devm_gpiod_get(dev, "busy", GPIOD_IN);
+	if (IS_ERR(epd->busy)) {
+		ret = PTR_ERR(epd->busy);
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "Failed to get gpio 'busy'\n");
+		return ret;
+	}
+
+	if (!device_property_read_string(dev, "pervasive,thermal-zone",
+					 &thermal_zone)) {
+		epd->thermal = thermal_zone_get_zone_by_name(thermal_zone);
+		if (IS_ERR(epd->thermal)) {
+			DRM_DEV_ERROR(dev, "Failed to get thermal zone: %s\n", thermal_zone);
+			return PTR_ERR(epd->thermal);
+		}
+	}
+
+	switch (model) {
+	case E1144CS021:
+		mode = &repaper_e1144cs021_mode;
+		epd->channel_select = repaper_e1144cs021_cs;
+		epd->stage_time = 480;
+		epd->bytes_per_scan = 96 / 4;
+		epd->middle_scan = true; /* data-scan-data */
+		epd->pre_border_byte = false;
+		epd->border_byte = REPAPER_BORDER_BYTE_ZERO;
+		break;
+
+	case E1190CS021:
+		mode = &repaper_e1190cs021_mode;
+		epd->channel_select = repaper_e1190cs021_cs;
+		epd->stage_time = 480;
+		epd->bytes_per_scan = 128 / 4 / 2;
+		epd->middle_scan = false; /* scan-data-scan */
+		epd->pre_border_byte = false;
+		epd->border_byte = REPAPER_BORDER_BYTE_SET;
+		break;
+
+	case E2200CS021:
+		mode = &repaper_e2200cs021_mode;
+		epd->channel_select = repaper_e2200cs021_cs;
+		epd->stage_time = 480;
+		epd->bytes_per_scan = 96 / 4;
+		epd->middle_scan = true; /* data-scan-data */
+		epd->pre_border_byte = true;
+		epd->border_byte = REPAPER_BORDER_BYTE_NONE;
+		break;
+
+	case E2271CS021:
+		epd->border = devm_gpiod_get(dev, "border", GPIOD_OUT_LOW);
+		if (IS_ERR(epd->border)) {
+			ret = PTR_ERR(epd->border);
+			if (ret != -EPROBE_DEFER)
+				DRM_DEV_ERROR(dev, "Failed to get gpio 'border'\n");
+			return ret;
+		}
+
+		mode = &repaper_e2271cs021_mode;
+		epd->channel_select = repaper_e2271cs021_cs;
+		epd->stage_time = 630;
+		epd->bytes_per_scan = 176 / 4;
+		epd->middle_scan = true; /* data-scan-data */
+		epd->pre_border_byte = true;
+		epd->border_byte = REPAPER_BORDER_BYTE_NONE;
+		break;
+
+	default:
+		return -ENODEV;
+	}
+
+	epd->mode = mode;
+	epd->width = mode->hdisplay;
+	epd->height = mode->vdisplay;
+	epd->factored_stage_time = epd->stage_time;
+
+	line_buffer_size = 2 * epd->width / 8 + epd->bytes_per_scan + 2;
+	epd->line_buffer = devm_kzalloc(dev, line_buffer_size, GFP_KERNEL);
+	if (!epd->line_buffer)
+		return -ENOMEM;
+
+	epd->current_frame = devm_kzalloc(dev, epd->width * epd->height / 8,
+					  GFP_KERNEL);
+	if (!epd->current_frame)
+		return -ENOMEM;
+
+	drm->mode_config.min_width = mode->hdisplay;
+	drm->mode_config.max_width = mode->hdisplay;
+	drm->mode_config.min_height = mode->vdisplay;
+	drm->mode_config.max_height = mode->vdisplay;
+
