[PATCH 0/2][SRU][B/F/OEM-B/OEM-OSP1-B/OEM-5.6] Fix System stops responding while entering S3 with SD card installed

[Hsuan-Yu Lin]

BugLink: https://bugs.launchpad.net/bugs/1880519

[Impact]
The system stops responding while entering S3, screen will be lit up
if touchpad is triggered by finger. Cursor could be seen with black background,
but system is not responding to any input.

[Fix]
Patchset[1] for fix this issue currently landed in upstream,
so we backported them:

[1]:
b3d71abd135e xhci: Poll for U0 after disabling USB2 LPM
f0c472a6da51 xhci: Return if xHCI doesn't support LPM

[Test]
With the above patch applied, run:
sudo fwts --s3-sleep-delay=30 --s3-multiple=30 -p s3

Can passed 30 times.

[Regression Potential]
Low, the patch is just like a safeguard,
doesn't really change any behavior.

Kai-Heng Feng (2):
  xhci: Return if xHCI doesn't support LPM
  xhci: Poll for U0 after disabling USB2 LPM

 drivers/usb/host/xhci.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

-- 
2.25.1