XHCI_ERDP
xhci_rt_write_8(sc, XHCI_ERDP(0), xhci_ring_trbp(sc->sc_er, 0) |
xhci_rt_write_8(sc, XHCI_ERDP(0), xhci_ring_trbp(er, er->xr_ep) |
xhci_rt_write_8(sc, XHCI_ERDP(0), 0 | XHCI_ERDP_BUSY);
sc->sc_regs.erdp0 = xhci_rt_read_8(sc, XHCI_ERDP(0));
xhci_rt_write_8(sc, XHCI_ERDP(0), sc->sc_regs.erdp0);