EHCI_PS_PR
if (v & EHCI_PS_PR) i |= UPS_RESET;
EOWRITE4(sc, port, v | EHCI_PS_PR);
v &= ~ (EHCI_PS_PE | EHCI_PS_PR);
EOWRITE4(sc, port, v | EHCI_PS_PR);
EOWRITE4(sc, port, v & ~EHCI_PS_PR);
if (v & EHCI_PS_PR) {