On 06/10/2015 10:22 AM, Krzysztof Kozlowski wrote: > 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 > 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. best regards, gabriel -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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