commit ba94a68d273fa82015fb56d4c9410047cf59c21b
Author: Kevin O'Connor <kevin@koconnor.net>
Date:   Sun Feb 14 19:05:35 2010 -0500

    Don't leave USB UHCI ports disabled for extended time during reset.
    
    Disabling the port will cause device to go into suspend - so don't do
    that during the reset sequence.

diff --git a/src/usb-uhci.c b/src/usb-uhci.c
index b7ff394..c3ff744 100644
--- a/src/usb-uhci.c
+++ b/src/usb-uhci.c
@@ -94,6 +94,7 @@ start_uhci(struct usb_s *cntl)
 static int
 check_ports(struct usb_s *cntl)
 {
+    // XXX - if just powered up, need to wait for USB_TIME_SIGATT?
     u16 port1 = inw(cntl->uhci.iobase + USBPORTSC1);
     u16 port2 = inw(cntl->uhci.iobase + USBPORTSC2);
 
@@ -101,29 +102,34 @@ check_ports(struct usb_s *cntl)
         // No devices
         return 0;
 
+    // XXX - if just powered up, need to wait for USB_TIME_ATTDB?
+
     // reset ports
     if (port1 & USBPORTSC_CCS)
         outw(USBPORTSC_PR, cntl->uhci.iobase + USBPORTSC1);
     if (port2 & USBPORTSC_CCS)
         outw(USBPORTSC_PR, cntl->uhci.iobase + USBPORTSC2);
     msleep(USB_TIME_DRSTR);
-    outw(0, cntl->uhci.iobase + USBPORTSC1);
-    outw(0, cntl->uhci.iobase + USBPORTSC2);
-    msleep(USB_TIME_RSTRCY);
 
     // Configure ports
     int totalcount = 0;
+    outw(0, cntl->uhci.iobase + USBPORTSC1);
+    udelay(6); // 64 high-speed bit times
     port1 = inw(cntl->uhci.iobase + USBPORTSC1);
     if (port1 & USBPORTSC_CCS) {
         outw(USBPORTSC_PE, cntl->uhci.iobase + USBPORTSC1);
+        msleep(USB_TIME_RSTRCY);
         int count = configure_usb_device(cntl, !!(port1 & USBPORTSC_LSDA));
         if (! count)
             outw(0, cntl->uhci.iobase + USBPORTSC1);
         totalcount += count;
     }
+    outw(0, cntl->uhci.iobase + USBPORTSC2);
+    udelay(6);
     port2 = inw(cntl->uhci.iobase + USBPORTSC2);
     if (port2 & USBPORTSC_CCS) {
         outw(USBPORTSC_PE, cntl->uhci.iobase + USBPORTSC2);
+        msleep(USB_TIME_RSTRCY);
         int count = configure_usb_device(cntl, !!(port2 & USBPORTSC_LSDA));
         if (! count)
             outw(0, cntl->uhci.iobase + USBPORTSC2);