Commit 887aa58e authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

Merge tag 'for-usb-linus-2012-02-14' of... 

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!
parents b7bc5925 68d07f64

drivers/usb/core/hcd-pci.c

+4 −1
Original line number Diff line number Diff line
@@ -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));

drivers/usb/core/hcd.c

+4 −2
Original line number Diff line number Diff line
@@ -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;

drivers/usb/host/xhci.c

+5 −0
Original line number Diff line number Diff line
@@ -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);

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