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Observed random DMA timeout failures while doing back to back transfers which involves switching the modes from DMA to NON-DMA. This issue is observed while testing the OSPI+UBIFS file system test case where rootfs is mounted from OSPI UBIFS partition. To avoid this issue, disable the SPI before changing the configuration from external DMA to NON-DMA and vice versa and reenable it after changing the configuration. As per the Cadence Octal SPI design specification, it is recommended to disable the Octal-SPI enable bit before reconfiguring. Signed-off-by: Sai Krishna Potthuri <sai.krishna.potthuri@amd.com> Link: https://lore.kernel.org/r/20230320095931.2651714-3-sai.krishna.potthuri@amd.com Signed-off-by: Mark Brown <broonie@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.