6.17-stable review patch. If anyone has any objections, please let me know.
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From: Mario Limonciello superm1@kernel.org
[ Upstream commit 68f3c044f37d9f50d67417fa8018d9cf16423458 ]
[Why] There is a `scale` sysfs attribute that can be used to indicate when non-linear brightness scaling is in use. As Custom brightness curves work by linear interpolation of points the scale is no longer linear.
[How] Indicate non-linear scaling when custom brightness curves in use and linear scaling otherwise.
Reviewed-by: Alex Hung alex.hung@amd.com Signed-off-by: Mario Limonciello superm1@kernel.org Signed-off-by: Wayne Lin wayne.lin@amd.com Tested-by: Dan Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index afe3a8279c3a9..8eb2fc4133487 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5032,8 +5032,11 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) } else props.brightness = props.max_brightness = MAX_BACKLIGHT_LEVEL;
- if (caps->data_points && !(amdgpu_dc_debug_mask & DC_DISABLE_CUSTOM_BRIGHTNESS_CURVE)) + if (caps->data_points && !(amdgpu_dc_debug_mask & DC_DISABLE_CUSTOM_BRIGHTNESS_CURVE)) { drm_info(drm, "Using custom brightness curve\n"); + props.scale = BACKLIGHT_SCALE_NON_LINEAR; + } else + props.scale = BACKLIGHT_SCALE_LINEAR; props.type = BACKLIGHT_RAW;
snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d",