[coreboot-gerrit] Patch merged into coreboot/master: a6d6ddf lynxpoint: Fix an issue clearing port change status bits

the following patch was just integrated into master:
commit a6d6ddf7688258a3aa66ccbf2ea580ad750e9577
Author: Duncan Laurie 
Date:   Tue Aug 13 13:32:28 2013 -0700

lynxpoint: Fix an issue clearing port change status bits

The coreboot and ACPI code that clears USB3 PORTSC change status
    bits was not properly preserving the state of the PED (port enabled
    or disabled) status bit, and it could write 0 back to this field
    which would disable the port.

Additionally add back the code that resets disconnected USB3 ports
    on the way into suspend (as stated in the BWG) but take care to
    clear the PME status bit so we don't immediately wake.

suspend/resume with USB3 devices

1) suspend with no devices, plug in while suspended, then resume
    and verify that the devices are detected
    2) suspend with USB3 devices inserted, then suspend and resume
    and verify that the devices are detected
    3) suspend with USB3 devices inserted, then remove the devices
    while suspended, resume and ensure they can be detected again
    when inserted after resume

Change-Id: Ic7e8d375dfe645cf0dc1f041c3a3d09d0ead1a51
    Signed-off-by: Duncan Laurie 
    Reviewed-on: https://gerrit.chromium.org/gerrit/65733
    Reviewed-by: Aaron Durbin 
    Commit-Queue: Aaron Durbin

See http://review.coreboot.org/4473 for details.

-gerrit