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 | 18 |
1 files changed, 10 insertions, 8 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 67b547c64a3e..7505a33e00e1 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1573,21 +1573,23 @@ static int amdgpu_dm_backlight_update_status(struct backlight_device *bd) { struct amdgpu_display_manager *dm = bl_get_data(bd); + /* backlight_pwm_u16_16 parameter is in unsigned 32 bit, 16 bit integer + * and 16 bit fractional, where 1.0 is max backlight value. + * bd->props.brightness is 8 bit format and needs to be converted by + * scaling via copy lower byte to upper byte of 16 bit value. + */ + uint32_t brightness = bd->props.brightness * 0x101; + /* * PWM interperts 0 as 100% rather than 0% because of HW - * limitation for level 0.So limiting minimum brightness level + * limitation for level 0. So limiting minimum brightness level * to 1. */ if (bd->props.brightness < 1) - return 1; + brightness = 0x101; - /* backlight_pwm_u16_16 parameter is in unsigned 32 bit, 16 bit integer - * and 16 bit fractional, where 1.0 is max backlight value. - * bd->props.brightness is 8 bit format and needs to be converted by - * scaling via copy lower byte to upper byte of 16 bit value. - */ if (dc_link_set_backlight_level(dm->backlight_link, - (bd->props.brightness * 0x101), 0, 0)) + brightness, 0, 0)) return 0; else return 1; |