VGT_GS_PER_VS     539 drivers/gpu/drm/radeon/r600d.h #define	VGT_GS_PER_VS					0x88E8
VGT_GS_PER_VS     625 drivers/gpu/drm/radeon/rv770d.h #define	VGT_GS_PER_VS					0x88E8