5 files changed, 26 insertions, 2 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 310cd6fb0038..4aaf0784940b 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -1673,6 +1673,13 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool keep_pending)
 		stop_urbs(ep, false, keep_pending);
 		if (ep->clock_ref)
 			atomic_dec(&ep->clock_ref->locked);
+
+		if (ep->chip->quirk_flags & QUIRK_FLAG_FORCE_IFACE_RESET &&
+		    usb_pipeout(ep->pipe)) {
+			ep->need_prepare = true;
+			if (ep->iface_ref)
+				ep->iface_ref->need_setup = true;
+		}
 	}
 }
 
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 8ed165f036a0..9557bd4d1bbc 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -604,6 +604,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_usb_substream *subs = runtime->private_data;
 	struct snd_usb_audio *chip = subs->stream->chip;
+	int retry = 0;
 	int ret;
 
 	ret = snd_usb_lock_shutdown(chip);
@@ -614,6 +615,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 		goto unlock;
 	}
 
+ again:
 	if (subs->sync_endpoint) {
 		ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
 		if (ret < 0)
@@ -638,9 +640,16 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 
 	subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
-	    !subs->lowlatency_playback)
+	    !subs->lowlatency_playback) {
 		ret = start_endpoints(subs);
-
+		/* if XRUN happens at starting streams (possibly with implicit
+		 * fb case), restart again, but only try once.
+		 */
+		if (ret == -EPIPE && !retry++) {
+			sync_pending_stops(subs);
+			goto again;
+		}
+	}
  unlock:
 	snd_usb_unlock_shutdown(chip);
 	return ret;
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 874fcf245747..271884e35003 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -76,6 +76,8 @@
 { USB_DEVICE_VENDOR_SPEC(0x041e, 0x3f0a) },
 /* E-Mu 0204 USB */
 { USB_DEVICE_VENDOR_SPEC(0x041e, 0x3f19) },
+/* Ktmicro Usb_audio device */
+{ USB_DEVICE_VENDOR_SPEC(0x31b2, 0x0011) },
 
 /*
  * Creative Technology, Ltd Live! Cam Sync HD [VF0770]
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 0f4dd3503a6a..58b37bfc885c 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2044,6 +2044,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 	DEVICE_FLG(0x0644, 0x804a, /* TEAC UD-301 */
 		   QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY |
 		   QUIRK_FLAG_IFACE_DELAY),
+	DEVICE_FLG(0x0644, 0x805f, /* TEAC Model 12 */
+		   QUIRK_FLAG_FORCE_IFACE_RESET),
 	DEVICE_FLG(0x06f8, 0xb000, /* Hercules DJ Console (Windows Edition) */
 		   QUIRK_FLAG_IGNORE_CTL_ERROR),
 	DEVICE_FLG(0x06f8, 0xd002, /* Hercules DJ Console (Macintosh Edition) */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index e97141ef730a..2aba508a4831 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -172,6 +172,9 @@ extern bool snd_usb_skip_validation;
  *  Don't apply implicit feedback sync mode
  * QUIRK_FLAG_IFACE_SKIP_CLOSE
  *  Don't closed interface during setting sample rate
+ * QUIRK_FLAG_FORCE_IFACE_RESET
+ *  Force an interface reset whenever stopping & restarting a stream
+ *  (e.g. after xrun)
  */
 
 #define QUIRK_FLAG_GET_SAMPLE_RATE	(1U << 0)
@@ -194,5 +197,6 @@ extern bool snd_usb_skip_validation;
 #define QUIRK_FLAG_GENERIC_IMPLICIT_FB	(1U << 17)
 #define QUIRK_FLAG_SKIP_IMPLICIT_FB	(1U << 18)
 #define QUIRK_FLAG_IFACE_SKIP_CLOSE	(1U << 19)
+#define QUIRK_FLAG_FORCE_IFACE_RESET	(1U << 20)
 
 #endif /* __USBAUDIO_H */