[PATCH] ALSA: hda: avoid write to STATESTS if controller is in reset

[Kai Vehmanen]

Hi,

On Tue, 12 Oct 2021, Takashi Iwai wrote:

> > The snd_hdac_bus_reset_link() contains logic to clear STATESTS register
> > before performing controller reset. This code dates back to an old
> > bugfix in commit e8a7f136f5ed ("[ALSA] hda-intel - Improve HD-audio
> > codec probing robustness"). Originally the code was added to
> > azx_reset().
[...]
> Do we have a bug reference?  I guess it worth to be pushed to 5.15-rc
> and Cc-to-stable, if this is hitting already on the recent machines.

I unfortunately don't have a public bug reference to share. This will 
impact PCIe based Intel hardware like DG1. The DRM support is quite 
recent for these, so in practise this only affects 5.15-rc and newer.

And even on these, the functionality will be ok, it's just the warnings 
that fill the kernel log that are a problem.

Br, Kai