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drm/amdgpu/display - only update eDP's backlight level when necessary

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[Why]
The original logic is to update eDP's backlight level
on every amdgpu dm atomic commit, which causes excessive
DMUB write. As a result, when playing game or moving window
around, DMUB timeout and system lagging are observed.

[How]
We only need to update eDP's backlight level when current level
doesn't match requested level.

Signed-off-by: Zhan Liu <zhan.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Zhan Liu 2021-07-08 00:51:52 -04:00 committed by Alex Deucher
parent 5017bf8214
commit c010efb7f0
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -9191,7 +9191,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
/* restore the backlight level */
if (dm->backlight_dev)
if (dm->backlight_dev && (amdgpu_dm_backlight_get_level(dm) != dm->brightness[0]))
amdgpu_dm_backlight_set_level(dm, dm->brightness[0]);
#endif
/*