commit: 58b2939b4d5a030eaec469d29812ab8477ee7e76
From: David Moore <david.mo...@gmail.com>
Date: Wed, 23 Jan 2013 22:19:49 -0800
Subject: 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.mo...@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sh...@linux.intel.com>
Cc: stable@vger.kernel.org
---
drivers/usb/host/pci-quirks.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index a3b6d71..4c338ec 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;
}
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
