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[BUG] Noisy DMIC recording with concurrent audio playback over speakers #9205

@syedk008

Description

@syedk008

Describe the bug
We observed Noisy DMIC recordings with concurrent playback over speakers on the ARL-S platform.
The issue happens only with 4-channel Dmic recording but not with 2-channels.
To Reproduce
start and stop DMIC recording and playback over speakers using arecord and aplay.

  1. start playback over speakers: aplay -Dhw:0,0 -c 2 -r 48000
  2. start DMIC recording: arecord -Dhw:0,6 -f s32_LE -c 4 -r 48000
  3. wait 10 sec and stop both playback and records
  4. playback recorded file to see if any noise.
    repeat the steps several times.
    you can use the attached script to reproduce the issue.

Reproduction Rate
~25%
Expected behavior
No noise in the recording.

Impact
critical

Environment

  1. kernel: branch: sof-dev and commit:4b0046880585
    sof: v2.9 mtl
  2. Name of the topology file
    • Topology: sof-hda-generic-ace1-4ch.tplg
  3. Name of the platform(s) on which the bug is observed.
    • Platform: ARL-S

concurrent_rec_play_.txt

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