drm/amd/display: Attach blend mode property for alpha planes

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[Why & How]
drm_mode_config_validate() warns when a plane exposes an alpha-capable
pixel format without a blend_mode_property. amdgpu DM only created that
property for overlay planes, so PRIMARY and CURSOR triggered the warning
on every probe and reload in kernel 7.2.

Create the blend mode property for every plane that advertises an alpha
format. Keep overlay-only alpha_property. Cursor advertises only
pre-multiplied blend mode because native cursor programming is
pre-multiplied.

Assisted-by: Cursor:Claude-Opus-4.8
Signed-off-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Reviewed-by: Sun peng (Leo) Li <sunpeng.li@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Ray Wu 2026-09-08 18:10:57 +08:00 • committed by Alex Deucher

parent 7f035f99c3

commit 44139872f2

1 changed files with 30 additions and 0 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c

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