This is a note to let you know that I've just added the patch titled
usb: pci-quirks: Prevent Sony VAIO t-series from switching usb ports
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-pci-quirks-prevent-sony-vaio-t-series-from-switching-usb-ports.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b38f09ccc3fd453180e96273bf3f34083c30809a Mon Sep 17 00:00:00 2001
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Date: Wed, 28 May 2014 23:18:35 +0300
Subject: usb: pci-quirks: Prevent Sony VAIO t-series from switching usb ports
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
commit b38f09ccc3fd453180e96273bf3f34083c30809a upstream.
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 26b76798e0507429506b93cd49f8c4cfdab06896
"Intel xhci: refactor EHCI/xHCI port switching"
Reported-by: Jorge <xxopxe@xxxxxxxxx>
Tested-by: Jorge <xxopxe@xxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/pci-quirks.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -847,6 +847,13 @@ void usb_enable_intel_xhci_ports(struct
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 &&
Patches currently in stable-queue which might be from mathias.nyman@xxxxxxxxxxxxxxx are
queue-3.14/usb-pci-quirks-prevent-sony-vaio-t-series-from-switching-usb-ports.patch
queue-3.14/xhci-delete-endpoints-from-bandwidth-list-before-freeing-whole-device.patch
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