[PATCH v6 05/10] drm/amd/display: Add fixed matrix colorop to color pipeline

Insert a fixed matrix colorop as the first operation in the
amdgpu color pipeline, before the existing DEGAM 1D curve. This
allows userspace to select YUV-to-RGB conversion via the color
pipeline for YCbCr framebuffers.

The fixed matrix colorop advertises support for all six YUV-to-RGB
conversion presets:
  - YUV601/709/2020 full-range to RGB
  - YUV601/709/2020 limited-range to RGB

Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Alex Hung <[email protected]>
Tested-by: Robert Mader <[email protected]>
---
 .../amd/display/amdgpu_dm/amdgpu_dm_colorop.c | 27 ++++++++++++++++++-
 .../amd/display/amdgpu_dm/amdgpu_dm_colorop.h |  1 +
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.c
index 056a76b88f43..1ed12cdce317 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.c
@@ -55,6 +55,14 @@ const u64 amdgpu_dm_supported_blnd_tfs =
 	BIT(DRM_COLOROP_1D_CURVE_GAMMA22);
 EXPORT_IF_KUNIT(amdgpu_dm_supported_blnd_tfs);
 
+const u64 amdgpu_dm_supported_fm =
+	BIT(DRM_COLOROP_FM_YCBCR601_FULL_RGB) |
+	BIT(DRM_COLOROP_FM_YCBCR601_LIMITED_RGB) |
+	BIT(DRM_COLOROP_FM_YCBCR709_FULL_RGB) |
+	BIT(DRM_COLOROP_FM_YCBCR709_LIMITED_RGB) |
+	BIT(DRM_COLOROP_FM_YCBCR2020_NC_FULL_RGB) |
+	BIT(DRM_COLOROP_FM_YCBCR2020_NC_LIMITED_RGB);
+
 #define MAX_COLOR_PIPELINE_OPS 10
 
 #define LUT3D_SIZE		17
@@ -73,6 +81,23 @@ amdgpu_dm_build_default_pipeline(struct drm_device *dev, struct drm_plane *plane
 
 	memset(ops, 0, sizeof(ops));
 
+	/* Fixed Matrix (YUV to RGB) */
+	ops[i] = kzalloc_obj(*ops[0]);
+	if (!ops[i]) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	ret = drm_plane_colorop_fixed_matrix_init(dev, ops[i], plane, &dm_colorop_funcs,
+						  amdgpu_dm_supported_fm,
+						  DRM_COLOROP_FLAG_ALLOW_BYPASS);
+	if (ret)
+		goto cleanup;
+
+	list->type = ops[i]->base.id;
+
+	i++;
+
 	/* 1D curve - DEGAM TF */
 	ops[i] = kzalloc_obj(*ops[0]);
 	if (!ops[i]) {
@@ -86,7 +111,7 @@ amdgpu_dm_build_default_pipeline(struct drm_device *dev, struct drm_plane *plane
 	if (ret)
 		goto cleanup;
 
-	list->type = ops[i]->base.id;
+	drm_colorop_set_next_property(ops[i - 1], ops[i]);
 
 	i++;
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.h
index 77364d954d3b..7802efa5312d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.h
@@ -30,6 +30,7 @@
 extern const u64 amdgpu_dm_supported_degam_tfs;
 extern const u64 amdgpu_dm_supported_shaper_tfs;
 extern const u64 amdgpu_dm_supported_blnd_tfs;
+extern const u64 amdgpu_dm_supported_fm;
 
 int amdgpu_dm_initialize_default_pipeline(struct drm_plane *plane, struct drm_prop_enum_list *list);
 
-- 
2.55.0