Update Linux to v5.4.148

Sourced from [1]

[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz

Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/sound/usb/card.c b/sound/usb/card.c
index db91dc7..c2dd18c 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -176,9 +176,8 @@
 				ctrlif, interface);
 			return -EINVAL;
 		}
-		usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
-
-		return 0;
+		return usb_driver_claim_interface(&usb_audio_driver, iface,
+						  USB_AUDIO_IFACE_UNUSED);
 	}
 
 	if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
@@ -198,7 +197,8 @@
 
 	if (! snd_usb_parse_audio_interface(chip, interface)) {
 		usb_set_interface(dev, interface, 0); /* reset the current interface */
-		usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
+		return usb_driver_claim_interface(&usb_audio_driver, iface,
+						  USB_AUDIO_IFACE_UNUSED);
 	}
 
 	return 0;
@@ -597,6 +597,10 @@
 		}
 	}
 	if (! chip) {
+		err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
+		if (err < 0)
+			goto __error;
+
 		/* it's a fresh one.
 		 * now look for an empty slot and create a new card instance
 		 */
@@ -655,10 +659,14 @@
 			goto __error;
 	}
 
-	/* we are allowed to call snd_card_register() many times */
-	err = snd_card_register(chip->card);
-	if (err < 0)
-		goto __error;
+	/* we are allowed to call snd_card_register() many times, but first
+	 * check to see if a device needs to skip it or do anything special
+	 */
+	if (!snd_usb_registration_quirk(chip, ifnum)) {
+		err = snd_card_register(chip->card);
+		if (err < 0)
+			goto __error;
+	}
 
 	if (quirk && quirk->shares_media_device) {
 		/* don't want to fail when snd_media_device_create() fails */
@@ -695,7 +703,7 @@
 	struct snd_card *card;
 	struct list_head *p;
 
-	if (chip == (void *)-1L)
+	if (chip == USB_AUDIO_IFACE_UNUSED)
 		return;
 
 	card = chip->card;
@@ -803,12 +811,9 @@
 	struct usb_mixer_interface *mixer;
 	struct list_head *p;
 
-	if (chip == (void *)-1L)
+	if (chip == USB_AUDIO_IFACE_UNUSED)
 		return 0;
 
-	chip->autosuspended = !!PMSG_IS_AUTO(message);
-	if (!chip->autosuspended)
-		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 	if (!chip->num_suspended_intf++) {
 		list_for_each_entry(as, &chip->pcm_list, list) {
 			snd_usb_pcm_suspend(as);
@@ -821,6 +826,11 @@
 			snd_usb_mixer_suspend(mixer);
 	}
 
+	if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
+		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
+		chip->system_suspend = chip->num_suspended_intf;
+	}
+
 	return 0;
 }
 
@@ -832,12 +842,12 @@
 	struct list_head *p;
 	int err = 0;
 
-	if (chip == (void *)-1L)
-		return 0;
-	if (--chip->num_suspended_intf)
+	if (chip == USB_AUDIO_IFACE_UNUSED)
 		return 0;
 
 	atomic_inc(&chip->active); /* avoid autopm */
+	if (chip->num_suspended_intf > 1)
+		goto out;
 
 	list_for_each_entry(as, &chip->pcm_list, list) {
 		err = snd_usb_pcm_resume(as);
@@ -859,9 +869,12 @@
 		snd_usbmidi_resume(p);
 	}
 