+	drm_connector_helper_add(&epd->connector, &repaper_connector_hfuncs);
+	ret = drm_connector_init(drm, &epd->connector, &repaper_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+
+	ret = drm_simple_display_pipe_init(drm, &epd->pipe, &repaper_pipe_funcs,
+					   repaper_formats, ARRAY_SIZE(repaper_formats),
+					   NULL, &epd->connector);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	DRM_DEBUG_DRIVER("SPI speed: %uMHz\n", spi->max_speed_hz / 1000000);
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void repaper_remove(struct spi_device *spi)
+{
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void repaper_shutdown(struct spi_device *spi)
+{
+	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver repaper_spi_driver = {
+	.driver = {
+		.name = "repaper",
+		.of_match_table = repaper_of_match,
+	},
+	.id_table = repaper_id,
+	.probe = repaper_probe,
+	.remove = repaper_remove,
+	.shutdown = repaper_shutdown,
+};
+module_spi_driver(repaper_spi_driver);
+
+MODULE_DESCRIPTION("Pervasive Displays RePaper DRM driver");
+MODULE_AUTHOR("Noralf Trønnes");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tiny/sharp-memory.c b/drivers/gpu/drm/tiny/sharp-memory.c
new file mode 100644
index 000000000..7efd7b567
--- /dev/null
+++ b/drivers/gpu/drm/tiny/sharp-memory.c
@@ -0,0 +1,668 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_rect.h>
+#include <linux/bitrev.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pwm.h>
+#include <linux/spi/spi.h>
+
+#define SHARP_MODE_PERIOD 8
+#define SHARP_ADDR_PERIOD 8
+#define SHARP_DUMMY_PERIOD 8
+
+#define SHARP_MEMORY_DISPLAY_MAINTAIN_MODE 0
+#define SHARP_MEMORY_DISPLAY_UPDATE_MODE 1
+#define SHARP_MEMORY_DISPLAY_CLEAR_MODE 4
+
+enum sharp_memory_model {
+	LS010B7DH04,
+	LS011B7DH03,
+	LS012B7DD01,
+	LS013B7DH03,
+	LS013B7DH05,
+	LS018B7DH02,
+	LS027B7DH01,
+	LS027B7DH01A,
+	LS032B7DD02,
+	LS044Q7DH01,
+};
+
+enum sharp_memory_vcom_mode {
+	SHARP_MEMORY_SOFTWARE_VCOM,
+	SHARP_MEMORY_EXTERNAL_VCOM,
+	SHARP_MEMORY_PWM_VCOM
+};
+
+struct sharp_memory_device {
+	struct drm_device drm;
+	struct spi_device *spi;
+
+	const struct drm_display_mode *mode;
+
+	struct drm_crtc crtc;
+	struct drm_plane plane;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+
+	struct gpio_desc *enable_gpio;
+
+	struct task_struct *sw_vcom_signal;
+	struct pwm_device *pwm_vcom_signal;
+
+	enum sharp_memory_vcom_mode vcom_mode;
+	u8 vcom;
+
+	u32 pitch;
+	u32 tx_buffer_size;
+	u8 *tx_buffer;
+
+	/* When vcom_mode == "software" a kthread is used to periodically send a
+	 * 'maintain display' message over spi. This mutex ensures tx_buffer access
+	 * and spi bus usage is synchronized in this case.
