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xHCI bug fix for broken BIOS on some Intel systems. 

Happy Valentine's Day!  Your present is a working xHCI driver under some
 Intel systems with buggy BIOSes that don't provide a legacy PCI IRQ line
 for the USB 3.0 host.
 
 Please queue for 3.3 and stable to share the love!
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Merge tag 'for-usb-linus-2012-02-14' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci into usb-linus

xHCI bug fix for broken BIOS on some Intel systems.

Happy Valentine's Day!  Your present is a working xHCI driver under some
Intel systems with buggy BIOSes that don't provide a legacy PCI IRQ line
for the USB 3.0 host.

Please queue for 3.3 and stable to share the love!
This commit is contained in:
Greg Kroah-Hartman 2012-02-14 14:48:15 -08:00
parent b7bc5925a9 68d07f64b8
commit 887aa58e48
3 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/usb/core/hcd-pci.c
View File

@ -187,7 +187,10 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
return -ENODEV;
dev->current_state = PCI_D0;
if (!dev->irq) {
/* The xHCI driver supports MSI and MSI-X,
* so don't fail if the BIOS doesn't provide a legacy IRQ.
*/
if (!dev->irq && (driver->flags & HCD_MASK) != HCD_USB3) {
dev_err(&dev->dev,
"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
pci_name(dev));

6
drivers/usb/core/hcd.c
View File

@ -2447,8 +2447,10 @@ int usb_add_hcd(struct usb_hcd *hcd,
&& device_can_wakeup(&hcd->self.root_hub->dev))
dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
/* enable irqs just before we start the controller */
if (usb_hcd_is_primary_hcd(hcd)) {
/* enable irqs just before we start the controller,
* if the BIOS provides legacy PCI irqs.
*/
if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
if (retval)
goto err_request_irq;

5
drivers/usb/host/xhci.c
View File

@ -352,6 +352,11 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
/* hcd->irq is -1, we have MSI */
return 0;
if (!pdev->irq) {
xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
return -EINVAL;
}
/* fall back to legacy interrupt*/
ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
hcd->irq_descr, hcd);