CP_RB_WPTR_ADDR   488 drivers/gpu/drm/radeon/evergreend.h #define	CP_RB_WPTR_ADDR					0xC118
CP_RB_WPTR_ADDR   207 drivers/gpu/drm/radeon/r600d.h #define	CP_RB_WPTR_ADDR					0xC118
CP_RB_WPTR_ADDR   360 drivers/gpu/drm/radeon/rv770d.h #define	CP_RB_WPTR_ADDR					0xC118