Commit 53a53f86 authored Jul 18, 2018 by David Francis Committed by Alex Deucher Aug 06, 2018

drm/amd/display: Read back max backlight value at boot



[Why]
If there is no program explicitly setting the backlight
brightness (for example, during a minimal install of linux), the
hardware defaults to maximum brightness but the backlight_device
defaults to 0 value.  Thus, settings displays the wrong brightness
value.

[How]
When creating the backlight device, set brightness to max

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 620a0d27

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

+1 −0

Original line number	Diff line number	Diff line
		@@ -1340,6 +1340,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_display_manager *dm)
		struct backlight_properties props = { 0 };

		props.max_brightness = AMDGPU_MAX_BL_LEVEL;
		props.brightness = AMDGPU_MAX_BL_LEVEL;
		props.type = BACKLIGHT_RAW;

		snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d",

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