From: Lassi Ylikojola <lassi.ylikojola@gmail.com>
Date: Fri, 9 Feb 2018 14:51:36 +0000 (+0200)
Subject: ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204
X-Git-Tag: v6.6-pxa1908~14759^2~2^2~3
X-Git-Url: https://git.dujemihanovic.xyz/?a=commitdiff_plain;h=5e35dc0338d85ccebacf3f77eca1e5dea73155e8;p=linux.git

ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204

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>
---

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index b9c9a19f9588..3cbfae6604f9 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -352,6 +352,15 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 		ep = 0x86;
 		iface = usb_ifnum_to_if(dev, 2);
 
+		if (!iface || iface->num_altsetting == 0)
+			return -EINVAL;
+
+		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;