I just checked the solution from this thread 
https://bugzilla.kernel.org/show_bug.cgi?id=201251 and it worked for DMIC, it 
appeared.
So what was needed in my case is
options snd_pcm max_alloc_per_card=41943040
I tried in ArchLinux 5.11.7.
Only issue is that  the recording level too quiet and in fact is non 
operational ), but i think it is a great step forward any case. It is the first 
time when i saw microphone in Linux settings on my Lenovo Yoga C930 )
You should use no snd_intel_dspcfg dsp_driver options or use only
options snd_intel_dspcfg dsp_driver=2
Would be great to find solution to fix the level of recording now.

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https://bugs.launchpad.net/bugs/1845797

Title:
  Microphone not detected Lenovo Yoga S940

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