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3f74f1a0bd
commit a4a251f8c23518899d2078c320cf9ce2fa459c9f upstream.
On some systems rt2800usb and mt7601u devices are unable to operate since
commit f8f80be501aa ("xhci: Use soft retry to recover faster from
transaction errors")
Seems that some xHCI controllers can not perform Soft Retry correctly,
affecting those devices.
To avoid the problem add xhci->quirks flag that restore pre soft retry
xhci behaviour for affected xHCI controllers. Currently those are
AMD_PROMONTORYA_4 and AMD_PROMONTORYA_2, since it was confirmed
by the users: on those xHCI hosts issue happen and is gone after
disabling Soft Retry.
[minor commit message rewording for checkpatch -Mathias]
Fixes: f8f80be501aa ("xhci: Use soft retry to recover faster from transaction errors")
Cc: <stable@vger.kernel.org> # 4.20+
Reported-by: Bernhard <bernhard.gebetsberger@gmx.at>
Tested-by: Bernhard <bernhard.gebetsberger@gmx.at>
Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202541
Link: https://lore.kernel.org/r/20210311115353.2137560-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 2a28c0f457c5563cef9fbad803d9445eee0c1e05)
[Vegard: fix conflict in context due to missing commit
9b1f935ae4daefbc6ff8929526875d55b7a53121 ("usb: xhci: Workaround for S3
issue on AMD SNPS 3.0 xHC").]
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.