Merge branch 'for-3.0' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound...

[pandora-kernel.git] / drivers / usb / host / xhci-pci.c

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index cbc4d49..c408e9f 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -118,6 +118,12 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
        /* AMD PLL quirk */
        if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
                xhci->quirks |= XHCI_AMD_PLL_FIX;
+       if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+                       pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
+               xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
+               xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
+               xhci->limit_active_eps = 64;
+       }
 
        /* Make sure the HC is halted. */
        retval = xhci_halt(xhci);
@@ -242,8 +248,28 @@ static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 {
        struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
+       struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
        int                     retval = 0;
 
+       /* The BIOS on systems with the Intel Panther Point chipset may or may
+        * not support xHCI natively.  That means that during system resume, it
+        * may switch the ports back to EHCI so that users can use their
+        * keyboard to select a kernel from GRUB after resume from hibernate.
+        *
+        * The BIOS is supposed to remember whether the OS had xHCI ports
+        * enabled before resume, and switch the ports back to xHCI when the
+        * BIOS/OS semaphore is written, but we all know we can't trust BIOS
+        * writers.
+        *
+        * Unconditionally switch the ports back to xHCI after a system resume.
+        * We can't tell whether the EHCI or xHCI controller will be resumed
+        * first, so we have to do the port switchover in both drivers.  Writing
+        * a '1' to the port switchover registers should have no effect if the
+        * port was already switched over.
+        */
+       if (usb_is_intel_switchable_xhci(pdev))
+               usb_enable_xhci_ports(pdev);
+
        retval = xhci_resume(xhci, hibernated);
        return retval;
 }