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

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

On 23.06.2015 01:00, Anand Moon wrote:
> Hi Krzysztof
> 
> On 13 June 2015 at 13:45, Krzysztof Kozlowski <k.kozlowski@samsung.com
> <mailto:k.kozlowski@samsung.com>> wrote:
> 
>     2015-06-13 14:47 GMT+09:00 Krzysztof Kozlowski
>     <k.kozlowski@samsung.com <mailto:k.kozlowski@samsung.com>>:
>     > W dniu 13.06.2015 o 06:48, gabriel@unseen.is
>     <mailto:gabriel@unseen.is> pisze:
>     >> On 06/10/2015 10:22 AM, Krzysztof Kozlowski wrote:
>     >>>
>     >>> 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
>     >>>
>     >>
>     >> hi krzysztof,
>     >>
>     >> thanks a lot for your work. having only that patch applied
>     unfortunately
>     >> brought back the problem after something more than one day. the sound
>     >> became choppy/noisy again. I will now compile the -next kernel
>     and give
>     >> it a try.
>     >
>     > Thanks, I'll try to reproduce the issue on my Odroid. Can you
>     share more
>     > details how to reproduce it? The audio must play continuously or just
>     > from time to time but the board must be turned on for more than
>     one day?
> 
>     I bought some audio cables and successfully reproduced similar issue
>     (choppy sound) on Odroid XU3-Lite. On current linux-next
>     (next-20150612) the sound is awful (choppy) after few seconds of play.
>     For example first four of:
>     $ aplay /usr/share/sounds/alsa/Front_Right.wav
>     work fine. But then it just gets worse and underruns are reported:
>     $ Playing WAVE '/usr/share/sounds/alsa/Front_Right.wav' : Signed 16
>     bit Little Endian, Rate 48000 Hz, Mono
>     $ underrun!!! (at least 0.095 ms long)
> 
>     Reverting the commit aee4d1fac887 ("dmaengine: pl330: improve
>     pl330_tx_status() function") fixes this issue so this is not related
>     to missing "resume" function. At least this particular issue on my
>     Odroid is not related to missing resume but I did not try to play
>     sound for 24 hours.
>     My fix does not solve this. Probably "cc-stable" and "fixes" tags
>     should be dropped.
> 
>     Anyway I'll try to investigate it more. If anyone has any ideas,
>     please share.
> 
>     Best regards,
>     Krzysztof
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> 
> ​I gave it a try by enabling following config​ flags.
> 
> CONFIG_SND_SEQUENCER=m
> CONFIG_SND_SEQ_DUMMY=m
> CONFIG_SND_USB_AUDIO=m
> 
> I am able to play mp3 songs on Odroid-XU3 boards on vlc.
> Could you give it a try.

What do you mean? Which patch are you talking about? Are you aware that
I tried to fix this two times?

I already tested the latest fix on Odroid XU3 - which I mentioned in
commit. However it would be nice to get confirmation for fixing original
bug report (that specific conditions on that board which Gabriel reported).

Best regards,
Krzysztof