-	if (!chip->autosuspended)
+ out:
+	if (chip->num_suspended_intf == chip->system_suspend) {
 		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
-	chip->autosuspended = 0;
+		chip->system_suspend = 0;
+	}
+	chip->num_suspended_intf--;
 
 err_out:
 	atomic_dec(&chip->active); /* allow autopm after this point */
diff --git a/sound/usb/card.h b/sound/usb/card.h
index 2991b99..d8ec5ca 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -104,6 +104,7 @@
 	int iface, altsetting;
 	int skip_packets;		/* quirks for devices to ignore the first n packets
 					   in a stream */
+	bool is_implicit_feedback;      /* This endpoint is used as implicit feedback */
 
 	spinlock_t lock;
 	struct list_head list;
@@ -132,6 +133,7 @@
 	unsigned int tx_length_quirk:1;	/* add length specifier to transfers */
 	unsigned int fmt_type;		/* USB audio format type (1-3) */
 	unsigned int pkt_offset_adj;	/* Bytes to drop from beginning of packets (for non-compliant devices) */
+	unsigned int stream_offset_adj;	/* Bytes to drop from beginning of stream (for non-compliant devices) */
 
 	unsigned int running: 1;	/* running status */
 
@@ -145,6 +147,7 @@
 	struct snd_usb_endpoint *sync_endpoint;
 	unsigned long flags;
 	bool need_setup_ep;		/* (re)configure EP at prepare? */
+	bool need_setup_fmt;		/* (re)configure fmt after resume? */
 	unsigned int speed;		/* USB_SPEED_XXX */
 
 	u64 formats;			/* format bitmasks (all or'ed) */
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 6b8c14f..3d1c0ec 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -151,8 +151,71 @@
 	return ret;
 }
 
+static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
+					    struct audioformat *fmt,
+					    int source_id)
+{
+	bool ret = false;
+	int count;
+	unsigned char data;
+	struct usb_device *dev = chip->dev;
+
+	if (fmt->protocol == UAC_VERSION_2) {
+		struct uac_clock_source_descriptor *cs_desc =
+			snd_usb_find_clock_source(chip->ctrl_intf, source_id);
+
+		if (!cs_desc)
+			return false;
+
+		/*
+		 * Assume the clock is valid if clock source supports only one
+		 * single sample rate, the terminal is connected directly to it
+		 * (there is no clock selector) and clock type is internal.
+		 * This is to deal with some Denon DJ controllers that always
+		 * reports that clock is invalid.
+		 */
+		if (fmt->nr_rates == 1 &&
+		    (fmt->clock & 0xff) == cs_desc->bClockID &&
+		    (cs_desc->bmAttributes & 0x3) !=
+				UAC_CLOCK_SOURCE_TYPE_EXT)
+			return true;
+	}
+
+	/*
+	 * MOTU MicroBook IIc
+	 * Sample rate changes takes more than 2 seconds for this device. Clock
+	 * validity request returns false during that period.
+	 */
+	if (chip->usb_id == USB_ID(0x07fd, 0x0004)) {
+		count = 0;
+
+		while ((!ret) && (count < 50)) {
+			int err;
+
+			msleep(100);
+
+			err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
+					      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+					      UAC2_CS_CONTROL_CLOCK_VALID << 8,
+					      snd_usb_ctrl_intf(chip) | (source_id << 8),
+					      &data, sizeof(data));
+			if (err < 0) {
+				dev_warn(&dev->dev,
+					 "%s(): cannot get clock validity for id %d\n",
+					   __func__, source_id);
+				return false;
+			}
+
+			ret = !!data;
+			count++;
+		}
+	}
+
+	return ret;
+}
+
 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
-				      int protocol,
+				      struct audioformat *fmt,
 				      int source_id)
 {
 	int err;
@@ -160,26 +223,26 @@
 	struct usb_device *dev = chip->dev;
 	u32 bmControls;
 
-	if (protocol == UAC_VERSION_3) {
+	if (fmt->protocol == UAC_VERSION_3) {
 		struct uac3_clock_source_descriptor *cs_desc =
 			snd_usb_find_clock_source_v3(chip->ctrl_intf, source_id);
 
 		if (!cs_desc)
-			return 0;
+			return false;
 		bmControls = le32_to_cpu(cs_desc->bmControls);
 	} else { /* UAC_VERSION_1/2 */
 		struct uac_clock_source_descriptor *cs_desc =
 			snd_usb_find_clock_source(chip->ctrl_intf, source_id);
 
 		if (!cs_desc)
-			return 0;
+			return false;
 		bmControls = cs_desc->bmControls;
 	}
 
