W dniu 13.06.2015 o 06:48, gabriel@xxxxxxxxx pisze: > 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. 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? Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
