[PATCH 2/2] ALSA: hda/cs8409: Prevent pops and clicks during reboot

[Takashi Iwai]

On Thu, 26 Aug 2021 13:49:32 +0200,
Vitaly Rodionov wrote:
> 
> On 26/08/2021 11:49 am, Takashi Iwai wrote:
> > On Thu, 26 Aug 2021 08:03:45 +0200,
> > Takashi Iwai wrote:
> >> On Wed, 25 Aug 2021 20:04:05 +0200,
> >> Vitaly Rodionov wrote:
> >>> Actually when codec is suspended and we do reboot from UI, then sometimes we
> >>> see suspend() calls in kernel log and no pops, but sometimes
> >>>
> >>> we still have no suspend() on reboot and we hear pops. But when we do reboot
> >>> from command line: > sudo reboot  then we always have pops and no suspend()
> >>> called.
> >>>
> >>> Then we have added extra logging and we can see that on reboot codec somehow
> >>> getting resume() call and we run jack detect on resume that causing pops.
> >> Hm, it's interesting who triggers the runtime resume.
> >>
> >>> We were thinking about possible solution for that and we would propose some
> >>> changes in generic code hda_bind.c:
> >>>
> >>> static void hda_codec_driver_shutdown(struct device *dev) { +   if (codec->
> >>> patch_ops.suspend) +      codec->patch_ops.suspend(codec);
> >>> snd_hda_codec_shutdown(dev_to_hda_codec(dev)); +  hda_codec_driver_remove
> >>> (dev_to_hda_codec(dev)); }
> >> Sorry, it's no-no.  The suspend can't be called unconditionally, and
> >> the driver unbind must not be called in the callback itself.
> >>
> >> Does the patch below work instead?
> > Sorry there was a typo.  A bit more revised patch is below.
> >
> >
> > Takashi
> >
> > --- a/sound/pci/hda/hda_intel.c
> > +++ b/sound/pci/hda/hda_intel.c
> > @@ -1383,14 +1383,17 @@ static void azx_free(struct azx *chip)
> >   	hda->freed = 1;
> >   }
> >   -static int azx_dev_disconnect(struct snd_device *device)
> > +static void __azx_disconnect(struct azx *chip)
> >   {
> > -	struct azx *chip = device->device_data;
> >   	struct hdac_bus *bus = azx_bus(chip);
> >     	chip->bus.shutdown = 1;
> >   	cancel_work_sync(&bus->unsol_work);
> > +}
> >   +static int azx_dev_disconnect(struct snd_device *device)
> > +{
> > +	__azx_disconnect(device->device_data);
> >   	return 0;
> >   }
> >   @@ -2356,8 +2359,10 @@ static void azx_shutdown(struct pci_dev
> > *pci)
> >   	if (!card)
> >   		return;
> >   	chip = card->private_data;
> > -	if (chip && chip->running)
> > +	if (chip && chip->running) {
> > +		__azx_disconnect(chip);
> >   		azx_shutdown_chip(chip);
> > +	}
> >   }
> >     /* PCI IDs */
> 
> Hi Takashi,
> 
> Applied fix and tested on dolphin HW. Issue still there, here is
> captured screen on reboot from command line:
> 
> reboot capture
> 
> Reboot from UI works differently, no resume() call in this case.

Thanks for quick testing.

After reconsideration, I believe we can even take a simpler path.
Use pm_runtime_force_suspend(), and keep suspended by
pm_runtime_disable() call afterwards.

Below is another test patch.  Could you check whether this works
better?


Takashi

--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2986,13 +2986,11 @@ void snd_hda_codec_shutdown(struct hda_codec *codec)
 {
 	struct hda_pcm *cpcm;
 
-	if (pm_runtime_suspended(hda_codec_dev(codec)))
-		return;
-
 	list_for_each_entry(cpcm, &codec->pcm_list_head, list)
 		snd_pcm_suspend_all(cpcm->pcm);
 
-	pm_runtime_suspend(hda_codec_dev(codec));
+	pm_runtime_force_suspend(hda_codec_dev(codec));
+	pm_runtime_disable(hda_codec_dev(codec));
 }
 
 /*