ALSA: snd-usb: Playback Design: use usb_set_inferface quirk from more locations

It turns out the devices from Playback Design need the delay quirk
after usb_set_interface from clocks.c as well. Make it a proper
quirks function and factor out the code to quirks.c.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/clock.c

@@ -32,6 +32,7 @@
 #include "card.h"
 #include "helper.h"
 #include "clock.h"
+#include "quirks.h"
 
 static struct uac_clock_source_descriptor *
 	snd_usb_find_clock_source(struct usb_host_interface *ctrl_iface,
@@ -392,7 +393,9 @@ static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
 	 * interface is active. */
 	if (rate != prev_rate) {
 		usb_set_interface(dev, iface, 0);
+		snd_usb_set_interface_quirk(dev);
 		usb_set_interface(dev, iface, fmt->altsetting);
+		snd_usb_set_interface_quirk(dev);
 	}
 
 	return 0;

sound/usb/pcm.c

@@ -349,12 +349,7 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 		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);
+		snd_usb_set_interface_quirk(dev);
 	}
 
 	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,

sound/usb/quirks.c

@@ -892,6 +892,16 @@ void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
 		ep->skip_packets = 16;
 }
 
+void snd_usb_set_interface_quirk(struct usb_device *dev)
+{
+	/*
+	 * "Playback Design" products need a 50ms delay after setting the
+	 * USB interface.
+	 */
+	if (le16_to_cpu(dev->descriptor.idVendor) == 0x23ba)
+		mdelay(50);
+}
+
 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
 			   __u8 request, __u8 requesttype, __u16 value,
 			   __u16 index, void *data, __u16 size)

sound/usb/quirks.h

@@ -26,6 +26,7 @@ int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
 
 void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);
 
+void snd_usb_set_interface_quirk(struct usb_device *dev);
 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
 			   __u8 request, __u8 requesttype, __u16 value,
 			   __u16 index, void *data, __u16 size);