 	/* If a clock source can't tell us whether it's valid, we assume it is */
 	if (!uac_v2v3_control_is_readable(bmControls,
 				      UAC2_CS_CONTROL_CLOCK_VALID))
-		return 1;
+		return true;
 
 	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
@@ -191,13 +254,17 @@
 		dev_warn(&dev->dev,
 			 "%s(): cannot get clock validity for id %d\n",
 			   __func__, source_id);
-		return 0;
+		return false;
 	}
 
-	return !!data;
+	if (data)
+		return true;
+	else
+		return uac_clock_source_is_valid_quirk(chip, fmt, source_id);
 }
 
-static int __uac_clock_find_source(struct snd_usb_audio *chip, int entity_id,
+static int __uac_clock_find_source(struct snd_usb_audio *chip,
+				   struct audioformat *fmt, int entity_id,
 				   unsigned long *visited, bool validate)
 {
 	struct uac_clock_source_descriptor *source;
@@ -217,7 +284,7 @@
 	source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
 	if (source) {
 		entity_id = source->bClockID;
-		if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_2,
+		if (validate && !uac_clock_source_is_valid(chip, fmt,
 								entity_id)) {
 			usb_audio_err(chip,
 				"clock source %d is not valid, cannot use\n",
@@ -229,7 +296,7 @@
 
 	selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
 	if (selector) {
-		int ret, i, cur;
+		int ret, i, cur, err;
 
 		/* the entity ID we are looking for is a selector.
 		 * find out what it currently selects */
@@ -248,20 +315,32 @@
 		}
 
 		cur = ret;
-		ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
-					       visited, validate);
+		ret = __uac_clock_find_source(chip, fmt,
+					      selector->baCSourceID[ret - 1],
+					      visited, validate);
+		if (ret > 0) {
+			/*
+			 * For Samsung USBC Headset (AKG), setting clock selector again
+			 * will result in incorrect default clock setting problems
+			 */
+			if (chip->usb_id == USB_ID(0x04e8, 0xa051))
+				return ret;
+			err = uac_clock_selector_set_val(chip, entity_id, cur);
+			if (err < 0)
+				return err;
+		}
+
 		if (!validate || ret > 0 || !chip->autoclock)
 			return ret;
 
 		/* The current clock source is invalid, try others. */
 		for (i = 1; i <= selector->bNrInPins; i++) {
-			int err;
-
 			if (i == cur)
 				continue;
 
-			ret = __uac_clock_find_source(chip, selector->baCSourceID[i - 1],
-				visited, true);
+			ret = __uac_clock_find_source(chip, fmt,
+						      selector->baCSourceID[i - 1],
+						      visited, true);
 			if (ret < 0)
 				continue;
 
@@ -281,14 +360,16 @@
 	/* FIXME: multipliers only act as pass-thru element for now */
 	multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
 	if (multiplier)
-		return __uac_clock_find_source(chip, multiplier->bCSourceID,
-						visited, validate);
+		return __uac_clock_find_source(chip, fmt,
+					       multiplier->bCSourceID,
+					       visited, validate);
 
 	return -EINVAL;
 }
 
-static int __uac3_clock_find_source(struct snd_usb_audio *chip, int entity_id,
-				   unsigned long *visited, bool validate)
+static int __uac3_clock_find_source(struct snd_usb_audio *chip,
+				    struct audioformat *fmt, int entity_id,
+				    unsigned long *visited, bool validate)
 {
 	struct uac3_clock_source_descriptor *source;
 	struct uac3_clock_selector_descriptor *selector;
@@ -307,7 +388,7 @@
 	source = snd_usb_find_clock_source_v3(chip->ctrl_intf, entity_id);
 	if (source) {
 		entity_id = source->bClockID;
-		if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_3,
+		if (validate && !uac_clock_source_is_valid(chip, fmt,
 								entity_id)) {
 			usb_audio_err(chip,
 				"clock source %d is not valid, cannot use\n",
@@ -319,7 +400,7 @@
 
 	selector = snd_usb_find_clock_selector_v3(chip->ctrl_intf, entity_id);
 	if (selector) {
-		int ret, i, cur;
+		int ret, i, cur, err;
 
