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[CML][PM] White noise when being runtime suspended after playback #603

@xun2z

Description

@xun2z

Summary:
when playback using alc5682 codec on cometlake, there is a about 2s white noise when entering runtime suspend.

Test steps:

  1. Play some music, eg.
    aplay -vv -Dhw:0,0 -c2 -d2 48California_Dreaming.wav
  2. when it ends, check the runtime status
    cat /sys/bus/pci/devices/0000:00:1f.3/power/runtime_status
    The noise occurs when entering runtime suspended.
    However, this noise only happens in suspending and if we trigger new playback, there will be no noise during playback.

Test env:
sof cml-001-drop-stable: 1f5a965
kernel topic/cros-sof-v4.19: f69d618
tplg: sof-cnl-rt5682.tplg

noise file: noise.zip

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CMLApplies to Comet Lake platformP1Blocker bugs or important featuresbugSomething isn't working

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