FEATURE_GFX_ULV_BIT
#define FEATURE_GFX_ULV_MASK (1 << FEATURE_GFX_ULV_BIT )
smu_feature_list_set_bit(smu, SMU_FEATURE_LIST_ALLOWED, FEATURE_GFX_ULV_BIT);
smu_feature_list_set_bit(smu, SMU_FEATURE_LIST_ALLOWED, FEATURE_GFX_ULV_BIT);
smu_feature_list_clear_bit(smu, SMU_FEATURE_LIST_ALLOWED, FEATURE_GFX_ULV_BIT);
smu_feature_list_set_bit(smu, SMU_FEATURE_LIST_ALLOWED, FEATURE_GFX_ULV_BIT);