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When we have multiple CPU DAIs in a dailink, typically for SoundWire aggregated solutions with amplifiers on multiple links, we only want to allocate one HDaudio stream_tag. The simplest solution is to allocate the hext_stream/stream_tag for the DAI with index 0 in the dailink, and reuse the same stream for all other CPU DAIs. This assumption relies on serialization of DAIs by the ASoC core, where all CPU DAIs are handled in a loop. The stream release follows the same idea of releasing the tag for the first DAI only. Ideally we would want the loop to be handled in reverse-order to summetry, but there is no risk of reusing a stream_tag which is no longer valid. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@intel.com> Link: https://lore.kernel.org/r/20230807210959.506849-13-pierre-louis.bossart@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.