CP_RB_WPTR        487 drivers/gpu/drm/radeon/evergreend.h #define	CP_RB_WPTR					0xC114
CP_RB_WPTR        206 drivers/gpu/drm/radeon/r600d.h #define	CP_RB_WPTR					0xC114
CP_RB_WPTR        359 drivers/gpu/drm/radeon/rv770d.h #define	CP_RB_WPTR					0xC114
CP_RB_WPTR        313 include/video/radeon.h #define CP_RB_WPTR                             0x0714