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From 064e819e738f9f9fd1487d5e6d319f36fa1c27f5 Mon Sep 17 00:00:00 2001
From: David Francis <David.Francis@amd.com>
Date: Wed, 18 Jul 2018 16:03:30 -0400
Subject: [PATCH 5043/5725] 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>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 1c8088e..0d6475b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1457,6 +1457,7 @@ 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",
--
2.7.4
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