[alsa-devel] [PATCH 3/3] ALSA: snd-usb: add delay quirk for "Playback Design" products

[Daniel Mack]

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

Signed-off-by: Daniel Mack <zonque at gmail.com>
Reported-by: Andreas Koch <andreas at akdesigninc.com>
---
 sound/usb/pcm.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index f94397b..c263991 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,
-- 
1.7.10.4