 		/* the entity ID we are looking for is a selector.
 		 * find out what it currently selects */
@@ -338,8 +419,15 @@
 		}
 
 		cur = ret;
-		ret = __uac3_clock_find_source(chip, selector->baCSourceID[ret - 1],
+		ret = __uac3_clock_find_source(chip, fmt,
+					       selector->baCSourceID[ret - 1],
 					       visited, validate);
+		if (ret > 0) {
+			err = uac_clock_selector_set_val(chip, entity_id, cur);
+			if (err < 0)
+				return err;
+		}
+
 		if (!validate || ret > 0 || !chip->autoclock)
 			return ret;
 
@@ -350,8 +438,9 @@
 			if (i == cur)
 				continue;
 
-			ret = __uac3_clock_find_source(chip, selector->baCSourceID[i - 1],
-				visited, true);
+			ret = __uac3_clock_find_source(chip, fmt,
+						       selector->baCSourceID[i - 1],
+						       visited, true);
 			if (ret < 0)
 				continue;
 
@@ -372,7 +461,8 @@
 	multiplier = snd_usb_find_clock_multiplier_v3(chip->ctrl_intf,
 						      entity_id);
 	if (multiplier)
-		return __uac3_clock_find_source(chip, multiplier->bCSourceID,
+		return __uac3_clock_find_source(chip, fmt,
+						multiplier->bCSourceID,
 						visited, validate);
 
 	return -EINVAL;
@@ -389,18 +479,18 @@
  *
  * Returns the clock source UnitID (>=0) on success, or an error.
  */
-int snd_usb_clock_find_source(struct snd_usb_audio *chip, int protocol,
-			      int entity_id, bool validate)
+int snd_usb_clock_find_source(struct snd_usb_audio *chip,
+			      struct audioformat *fmt, bool validate)
 {
 	DECLARE_BITMAP(visited, 256);
 	memset(visited, 0, sizeof(visited));
 
-	switch (protocol) {
+	switch (fmt->protocol) {
 	case UAC_VERSION_2:
-		return __uac_clock_find_source(chip, entity_id, visited,
+		return __uac_clock_find_source(chip, fmt, fmt->clock, visited,
 					       validate);
 	case UAC_VERSION_3:
-		return __uac3_clock_find_source(chip, entity_id, visited,
+		return __uac3_clock_find_source(chip, fmt, fmt->clock, visited,
 					       validate);
 	default:
 		return -EINVAL;
@@ -457,6 +547,12 @@
 	}
 
 	crate = data[0] | (data[1] << 8) | (data[2] << 16);
+	if (!crate) {
+		dev_info(&dev->dev, "failed to read current rate; disabling the check\n");
+		chip->sample_rate_read_error = 3; /* three strikes, see above */
+		return 0;
+	}
+
 	if (crate != rate) {
 		dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate);
 		// runtime->rate = crate;
@@ -501,8 +597,7 @@
 	 * automatic clock selection if the current clock is not
 	 * valid.
 	 */
-	clock = snd_usb_clock_find_source(chip, fmt->protocol,
-					  fmt->clock, true);
+	clock = snd_usb_clock_find_source(chip, fmt, true);
 	if (clock < 0) {
 		/* We did not find a valid clock, but that might be
 		 * because the current sample rate does not match an
@@ -510,8 +605,7 @@
 		 * and we will do another validation after setting the
 		 * rate.
 		 */
-		clock = snd_usb_clock_find_source(chip, fmt->protocol,
-						  fmt->clock, false);
+		clock = snd_usb_clock_find_source(chip, fmt, false);
 		if (clock < 0)
 			return clock;
 	}
@@ -577,7 +671,7 @@
 
