UVD_SEMA_CMD     1136 drivers/gpu/drm/radeon/nid.h #define UVD_SEMA_CMD					0xEF08
UVD_SEMA_CMD     1487 drivers/gpu/drm/radeon/r600d.h #define UVD_SEMA_CMD					0xef08
UVD_SEMA_CMD      995 drivers/gpu/drm/radeon/rv770d.h #define UVD_SEMA_CMD					0xef08