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. Cheers, Gabriel -- 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
