[alsa-devel] [PATCH] ALSA: usb-audio: Disable quirks for BOSS Katana amplifiers

[Mailing Lists]

Hi Mike,
That's odd. I've been using the patches in this thread with both my GT-001
and my GT-1 with no issues for a few weeks now. Of course that might be
pure dumb luck and differences in hardware, interrupts, and so on.

Cheers,

Keith

On Wed, 14 Oct 2020 at 16:19, Mike Oliphant <oliphant at nostatic.org> wrote:

> When I tried this change earlier this year on the BOSS GT-1, it enabled
> sound output on the card (which was not previously working), but with
> significant issues. It resulted in frequent pops and crackles - presumably
> because of the loss of synchronization using implicit feedback.
>
> This was the fix that ended up working for me:
>
>
> https://mailman.alsa-project.org/pipermail/alsa-devel/2020-January/161951.html
>
> But maybe something else has changed in the handling of implicit feedback
> since then?
>
> Mike
>
> On Wed, Oct 14, 2020 at 5:17 AM Mailing Lists <maillist at superlative.org>
> wrote:
>
>> Following up on this, it appears there are a bunch of the
>> newer-generation Roland/Boss devices which need similar treatment.
>>
>> So far I have tested the GT-1, the GT-001, and the BR-80, and others have
>> reported the RC-300 as working with similar modifications. I have been
>> using the following change to the code in pcm.c
>> set_sync_ep_implicit_fb_quirk:
>>
>>     case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
>>     case USB_ID(0x0582, 0x0130): /* BOSS Micro BR-80 */
>>     case USB_ID(0x0582, 0x0138): /* BOSS RC-300 */
>>     case USB_ID(0x0582, 0x01d6): /* BOSS GT-1 */
>>     case USB_ID(0x0582, 0x01e5): /* BOSS GT-001 */
>> /* BOSS Katana amplifiers and many other newer BOSS devices do not need
>> quirks */
>>
>> There's probably others too, such as the GT-100 (I believe the GT-001 and
>> GT-100 have similar hardware).
>>
>> My question is, should this just be submitted as a patch to pcm.c or
>> would it be better handled in quirks and, if so, how?
>>
>> Or something else?
>>
>> Personally, I dislike the approach of hard-coding exceptions into core
>> code as it seems that's what quirks are there for, but there seems to be a
>> whole bunch of exceptions in there already.
>>
>> Cheers,
>>
>> Keith
>>
>> On Thu, 17 Oct 2019 at 09:20, Takashi Iwai <tiwai at suse.de> wrote:
>>
>>> On Fri, 11 Oct 2019 19:19:36 +0200,
>>> Szabolcs Szőke wrote:
>>> >
>>> > BOSS Katana amplifiers cannot be used for recording or playback if
>>> quirks
>>> > are applied
>>> >
>>> > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=195223
>>> > Signed-off-by: Szabolcs Szőke <szszoke.code at gmail.com>
>>>
>>> Applied now.  Thanks.
>>>
>>>
>>> Takashi
>>>
>>> >
>>> > ---
>>> >  sound/usb/pcm.c | 3 +++
>>> >  1 file changed, 3 insertions(+)
>>> >
>>> > diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
>>> > index 33cd26763c0e..daadb0c66eee 100644
>>> > --- a/sound/usb/pcm.c
>>> > +++ b/sound/usb/pcm.c
>>> > @@ -348,6 +348,9 @@ static int set_sync_ep_implicit_fb_quirk(struct
>>> snd_usb_substream *subs,
>>> >               ep = 0x84;
>>> >               ifnum = 0;
>>> >               goto add_sync_ep_from_ifnum;
>>> > +     case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
>>> > +             /* BOSS Katana amplifiers do not need quirks */
>>> > +             return 0;
>>> >       }
>>> >
>>> >       if (attr == USB_ENDPOINT_SYNC_ASYNC &&
>>> > --
>>> > 2.20.1
>>> >
>>> _______________________________________________
>>> Alsa-devel mailing list
>>> Alsa-devel at alsa-project.org
>>> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>>
>>
>>
>> --
>> --
>> Keith A Milner
>>
>

-- 
-- 
Keith A Milner