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, 340 insertions, 0 deletions

diff --git a/drivers/input/mouse/sermouse.c b/drivers/input/mouse/sermouse.c
new file mode 100644
index 000000000..c334a4887
--- /dev/null
+++ b/drivers/input/mouse/sermouse.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (c) 1999-2001 Vojtech Pavlik
+ */
+
+/*
+ *  Serial mouse driver for Linux
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+
+#define DRIVER_DESC	"Serial mouse driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+static const char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
+					"Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
+					"Logitech MZ++ Mouse"};
+
+struct sermouse {
+	struct input_dev *dev;
+	signed char buf[8];
+	unsigned char count;
+	unsigned char type;
+	unsigned long last;
+	char phys[32];
+};
+
+/*
+ * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
+ * applies some prediction to the data, resulting in 96 updates per
+ * second, which is as good as a PS/2 or USB mouse.
+ */
+
+static void sermouse_process_msc(struct sermouse *sermouse, signed char data)
+{
+	struct input_dev *dev = sermouse->dev;
+	signed char *buf = sermouse->buf;
+
+	switch (sermouse->count) {
+
+		case 0:
+			if ((data & 0xf8) != 0x80)
+				return;
+			input_report_key(dev, BTN_LEFT,   !(data & 4));
+			input_report_key(dev, BTN_RIGHT,  !(data & 1));
+			input_report_key(dev, BTN_MIDDLE, !(data & 2));
+			break;
+
+		case 1:
+		case 3:
+			input_report_rel(dev, REL_X, data / 2);
+			input_report_rel(dev, REL_Y, -buf[1]);
+			buf[0] = data - data / 2;
+			break;
+
+		case 2:
+		case 4:
+			input_report_rel(dev, REL_X, buf[0]);
+			input_report_rel(dev, REL_Y, buf[1] - data);
+			buf[1] = data / 2;
+			break;
+	}
+
+	input_sync(dev);
+
+	if (++sermouse->count == 5)
+		sermouse->count = 0;
+}
+
+/*
+ * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
+ * generates events. With prediction it gets 80 updates/sec, assuming
+ * standard 3-byte packets and 1200 bps.
+ */
+
+static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
+{
+	struct input_dev *dev = sermouse->dev;
+	signed char *buf = sermouse->buf;
+
+	if (data & 0x40)
+		sermouse->count = 0;
+	else if (sermouse->count == 0)
+		return;
+
+	switch (sermouse->count) {
+
+		case 0:
+			buf[1] = data;
+			input_report_key(dev, BTN_LEFT,   (data >> 5) & 1);
+			input_report_key(dev, BTN_RIGHT,  (data >> 4) & 1);
+			break;
+
+		case 1:
+			buf[2] = data;
+			data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
+			input_report_rel(dev, REL_X, data / 2);
+			input_report_rel(dev, REL_Y, buf[4]);
+			buf[3] = data - data / 2;
+			break;
+
+		case 2:
+			/* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
+			if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
+				input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
+			buf[0] = buf[1];
+
+			data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
+			input_report_rel(dev, REL_X, buf[3]);
+			input_report_rel(dev, REL_Y, data - buf[4]);
+			buf[4] = data / 2;
+			break;
+
+		case 3:
+
+			switch (sermouse->type) {
+
+				case SERIO_MS:
+					sermouse->type = SERIO_MP;
+					fallthrough;
+
+				case SERIO_MP:
+					if ((data >> 2) & 3) break;	/* M++ Wireless Extension packet. */
+					input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
+					input_report_key(dev, BTN_SIDE,   (data >> 4) & 1);
+					break;
+
+				case SERIO_MZP:
+				case SERIO_MZPP:
+					input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);
+					fallthrough;
+
+				case SERIO_MZ:
+					input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
+					input_report_rel(dev, REL_WHEEL,  (data & 8) - (data & 7));
+					break;
+			}
+
+			break;
+
+		case 4:
+		case 6:	/* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
+			buf[1] = (data >> 2) & 0x0f;
+			break;
+
+		case 5:
+		case 7: /* Ignore anything besides MZ++ */
+			if (sermouse->type != SERIO_MZPP)
+				break;
+
+			switch (buf[1]) {
+
+				case 1: /* Extra mouse info */
+
+					input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
+					input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
+					input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
+
+					break;
+
+				default: /* We don't decode anything else yet. */
+
+					printk(KERN_WARNING
+						"sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
+					break;
+			}
+
+			break;
+	}
+
+	input_sync(dev);
+
+	sermouse->count++;
+}
+
+/*
+ * sermouse_interrupt() handles incoming characters, either gathering them into
+ * packets or passing them to the command routine as command output.
