Sound issues with the 5.10.x kernel (alsa)

[Diederik de Haas]

Hi,

This is basically me forwarding the bug I reported on Debian's BTS:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978025

TL;DR: I have a RPi 3B+ running pure Debian Bullseye arm64 (~from 
raspi.debian.net), named rpi-mpd, connected via HDMI cable to my AV Receiver.
Playing music worked fine with kernel 5.9, but with 5.10.2-1 the music 
(quality) became not good to quite horribly, because of (static) noise and 
distortion.
With kernel version 5.10.9 (linux-image-5.10.0-2-arm64) it all seemed fixed, 
but returned with 5.10.12 (linux-image-5.10.0-3-arm64) and is also present 
with 5.10.13.

I can consistently reproduce this issue, rebooting into 5.10.9 and playing 
music is fine again, so I *think* this is not a local issue.
This ML is the closest I can think of as 'upstream', so hopefully more insight  
can be accomplished here ... and a fix.

Cheers,
  Diederik
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