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The ChainDMA operation differs from normal pipelines that it is only created when the stream started, in fact a PCM using ChainDMA has no pipelines, modules. To reset a ChainDMA, it needs to be first allocated in firmware. When PulseAudio/PipeWire starts, they will probe the PCMs by opening them, check hw_params and then close the PCM without starting audio. Unconditionally resetting the ChainDMA can result the following error: ipc tx : 0xe040000|0x0: GLB_CHAIN_DMA ipc tx reply: 0x2e000007|0x0: GLB_CHAIN_DMA FW reported error: 7 - Unsupported operation requested ipc error for msg 0xe040000|0x0 sof_pcm_stream_free: pcm_ops hw_free failed -22 Add a new chain_dma_allocated flag to sof_ipc4_pcm_stream_priv to store the ChainDMA allocation state and use this flag to skip sending the reset if the ChainDMA is not allocated. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@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://msgid.link/r/20240409110036.9411-5-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 reStructuredText 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.