[alsa-devel] poll blocked after prepare state

[Takashi Iwai]

On Mon, 25 Jun 2018 15:43:15 +0200,
Harald Schuster wrote:
> 
> Hi
> The codec is the TI tlv320aic3x and the buffersize is set to 64 and
> the periodsize is set to 32 in the asound.conf. We use the pjProject
> for the audioprocessing and the internal period time is 4ms and the
> sample rate is 8000 Hz. The second codec is a USB codec which has no
> problems. Our scenario is that a incoming VOIP call is connected to
> the both codec (I2s and USB) and the USB codec starts the playback
> without any problems and the tlv320 sometimes works but when a
> underrun accours it crash!

Is it really so hardware-specific problem?

And, did you follow the recent development / fixes if it's about
dshare plugin?  There have been lots of changes.

I'm not asking about updating the kernels.  The question is rather
about alsa-lib.


Takashi

> 
> best regards Harald
> 
> 
> Zitat von Takashi Iwai <tiwai at suse.de>:
> 
> > 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
> >>
> >>
> >>
> >> _______________________________________________
> >> Alsa-devel mailing list
> >> Alsa-devel at alsa-project.org
> >> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
> 
> 
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