[alsa-devel] poll blocked after prepare state

[Takashi Iwai]

On Mon, 25 Jun 2018 11:59:02 +0200,
Harald Schuster wrote:
> 
> 
> Hi
> We are not able to update our system. We are using USB codecs which
> are working fine but they are using the snd_pcm_hw_prepare function.
> The Problem only exists for the I2S codec in our system. When i
> changed the buffer size in the asound.conf for the codec the problem
> allready exists but it arise not so often because there is not so
> often a underrun. Is there any hint where i could lock for the
> problem?!

Well, with that little information, it's hard to advice anything...


Takashi

> br Harald
> 
> Zitat von Takashi Iwai <tiwai at suse.de>:
> 
> > On Fri, 22 Jun 2018 20:36:12 +0200,
> > Harald Schuster wrote:
> >>
> >>
> >> Zitat von Takashi Iwai <tiwai at suse.de>:
> >>
> >> > On Fri, 22 Jun 2018 15:29:21 +0200,
> >> > Harald Schuster wrote:
> >> >>
> >> >> I found out that an underrun occours and so the pcm_prepare function
> >> >> for pcm_direct is called and then pcm_start_dshare is called. Both
> >> >> functions returns without any error but the playback path is blocked
> >> >> in the snd_pcm_wait_nocheck function. I read that there was an similar
> >> >> problem before in the group but i didn't found any solution. Is this a
> >> >> problem in the driver and how can i go forward to fix it. The codec is
> >> >> a tlv320aic3x-audio. Thanks for your help.
> >> >
> >> > Does this happen with the very latest alsa-lib git version?
> >> > Just to be sure.
> >> >
> >> >
> >> > Takashi
> >> > _______________________________________________
> >> > Alsa-devel mailing list
> >> > Alsa-devel at alsa-project.org
> >> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>
> >> Hi
> >> We are using k4.1.15-6QP+ga2066af.
> >
> > I'm asking the alsa-lib, not kernel.
> >
> > And 4.1.x is very old...  Please check either 4.17.x or latest Linus
> > tree whether the problem persists, too.
> >
> >
> > Takashi
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
> 
> 
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