diff options
| author | Anthony Koo <Anthony.Koo@amd.com> | 2019-08-29 10:49:12 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-10-03 09:10:57 -0500 |
| commit | 2ad0cdf9e2e9e079af34af681863fa638f2ee212 (patch) | |
| tree | 0798667d3915b9f27fac3fabc8b99e90853455ee /drivers/gpu/drm/amd/display/modules/power/power_helpers.h | |
| parent | 799c5b9cb91ca759df65707d2820b5fe1ee5383c (diff) | |
drm/amd/display: set minimum abm backlight level
[Why]
A lot of the time, the backlight characteristic curve maps min backlight
to a non-zero value.
But there are cases where we want the curve to intersect at 0.
In this scenario even if OS never asks to set 0% backlight, the ABM
reduction can result in backlight being lowered close to 0.
This particularly can cause problems in some LED drivers, and in
general just looks like backlight is completely off.
[How]
Add default cap to disallow backlight from dropping below 1%
even after ABM reduction is applied.
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules/power/power_helpers.h')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/power/power_helpers.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.h b/drivers/gpu/drm/amd/display/modules/power/power_helpers.h index da5df00fedce..e54157026330 100644 --- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.h +++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.h @@ -38,6 +38,7 @@ struct dmcu_iram_parameters { unsigned int backlight_lut_array_size; unsigned int backlight_ramping_reduction; unsigned int backlight_ramping_start; + unsigned int min_abm_backlight; unsigned int set; }; |