+	 */
+	struct mutex tx_mutex;
+};
+
+static inline int sharp_memory_spi_write(struct spi_device *spi, void *buf, size_t len)
+{
+	/* Reverse the bit order */
+	for (u8 *b = buf; b < ((u8 *)buf) + len; ++b)
+		*b = bitrev8(*b);
+
+	return spi_write(spi, buf, len);
+}
+
+static inline struct sharp_memory_device *drm_to_sharp_memory_device(struct drm_device *drm)
+{
+	return container_of(drm, struct sharp_memory_device, drm);
+}
+
+DEFINE_DRM_GEM_DMA_FOPS(sharp_memory_fops);
+
+static const struct drm_driver sharp_memory_drm_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &sharp_memory_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.name			= "sharp_memory_display",
+	.desc			= "Sharp Display Memory LCD",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static inline void sharp_memory_set_tx_buffer_mode(u8 *buffer, u8 mode, u8 vcom)
+{
+	*buffer = mode | (vcom << 1);
+}
+
+static inline void sharp_memory_set_tx_buffer_addresses(u8 *buffer,
+							struct drm_rect clip,
+							u32 pitch)
+{
+	for (u32 line = 0; line < clip.y2; ++line)
+		buffer[line * pitch] = line + 1;
+}
+
+static void sharp_memory_set_tx_buffer_data(u8 *buffer,
+					    struct drm_framebuffer *fb,
+					    const struct iosys_map *vmap,
+					    struct drm_rect clip,
+					    u32 pitch,
+					    struct drm_format_conv_state *fmtcnv_state)
+{
+	int ret;
+	struct iosys_map dst;
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret)
+		return;
+
+	iosys_map_set_vaddr(&dst, buffer);
+
+	drm_fb_xrgb8888_to_mono(&dst, &pitch, vmap, fb, &clip, fmtcnv_state);
+
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+}
+
+static int sharp_memory_update_display(struct sharp_memory_device *smd,
+				       struct drm_framebuffer *fb,
+				       const struct iosys_map *vmap,
+				       struct drm_rect clip,
+				       struct drm_format_conv_state *fmtcnv_state)
+{
+	int ret;
+	u32 pitch = smd->pitch;
+	u8 vcom = smd->vcom;
+	u8 *tx_buffer = smd->tx_buffer;
+	u32 tx_buffer_size = smd->tx_buffer_size;
+
+	mutex_lock(&smd->tx_mutex);
+
+	/* Populate the transmit buffer with frame data */
+	sharp_memory_set_tx_buffer_mode(&tx_buffer[0],
+					SHARP_MEMORY_DISPLAY_UPDATE_MODE, vcom);
+	sharp_memory_set_tx_buffer_addresses(&tx_buffer[1], clip, pitch);
+	sharp_memory_set_tx_buffer_data(&tx_buffer[2], fb, vmap, clip, pitch, fmtcnv_state);
+
+	ret = sharp_memory_spi_write(smd->spi, tx_buffer, tx_buffer_size);
+
+	mutex_unlock(&smd->tx_mutex);
+
+	return ret;
+}
+
+static int sharp_memory_maintain_display(struct sharp_memory_device *smd)
+{
+	int ret;
+	u8 vcom = smd->vcom;
+	u8 *tx_buffer = smd->tx_buffer;
+
+	mutex_lock(&smd->tx_mutex);
+
+	sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_MAINTAIN_MODE, vcom);
+	tx_buffer[1] = 0; /* Write dummy data */
+	ret = sharp_memory_spi_write(smd->spi, tx_buffer, 2);
+
+	mutex_unlock(&smd->tx_mutex);
+
+	return ret;
+}
+
+static int sharp_memory_clear_display(struct sharp_memory_device *smd)
+{
+	int ret;
+	u8 vcom = smd->vcom;
+	u8 *tx_buffer = smd->tx_buffer;
+
+	mutex_lock(&smd->tx_mutex);
+
+	sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_CLEAR_MODE, vcom);
+	tx_buffer[1] = 0; /* write dummy data */
+	ret = sharp_memory_spi_write(smd->spi, tx_buffer, 2);
+
+	mutex_unlock(&smd->tx_mutex);
+
+	return ret;
+}
+
+static void sharp_memory_fb_dirty(struct drm_framebuffer *fb, const struct iosys_map *vmap,
+				  struct drm_rect *rect,
+				  struct drm_format_conv_state *fmtconv_state)
+{
+	struct drm_rect clip;
+	struct sharp_memory_device *smd = drm_to_sharp_memory_device(fb->dev);
