XHCI_TRB_3_CYCLE_BIT
k = (le32toh(trb->trb_3) & XHCI_TRB_3_CYCLE_BIT) ? 1 : 0;
control &= ~XHCI_TRB_3_CYCLE_BIT;
control |= XHCI_TRB_3_CYCLE_BIT;
control |= XHCI_TRB_3_CYCLE_BIT;
control &= ~XHCI_TRB_3_CYCLE_BIT;
xr->xr_trb[firstep].trb_3 |= htole32(XHCI_TRB_3_CYCLE_BIT);
xr->xr_trb[firstep].trb_3 &= ~htole32(XHCI_TRB_3_CYCLE_BIT);