missing sound on kernel-5.15

[Chihhao Chen (陳志豪)]

Hi Takashi,

I noticed you applied related patches to kernel-6.1 and reverted the
patch on kernel-5.15. Would you please patch back to kernel-5.15
because there will be more and more kernel-5.15 smart phones?

Thanks
Chihhao

On Thu, 2022-09-01 at 12:25 +0200, Takashi Iwai wrote:
> On Thu, 01 Sep 2022 12:06:25 +0200,
> chihhao chen wrote:
> >
> > Hi Takashi,
> >
> > I tested the patch and USB audio function works well.
> > (Start and stop playback more than 20 times with Samsung USB C
> > Earphone)
>
> Great, thanks for quick testing!
>
>
> Takashi
>
> >
> > Thanks
> >
> > On Thu, 2022-09-01 at 10:28 +0200, Takashi Iwai wrote:
> > > On Thu, 01 Sep 2022 09:51:37 +0200,
> > > Takashi Iwai wrote:
> > > >
> > > > On Thu, 01 Sep 2022 07:50:40 +0200,
> > > > chihhao chen wrote:
> > > > >
> > > > > Hi Takashi,
> > > > >
> > > > > The patch fixes this problem.
> > > > > I tried it with "Product: Samsung USB C Earphone" and missing
> > > > > sound
> > > > > problem cannot be reproduced.
> > > >
> > > > OK, it's a good news.  I'm going to add more information to the
> > > > patch
> > > > description about the regression and submit the patch.
> > >
> > > Could you check whether the below cleanup patch on top of the
> > > previous
> > > one doesn't break things?  I lightly tested on my devices and
> > > don't
> > > believe it would change the actual behavior, but just to be sure.
> > >
> > >
> > > Takashi
> > >
> > > -- 8< --
> > > From: Takashi Iwai <tiwai at suse.de>
> > > Subject: [PATCH] ALSA: usb-audio: Clean up endpoint setups at PCM
> > > prepare
> > >
> > > This patch cleans up the superfluous checks and calls for setting
> > > up
> > > the endpoints at PCM prepare callback:
> > >
> > > - Drop stop_endpoints() and sync_pending_stops() calls; the
> > > stream is
> > >   guaranteed to have been already stopped and synced at each PCM
> > >   prepare call by ALSA PCM core
> > >
> > > - Call snd_usb_endpoint_prepare() unconditionally;
> > >   the check for endpoint->need_setup is done in
> > >   snd_pcm_hw_endpoint_prepare() itself
> > >
> > > - Apply snd_usb_set_format_quirk() only when the endpoint is
> > > actually
> > >   set up (i.e. the return code from snd_usb_endpoint_prepare() >
> > > 0)
> > >
> > > - Move a few lines back into snd_usb_pcm_prepare();
> > >   it's even easier to follow than a small useless function
> > >
> > > Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > > ---
> > >  sound/usb/pcm.c | 40 ++++++++++------------------------------
> > >  1 file changed, 10 insertions(+), 30 deletions(-)
> > >
> > > diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
> > > index b604f7e95e82..4ed53a3dc922 100644
> > > --- a/sound/usb/pcm.c
> > > +++ b/sound/usb/pcm.c
> > > @@ -433,35 +433,6 @@ static void close_endpoints(struct
> > > snd_usb_audio
> > > *chip,
> > >  }
> > >  }
> > >
> > > -static int configure_endpoints(struct snd_usb_audio *chip,
> > > -       struct snd_usb_substream *subs)
> > > -{
> > > -int err;
> > > -
> > > -if (subs->data_endpoint->need_setup) {
> > > -/* stop any running stream beforehand */
> > > -if (stop_endpoints(subs, false))
> > > -sync_pending_stops(subs);
> > > -if (subs->sync_endpoint) {
> > > -err = snd_usb_endpoint_prepare(chip, subs-
> > > > sync_endpoint);
> > >
> > > -if (err < 0)
> > > -return err;
> > > -}
> > > -err = snd_usb_endpoint_prepare(chip, subs-
> > > > data_endpoint);
> > >
> > > -if (err < 0)
> > > -return err;
> > > -snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
> > > -} else {
> > > -if (subs->sync_endpoint) {
> > > -err = snd_usb_endpoint_prepare(chip, subs-
> > > > sync_endpoint);
> > >
> > > -if (err < 0)
> > > -return err;
> > > -}
> > > -}
> > > -
> > > -return 0;
> > > -}
> > > -
> > >  /*
> > >   * hw_params callback
> > >   *
> > > @@ -640,9 +611,18 @@ static int snd_usb_pcm_prepare(struct
> > > snd_pcm_substream *substream)
> > >  goto unlock;
> > >  }
> > >
> > > -ret = configure_endpoints(chip, subs);
> > > +if (subs->sync_endpoint) {
> > > +ret = snd_usb_endpoint_prepare(chip, subs-
> > > > sync_endpoint);
> > >
> > > +if (ret < 0)
> > > +goto unlock;
> > > +}
> > > +
> > > +ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
> > >  if (ret < 0)
> > >  goto unlock;
> > > +else if (ret > 0)
> > > +snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
> > > +ret = 0;
> > >
> > >  /* reset the pointer */
> > >  subs->buffer_bytes = frames_to_bytes(runtime, runtime-
> > > > buffer_size);


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