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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2012-06-22 09:51:03 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-16 08:47:50 -0700
commit671e3aaf0ce971311ab8405bf2acc295ce999529 (patch)
tree3a61b0730e26949425f6f9cf4d4eba3af0e56cf0 /drivers/usb
parent8cac2a0c0fc42e283e17352bebe1e662fa89c13b (diff)
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xhci: Avoid dead ports when CONFIG_USB_XHCI_HCD=n
Commit 51c9e6c7732b67769c0a514d31f505e49fa82dd4 upstream, but modified to get this to apply on 3.0. If the user chooses to say "no" to CONFIG_USB_XHCI_HCD on a system with an Intel Panther Point chipset, the PCI quirks code or the EHCI driver will switch the ports over to the xHCI host, but the xHCI driver will never load. The ports will be powered off and seem "dead" to the user. Fix this by only switching the ports over if CONFIG_USB_XHCI_HCD is either compiled in, or compiled as a module. This patch should be backported to the 3.0 stable kernel, since it contains the commit 69e848c2090aebba5698a1620604c7dccb448684 "Intel xhci: Support EHCI/xHCI port switching." Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Reported-by: Eric Anholt <eric.anholt@intel.com> Reported-by: David Bein <d.bein@f5.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/pci-quirks.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 0757b1934da..9ab094c0cf3 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -755,6 +755,7 @@ EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci);
*/
void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
{
+#if defined(CONFIG_USB_XHCI_HCD) || defined(CONFIG_USB_XHCI_HCD_MODULE)
u32 ports_available;
ports_available = 0xffffffff;
@@ -782,6 +783,18 @@ void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
&ports_available);
dev_dbg(&xhci_pdev->dev, "USB 2.0 ports that are now switched over "
"to xHCI: 0x%x\n", ports_available);
+#else
+ /* Don't switchover the ports if the user hasn't compiled the xHCI
+ * driver. Otherwise they will see "dead" USB ports that don't power
+ * the devices.
+ */
+ dev_warn(&xhci_pdev->dev,
+ "CONFIG_USB_XHCI_HCD is turned off, "
+ "defaulting to EHCI.\n");
+ dev_warn(&xhci_pdev->dev,
+ "USB 3.0 devices will work at USB 2.0 speeds.\n");
+#endif /* CONFIG_USB_XHCI_HCD || CONFIG_USB_XHCI_HCD_MODULE */
+
}
EXPORT_SYMBOL_GPL(usb_enable_xhci_ports);