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Each SoundWire peripheral can be programmed from the manager side either with a regular command FIFO, or with the HDaudio CORB/RIRB DMA-based mechanism. The mapping between SoundWire peripheral and SDI address is handled with the LSDIID register. This mapping only works of course if each peripheral has a unique address across all links. This has already been enforced in previous Intel contributions allowing for an IDA-based solution for the device number allocation. The checks on the dev_num are handled at the SoundWire level, but the locking is handled at the hda-mlink level. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@intel.com> Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20230404104127.5629-16-peter.ujfalusi@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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