 validation:
 	/* validate clock after rate change */
-	if (!uac_clock_source_is_valid(chip, fmt->protocol, clock))
+	if (!uac_clock_source_is_valid(chip, fmt, clock))
 		return -ENXIO;
 	return 0;
 }
diff --git a/sound/usb/clock.h b/sound/usb/clock.h
index 076e31b..68df0fb 100644
--- a/sound/usb/clock.h
+++ b/sound/usb/clock.h
@@ -6,7 +6,7 @@
 			     struct usb_host_interface *alts,
 			     struct audioformat *fmt, int rate);
 
-int snd_usb_clock_find_source(struct snd_usb_audio *chip, int protocol,
-			     int entity_id, bool validate);
+int snd_usb_clock_find_source(struct snd_usb_audio *chip,
+			      struct audioformat *fmt, bool validate);
 
 #endif /* __USBAUDIO_CLOCK_H */
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 4a9a2f6..87cc249 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -321,17 +321,17 @@
 			ep->next_packet_read_pos %= MAX_URBS;
 
 			/* take URB out of FIFO */
-			if (!list_empty(&ep->ready_playback_urbs))
+			if (!list_empty(&ep->ready_playback_urbs)) {
 				ctx = list_first_entry(&ep->ready_playback_urbs,
 					       struct snd_urb_ctx, ready_list);
+				list_del_init(&ctx->ready_list);
+			}
 		}
 		spin_unlock_irqrestore(&ep->lock, flags);
 
 		if (ctx == NULL)
 			return;
 
-		list_del_init(&ctx->ready_list);
-
 		/* copy over the length information */
 		for (i = 0; i < packet->packets; i++)
 			ctx->packet_size[i] = packet->packet_size[i];
@@ -497,6 +497,8 @@
 
 	list_add_tail(&ep->list, &chip->ep_list);
 
+	ep->is_implicit_feedback = 0;
+
 __exit_unlock:
 	mutex_unlock(&chip->mutex);
 
