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xhci: clear root port wake on bits if controller isn't wake-up capable

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When xHCI PCI host is suspended, if do_wakeup is false in xhci_pci_suspend,
xhci_bus_suspend needs to clear all root port wake on bits. Otherwise some Intel
platforms may get a spurious wakeup, even if PCI PME# is disabled.

This patch should be back-ported to kernels as old as 2.6.37, that
contains the commit 9777e3ce90
"USB: xHCI: bus power management implementation".

Cc: stable@vger.kernel.org # 2.6.37
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lu Baolu 2014-06-24 17:14:43 +03:00 committed by Greg Kroah-Hartman
parent 3213b15138
commit ff8cbf250b
1 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/usb/host/xhci-hub.c
View file

@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/device.h>
#include <asm/unaligned.h>
#include "xhci.h"
@ -1139,7 +1140,9 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
* including the USB 3.0 roothub, but only if CONFIG_PM_RUNTIME
* is enabled, so also enable remote wake here.
*/
if (hcd->self.root_hub->do_remote_wakeup) {
if (hcd->self.root_hub->do_remote_wakeup
&& device_may_wakeup(hcd->self.controller)) {
if (t1 & PORT_CONNECT) {
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
t2 &= ~PORT_WKCONN_E;