Fix a suspend/resume issue. My Compaq N400c works fine.

sys/dev/usb/uhci.c

@@ -724,6 +724,9 @@ uhci_power(int why, void *v)
 #endif
 		sc->sc_bus.use_polling++;
 		sc->sc_suspend = why;
+		UWRITE2(sc, UHCI_INTR, 0);	/* disable interrupts */
+		uhci_globalreset(sc);		/* reset the controller */
+		uhci_reset(sc);
 		if (cmd & UHCI_CMD_RS)
 			uhci_run(sc, 0); /* in case BIOS has started it */
 

sys/dev/usb/uhci_pci.c

@@ -166,6 +166,8 @@ uhci_pci_resume(device_t self)
 {
 	uhci_softc_t *sc = device_get_softc(self);
 
+	pci_write_config(self, PCI_LEGSUP, PCI_LEGSUP_USBPIRQDEN, 2);
+
 	uhci_power(PWR_RESUME, sc);
 	bus_generic_resume(self);