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ac5bdfdc0e
All currently known ECs in the wild are very sensitive to timing. Specifically the ECs are known to drop a transfer if more than 8 ms passes from the assertion of the chip select until the transfer finishes. Let's use the new feature introduced in the patch (spi: Allow SPI devices to request the pumping thread be realtime") to request the SPI pumping thread be realtime. This means that if we get shunted off to the SPI thread for whatever reason we won't get downgraded to low priority. NOTES: - We still need to keep ourselves as high priority since the SPI core doesn't guarantee that all transfers end up on the pumping thread (in fact, it tries pretty hard to do them in the calling context). - If future Chrome OS ECs ever fix themselves to be less sensitive then we could consider adding a property (or compatible string) to not set this property. For now we need it across the board. Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Guenter Roeck <groeck@chromium.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> |
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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.