Out of the blue an ALi engineer contacted me and offered a fix for
lockups in IBM i-series laptops (RH Bugzilla #50225). I would
really appreciate if someone ran it on their _regular_ ohci
to ensure that it does not break non-ALi silicon. Both 2.4 and 2.5
are the same (approximately), the patch is against 2.4.
-- Pete
--- linux-2.4.19/drivers/usb/usb-ohci.c 2002-08-02 17:39:45.000000000 -0700
+++ linux-2.4.19-p3/drivers/usb/usb-ohci.c 2002-10-22 10:29:03.000000000 -0700
@@ -12,6 +12,7 @@
*
* History:
*
+ * 2002/10/22 OHCI_USB_OPER for ALi lockup in IBM i1200 (ALEX <thchou@ali>)
* 2002/03/08 interrupt unlink fix (Matt Hughes), better cleanup on
* load failure (Matthew Frederickson)
* 2002/01/20 async unlink fixes: return -EINPROGRESS (per spec) and
@@ -2165,7 +2166,11 @@
/* Reset USB (needed by some controllers) */
writel (0, &ohci->regs->control);
-
+
+ /* Force a state change from USBRESET to USBOPERATIONAL for ALi */
+ (void) readl (&ohci->regs->control); /* PCI posting */
+ writel (ohci->hc_control = OHCI_USB_OPER, &ohci->regs->control);
+
/* HC Reset requires max 10 ms delay */
writel (OHCI_HCR, &ohci->regs->cmdstatus);
while ((readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
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