@@ -597,6 +599,178 @@
 }
 
 /*
+ * Check data endpoint for format differences
+ */
+static bool check_ep_params(struct snd_usb_endpoint *ep,
+			      snd_pcm_format_t pcm_format,
+			      unsigned int channels,
+			      unsigned int period_bytes,
+			      unsigned int frames_per_period,
+			      unsigned int periods_per_buffer,
+			      struct audioformat *fmt,
+			      struct snd_usb_endpoint *sync_ep)
+{
+	unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
+	unsigned int max_packs_per_period, urbs_per_period, urb_packs;
+	unsigned int max_urbs;
+	int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
+	int tx_length_quirk = (ep->chip->tx_length_quirk &&
+			       usb_pipeout(ep->pipe));
+	bool ret = 1;
+
+	if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
+		/*
+		 * When operating in DSD DOP mode, the size of a sample frame
+		 * in hardware differs from the actual physical format width
+		 * because we need to make room for the DOP markers.
+		 */
+		frame_bits += channels << 3;
+	}
+
+	ret = ret && (ep->datainterval == fmt->datainterval);
+	ret = ret && (ep->stride == frame_bits >> 3);
+
+	switch (pcm_format) {
+	case SNDRV_PCM_FORMAT_U8:
+		ret = ret && (ep->silence_value == 0x80);
+		break;
+	case SNDRV_PCM_FORMAT_DSD_U8:
+	case SNDRV_PCM_FORMAT_DSD_U16_LE:
+	case SNDRV_PCM_FORMAT_DSD_U32_LE:
+	case SNDRV_PCM_FORMAT_DSD_U16_BE:
+	case SNDRV_PCM_FORMAT_DSD_U32_BE:
+		ret = ret && (ep->silence_value == 0x69);
+		break;
+	default:
+		ret = ret && (ep->silence_value == 0);
+	}
+
+	/* assume max. frequency is 50% higher than nominal */
+	ret = ret && (ep->freqmax == ep->freqn + (ep->freqn >> 1));
+	/* Round up freqmax to nearest integer in order to calculate maximum
+	 * packet size, which must represent a whole number of frames.
+	 * This is accomplished by adding 0x0.ffff before converting the
+	 * Q16.16 format into integer.
+	 * In order to accurately calculate the maximum packet size when
+	 * the data interval is more than 1 (i.e. ep->datainterval > 0),
+	 * multiply by the data interval prior to rounding. For instance,
+	 * a freqmax of 41 kHz will result in a max packet size of 6 (5.125)
+	 * frames with a data interval of 1, but 11 (10.25) frames with a
+	 * data interval of 2.
+	 * (ep->freqmax << ep->datainterval overflows at 8.192 MHz for the
+	 * maximum datainterval value of 3, at USB full speed, higher for
+	 * USB high speed, noting that ep->freqmax is in units of
+	 * frames per packet in Q16.16 format.)
+	 */
+	maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) *
+			 (frame_bits >> 3);
+	if (tx_length_quirk)
+		maxsize += sizeof(__le32); /* Space for length descriptor */
+	/* but wMaxPacketSize might reduce this */
+	if (ep->maxpacksize && ep->maxpacksize < maxsize) {
+		/* whatever fits into a max. size packet */
+		unsigned int data_maxsize = maxsize = ep->maxpacksize;
+
+		if (tx_length_quirk)
+			/* Need to remove the length descriptor to calc freq */
+			data_maxsize -= sizeof(__le32);
+		ret = ret && (ep->freqmax == (data_maxsize / (frame_bits >> 3))
+				<< (16 - ep->datainterval));
+	}
+
+	if (ep->fill_max)
+		ret = ret && (ep->curpacksize == ep->maxpacksize);
+	else
+		ret = ret && (ep->curpacksize == maxsize);
+
+	if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
+		packs_per_ms = 8 >> ep->datainterval;
+		max_packs_per_urb = MAX_PACKS_HS;
+	} else {
+		packs_per_ms = 1;
+		max_packs_per_urb = MAX_PACKS;
+	}
+	if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
+		max_packs_per_urb = min(max_packs_per_urb,
+					1U << sync_ep->syncinterval);
+	max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
+
+	/*
+	 * Capture endpoints need to use small URBs because there's no way
+	 * to tell in advance where the next period will end, and we don't
+	 * want the next URB to complete much after the period ends.
+	 *
+	 * Playback endpoints with implicit sync much use the same parameters
+	 * as their corresponding capture endpoint.
+	 */
+	if (usb_pipein(ep->pipe) ||
+			snd_usb_endpoint_implicit_feedback_sink(ep)) {
+
+		urb_packs = packs_per_ms;
+		/*
+		 * Wireless devices can poll at a max rate of once per 4ms.
+		 * For dataintervals less than 5, increase the packet count to
+		 * allow the host controller to use bursting to fill in the
+		 * gaps.
+		 */
+		if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
+			int interval = ep->datainterval;
+
+			while (interval < 5) {
+				urb_packs <<= 1;
+				++interval;
+			}
+		}
+		/* make capture URBs <= 1 ms and smaller than a period */
+		urb_packs = min(max_packs_per_urb, urb_packs);
+		while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
+			urb_packs >>= 1;
+		ret = ret && (ep->nurbs == MAX_URBS);
+
+	/*
+	 * Playback endpoints without implicit sync are adjusted so that
+	 * a period fits as evenly as possible in the smallest number of
+	 * URBs.  The total number of URBs is adjusted to the size of the
+	 * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits.
+	 */
+	} else {
+		/* determine how small a packet can be */
+		minsize = (ep->freqn >> (16 - ep->datainterval)) *
+				(frame_bits >> 3);
+		/* with sync from device, assume it can be 12% lower */
+		if (sync_ep)
+			minsize -= minsize >> 3;
+		minsize = max(minsize, 1u);
+
+		/* how many packets will contain an entire ALSA period? */
+		max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
+
+		/* how many URBs will contain a period? */
+		urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
+				max_packs_per_urb);
+		/* how many packets are needed in each URB? */
+		urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
+
+		/* limit the number of frames in a single URB */
+		ret = ret && (ep->max_urb_frames ==
+			DIV_ROUND_UP(frames_per_period, urbs_per_period));
+
+		/* try to use enough URBs to contain an entire ALSA buffer */
+		max_urbs = min((unsigned) MAX_URBS,
+				MAX_QUEUE * packs_per_ms / urb_packs);
+		ret = ret && (ep->nurbs == min(max_urbs,
+				urbs_per_period * periods_per_buffer));
+	}
+
+	ret = ret && (ep->datainterval == fmt->datainterval);
+	ret = ret && (ep->maxpacksize == fmt->maxpacksize);
+	ret = ret &&
+		(ep->fill_max == !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX));
+
+	return ret;
+}
+
+/*
  * configure a data endpoint
  */
 static int data_ep_set_params(struct snd_usb_endpoint *ep,
@@ -861,10 +1035,23 @@
 	int err;
 
