Commit 36e1ac3c authored Aug 22, 2016 by Daniel Mack Committed by Takashi Iwai Aug 22, 2016

ALSA: usb: fine-tune Tenor error compensation value

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 <norman.nolte@gmx.net>
Reported-and-tested-by: Thomas Gresens <T.Gresens@intershop.de>
Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent ca0dd273

sound/usb/endpoint.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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