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[ Upstream commit f59f93cd1d720809466c7fd5aa16a236156c672b ] During disconnect USB-3 ports often go via SS.Inactive link error state before the missing terminations are noticed, and link finally goes to RxDetect state Avoid immediately warm-resetting ports in SS.Inactive state. Let ports settle for a while and re-read the link status a few times 20ms apart to see if the ports transitions out of SS.Inactive. According to USB 3.x spec 7.5.2, a port in SS.Inactive should automatically check for missing far-end receiver termination every 12 ms (SSInactiveQuietTimeout) The futile multiple warm reset retries of a disconnected device takes a lot of time, also the resetting of a removed devices has caused cases where the reset bit got stuck for a long time on xHCI roothub. This lead to issues in detecting new devices connected to the same port shortly after. Tested-by: Mark Pearson <markpearson@lenovo.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20211210111653.1378381-1-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Stable-dep-of: 2521106fc732 ("usb: hub: Don't try to recover devices lost during warm reset.") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.