ChangeSet 1.1608.24.4, 2004/02/26 14:08:39-08:00, [EMAIL PROTECTED]
[PATCH] USB: Enable interrupts in UHCI after PM resume
On Mon, 23 Feb 2004, Chip Salzenberg wrote:
> It works ... perfectly! I can now suspend and resume my A30 with
> impunity, and the USB keyboard works fine after each resume.
>
> Thanks much, Alan.
>
> (Now if I could just get the alsa guys to fix snd-intel8x0...)
This patch re-initializes the UHCI Interrupt Enable register following a
PM resume. Apparently some systems clear the register during suspend,
which causes obvious problems later on.
drivers/usb/host/uhci-hcd.c | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff -Nru a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
--- a/drivers/usb/host/uhci-hcd.c Tue Mar 16 15:06:59 2004
+++ b/drivers/usb/host/uhci-hcd.c Tue Mar 16 15:06:59 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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