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>
1 file changed