+
+	/* Always update a full line regardless of what is dirty */
+	clip.x1 = 0;
+	clip.x2 = fb->width;
+	clip.y1 = rect->y1;
+	clip.y2 = rect->y2;
+
+	sharp_memory_update_display(smd, fb, vmap, clip, fmtconv_state);
+}
+
+static int sharp_memory_plane_atomic_check(struct drm_plane *plane,
+					   struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct sharp_memory_device *smd;
+	struct drm_crtc_state *crtc_state;
+
+	smd = container_of(plane, struct sharp_memory_device, plane);
+	crtc_state = drm_atomic_get_new_crtc_state(state, &smd->crtc);
+
+	return drm_atomic_helper_check_plane_state(plane_state, crtc_state,
+						   DRM_PLANE_NO_SCALING,
+						   DRM_PLANE_NO_SCALING,
+						   false, false);
+}
+
+static void sharp_memory_plane_atomic_update(struct drm_plane *plane,
+					     struct drm_atomic_commit *state)
+{
+	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_plane_state *plane_state = plane->state;
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct sharp_memory_device *smd;
+	struct drm_rect rect;
+
+	smd = container_of(plane, struct sharp_memory_device, plane);
+	if (!smd->crtc.state->active)
+		return;
+
+	if (drm_atomic_helper_damage_merged(old_state, plane_state, &rect))
+		sharp_memory_fb_dirty(plane_state->fb, shadow_plane_state->data,
+				      &rect, &shadow_plane_state->fmtcnv_state);
+}
+
+static const struct drm_plane_helper_funcs sharp_memory_plane_helper_funcs = {
+	.prepare_fb = drm_gem_plane_helper_prepare_fb,
+	.atomic_check = sharp_memory_plane_atomic_check,
+	.atomic_update = sharp_memory_plane_atomic_update,
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+};
+
+static bool sharp_memory_format_mod_supported(struct drm_plane *plane,
+					      u32 format,
+					      u64 modifier)
+{
+	return modifier == DRM_FORMAT_MOD_LINEAR;
+}
+
+static const struct drm_plane_funcs sharp_memory_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	DRM_GEM_SHADOW_PLANE_FUNCS,
+	.format_mod_supported = sharp_memory_format_mod_supported,
+};
+
+static enum drm_mode_status sharp_memory_crtc_mode_valid(struct drm_crtc *crtc,
+							 const struct drm_display_mode *mode)
+{
+	struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev);
+
+	return drm_crtc_helper_mode_valid_fixed(crtc, mode, smd->mode);
+}
+
+static int sharp_memory_crtc_check(struct drm_crtc *crtc,
+				   struct drm_atomic_commit *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	int ret;
+
+	if (!crtc_state->enable)
+		goto out;
+
+	ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+	if (ret)
+		return ret;
+
+out:
+	return drm_atomic_add_affected_planes(state, crtc);
+}
+
+static int sharp_memory_sw_vcom_signal_thread(void *data)
+{
+	struct sharp_memory_device *smd = data;
+
+	while (!kthread_should_stop()) {
+		smd->vcom ^= 1; /* Toggle vcom */
+		sharp_memory_maintain_display(smd);
+		msleep(1000);
+	}
+
+	return 0;
+}
+
+static void sharp_memory_crtc_enable(struct drm_crtc *crtc,
+				     struct drm_atomic_commit *state)
+{
+	struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev);
+
+	sharp_memory_clear_display(smd);
+
+	if (smd->enable_gpio)
+		gpiod_set_value(smd->enable_gpio, 1);
+}
+
+static void sharp_memory_crtc_disable(struct drm_crtc *crtc,
+				      struct drm_atomic_commit *state)
+{
+	struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev);
+
+	sharp_memory_clear_display(smd);
+
+	if (smd->enable_gpio)
+		gpiod_set_value(smd->enable_gpio, 0);
+}
+
+static const struct drm_crtc_helper_funcs sharp_memory_crtc_helper_funcs = {
