[SDW][BUG]Pop noise occurred when switch to background/foreground during aplay0,2(RT1308) or aplay0,0(RT711)

[YvonneYang2]

Describe the bug
Pop noise occurred when terminate aplay0,2(RT1308) or aplay0,0(RT711) via "Ctrl-C".

To Reproduce

1. Boot up.
2. Aplay 0,2 via "aplay -Dhw:0,2 -r48000 -c2 -fs16_le wav/48California_Dreaming.wav -vv -i"
3. Switch to background via "Ctrl+z" and switch to foreground via "fg". If issue not reproduced, please try step2/3 more times.

frequency
Not each time occurred pop noise. Do step2/3 10 times, could reproduce about 5 times.

Expected result
There's no pop noise when switch background or foreground.

Actual result
Pop noise occurred when switch to background/foreground during aplay0,2(RT1308) or aplay0,0(RT711)

Environment
Kernel:release/sdw_cml_hotfix, commit:38d0dcd
FW: commits/cml-010-hot-fix, commit: 0ed0dba
tplg: Same with FW branch, sof-cml-rt711-rt1308-mono-rt715.tplg
platform: CML-U Laptop with ALC711+ ALC1308+ ALC715 in SDW mode
ucm: https://github.com/thesofproject/alsa-ucm-conf.git+PR#24 or PR#28

bg_demsg.log
bg_soflogger.log

[YvonneYang2]

Tested with nocodec tplg, please see the picture and attached wave.

sine_fg.zip

[sinahuang]

Issue also can be reproduced on CML-H Laptop with codec ALC711, 2 x RT1308, RT715 in SDW mode, but can't be reproduced on TGL-U RVP with codec ALC711 in SDW mode and RT1308 in I2S mode.

[plbossart]

@YvonneYang2 same question as for issue #1865, does this happen with the master branches.

This is the same case of abrupt stops and discontinuities in the data, there's not much we can do at the SOF level. Only the amplifier could do something here.

[YvonneYang2]

Error still seen when playing same level audio file 

[ClarexZhou]

Error not seen with kernel sof-dev, commit: 0f90705, contains PR #1887 + PR #1897 and FW: https://github.com/thesofproject/sof/tree/cml-010-hot-fix, commit thesofproject/sof@0ed0dba + commit thesofproject/sof@f73332e

But still has slight noise on internal speaker with same kernel sof-dev, commit: 0f90705, contains PR #1887 + PR #1897 and FW: Master, commit: thesofproject/sof@afd9770

[YvonneYang2]

Error not seen with latest sof-dev+PR1897 and cml-010-hotfix2 branch except that has slight pop noise on internal speaker and headphone when switch foreground from background.

Kernel: https://github.com/thesofproject/linux/commits/topic/sof-dev commit:45f6424 + PR1897
FW : https://github.com/thesofproject/sof/commits/cml-010-hot-fix2 commit: 9ddcb00
Topology: Same with FW branch, sof-cml-rt711-rt1308-mono-rt715.tplg

[YvonneYang2]

Close it for PR #1897 merged.