bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-03 05:52:38 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/amd/display: Fix AMDGPU_MAX_BL_LEVEL value

Browse Source 
[Why]
commit 16dc8bc27c ("drm/amd/display: Export full brightness range to
userspace") adjusted the brightness range to scale to larger values, but
missed updating AMDGPU_MAX_BL_LEVEL which is needed to make sure that
scaling works properly with custom brightness curves.

[How]
As the change for max brightness of 0xFFFF only applies to devices
supporting DC, use existing DC define MAX_BACKLIGHT_LEVEL.

Fixes: 16dc8bc27c ("drm/amd/display: Export full brightness range to userspace")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20250623171114.1156451-1-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello
2025-06-23 12:11:13 -05:00
committed by Alex Deucher
parent 518f13f8e3
commit 5b852044eb
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@@ -4752,16 +4752,16 @@ static int get_brightness_range(const struct amdgpu_dm_backlight_caps *caps,
return 1;
}
/* Rescale from [min..max] to [0..AMDGPU_MAX_BL_LEVEL] */
/* Rescale from [min..max] to [0..MAX_BACKLIGHT_LEVEL] */
static inline u32 scale_input_to_fw(int min, int max, u64 input)
{
return DIV_ROUND_CLOSEST_ULL(input * AMDGPU_MAX_BL_LEVEL, max - min);
return DIV_ROUND_CLOSEST_ULL(input * MAX_BACKLIGHT_LEVEL, max - min);
}
/* Rescale from [0..AMDGPU_MAX_BL_LEVEL] to [min..max] */
/* Rescale from [0..MAX_BACKLIGHT_LEVEL] to [min..max] */
static inline u32 scale_fw_to_input(int min, int max, u64 input)
{
return min + DIV_ROUND_CLOSEST_ULL(input * (max - min), AMDGPU_MAX_BL_LEVEL);
return min + DIV_ROUND_CLOSEST_ULL(input * (max - min), MAX_BACKLIGHT_LEVEL);
}
static void convert_custom_brightness(const struct amdgpu_dm_backlight_caps *caps,
@@ -4981,7 +4981,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector)
drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, max,
caps->ac_level, caps->dc_level);
} else
props.brightness = props.max_brightness = AMDGPU_MAX_BL_LEVEL;
props.brightness = props.max_brightness = MAX_BACKLIGHT_LEVEL;
if (caps->data_points && !(amdgpu_dc_debug_mask & DC_DISABLE_CUSTOM_BRIGHTNESS_CURVE))
drm_info(drm, "Using custom brightness curve\n");