[PATCH 3.13.y-ckt 027/121] xhci: Switch only Intel Lynx Point-LP ports to EHCI on shutdown.

From: Kamal Mostafa
Date: Tue Dec 02 2014 - 14:27:40 EST

3.13.11-ckt12 -stable review patch. If anyone has any objections, please let me know.


From: Denis Turischev <denis.turischev@xxxxxxxxxxxxxx>

commit 0a939993bff117d3657108ca13b011fc0378aedb upstream.

Patch "xhci: Switch Intel Lynx Point ports to EHCI on shutdown."
commit c09ec25d3684cad74d851c0f028a495999591279 is not fully correct

It switches both Lynx Point and Lynx Point-LP ports to EHCI on shutdown.
On some Lynx Point machines it causes spurious interrupt,
which wake the system: bugzilla.kernel.org/show_bug.cgi?id=76291

On Lynx Point-LP on the contrary switching ports to EHCI seems to be
necessary to fix these spurious interrupts.

Signed-off-by: Denis Turischev <denis@xxxxxxxxxxxxxx>
Reported-by: Wulf Richartz <wulf.richartz@xxxxxxxxx>
Cc: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
drivers/usb/host/xhci-pci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 3fc8d9e..21223f8 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -138,7 +138,9 @@ 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;
+ }
+ if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
xhci->quirks |= XHCI_SPURIOUS_REBOOT;
if (pdev->vendor == PCI_VENDOR_ID_ETRON &&

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