XHCI_IMAN
xhci_rt_write_4(sc, XHCI_IMAN(0), XHCI_IMAN_INTR_ENA);
iman = xhci_rt_read_4(sc, XHCI_IMAN(0));
xhci_rt_write_4(sc, XHCI_IMAN(0), iman);
iman = xhci_rt_read_4(sc, XHCI_IMAN(0));
xhci_rt_write_4(sc, XHCI_IMAN(0), 0);
sc->sc_regs.iman0 = xhci_rt_read_4(sc, XHCI_IMAN(0));
xhci_rt_write_4(sc, XHCI_IMAN(0), sc->sc_regs.iman0);