EHCI_IPOLLRATES
for (lev = EHCI_IPOLLRATES - 1; lev > 0; lev--)
sc->sc_islots[EHCI_IQHIDX(EHCI_IPOLLRATES - 1,
#define EHCI_INTRQHS ((1 << EHCI_IPOLLRATES) - 1)
#define EHCI_MAX_POLLRATE (1 << (EHCI_IPOLLRATES - 1))