On Tue, 19 Nov 2019 17:36:46 +0100, Ranjani Sridharan wrote: > > On Tue, 2019-11-19 at 09:24 +0100, Takashi Iwai wrote: > > On Tue, 19 Nov 2019 08:40:25 +0100, > > Ranjani Sridharan wrote: > > > > > > > > > > > > > Hi Takashi, > > > > > > > > > > I just realized that In the SOF driver, we only set the > > > > > component > > > > > driver ops. The pcm ops are set when creating the new pcm. So, > > > > > should I > > > > > also add the sync_stop op in the component driver and set the > > > > > pcm > > > > > sync_stop op to point to the component sync_stop op? Just > > > > > wanted to > > > > > confirm if I am on the right track. > > > > > > > > Yes, I didn't touch this yet, but that's the way to go I suppose. > > > > One caveat is that this ops is optional and needs NULL as > > > > default, > > > > hence you'd need to set only when defined, like copy_user, page > > > > or > > > > mmap ops, at least. > > > > > > Hi Takashi, > > > > > > This is what I tried in the SOF driver: > > > https://github.com/thesofproject/linux/pull/1513/commits > > > > > > And it seems to cause the system to hang when I stop the stream and > > > I > > > have no meaningful logs to pinpoint to the problem. Could you > > > please > > > have a look at the 4 commits that I have added to your series and > > > let > > > me know what I could be missing? > > > > I couldn't find anything obvious. Could you try without changing > > snd_sof_pcm_period_elapsed(), i.e. only adding the stuff and calling > > sync_stop, in order to see whether the additional stuff broke > > anything? > It is indeed the removal of snd_sof_pcm_period_elapsed() that makes the > device hang when the stream is stoppped. But that's a bit surprising > given that all I tried was using the snd_pcm_period_elapsed() directly > instead of scheduling the delayed work to call it. If I read the code correctly, this can't work irrelevantly from the sync_stop stuff. The call of period_elapsed is from hda_dsp_stream_check() which is performed in bus->reg_lock spinlock in hda_dsp_stream_threaded_handler(). Meanwhile, the XRUN trigger goes to hda_dsp_pcm_trigger() that follows hda_dsp_stream_trigger(), and this function expects the sleepable context due to snd_sof_dsp_read_poll_timeout() call. So something like below works? Takashi --- a/sound/soc/sof/intel/hda-stream.c +++ b/sound/soc/sof/intel/hda-stream.c @@ -592,8 +592,11 @@ static bool hda_dsp_stream_check(struct hdac_bus *bus, u32 status) continue; /* Inform ALSA only in case not do that with IPC */ - if (sof_hda->no_ipc_position) - snd_sof_pcm_period_elapsed(s->substream); + if (sof_hda->no_ipc_position) { + spin_unlock_irq(&bus->reg_lock); + snd_pcm_period_elapsed(s->substream); + spin_lock_irq(&bus->reg_lock); + } } } _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
