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.ht...
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@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@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@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
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Keith A Milner