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. Do you need to have tested out something else? 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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