Geraldo - here is the dmesg output when starting up jackd for capture/playback:
With my patch:
[ 136.734081] usb 3-1.2: Open EP 0x8e, iface=2:1, idx=0 [ 136.734088] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=0 [ 136.734092] usb 3-1.2: Setting usb interface 2:0 for EP 0x8e [ 136.734233] usb 3-1.2: Setting usb interface 2:1 for EP 0x8e [ 136.734381] usb 3-1.2: 2:1 Set sample rate 44100, clock 0 [ 136.734388] usb 3-1.2: Setting params for data EP 0x8e, pipe 0x70480 [ 136.734394] usb 3-1.2: Set up 12 URBS, ret=0 [ 136.734466] usb 3-1.2: Open EP 0xd, iface=1:1, idx=0 [ 136.734468] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=1 [ 136.734471] usb 3-1.2: Reopened EP 0x8e (count 1) [ 136.734473] usb 3-1.2: Setting usb interface 1:0 for EP 0xd [ 136.734605] usb 3-1.2: Setting usb interface 1:1 for EP 0xd [ 136.734762] usb 3-1.2: 1:1 Set sample rate 44100, clock 0 [ 136.734774] usb 3-1.2: Setting params for data EP 0xd, pipe 0x68400 [ 136.734781] usb 3-1.2: Set up 12 URBS, ret=0 [ 136.734830] usb 3-1.2: Starting data EP 0xd (running 0) [ 136.734873] usb 3-1.2: 12 URBs submitted for EP 0xd [ 136.734876] usb 3-1.2: Starting data EP 0x8e (running 0) [ 136.734906] usb 3-1.2: 12 URBs submitted for EP 0x8e [ 136.740627] usb 3-1.2: Starting data EP 0x8e (running 1) [ 136.740634] usb 3-1.2: 2:1 Start Capture PCM [ 136.740635] usb 3-1.2: 1:1 Start Playback PCM
With the unpatched kernel:
[ 344.813203] usb 3-1.2: Open EP 0x8e, iface=2:1, idx=0 [ 344.813210] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=1 [ 344.813213] usb 3-1.2: Open EP 0xd, iface=1:1, idx=0 [ 344.813215] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=0 [ 344.813217] usb 3-1.2: Setting usb interface 2:0 for EP 0x8e [ 344.813367] usb 3-1.2: Setting usb interface 2:1 for EP 0x8e [ 344.813494] usb 3-1.2: 2:1 Set sample rate 44100, clock 0 [ 344.813503] usb 3-1.2: Setting params for data EP 0x8e, pipe 0x70580 [ 344.813509] usb 3-1.2: Set up 12 URBS, ret=0 [ 344.813513] usb 3-1.2: Setting usb interface 1:0 for EP 0xd [ 344.813587] usb 3-1.2: Setting usb interface 1:1 for EP 0xd [ 344.813758] usb 3-1.2: 1:1 Set sample rate 44100, clock 0 [ 344.813765] usb 3-1.2: Setting params for data EP 0xd, pipe 0x68500 [ 344.813770] usb 3-1.2: Set up 2 URBS, ret=0 [ 344.813858] usb 3-1.2: Reopened EP 0xd (count 1) [ 344.813883] usb 3-1.2: Starting data EP 0xd (running 0) [ 344.813899] usb 3-1.2: 2 URBs submitted for EP 0xd [ 344.819499] usb 3-1.2: Starting data EP 0x8e (running 0) [ 344.819532] usb 3-1.2: 12 URBs submitted for EP 0x8e [ 344.819535] usb 3-1.2: Starting data EP 0xd (running 1) [ 344.819538] usb 3-1.2: 2:1 Start Capture PCM [ 344.819540] usb 3-1.2: 1:1 Start Playback PCM [ 344.820663] usb 3-1.2: Stopping data EP 0xd (running 2) [ 344.820688] usb 3-1.2: Stopping data EP 0x8e (running 1) [ 344.820693] usb 3-1.2: 2:1 Stop Capture PCM [ 344.820695] usb 3-1.2: Stopping data EP 0xd (running 1) [ 344.820697] usb 3-1.2: 1:1 Stop Playback PCM [ 344.833799] usb 3-1.2: Starting data EP 0xd (running 0) [ 344.833852] usb 3-1.2: 2 URBs submitted for EP 0xd [ 344.833867] usb 3-1.2: Starting data EP 0x8e (running 0) [ 344.833888] usb 3-1.2: 12 URBs submitted for EP 0x8e [ 344.833890] usb 3-1.2: Starting data EP 0xd (running 1) [ 344.833891] usb 3-1.2: 2:1 Start Capture PCM [ 344.833893] usb 3-1.2: 1:1 Start Playback PCM
On Wed, Apr 7, 2021 at 1:30 PM Geraldo Nascimento geraldogabriel@gmail.com wrote:
Em Qua, 7 de abr de 2021 17:16, Mike Oliphant oliphant@nostatic.org escreveu:
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.
Point taken.
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, would you mind posting some dyndbg logs for both the stock behaviour and your endpoint.c/generic quirk modified behaviour?
Just add snd_usb_audio.dyndbg=+p to your kernel options and please share the logs.
Mike
On Wed, Apr 7, 2021 at 1:04 PM Geraldo Nascimento < geraldogabriel@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...
Em Qua, 7 de abr de 2021 16:55, Mike Oliphant oliphant@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.ht...
playback and capture work perfectly for me.