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Some SoundWire hardware topologies rely on different amplifiers or capture devices connected on different links. These devices need to be 'aggregated', remain synchronized and be handled as a single logical device. In the IPC3 solution, the aggregation for amplifiers was handled by a firmware 'demux' component. In the IPC4 solution, the demux component is not needed, the gateway component can handle multiple ALH/DMA transfers at the same time. This change makes the topology slightly more complicated in that only one ALH DAI will be connected in the topology with the gateway. The other DAIs that are part of the 'aggregated' dailink are not shown in the DAPM graph as connected to the gateway, but they will however be activated thanks to a feature in soc-dapm.c where events are forwarded to all DAIs in the dailink (see soc_dapm_stream_event). The topology also sets the same stream name for all widgets, dais and dailinks, so a search for the stream name helps identify cases where SoundWire/ALH aggregation is needed. Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Link: https://lore.kernel.org/r/20220614092630.20144-1-yung-chuan.liao@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.