From 5e35dc0338d85ccebacf3f77eca1e5dea73155e8 Mon Sep 17 00:00:00 2001
From: Lassi Ylikojola <lassi.ylikojola@gmail.com>
Date: Fri, 9 Feb 2018 16:51:36 +0200
Subject: [PATCH] ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204
Git-commit: 5e35dc0338d85ccebacf3f77eca1e5dea73155e8
Patch-mainline: v4.16-rc2
References: bsc#1051510

Add quirk to ensure a sync endpoint is properly configured.
This patch is a fix for same symptoms on Behringer UFX1204 as patch
from Albertto Aquirre on Dec 8 2016 for Axe-Fx II.

Signed-off-by: Lassi Ylikojola <lassi.ylikojola@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/usb/pcm.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -357,6 +357,15 @@ static int set_sync_ep_implicit_fb_quirk
 
 		alts = &iface->altsetting[1];
 		goto add_sync_ep;
+	case USB_ID(0x1397, 0x0002):
+		ep = 0x81;
+		iface = usb_ifnum_to_if(dev, 1);
+
+		if (!iface || iface->num_altsetting == 0)
+			return -EINVAL;
+
+		alts = &iface->altsetting[1];
+		goto add_sync_ep;
 
 	}
 	if (attr == USB_ENDPOINT_SYNC_ASYNC &&