 	if (ep->use_count != 0) {
-		usb_audio_warn(ep->chip,
-			 "Unable to change format on ep #%x: already in use\n",
-			 ep->ep_num);
-		return -EBUSY;
+		bool check = ep->is_implicit_feedback &&
+			check_ep_params(ep, pcm_format,
+					     channels, period_bytes,
+					     period_frames, buffer_periods,
+					     fmt, sync_ep);
+
+		if (!check) {
+			usb_audio_warn(ep->chip,
+				"Unable to change format on ep #%x: already in use\n",
+				ep->ep_num);
+			return -EBUSY;
+		}
+
+		usb_audio_dbg(ep->chip,
+			      "Ep #%x already in use as implicit feedback but format not changed\n",
+			      ep->ep_num);
+		return 0;
 	}
 
 	/* release old buffers, if any */
diff --git a/sound/usb/format.c b/sound/usb/format.c
index d79db71..84b66f7 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -40,6 +40,8 @@
 	case UAC_VERSION_1:
 	default: {
 		struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
+		if (format >= 64)
+			return 0; /* invalid format */
 		sample_width = fmt->bBitResolution;
 		sample_bytes = fmt->bSubframeSize;
 		format = 1ULL << format;
@@ -193,9 +195,11 @@
 				continue;
 			/* C-Media CM6501 mislabels its 96 kHz altsetting */
 			/* Terratec Aureon 7.1 USB C-Media 6206, too */
+			/* Ozone Z90 USB C-Media, too */
 			if (rate == 48000 && nr_rates == 1 &&
 			    (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
 			     chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
+			     chip->usb_id == USB_ID(0x0d8c, 0x0078) ||
 			     chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
 			    fp->altsetting == 5 && fp->maxpacksize == 392)
 				rate = 96000;
@@ -227,6 +231,52 @@
 }
 
 /*
+ * Many Focusrite devices supports a limited set of sampling rates per
+ * altsetting. Maximum rate is exposed in the last 4 bytes of Format Type
+ * descriptor which has a non-standard bLength = 10.
+ */
+static bool focusrite_valid_sample_rate(struct snd_usb_audio *chip,
+					struct audioformat *fp,
+					unsigned int rate)
+{
+	struct usb_interface *iface;
+	struct usb_host_interface *alts;
+	unsigned char *fmt;
+	unsigned int max_rate;
+
+	iface = usb_ifnum_to_if(chip->dev, fp->iface);
+	if (!iface)
+		return true;
+
+	alts = &iface->altsetting[fp->altset_idx];
+	fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
+				      NULL, UAC_FORMAT_TYPE);
+	if (!fmt)
+		return true;
+
+	if (fmt[0] == 10) { /* bLength */
+		max_rate = combine_quad(&fmt[6]);
+
+		/* Validate max rate */
+		if (max_rate != 48000 &&
+		    max_rate != 96000 &&
+		    max_rate != 192000 &&
+		    max_rate != 384000) {
+
+			usb_audio_info(chip,
+				"%u:%d : unexpected max rate: %u\n",
+				fp->iface, fp->altsetting, max_rate);
+
+			return true;
+		}
+
+		return rate <= max_rate;
+	}
+
+	return true;
+}
+
+/*
  * Helper function to walk the array of sample rate triplets reported by
  * the device. The problem is that we need to parse whole array first to
  * get to know how many sample rates we have to expect.
@@ -262,6 +312,11 @@
 		}
 
