PERSP_GRADIENT_ENA 1034 drivers/gpu/drm/radeon/evergreend.h #define		PERSP_GRADIENT_ENA				(1<<28)
PERSP_GRADIENT_ENA  459 drivers/gpu/drm/radeon/r600d.h #define		PERSP_GRADIENT_ENA				(1<<28)
PERSP_GRADIENT_ENA  538 drivers/gpu/drm/radeon/rv770d.h #define		PERSP_GRADIENT_ENA				(1<<28)