xhci: Switch Intel Lynx Point ports to EHCI on shutdown.
authorDenis Turischev <denis.turischev@compulab.co.il>
Fri, 25 Apr 2014 16:20:14 +0000 (19:20 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 25 Apr 2014 16:34:10 +0000 (09:34 -0700)
commitc09ec25d3684cad74d851c0f028a495999591279
treef99b2d634dc438bd1775ba40f73ea0229457f4e0
parent1f81b6d22a5980955b01e08cf27fb745dc9b686f
xhci: Switch Intel Lynx Point ports to EHCI on shutdown.

The same issue like with Panther Point chipsets. If the USB ports are
switched to xHCI on shutdown, the xHCI host will send a spurious interrupt,
which will wake the system. Some BIOS have work around for this, but not all.
One example is Compulab's mini-desktop, the Intense-PC2.

The bug can be avoided if the USB ports are switched back to EHCI on
shutdown.

This patch should be backported to stable kernels as old as 3.12,
that contain the commit 638298dc66ea36623dbc2757a24fc2c4ab41b016
"xhci: Fix spurious wakeups after S5 on Haswell"

Signed-off-by: Denis Turischev <denis@compulab.co.il>
Cc: stable@vger.kernel.org
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/host/xhci-pci.c