DISPC_CONTROL
bus_space_write_4(sc->sc_iot, sc->sc_dcioh, DISPC_CONTROL,
bus_space_write_4(sc->sc_iot, sc->sc_dcioh, DISPC_CONTROL,
bus_space_read_4(sc->sc_iot, sc->sc_dcioh, DISPC_CONTROL) &
reg = bus_space_read_4(sc->sc_iot, sc->sc_dcioh, DISPC_CONTROL);