On 3/10/2021 11:44 PM, Michael Walle wrote:

Btw I'm pretty sure, the MCLK was enabled and disabled depending on
whether there was an audio stream, the last time I've measured the
clock.

This may be true in your case because wm8904 driver does an explicit 
clock enable/disable and does not rely on simple-card-utils for this. In 
my case it depends on simple-card-utils.