diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 |
1 files changed, 6 insertions, 1 deletions
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 96118a0e1ffeb..09d95ee9283f0 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4834,6 +4834,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) struct backlight_properties props = { 0 }; struct amdgpu_dm_backlight_caps caps = { 0 }; char bl_name[16]; + int min, max; if (aconnector->bl_idx == -1) return; @@ -4846,11 +4847,15 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) } amdgpu_acpi_get_backlight_caps(&caps); - if (caps.caps_valid) { + if (caps.caps_valid && get_brightness_range(&caps, &min, &max)) { if (power_supply_is_system_supplied() > 0) props.brightness = caps.ac_level; else props.brightness = caps.dc_level; + /* min is zero, so max needs to be adjusted */ + props.max_brightness = max - min; + 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 = AMDGPU_MAX_BL_LEVEL; |