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ALSA: usb: fine-tune Tenor error compensation value

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Users of devices affected by the Tenor feedback data error report
buffer underruns, even with the +/- 0x1.0000 quirk applied.
Compensating the error with 0xf000 instead seems to reliably fix
that issue.

See

  https://sourceforge.net/p/alsa/mailman/message/35230259/

Reported-and-tested-by: Norman Nolte <[email protected]>
Reported-and-tested-by: Thomas Gresens <[email protected]>
Signed-off-by: Daniel Mack <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Daniel Mack 2016-08-22 08:53:38 +02:00 • committed by Takashi Iwai
commit 36e1ac3cf8
1 changed files with 2 additions and 2 deletions
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4
sound/usb/endpoint.c
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@ -1174,9 +1174,9 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
* by +/- 0x1.0000.
*/
if (f < ep->freqn - 0x8000)
f += 0x10000;
f += 0xf000;
else if (f > ep->freqn + 0x8000)
f -= 0x10000;
f -= 0xf000;
} else if (unlikely(ep->freqshift == INT_MIN)) {
/*
* The first time we see a feedback value, determine its format