+	.mode_valid = sharp_memory_crtc_mode_valid,
+	.atomic_check = sharp_memory_crtc_check,
+	.atomic_enable = sharp_memory_crtc_enable,
+	.atomic_disable = sharp_memory_crtc_disable,
+};
+
+static const struct drm_crtc_funcs sharp_memory_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_encoder_funcs sharp_memory_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int sharp_memory_connector_get_modes(struct drm_connector *connector)
+{
+	struct sharp_memory_device *smd = drm_to_sharp_memory_device(connector->dev);
+
+	return drm_connector_helper_get_modes_fixed(connector, smd->mode);
+}
+
+static const struct drm_connector_helper_funcs sharp_memory_connector_hfuncs = {
+	.get_modes = sharp_memory_connector_get_modes,
+};
+
+static const struct drm_connector_funcs sharp_memory_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+
+};
+
+static const struct drm_mode_config_funcs sharp_memory_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static const struct drm_display_mode sharp_memory_ls010b7dh04_mode = {
+	DRM_SIMPLE_MODE(128, 128, 18, 18),
+};
+
+static const struct drm_display_mode sharp_memory_ls011b7dh03_mode = {
+	DRM_SIMPLE_MODE(160, 68, 25, 10),
+};
+
+static const struct drm_display_mode sharp_memory_ls012b7dd01_mode = {
+	DRM_SIMPLE_MODE(184, 38, 29, 6),
+};
+
+static const struct drm_display_mode sharp_memory_ls013b7dh03_mode = {
+	DRM_SIMPLE_MODE(128, 128, 23, 23),
+};
+
+static const struct drm_display_mode sharp_memory_ls013b7dh05_mode = {
+	DRM_SIMPLE_MODE(144, 168, 20, 24),
+};
+
+static const struct drm_display_mode sharp_memory_ls018b7dh02_mode = {
+	DRM_SIMPLE_MODE(230, 303, 27, 36),
+};
+
+static const struct drm_display_mode sharp_memory_ls027b7dh01_mode = {
+	DRM_SIMPLE_MODE(400, 240, 58, 35),
+};
+
+static const struct drm_display_mode sharp_memory_ls032b7dd02_mode = {
+	DRM_SIMPLE_MODE(336, 536, 42, 68),
+};
+
+static const struct drm_display_mode sharp_memory_ls044q7dh01_mode = {
+	DRM_SIMPLE_MODE(320, 240, 89, 67),
+};
+
+static const struct spi_device_id sharp_memory_ids[] = {
+	{"ls010b7dh04", (kernel_ulong_t)&sharp_memory_ls010b7dh04_mode},
+	{"ls011b7dh03", (kernel_ulong_t)&sharp_memory_ls011b7dh03_mode},
+	{"ls012b7dd01", (kernel_ulong_t)&sharp_memory_ls012b7dd01_mode},
+	{"ls013b7dh03", (kernel_ulong_t)&sharp_memory_ls013b7dh03_mode},
+	{"ls013b7dh05", (kernel_ulong_t)&sharp_memory_ls013b7dh05_mode},
+	{"ls018b7dh02", (kernel_ulong_t)&sharp_memory_ls018b7dh02_mode},
+	{"ls027b7dh01", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode},
+	{"ls027b7dh01a", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode},
+	{"ls032b7dd02", (kernel_ulong_t)&sharp_memory_ls032b7dd02_mode},
+	{"ls044q7dh01", (kernel_ulong_t)&sharp_memory_ls044q7dh01_mode},
+	{},
+};
+MODULE_DEVICE_TABLE(spi, sharp_memory_ids);
+
+static const struct of_device_id sharp_memory_of_match[] = {
+	{.compatible = "sharp,ls010b7dh04", &sharp_memory_ls010b7dh04_mode},
+	{.compatible = "sharp,ls011b7dh03", &sharp_memory_ls011b7dh03_mode},
+	{.compatible = "sharp,ls012b7dd01", &sharp_memory_ls012b7dd01_mode},
+	{.compatible = "sharp,ls013b7dh03", &sharp_memory_ls013b7dh03_mode},
+	{.compatible = "sharp,ls013b7dh05", &sharp_memory_ls013b7dh05_mode},
+	{.compatible = "sharp,ls018b7dh02", &sharp_memory_ls018b7dh02_mode},
+	{.compatible = "sharp,ls027b7dh01", &sharp_memory_ls027b7dh01_mode},
+	{.compatible = "sharp,ls027b7dh01a", &sharp_memory_ls027b7dh01_mode},
+	{.compatible = "sharp,ls032b7dd02", &sharp_memory_ls032b7dd02_mode},
+	{.compatible = "sharp,ls044q7dh01", &sharp_memory_ls044q7dh01_mode},
