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Mathias Nyman d92f2c59cc xhci: Don't let USB3 ports stuck in polling state prevent suspend 
Commit 2f31a67f01 ("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: 2f31a67f01 ("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>
2019-03-22 17:16:05 +01:00
arch Kbuild updates for v5.1 (2nd) 2019-03-17 13:25:26 -07:00
block for-5.1/block-post-20190315 2019-03-16 12:36:39 -07:00
certs
crypto
Documentation Kbuild updates for v5.1 (2nd) 2019-03-17 13:25:26 -07:00
drivers xhci: Don't let USB3 ports stuck in polling state prevent suspend 2019-03-22 17:16:05 +01:00
fs Pull request for inlusion in 5.1 2019-03-17 09:10:56 -07:00
include Kbuild updates for v5.1 (2nd) 2019-03-17 13:25:26 -07:00
init
ipc
kernel pidfd patches for v5.1-rc1 2019-03-16 13:47:14 -07:00
lib Kbuild updates for v5.1 (2nd) 2019-03-17 13:25:26 -07:00
LICENSES
mm device-dax for 5.1 2019-03-16 13:05:32 -07:00
net Pull request for inlusion in 5.1 2019-03-17 09:10:56 -07:00
samples
scripts kconfig: remove stale lxdialog/.gitignore 2019-03-17 15:47:02 +09:00
security
sound sound fixes for 5.1-rc1 2019-03-15 14:05:00 -07:00
tools pidfd patches for v5.1-rc1 2019-03-16 13:47:14 -07:00
usr
virt ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
.clang-format
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MAINTAINERS ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
Makefile Linux 5.1-rc1 2019-03-17 14:22:26 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.