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authorDavid Moore <david.moore@gmail.com>2013-01-23 22:19:49 -0800
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2013-01-24 09:56:19 -0800
commit58b2939b4d5a030eaec469d29812ab8477ee7e76 (patch)
tree9067f1fad90076e010f9ade5b36f43ffaa449364 /drivers/usb
parent48c3375c5f69b1c2ef3d1051a0009cb9bce0ce24 (diff)
usb: Prevent dead ports when xhci is not enabled
When the xHCI driver is not available, actively switch the ports to EHCI mode since some BIOSes leave them in xHCI mode where they would otherwise appear dead. This was discovered on a Dell Optiplex 7010, but it's possible other systems could be affected. This should be backported to kernels as old as 3.0, that contain the commit 69e848c2090aebba5698a1620604c7dccb448684 "Intel xhci: Support EHCI/xHCI port switching." Signed-off-by: David Moore <david.moore@gmail.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/pci-quirks.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index a3b6d7104ae2..4c338ec03a07 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -780,6 +780,7 @@ void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
"defaulting to EHCI.\n");
dev_warn(&xhci_pdev->dev,
"USB 3.0 devices will work at USB 2.0 speeds.\n");
+ usb_disable_xhci_ports(xhci_pdev);
return;
}