+	{},
+};
+MODULE_DEVICE_TABLE(of, sharp_memory_of_match);
+
+static const u32 sharp_memory_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+static int sharp_memory_pipe_init(struct drm_device *dev,
+				  struct sharp_memory_device *smd,
+				  const u32 *formats, unsigned int format_count,
+				  const u64 *format_modifiers)
+{
+	int ret;
+	struct drm_encoder *encoder = &smd->encoder;
+	struct drm_plane *plane = &smd->plane;
+	struct drm_crtc *crtc = &smd->crtc;
+	struct drm_connector *connector = &smd->connector;
+
+	drm_plane_helper_add(plane, &sharp_memory_plane_helper_funcs);
+	ret = drm_universal_plane_init(dev, plane, 0,
+				       &sharp_memory_plane_funcs,
+				       formats, format_count,
+				       format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+
+	drm_crtc_helper_add(crtc, &sharp_memory_crtc_helper_funcs);
+	ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
+					&sharp_memory_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+	ret = drm_encoder_init(dev, encoder, &sharp_memory_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+
+	ret = drm_connector_init(&smd->drm, &smd->connector,
+				 &sharp_memory_connector_funcs,
+				 DRM_MODE_CONNECTOR_SPI);
+	if (ret)
+		return ret;
+
+	drm_connector_helper_add(&smd->connector,
+				 &sharp_memory_connector_hfuncs);
+
+	return drm_connector_attach_encoder(connector, encoder);
+}
+
+static int sharp_memory_init_pwm_vcom_signal(struct sharp_memory_device *smd)
+{
+	int ret;
+	struct device *dev = &smd->spi->dev;
+	struct pwm_state pwm_state;
+
+	smd->pwm_vcom_signal = devm_pwm_get(dev, NULL);
+	if (IS_ERR(smd->pwm_vcom_signal))
+		return dev_err_probe(dev, PTR_ERR(smd->pwm_vcom_signal),
+				     "Could not get pwm device\n");
+
+	pwm_init_state(smd->pwm_vcom_signal, &pwm_state);
+	pwm_set_relative_duty_cycle(&pwm_state, 1, 10);
+	pwm_state.enabled = true;
+	ret = pwm_apply_might_sleep(smd->pwm_vcom_signal, &pwm_state);
+	if (ret)
+		return dev_err_probe(dev, -EINVAL, "Could not apply pwm state\n");
+
+	return 0;
+}
+
+static int sharp_memory_probe(struct spi_device *spi)
+{
+	int ret;
+	struct device *dev;
+	struct sharp_memory_device *smd;
+	struct drm_device *drm;
+	const char *vcom_mode_str;
+
+	dev = &spi->dev;
+
+	ret = spi_setup(spi);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to setup spi device\n");
+
+	if (!dev->coherent_dma_mask) {
+		ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to set dma mask\n");
+	}
+
+	smd = devm_drm_dev_alloc(dev, &sharp_memory_drm_driver,
+				 struct sharp_memory_device, drm);
+	if (IS_ERR(smd))
+		return PTR_ERR(smd);
+
+	spi_set_drvdata(spi, smd);
+
+	smd->spi = spi;
+	drm = &smd->drm;
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize drm config\n");
+
+	smd->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+	if (!smd->enable_gpio)
+		dev_warn(dev, "Enable gpio not defined\n");
+
+	drm->mode_config.funcs = &sharp_memory_mode_config_funcs;
+	smd->mode = spi_get_device_match_data(spi);
+
+	smd->pitch = (SHARP_ADDR_PERIOD + smd->mode->hdisplay + SHARP_DUMMY_PERIOD) / 8;
+	smd->tx_buffer_size = (SHARP_MODE_PERIOD +
+			       (SHARP_ADDR_PERIOD + (smd->mode->hdisplay) + SHARP_DUMMY_PERIOD) *
+			       smd->mode->vdisplay) / 8;
+
+	smd->tx_buffer = devm_kzalloc(dev, smd->tx_buffer_size, GFP_KERNEL);
+	if (!smd->tx_buffer)
+		return -ENOMEM;
+
+	mutex_init(&smd->tx_mutex);
+
+	/*
+	 * VCOM is a signal that prevents DC bias from being built up in
+	 * the panel resulting in pixels being forever stuck in one state.
