[alsa-devel] poll blocked after prepare state

[Harald Schuster]

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!

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
>>
>>
>>
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