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drm/amd/display: Restore backlight brightness after system resume 

Laptops with AMD APU doesn't restore display backlight brightness after
system resume.

This issue started when DC was introduced.

Let's use BL_CORE_SUSPENDRESUME so the backlight core calls
update_status callback after system resume to restore the backlight
level.

Tested on Dell Inspiron 3180 (Stoney Ridge) and Dell Latitude 5495
(Raven Ridge).

Cc: <stable@vger.kernel.org>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
alistair/sunxi64-5.4-dsi
Kai-Heng Feng 2019-09-02 16:33:42 +08:00 committed by Alex Deucher
parent e42a34dec6
commit bb264220d9
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -2113,6 +2113,7 @@ static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd)
}
static const struct backlight_ops amdgpu_dm_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = amdgpu_dm_backlight_get_brightness,
.update_status = amdgpu_dm_backlight_update_status,
};