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https://github.com/torvalds/linux
23 October 2021, 00:29:24 UTC
Revision d5b4885b1dff72ac670b518cfeaac719d768bd4d authored by Jerome Brunet on 26 April 2018, 10:50:46 UTC, committed by Kevin Hilman on 27 June 2018, 23:48:25 UTC 
ARM64: dts: meson: disable sd-uhs modes on the libretech-cc
 
There is a problem with the sd-uhs mode when doing a soft reboot.
Switching back from 1.8v to 3.3v messes with the card, which no longer
respond (timeout errors). According to the specification, we should
perform a card reset (power cycling the card) but this is something we
cannot control on this design.

Then the only solution to restore the communication with the card is an
"unplug-plug" which is not acceptable

Until we find a solution, if any, disable the sd-uhs modes on this design.
For the people using uhs at the moment, there will a performance drop as
a result.

Fixes: 3cde63ebc85c ("ARM64: dts: meson-gxl: libretech-cc: enable high speed modes")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Cc: stable@vger.kernel.org
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
1 parent ce397d2
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Tip revision: d5b4885b1dff72ac670b518cfeaac719d768bd4d authored by Jerome Brunet on 26 April 2018, 10:50:46 UTC
ARM64: dts: meson: disable sd-uhs modes on the libretech-cc
Tip revision: d5b4885
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.
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.
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