VGT_GS_PER_VS    2333 drivers/gpu/drm/radeon/r600.c 	WREG32(VGT_GS_PER_VS, 2);
VGT_GS_PER_VS    1568 drivers/gpu/drm/radeon/rv770.c 	WREG32(VGT_GS_PER_VS, 2);