+ */
+
+static irqreturn_t sermouse_interrupt(struct serio *serio,
+		unsigned char data, unsigned int flags)
+{
+	struct sermouse *sermouse = serio_get_drvdata(serio);
+
+	if (time_after(jiffies, sermouse->last + HZ/10))
+		sermouse->count = 0;
+
+	sermouse->last = jiffies;
+
+	if (sermouse->type > SERIO_SUN)
+		sermouse_process_ms(sermouse, data);
+	else
+		sermouse_process_msc(sermouse, data);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * sermouse_disconnect() cleans up after we don't want talk
+ * to the mouse anymore.
+ */
+
+static void sermouse_disconnect(struct serio *serio)
+{
+	struct sermouse *sermouse = serio_get_drvdata(serio);
+
+	serio_close(serio);
+	serio_set_drvdata(serio, NULL);
+	input_unregister_device(sermouse->dev);
+	kfree(sermouse);
+}
+
+/*
+ * sermouse_connect() is a callback form the serio module when
+ * an unhandled serio port is found.
+ */
+
+static int sermouse_connect(struct serio *serio, struct serio_driver *drv)
+{
+	struct sermouse *sermouse;
+	struct input_dev *input_dev;
+	unsigned char c = serio->id.extra;
+	int err = -ENOMEM;
+
+	sermouse = kzalloc_obj(*sermouse);
+	input_dev = input_allocate_device();
+	if (!sermouse || !input_dev)
+		goto fail1;
+
+	sermouse->dev = input_dev;
+	snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);
+	sermouse->type = serio->id.proto;
+
+	input_dev->name = sermouse_protocols[sermouse->type];
+	input_dev->phys = sermouse->phys;
+	input_dev->id.bustype = BUS_RS232;
+	input_dev->id.vendor  = sermouse->type;
+	input_dev->id.product = c;
+	input_dev->id.version = 0x0100;
+	input_dev->dev.parent = &serio->dev;
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+	input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
+		BIT_MASK(BTN_RIGHT);
+	input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
+
+	if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);
+	if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);
+	if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);
+	if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);
+	if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);
+
+	serio_set_drvdata(serio, sermouse);
+
+	err = serio_open(serio, drv);
+	if (err)
+		goto fail2;
+
+	err = input_register_device(sermouse->dev);
+	if (err)
+		goto fail3;
+
+	return 0;
+
+ fail3:	serio_close(serio);
+ fail2:	serio_set_drvdata(serio, NULL);
+ fail1:	input_free_device(input_dev);
+	kfree(sermouse);
+	return err;
+}
+
+static struct serio_device_id sermouse_serio_ids[] = {
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MSC,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_SUN,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MS,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MP,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MZ,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MZP,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MZPP,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);
+
+static struct serio_driver sermouse_drv = {
+	.driver		= {
+		.name	= "sermouse",
+	},
+	.description	= DRIVER_DESC,
+	.id_table	= sermouse_serio_ids,
+	.interrupt	= sermouse_interrupt,
+	.connect	= sermouse_connect,
+	.disconnect	= sermouse_disconnect,
+};
+
+module_serio_driver(sermouse_drv);