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

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[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>

...

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David Francis 2018-07-18 16:03:30 -04:00 • committed by Alex Deucher

parent 620a0d27b2

commit 53a53f8687

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

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