Implicit feedback on BOSS GT-1, the saga continues...

[Mike Oliphant]

Hi Geraldo - I don't have that patch applied, but it shouldn't make any
behavioral difference - it just seems to be simplifying the code.

The issue is that the BOSS GT-1 *does* need implicit feedback on playback
to avoid clock timing issues, and the current behavior is disabling that
feedback.

Mike

On Wed, Apr 7, 2021 at 1:04 PM Geraldo Nascimento <geraldogabriel at gmail.com>
wrote:

> Hey Mike, did you catch the latest patch by Takashi Iwai for capture
> quirky devices?
>
> You can find it here:
> https://patchwork.kernel.org/project/alsa-devel/patch/20210406113837.32041-1-tiwai@suse.de/
>
> Em Qua, 7 de abr de 2021 16:55, Mike Oliphant <oliphant at nostatic.org>
> escreveu:
>
>> I had thought that the recent implicit feedback changes were fully working
>> on the BOSS GT-1, but it turns out that I just hadn't tested well enough.
>>
>> Audio playback and capture works, but with periodic dropouts. I get the
>> exact same behavior as I did with the quirk to completely disable implicit
>> feedback. Without the implicit feedback, you get dropouts from clock drift
>> - how bad probably varies from card to card. On mine it is every second or
>> so.
>>
>> If I switch playback feedback for the GT-1 to generic by doing
>> "IMPLICIT_FB_GENERIC_DEV(0x0582, 0x01d6)", I get the previous old
>> behavior,
>> which is that playback completely fails to start.
>>
>> With generic playback feedback, and using my previous patch to endpoint.c
>> to avoid playback waiting on capture mentioned here:
>>
>>
>> https://mailman.alsa-project.org/pipermail/alsa-devel/2020-January/161951.html
>>
>> playback and capture work perfectly for me.
>>
>