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

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2015-06-09 20:25 GMT+09:00  <gabriel@xxxxxxxxx>:
> On 06/03/2015 02:05 AM, Krzysztof Kozlowski wrote:
>> On 03.06.2015 04:51, gabriel@xxxxxxxxx wrote:
>>> 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.
>>
>>
>> +CC Marek,
>>
>> Robert, Marek, do you have any idea for the cause?
>>
>
> I can now say for sure that the commits 88987d2c75 and aee4d1fac8 are
> the cause for the problem. Audio was working now for 7 days.

+CC Vinod

Gabriel,

I sent a patch which should fix the issue. Could you give it a try? Of
course don't revert the other patches and don't use other workarounds.
Just apply the patch on clean (vanilla would be the best) kernel.
[RFT PATCH] dmaengine: Fix choppy sound because of unimplemented resume

Best regards,
Krzysztof
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