xhci: Regression fix for 3.13

Hi Greg,

In 3.12-rc5, I merged a patch that was supposed to fix spurious reboots on
shutdown on HP systems.  The quirk was broadly applied to all Intel Haswell and
Haswell ULT systems.  Turns out the quirk caused non-HP systems to reboot on
suspend.  They shutdown just fine with the quirk patch reverted.  This patch
narrows the xHCI quirk to only run on HP systems.

Sometimes fixing firmware issues feels like plugging holes in a leaky boat.

Sarah Sharp
xhci: Limit the spurious wakeup fix only to HP machines

We've got regression reports that my previous fix for spurious wakeups
after S5 on HP Haswell machines leads to the automatic reboot at
shutdown on some machines.  It turned out that the fix for one side
triggers another BIOS bug in other side.  So, it's exclusive.

Since the original S5 wakeups have been confirmed only on HP machines,
it'd be safer to apply it only to limited machines.  As a wild guess,
limiting to machines with HP PCI SSID should suffice.

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

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=66171
Cc: stable@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: <dashing.meng@gmail.com>
Reported-by: Niklas Schnelle <niklas@komani.de>
Reported-by: Giorgos <ganastasiouGR@gmail.com>
Reported-by: <art1@vhex.net>
1 file changed