On Thu, 19 Feb 2004, Chip Salzenberg wrote:
> Still fails in 2.6.3. Logs, with debugging on, are included below.
>
> A clue: The failure is not caused by re-plugging per se. It's
> triggered by APM suspension. When I tested my system today with
> 2.6.3, it worked OK at first; then I got the idea to suspend and
> try again, and then it failed.
I think this may be the answer. Apparently on some systems the UHCI
controller's interrupts are disabled during power management
suspend/resume. This patch will re-enable interrupts. Let me know how it
works.
Alan Stern
--- 2.6/drivers/usb/host/uhci-hcd.c.orig Fri Feb 20 15:04:41 2004
+++ 2.6/drivers/usb/host/uhci-hcd.c Sun Feb 22 15:23:59 2004
@@ -2471,9 +2471,16 @@
pci_set_master(to_pci_dev(uhci_dev(uhci)));
- if (uhci->state == UHCI_SUSPENDED)
+ if (uhci->state == UHCI_SUSPENDED) {
+
+ /*
+ * Some systems clear the Interrupt Enable register during
+ * PM suspend/resume, so reinitialize it.
+ */
+ outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC |
+ USBINTR_SP, uhci->io_addr + USBINTR);
uhci->resume_detect = 1;
- else {
+ } else {
reset_hc(uhci);
start_hc(uhci);
}
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