[PATCH v2] Pioneer devices: engage implicit feedback sync for playback

[Geraldo Nascimento]

Hi, Olivia, thank you, glad you catched this and are able to test and debug
it. Let me know if I can be of any assistance.

Em Sex, 9 de abr de 2021 08:09, Olivia Mackintosh <livvy at base.nu> escreveu:

> On Mon, Apr 05, 2021 at 10:49:20AM -0300, Geraldo wrote:
> > Dear Linux users of Pioneer gear, please disregard v1 of this patch and
> > test this instead if at all possible.
> >
> > My initial assessment that we needed to let the capture EP be opened
> twice
> > was clearly proven wrong by further testing. This is good because if we
> > really needed that it would require a lot of reengineering inside ALSA.
> >
> > One thing that still boggles my mind though is why we need a special
> > Pioneer case inside snd_usb_parse_implicit_fb_quirk that returns 1 like a
> > capture quirk was found.
> >
> > This is a highly experimental patch on top of 5.12-rc6 that's supposed to
> > engage implicit feedback sync on the playback for Pioneer devices.
> Without
> > implicit feedback sync the inputs started glitching due to clock drift in
> > about an hour in my Pioneer DJ DDJ-SR2.
> >
> > Once again I'd like to thank Takashi Iwai. He's the true author of the
> bulk
> > of this code, I just adapted it and coerced it into working.
> >
> > Signed-off-by: Geraldo Nascimento <geraldogabriel at gmail.com>
>
> Thank you Geraldo and Takashi for working on this patch. I'm currently
> in the process of testing with the DJM-750 but it currently does not
> work as expected. I'll debug futher and report back but would like to
> make you aware of this in the meantime. It may not be a a fundamental
> issue with the patch, but rather something incidental.
>
> Kind regards,
> Olivia
>