[alsa-devel] poll blocked after prepare state

[Harald Schuster]

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?!
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