IICPRI
mtx_sleep(_sc, &_sc->mtx, IICPRI, "glxiic", 0)
error = mtx_sleep(sc, &sc->lock, IICPRI|PCATCH, "iicreq", 0);
error = mtx_sleep(sc, &sc->lock, IICPRI, "iicreq", 0);