drm/amd/display: Attach only plane updates that actually changed

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[Why & How]
Cache the last programmed dc_flip_addrs/dc_plane_info/dc_scaling_info in
dm_plane_state and carry them across atomic_duplicate_state. In
amdgpu_dm_commit_planes() attach each flip_addr/plane_info/scaling_info
surface update only when it differs from the cache (memcmp), so an
address-only flip sends no plane_info/scaling_info update and stays on the
FAMS2 offload path.

Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: James Lin <pinglei.lin@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

James Lin 2026-08-28 10:13:33 +08:00 • committed by Alex Deucher

parent e3fe350998

commit 123f78c8fa

4 changed files with 101 additions and 9 deletions

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43

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

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14

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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32

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

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21

drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_plane_test.c

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