This is a note to let you know that I've just added the patch titled
usb: Prevent dead ports when xhci is not enabled
to the 3.4-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-prevent-dead-ports-when-xhci-is-not-enabled.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 58b2939b4d5a030eaec469d29812ab8477ee7e76 Mon Sep 17 00:00:00 2001
From: David Moore <[email protected]>
Date: Wed, 23 Jan 2013 22:19:49 -0800
Subject: usb: Prevent dead ports when xhci is not enabled
From: David Moore <[email protected]>
commit 58b2939b4d5a030eaec469d29812ab8477ee7e76 upstream.
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 <[email protected]>
Signed-off-by: Sarah Sharp <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/host/pci-quirks.c | 1 +
1 file changed, 1 insertion(+)
--- 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_de
"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;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/usb-prevent-dead-ports-when-xhci-is-not-enabled.patch
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