drm/amd/display: Read sink freesync support via mccs

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If EDID AMD VSDB declares that sink supports MCCS method for freesync
usage, send mccs request to understand sink freesync current supporting
state.

If sink supports freesync but user toggles OSD to turn off it, disable
freesync.

If HDMI sink doesn't support MCCS method for freesync usage, disable
freesync as well.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wayne Lin 2026-03-03 13:55:42 +08:00 • committed by Alex Deucher

parent 72022bad01

commit 6f71d5dd32

6 changed files with 197 additions and 0 deletions

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8

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

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165

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

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1

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

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4

drivers/gpu/drm/amd/display/dc/dc_types.h

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5

drivers/gpu/drm/amd/display/dc/dm_helpers.h

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14

drivers/gpu/drm/amd/display/dc/link/link_detection.c

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