[PATCH v2 2/3] drm/amd/display: fix missing blend-mode-prop warning for DCN

validate_blend_mode_for_alpha_formats() warns when a plane supports
formats with alpha but doesn't expose the blend mode property. Fix this
by adding the same overlay plane blend modes to primary plane, since
they are all universal planes in DCN-generation. Cursor planes support
ARGB8888 format and CURSOR_MODE_COLOR_PRE_MULTIPLIED_ALPHA is set by
default (other color formats are not implemented), so only expose
support to PREMULTI, which is the default blend mode on DRM.

Fixes: 860e748bddcc ("drm: ensure blend mode supported if pixel format with alpha exposed")
Signed-off-by: Melissa Wen <[email protected]>
---
 .../amd/display/amdgpu_dm/amdgpu_dm_plane.c    | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index 1b564cfe2120..a276f3730044 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1923,8 +1923,15 @@ int amdgpu_dm_plane_init(struct amdgpu_display_manager *dm,
 	if (res)
 		return res;
 
-	if (plane->type == DRM_PLANE_TYPE_OVERLAY &&
-	    plane_cap && plane_cap->per_pixel_alpha) {
+	/* TODO: Check which blend modes are supported in DCE-generation
+	 * planes, i.e. DC_PLANE_TYPE_DCE_RGB/UNDERLAY and expose blend mode
+	 * property accordingly.
+	 */
+	if ((plane->type == DRM_PLANE_TYPE_OVERLAY ||
+	     plane->type == DRM_PLANE_TYPE_PRIMARY) &&
+	    plane_cap &&
+	    plane_cap->type == DC_PLANE_TYPE_DCN_UNIVERSAL &&
+	    plane_cap->per_pixel_alpha) {
 		unsigned int blend_caps = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
 					  BIT(DRM_MODE_BLEND_PREMULTI) |
 					  BIT(DRM_MODE_BLEND_COVERAGE);
@@ -1933,6 +1940,13 @@ int amdgpu_dm_plane_init(struct amdgpu_display_manager *dm,
 		drm_plane_create_blend_mode_property(plane, blend_caps);
 	}
 
+	/* Cursor color format is set to CURSOR_MODE_COLOR_PRE_MULTIPLIED_ALPHA
+	 * by default, so only advertise DRM_MODE_BLEND_PREMULTI blend mode for
+	 * this type of plane.
+	 */
+	if (plane->type == DRM_PLANE_TYPE_CURSOR)
+		drm_plane_create_blend_mode_property(plane, BIT(DRM_MODE_BLEND_PREMULTI));
+
 	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
 		/*
 		 * Allow OVERLAY planes to be used as underlays by assigning an
-- 
2.53.0