drm/amd/display: Try RGB before YCbCr 4:4:4 in stream validationgrafted

amdgpu_dm_create_validate_stream_for_sink() walks encoding_order[] and
uses the first encoding that validates. YCbCr 4:4:4 is listed before
RGB, so an HDMI sink that advertises 4:4:4 gets YCbCr 4:4:4 whenever the
"color format" property is left at AUTO, even though RGB fits the same
link.

That contradicts the documented AUTO behaviour for HDMI in enum
drm_connector_color_format (RGB, falling back to YCbCr 4:2:0 only when
the bandwidth is not available or the mode is 4:2:0-only), which the
amdgpu implementation of the property also describes. It also leaves
the "Broadcast RGB" property without effect on such sinks, since the
quantization range it selects only applies to RGB output.

Try RGB first. The mask still holds every encoding the sink supports,
so a mode that cannot carry RGB falls back exactly as before.

For reference, v7.2 picked RGB here unless YCbCr 4:4:4 was forced
through debugfs, while earlier kernels picked YCbCr 4:4:4 for any HDMI
sink that advertised it.

Fixes: 0b0ff65d3ca1 ("drm/amd/display: Refactor stream validation")
Suggested-by: Adolfo Rodrigues <adolfotregosa@gmail.com>
Assisted-by: Claude Code:claude-fable-5-1
Signed-off-by: Adrian Betschart <adrian.betschart@cinemaone.ch>
Reviewed-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Adolfo Rodrigues <adolfotregosa@gmail.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 7de432bc753133764dc40d37f9388da56de251e7)

1 files changed, 185 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/dynapro.c b/drivers/input/touchscreen/dynapro.c
new file mode 100644
index 000000000..943ba8c2f
--- /dev/null
+++ b/drivers/input/touchscreen/dynapro.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Dynapro serial touchscreen driver
+ *
+ * Copyright (c) 2009 Tias Guns
+ * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
+ * Richard Lemon
+ */
+
+
+/*
+ * 2009/09/19 Tias Guns <tias@ulyssis.org>
+ *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+
+#define DRIVER_DESC	"Dynapro serial touchscreen driver"
+
+MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
+#define DYNAPRO_FORMAT_LENGTH 3
+#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
+
+#define DYNAPRO_MIN_XC 0
+#define DYNAPRO_MAX_XC 0x3ff
+#define DYNAPRO_MIN_YC 0
+#define DYNAPRO_MAX_YC 0x3ff
+
+#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
+#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
+#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct dynapro {
+	struct input_dev *dev;
+	struct serio *serio;
+	int idx;
+	unsigned char data[DYNAPRO_FORMAT_LENGTH];
+	char phys[32];
+};
+
+static void dynapro_process_data(struct dynapro *pdynapro)
+{
+	struct input_dev *dev = pdynapro->dev;
+
+	if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
+		input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
+		input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
+		input_report_key(dev, BTN_TOUCH,
+				 DYNAPRO_GET_TOUCHED(pdynapro->data));
+		input_sync(dev);
+
+		pdynapro->idx = 0;
+	}
+}
+
+static irqreturn_t dynapro_interrupt(struct serio *serio,
+		unsigned char data, unsigned int flags)
+{
+	struct dynapro *pdynapro = serio_get_drvdata(serio);
+
+	pdynapro->data[pdynapro->idx] = data;
+
+	if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
+		dynapro_process_data(pdynapro);
+	else
+		dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
+			pdynapro->data[0]);
+
+	return IRQ_HANDLED;
+}
+
+static void dynapro_disconnect(struct serio *serio)
+{
+	struct dynapro *pdynapro = serio_get_drvdata(serio);
+
+	input_get_device(pdynapro->dev);
+	input_unregister_device(pdynapro->dev);
+	serio_close(serio);
+	serio_set_drvdata(serio, NULL);
+	input_put_device(pdynapro->dev);
+	kfree(pdynapro);
+}
+
+/*
+ * dynapro_connect() is the routine that is called when someone adds a
+ * new serio device that supports dynapro protocol and registers it as
+ * an input device. This is usually accomplished using inputattach.
+ */
+
+static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
+{
+	struct dynapro *pdynapro;
+	struct input_dev *input_dev;
+	int err;
+
+	pdynapro = kzalloc_obj(*pdynapro);
+	input_dev = input_allocate_device();
+	if (!pdynapro || !input_dev) {
+		err = -ENOMEM;
+		goto fail1;
+	}
+
+	pdynapro->serio = serio;
+	pdynapro->dev = input_dev;
+	scnprintf(pdynapro->phys, sizeof(pdynapro->phys),
+		  "%s/input0", serio->phys);
+
+	input_dev->name = "Dynapro Serial TouchScreen";
+	input_dev->phys = pdynapro->phys;
+	input_dev->id.bustype = BUS_RS232;
+	input_dev->id.vendor = SERIO_DYNAPRO;
+	input_dev->id.product = 0;
+	input_dev->id.version = 0x0001;
+	input_dev->dev.parent = &serio->dev;
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+	input_set_abs_params(pdynapro->dev, ABS_X,
+			     DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
+	input_set_abs_params(pdynapro->dev, ABS_Y,
+			     DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
+
+	serio_set_drvdata(serio, pdynapro);
+
+	err = serio_open(serio, drv);
+	if (err)
+		goto fail2;
+
+	err = input_register_device(pdynapro->dev);
+	if (err)
+		goto fail3;
+
+	return 0;
+
+ fail3:	serio_close(serio);
+ fail2:	serio_set_drvdata(serio, NULL);
+ fail1:	input_free_device(input_dev);
+	kfree(pdynapro);
+	return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static const struct serio_device_id dynapro_serio_ids[] = {
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_DYNAPRO,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
+
+static struct serio_driver dynapro_drv = {
+	.driver		= {
+		.name	= "dynapro",
+	},
+	.description	= DRIVER_DESC,
+	.id_table	= dynapro_serio_ids,
+	.interrupt	= dynapro_interrupt,
+	.connect	= dynapro_connect,
+	.disconnect	= dynapro_disconnect,
+};
+
+module_serio_driver(dynapro_drv);