Commit 68f3c044 authored by Mario Limonciello's avatar Mario Limonciello Committed by Alex Deucher
Browse files

drm/amd/display: Indicate when custom brightness curves are in use 



[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: default avatarAlex Hung <alex.hung@amd.com>
Signed-off-by: default avatarMario Limonciello <superm1@kernel.org>
Signed-off-by: default avatarWayne Lin <wayne.lin@amd.com>
Tested-by: default avatarDan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 895b6139

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

+4 −1
Original line number Diff line number Diff line
@@ -5060,8 +5060,11 @@ 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",