tree 7ea059fe9f19fe19b0e262aaf316eb147cee14a5
parent 243292a2ad3dc365849b820a64868927168894ac
author Zhuang Jin Can <jin.can.zhuang@intel.com> 1437488430 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1437599977 -0700

xhci: prevent bus_suspend if SS port resuming in phase 1

When the link is just waken, it's in Resume state, and driver sets PLS to
U0. This refers to Phase 1. Phase 2 refers to when the link has completed
the transition from Resume state to U0.

With the fix of xhci: report U3 when link is in resume state, it also
exposes an issue that usb3 roothub and controller can suspend right
after phase 1, and this causes a hard hang in controller.

To fix the issue, we need to prevent usb3 bus suspend if any port is
resuming in phase 1.

[merge separate USB2 and USB3 port resume checking to one -Mathias]
Cc: <stable@vger.kernel.org>
Signed-off-by: Zhuang Jin Can <jin.can.zhuang@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>