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[ Upstream commit6ece49c569] Enabling the SPI CS35L41 audio codec driver for Steam Deck [1] revealed a problem with the current AMD SPI controller driver implementation, consisting of an unrecoverable system hang. The issue can be prevented if we ensure the max transfer size and the max message size do not exceed the FIFO buffer size. According to the implementation of the downstream driver, the AMD SPI controller is not able to handle more than 70 bytes per transfer, which corresponds to the size of the FIFO buffer. Hence, let's fix this by setting the SPI limits mentioned above. [1] https://lore.kernel.org/r/20220621213819.262537-1-cristian.ciocaltea@collabora.com Reported-by: Anastasios Vacharakis <vacharakis@o2mail.de> Fixes:bbb336f39e("spi: spi-amd: Add AMD SPI controller driver support") Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com> Link: https://lore.kernel.org/r/20220706100626.1234731-2-cristian.ciocaltea@collabora.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.