xhci: Switch Intel Lynx Point ports to EHCI on shutdown.

The same issue like with Panther Point chipsets. If the USB ports are
switched to xHCI on shutdown, the xHCI host will send a spurious interrupt,
which will wake the system. Some BIOS have work around for this, but not all.
One example is Compulab's mini-desktop, the Intense-PC2.

The bug can be avoided if the USB ports are switched back to EHCI on
shutdown.

This patch should be backported to stable kernels as old as 3.12,
that contain the commit 0d0b9ee56d625705df7577664937ce4e2a7540b7
"xhci: Fix spurious wakeups after S5 on Haswell"

Signed-off-by: Denis Turischev <denis@compulab.co.il>
Cc: stable@vger.kernel.org
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 47390e369cd402f776c20bbb35b4c37223f04057..1715063630bdcd67fa921606f6fdcb678c19f6c5 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -134,6 +134,8 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
                 */
                if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP)
                        xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
+
+               xhci->quirks |= XHCI_SPURIOUS_REBOOT;
        }
        if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
                        pdev->device == PCI_DEVICE_ID_ASROCK_P67) {