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On Intel platforms there is a strict order requirement for the DMA programming: DSP side configures the buffer and sets the GEN bit Host side sets the RUN bit. In order to follow this flow, a new global message type has been added to prepare the DSP side of the DMA: host sends LOAD_LIBRARY_PREPARE with the dma_id DSP side sets its buffer and sets the GEN bit Host sets the RUN bit Host sends LOAD_LIBRARY with dma_id and lib_id DSP receives the library data. It is up to the platform code to use the new prepare stage message and how to handle the reply to it from the firmware, which can indicate that the message type is not supported/handled. In this case the kernel should proceed to the LOAD_LIBRARY stage assuming a single stage library loading: host sends LOAD_LIBRARY_PREPARE with the dma_id DSP replies that the message type is not supported/handled Host acknowledges the return code and sets the RUN bit Host sends LOAD_LIBRARY with dma_id and lib_id DSP receives the library data. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Reviewed-by: Chao Song <chao.song@linux.intel.com> Link: https://lore.kernel.org/r/20230915114018.1701-4-peter.ujfalusi@linux.intel.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.