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, 195 insertions, 0 deletions

diff --git a/drivers/gpu/host1x/mipi.c b/drivers/gpu/host1x/mipi.c
new file mode 100644
index 000000000..988681423
--- /dev/null
+++ b/drivers/gpu/host1x/mipi.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 NVIDIA Corporation
+ * Copyright (C) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/tegra-mipi-cal.h>
+
+/* only need to support one provider */
+static struct {
+	struct device_node *np;
+	const struct tegra_mipi_ops *ops;
+} provider;
+
+/**
+ * tegra_mipi_enable - Enable the Tegra MIPI calibration device.
+ * @device: Handle to the Tegra MIPI calibration device.
+ *
+ * This calls the enable sequence for the Tegra MIPI calibration device.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int tegra_mipi_enable(struct tegra_mipi_device *device)
+{
+	if (device->ops->enable)
+		return device->ops->enable(device);
+
+	return 0;
+}
+EXPORT_SYMBOL(tegra_mipi_enable);
+
+/**
+ * tegra_mipi_disable - Disable the Tegra MIPI calibration device.
+ * @device: Handle to the Tegra MIPI calibration device.
+ *
+ * This calls the disable sequence for the Tegra MIPI calibration device.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int tegra_mipi_disable(struct tegra_mipi_device *device)
+{
+	if (device->ops->disable)
+		return device->ops->disable(device);
+
+	return 0;
+}
+EXPORT_SYMBOL(tegra_mipi_disable);
+
+/**
+ * tegra_mipi_start_calibration - Start the Tegra MIPI calibration sequence.
+ * @device: Handle to the Tegra MIPI calibration device.
+ *
+ * This initiates the calibration of CSI/DSI interfaces via the Tegra MIPI
+ * calibration device.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int tegra_mipi_start_calibration(struct tegra_mipi_device *device)
+{
+	if (device->ops->start_calibration)
+		return device->ops->start_calibration(device);
+
+	return 0;
+}
+EXPORT_SYMBOL(tegra_mipi_start_calibration);
+
+/**
+ * tegra_mipi_finish_calibration - Finish the Tegra MIPI calibration sequence.
+ * @device: Handle to the Tegra MIPI calibration device.
+ *
+ * This completes the calibration of CSI/DSI interfaces via the Tegra MIPI
+ * calibration device.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int tegra_mipi_finish_calibration(struct tegra_mipi_device *device)
+{
+	if (device->ops->finish_calibration)
+		return device->ops->finish_calibration(device);
+
+	return 0;
+}
+EXPORT_SYMBOL(tegra_mipi_finish_calibration);
+
+/**
+ * tegra_mipi_request - Request a Tegra MIPI calibration device.
+ * @device: Handle of the device requesting the MIPI calibration function.
+ * @np: Device node pointer of the device requesting the MIPI calibration
+ *	function.
+ *
+ * This function requests a reference to a Tegra MIPI calibration device.
+ *
+ * Returns a pointer to the Tegra MIPI calibration device on success,
+ * or an ERR_PTR-encoded error code on failure.
+ */
+struct tegra_mipi_device *tegra_mipi_request(struct device *device,
+					     struct device_node *np)
+{
+	struct tegra_mipi_device *mipidev;
+	struct of_phandle_args args;
+	int err;
+
+	err = of_parse_phandle_with_args(np, "nvidia,mipi-calibrate",
+					 "#nvidia,mipi-calibrate-cells", 0,
+					 &args);
+	if (err < 0)
+		return ERR_PTR(err);
+
+	if (provider.np != args.np) {
+		err = -ENODEV;
+		goto out;
+	}
+
+	mipidev = kzalloc_obj(*mipidev);
+	if (!mipidev) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	mipidev->pdev = of_find_device_by_node(args.np);
+	if (!mipidev->pdev) {
+		err = -ENODEV;
+		goto free;
+	}
+
+	of_node_put(args.np);
+
+	mipidev->ops = provider.ops;
+	mipidev->pads = args.args[0];
+
+	return mipidev;
+
+free:
+	kfree(mipidev);
+out:
+	of_node_put(args.np);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(tegra_mipi_request);
+
+/**
+ * tegra_mipi_free - Free a Tegra MIPI calibration device.
+ * @mipidev: Handle to the Tegra MIPI calibration device.
+ *
+ * This function releases a reference to a Tegra MIPI calibration device
+ * previously requested by tegra_mipi_request().
+ */
+void tegra_mipi_free(struct tegra_mipi_device *mipidev)
+{
+	platform_device_put(mipidev->pdev);
+	kfree(mipidev);
+}
+EXPORT_SYMBOL(tegra_mipi_free);
+
+static void tegra_mipi_remove_provider(void *data)
+{
+	provider.np = NULL;
+	provider.ops = NULL;
+}
+
+/**
+ * devm_tegra_mipi_add_provider - Managed registration of a Tegra MIPI
+ *				  calibration function provider.
+ * @device: Handle to the device providing the MIPI calibration function.
+ * @np: Device node pointer of the device providing the MIPI calibration
+ *	function.
+ * @ops: Operations supported by the MIPI calibration device.
+ *
+ * This registers a device that provides MIPI calibration functions.
+ * For Tegra20 and Tegra30, this is the CSI block, while Tegra114 and
+ * newer SoC generations have a dedicated hardware block for these
+ * functions.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int devm_tegra_mipi_add_provider(struct device *device, struct device_node *np,
+				 const struct tegra_mipi_ops *ops)
+{
+	if (provider.np)
+		return -EBUSY;
+
+	provider.np = np;
+	provider.ops = ops;
+
+	return devm_add_action_or_reset(device, tegra_mipi_remove_provider, NULL);
+}
+EXPORT_SYMBOL(devm_tegra_mipi_add_provider);