From: Zhuang Jin Can <jin.can.zhuang@intel.com>
Date: Tue, 21 Jul 2015 14:20:30 +0000 (+0300)
Subject: xhci: prevent bus_suspend if SS port resuming in phase 1
X-Git-Tag: omap-for-v4.3/fixes-merge-window~184^2~8
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fac4271d1126c45ceaceb7f4a336317b771eb121;p=pandora-kernel.git

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>
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