+	 *
+	 * This driver supports three different methods to generate this
+	 * signal depending on EXTMODE pin:
+	 *
+	 * software (EXTMODE = L) - This mode uses a kthread to
+	 * periodically send a "maintain display" message to the display,
+	 * toggling the vcom bit on and off with each message
+	 *
+	 * external (EXTMODE = H) - This mode relies on an external
+	 * clock to generate the signal on the EXTCOMM pin
+	 *
+	 * pwm (EXTMODE = H) - This mode uses a pwm device to generate
+	 * the signal on the EXTCOMM pin
+	 *
+	 */
+	if (device_property_read_string(dev, "sharp,vcom-mode", &vcom_mode_str))
+		return dev_err_probe(dev, -EINVAL,
+				     "Unable to find sharp,vcom-mode node in device tree\n");
+
+	if (!strcmp("software", vcom_mode_str)) {
+		smd->vcom_mode = SHARP_MEMORY_SOFTWARE_VCOM;
+		smd->sw_vcom_signal = kthread_run(sharp_memory_sw_vcom_signal_thread,
+						  smd, "sw_vcom_signal");
+
+	} else if (!strcmp("external", vcom_mode_str)) {
+		smd->vcom_mode = SHARP_MEMORY_EXTERNAL_VCOM;
+
+	} else if (!strcmp("pwm", vcom_mode_str)) {
+		smd->vcom_mode = SHARP_MEMORY_PWM_VCOM;
+		ret = sharp_memory_init_pwm_vcom_signal(smd);
+		if (ret)
+			return ret;
+	} else {
+		return dev_err_probe(dev, -EINVAL, "Invalid value set for vcom-mode\n");
+	}
+
+	drm->mode_config.min_width = smd->mode->hdisplay;
+	drm->mode_config.max_width = smd->mode->hdisplay;
+	drm->mode_config.min_height = smd->mode->vdisplay;
+	drm->mode_config.max_height = smd->mode->vdisplay;
+
+	ret = sharp_memory_pipe_init(drm, smd, sharp_memory_formats,
+				     ARRAY_SIZE(sharp_memory_formats),
+				     NULL);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize display pipeline.\n");
+
+	drm_plane_enable_fb_damage_clips(&smd->plane);
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register drm device.\n");
+
+	drm_client_setup(drm, NULL);
+
+	return 0;
+}
+
+static void sharp_memory_remove(struct spi_device *spi)
+{
+	struct sharp_memory_device *smd = spi_get_drvdata(spi);
+
+	drm_dev_unplug(&smd->drm);
+	drm_atomic_helper_shutdown(&smd->drm);
+
+	switch (smd->vcom_mode) {
+	case SHARP_MEMORY_SOFTWARE_VCOM:
+		kthread_stop(smd->sw_vcom_signal);
+		break;
+
+	case SHARP_MEMORY_EXTERNAL_VCOM:
+		break;
+
+	case SHARP_MEMORY_PWM_VCOM:
+		pwm_disable(smd->pwm_vcom_signal);
+		break;
+	}
+}
+
+static struct spi_driver sharp_memory_spi_driver = {
+	.driver = {
+		.name = "sharp_memory",
+		.of_match_table = sharp_memory_of_match,
+	},
+	.probe = sharp_memory_probe,
+	.remove = sharp_memory_remove,
+	.id_table = sharp_memory_ids,
+};
+module_spi_driver(sharp_memory_spi_driver);
+
+MODULE_AUTHOR("Alex Lanzano <lanzano.alex@gmail.com>");
+MODULE_DESCRIPTION("SPI Protocol driver for the sharp_memory display");
+MODULE_LICENSE("GPL");