tree edffa7386b8464ffe81761f02878419f472059cd
parent 525f359c0b6b95b260add2b4617fd86119d69397
author Todd Broch <tbroch@chromium.org> 1423271633 -0800
committer ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> 1423294460 +0000

broadwell: Clear USB3.0 PORTSC status bits in sleep_prepare.

Found that any non-USB3.0 devices connected to type-C ports
(displayPort dongles) cause XHCI port to see connection which in turn
leads us to enter USB compliance mode.

That in turn causes the port to wake the system for a yet-to-be
determined reason.  Clearing the PORTSC status bits (actually just
CSC) seems to remedy the wake.

Signed-off-by: Todd Broch <tbroch@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:35320
TEST=manual,

1. Plug hoho into type-C port on samus and remove
2. powerd_dbus_suspend

Device stays asleep.

Change-Id: I1396b9f8013dbbb31286c1d8958af592b3da7475
Reviewed-on: https://chromium-review.googlesource.com/247410
Commit-Queue: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>