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Subject[PATCH 4.18 129/197] drm/amd/display: Read back max backlight value at boot
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Francis <David.Francis@amd.com>

[ Upstream commit 53a53f8687faf492df2644d8c18ff0217fc18730 ]

[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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1334,6 +1334,7 @@ amdgpu_dm_register_backlight_device(stru
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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