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authorMathias Nyman <mathias.nyman@linux.intel.com>2019-03-22 17:50:17 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-22 17:16:05 +0100
commitd92f2c59cc2cbca6bfb2cc54882b58ba76b15fd4 (patch)
tree7c62ebf2e77ed07313c7a7a583f2f0a727943733 /Documentation/livepatch
parent8867ea262196a6945c24a0fb739575af646ec0e9 (diff)
downloadlinux-d92f2c59cc2cbca6bfb2cc54882b58ba76b15fd4.tar.bz2
xhci: Don't let USB3 ports stuck in polling state prevent suspend
Commit 2f31a67f01a8 ("usb: xhci: Prevent bus suspend if a port connect change or polling state is detected") was intended to prevent ports that were still link training from being forced to U3 suspend state mid enumeration. This solved enumeration issues for devices with slow link training. Turns out some devices are stuck in the link training/polling state, and thus that patch will prevent suspend completely for these devices. This is seen with USB3 card readers in some MacBooks. Instead of preventing suspend, give some time to complete the link training. On successful training the port will end up as connected and enabled. If port instead is stuck in link training the bus suspend will continue suspending after 360ms (10 * 36ms) timeout (tPollingLFPSTimeout). Original patch was sent to stable, this one should go there as well Fixes: 2f31a67f01a8 ("usb: xhci: Prevent bus suspend if a port connect change or polling state is detected") Cc: stable@vger.kernel.org Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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