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drm/amd/display: update bios scratch when setting backlight

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Update the bios scratch register when updating the backlight
level.  Some platforms apparently read this scratch register
and do additional operations in their hotkey handlers.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1518
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2021-11-23 10:44:48 -05:00
parent d5c7255dc7
commit 692cd92e66
3 changed files with 18 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -51,6 +51,7 @@
#include <drm/drm_hdcp.h>
#endif
#include "amdgpu_pm.h"
#include "amdgpu_atombios.h"
#include "amd_shared.h"
#include "amdgpu_dm_irq.h"
@@ -3925,6 +3926,9 @@ static int amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
caps = dm->backlight_caps[bl_idx];
dm->brightness[bl_idx] = user_brightness;
/* update scratch register */
if (bl_idx == 0)
amdgpu_atombios_scratch_regs_set_backlight_level(dm->adev, dm->brightness[bl_idx]);
brightness = convert_brightness_from_user(&caps, dm->brightness[bl_idx]);
link = (struct dc_link *)dm->backlight_link[bl_idx];