[PATCH] ALSA: usb-audio: Add implicit feedback quirk for Zoom UAC-2

[Keith Winstein]

Here is the patch again without line-wrapping.

>From 2c8d691d39ab2824c344ac2562a1e8605b3384ba Mon Sep 17 00:00:00 2001
From: Keith Winstein <keithw at cs.stanford.edu>
Date: Sun, 25 Oct 2020 22:05:47 -0700
Subject: [PATCH] ALSA: usb-audio: Add implicit feedback quirk for Zoom UAC-2

Signed-off-by: Keith Winstein <keithw at cs.stanford.edu>
Tested-by: Keith Winstein <keithw at cs.stanford.edu>
---
 sound/usb/pcm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index b401ee894e1b..5723e8e69cf1 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -352,6 +352,10 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 		ep = 0x81;
 		ifnum = 2;
 		goto add_sync_ep_from_ifnum;
+	case USB_ID(0x1686, 0xf029): /* ZOOM UAC-2 */
+		ep = 0x82;
+		ifnum = 2;
+		goto add_sync_ep_from_ifnum;
 	case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 	case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 		ep = 0x81;
-- 
2.25.1