skylake: Fix unwanted disablement of ACPI UPWE

In PORTSC, Port Enabled/Disabled(PED) is RW1CS.

When there is a USB device attached on system, current UPWE method
will set 1 to PED, this will cause port disabled as it's RW1CS.

This change is inspired by xhci_port_state_to_neutral in linux driver.
It will mask all RO and RWS bits and set WDE and WCE.

BUG=b:70777816
TEST=System won't be awakend from s3 automatically when usb devices
     is attached. Also system can be awakend by hotplugging usb
     devices under S3.

Change-Id: Ifd4c2d6640fea538e0ac71d7c5e73ab529e94f42
Signed-off-by: Kane Chen <kane.chen@intel.com>
Reviewed-on: https://review.coreboot.org/23848
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

0 files changed, 0 insertions, 0 deletions