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usb: pci-quirks: Prevent Sony VAIO t-series from switching usb ports

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Sony VAIO t-series machines are not capable of switching usb2 ports over
from Intel EHCI to xHCI controller. If tried the USB2 port will be left
unconnected and unusable.

This patch should be backported to stable kernels as old as 3.12,
that contain the commit 26b76798e0
"Intel xhci: refactor EHCI/xHCI port switching"

Cc: stable <stable@vger.kernel.org> # 3.12
Reported-by: Jorge <xxopxe@gmail.com>
Tested-by: Jorge <xxopxe@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2014-05-28 23:18:35 +03:00 committed by Greg Kroah-Hartman
parent 7ac3764fca
commit b38f09ccc3
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/host/pci-quirks.c
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@ -847,6 +847,13 @@ void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev)
bool ehci_found = false;
struct pci_dev *companion = NULL;
/* Sony VAIO t-series with subsystem device ID 90a8 is not capable of
* switching ports from EHCI to xHCI
*/
if (xhci_pdev->subsystem_vendor == PCI_VENDOR_ID_SONY &&
xhci_pdev->subsystem_device == 0x90a8)
return;
/* make sure an intel EHCI controller exists */
for_each_pci_dev(companion) {
if (companion->class == PCI_CLASS_SERIAL_USB_EHCI &&