Re: missing sound on kernel-5.15

[Takashi Iwai <tiwai@suse.de>]

On Tue, 30 Aug 2022 07:54:59 +0200,
Takashi Iwai wrote:
> 
> On Mon, 29 Aug 2022 20:15:33 +0200,
> Takashi Iwai wrote:
> > 
> > On Mon, 29 Aug 2022 14:16:27 +0200,
> > Takashi Iwai wrote:
> > > 
> > > On Mon, 29 Aug 2022 10:50:58 +0200,
> > > chihhao chen wrote:
> > > > 
> > > > Hi Takashi,
> > > > 
> > > > Yes.
> > > > 
> > > > To issue SAMPLING_FREQ_CONTROL USB request two times is root cause of
> > > > this issue.
> > > 
> > > Hm, is it a UAC1 device?  Such a device should work with multiple
> > > SAMPLING_FREQ_CONTROL invocations, but some device might be not
> > > tolerant or buggy...  The multiple init_sample_rate() invocations may
> > > happen with the older kernel under certain situations, so maybe we
> > > need a different fix.
> > > 
> > > How about the patch like below?
> > 
> > It's missing the clearance for suspend/resume.
> > The revised patch is below.
> 
> ... and after reading the mail again, I noticed that it's all
> rubbish, scratch the previous ones.
> 
> Have you tested it with the later kernel?  I guess this has been
> already addressed.  In the recent kernel, the rate is set per assigned
> clock, hence it won't be set up twice unnecessarily.

That said, try to cherry-pick the upstream commit
c11117b634f4f832c4420d3cf41c44227f140ce1.

If this is confirmed to work, we can ask Greg to merge it into 5.15.y
stable tree.


Takashi