From 58b2939b4d5a030eaec469d29812ab8477ee7e76 Mon Sep 17 00:00:00 2001 From: David Moore 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 Signed-off-by: Sarah Sharp Cc: stable@vger.kernel.org --- drivers/usb/host/pci-quirks.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/usb/host') diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index a3b6d7104ae..4c338ec03a0 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; } -- cgit v1.2.3