mps_wait_command
error = mps_wait_command(sc, cm, 0);
status = mps_wait_command(sc, cm, 30);
status = mps_wait_command(sc, cm, 30);
err = mps_wait_command(sc, cm, 60);
err = mps_wait_command(sc, cm, 30);
err = mps_wait_command(sc, cm, 30);
int mps_wait_command(struct mps_softc *sc, struct mps_command *cm, int timeout);