From: Geoffrey D. Bennett <g@b4.vu>
Date: Wed, 4 Nov 2020 11:57:17 +0000 (+1030)
Subject: ALSA: usb-audio: Add implicit feedback quirk for Qu-16
X-Git-Tag: v4.4.242~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5dbe2f34d5d526c8b7ad0febeb273dd1a560d3b0;p=thirdparty%2Fkernel%2Fstable.git

ALSA: usb-audio: Add implicit feedback quirk for Qu-16

commit 0938ecae432e7ac8b01080c35dd81d50a1e43033 upstream.

This patch fixes audio distortion on playback for the Allen&Heath
Qu-16.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201104115717.GA19046@b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index c97d9a537f763..366813f1a5f80 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -332,6 +332,7 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 	switch (subs->stream->chip->usb_id) {
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
+	case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
 		ep = 0x81;
 		iface = usb_ifnum_to_if(dev, 3);