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SoundWire w/ deep-buffer: race condition on trigger #3104
Description
when thesofproject/sof#4611 is used to enable a deep-buffer PCM, we see a race condition reported with sof-test, where the TRIGGER_START is sent twice and TRIGGER_STOP never. This leads to invalid SoundWire stream states.
Activity
plbossart commentedon Aug 17, 2021
#3098 provides a solution to remove the race condition, but it creates another issue with mixing: stopping one stream results in an xrun for the other....
to reproduce: use PR 3098
terminal 1: speaker-test -Dhw:0,0 -c2 -r48000
terminal2: speaker-test -Dhw:0,31 -c2 -r48000 -l1
a xrun happens when the second stream stops. Gah.
plbossart commentedon Oct 13, 2021
RFC v3 sent upstream https://lore.kernel.org/alsa-devel/20211013143050.244444-1-pierre-louis.bossart@linux.intel.com/ and WIP patches in PR #3209
plbossart commentedon Jun 8, 2022
fixed with upstream changes.