Re: exynos4412: Audio dies after one day on kernel 4.0

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On 05/31/2015 08:47 AM, Krzysztof Kozlowski wrote:
> 2015-05-31 2:32 GMT+09:00  <gabriel@xxxxxxxxx>:
>>
>> Hello,
>>
>> I've been successfully using a self compiled linux kernel until version
>> 3.19 together with Debian Stretch.
>>
>> After upgrading the kernel to version 4.0 I see strange messages in the
>> logs i.e.
>>
>> May 27 22:44:01 pulseaudio[1027]: [alsa-sink-3830000.i2s-HiFi HiFi-0]
>> alsa-sink.c: ALSA woke us up to write new data to the device, but there
>> was actually nothing to write!
>> May 27 22:44:01 pulseaudio[1027]: [alsa-sink-3830000.i2s-HiFi HiFi-0]
>> alsa-sink.c: Most likely this is a bug in the ALSA driver
>> 'snd_soc_simple_card'. Please report this issue to the ALSA developers.
>> May 27 22:44:01 pulseaudio[1027]: [alsa-sink-3830000.i2s-HiFi HiFi-0]
>> alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent
>> snd_pcm_avail() returned 0 or another value < min_avail.
>>
>>
>> I can easily play sound in perfect quality for approx the first 24h.
>> After that time the sound becomes distorted and is choppy/crackling.
>> After rebooting then the sound is optimal again.
>>
>>
>> I have tried to use kernel 4.0 with almost exactly the same
>> configuration than for 3.19 to no avail.
>>
>> Then somebody on
>> http://forum.odroid.com/viewtopic.php?f=82&t=13281&p=91186 gave me the
>> hint that the followin patch might solve the issue:
>>
>> https://github.com/prahal/linux/commit/5e60cfc9fa5101a346e29ef5f944fbbad300c72d
>>
>>
>> The patch did help something. I can now still play music after 2 days
>> but what happens is that each time I turn on music I get a choppy sound
>> for some time. That means the sound comes clear but every 2 seconds the
>> sound pauses for a fraction of a second. Which is somewhat comparable to
>> the issue earlier but without the heavy crackling - and that this goes
>> away after a couple of minutes.
>>
>>
>> But furthermore the sound has now simple cracklings. One in two second
>> approx. and they do not disappear.
>>
>>
>> Does anybody have an idea what could be the matter here?
>>
>> Thanks in advance.
> 
> +Cc Robert, dmaengine list.
> 
> Bisecting would be helpful. You could also try reverting following commits:
> 88987d2c75
> aee4d1fac8
> 
> Other possible test case would be disabling runtime PM for pl330 DMA driver:
> 
> for i in /sys/bus/amba/drivers/dma-pl330/*.[amp]dma/power ; do
>   echo "on" > ${i}/control
> done
> 

Thanks a lot Krzysztof,

I have reverted 88987d2c75 and aee4d1fac8 from 4.0.4 and I have still
audio working after 1 and 1/2 day. Unluckily the alsa error message
occured still once but they don't seem to be the issue here.


Do you need to have tested out something else?

Best regards,
Gabriel


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