From: Daniel Mack <zonque@gmail.com>
Date: Sun, 17 Mar 2013 12:07:26 +0000 (+0800)
Subject: ALSA: snd-usb: add delay quirk for "Playback Design" products
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=0959f22ee66734c212fc733f7616ba321ef7f47f;p=deliverable%2Flinux.git

ALSA: snd-usb: add delay quirk for "Playback Design" products

"Playback Design" products need a 50ms delay after setting the USB
interface.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Reported-by: Andreas Koch <andreas@akdesigninc.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index f94397b42aa5..c263991b3b9d 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -350,6 +350,13 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 				fmt->iface, fmt->altsetting);
 		subs->interface = fmt->iface;
 		subs->altset_idx = fmt->altset_idx;
+
+		/*
+		 * "Playback Design" products need a 50ms delay after setting the
+		 * USB interface.
+		 */
+		if (le16_to_cpu(dev->descriptor.idVendor) == 0x23ba)
+			mdelay(50);
 	}
 
 	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,