 		for (rate = min; rate <= max; rate += res) {
+			/* Filter out invalid rates on Focusrite devices */
+			if (USB_ID_VENDOR(chip->usb_id) == 0x1235 &&
+			    !focusrite_valid_sample_rate(chip, fp, rate))
+				goto skip_rate;
+
 			if (fp->rate_table)
 				fp->rate_table[nr_rates] = rate;
 			if (!fp->rate_min || rate < fp->rate_min)
@@ -276,6 +331,7 @@
 				break;
 			}
 
+skip_rate:
 			/* avoid endless loop */
 			if (res == 0)
 				break;
@@ -296,6 +352,9 @@
 	case USB_ID(0x0E41, 0x4242): /* Line6 Helix Rack */
 	case USB_ID(0x0E41, 0x4244): /* Line6 Helix LT */
 	case USB_ID(0x0E41, 0x4246): /* Line6 HX-Stomp */
+	case USB_ID(0x0E41, 0x4248): /* Line6 Helix >= fw 2.82 */
+	case USB_ID(0x0E41, 0x4249): /* Line6 Helix Rack >= fw 2.82 */
+	case USB_ID(0x0E41, 0x424a): /* Line6 Helix LT >= fw 2.82 */
 		/* supported rates: 48Khz */
 		kfree(fp->rate_table);
 		fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
@@ -322,8 +381,7 @@
 	struct usb_device *dev = chip->dev;
 	unsigned char tmp[2], *data;
 	int nr_triplets, data_size, ret = 0, ret_l6;
-	int clock = snd_usb_clock_find_source(chip, fp->protocol,
-					      fp->clock, false);
+	int clock = snd_usb_clock_find_source(chip, fp, false);
 
 	if (clock < 0) {
 		dev_err(&dev->dev,
diff --git a/sound/usb/line6/capture.c b/sound/usb/line6/capture.c
index 82abef3..4b6e99e 100644
--- a/sound/usb/line6/capture.c
+++ b/sound/usb/line6/capture.c
@@ -287,6 +287,8 @@
 		urb->interval = LINE6_ISO_INTERVAL;
 		urb->error_count = 0;
 		urb->complete = audio_in_callback;
+		if (usb_urb_ep_type_check(urb))
+			return -EINVAL;
 	}
 
 	return 0;
diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index b5a3f75..1e38cdd 100644
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -305,7 +305,7 @@
 				line6_midibuf_read(mb, line6->buffer_message,
 						LINE6_MIDI_MESSAGE_MAXLEN);
 
-			if (done == 0)
+			if (done <= 0)
 				break;
 
 			line6->message_length = done;
@@ -690,6 +690,10 @@
 		line6->buffer_message = kmalloc(LINE6_MIDI_MESSAGE_MAXLEN, GFP_KERNEL);
 		if (!line6->buffer_message)
 			return -ENOMEM;
+
+		ret = line6_init_midi(line6);
+		if (ret < 0)
+			return ret;
 	} else {
 		ret = line6_hwdep_init(line6);
 		if (ret < 0)
@@ -820,7 +824,7 @@
 	if (WARN_ON(usbdev != line6->usbdev))
 		return;
 
-	cancel_delayed_work(&line6->startup_work);
+	cancel_delayed_work_sync(&line6->startup_work);
 
 	if (line6->urb_listen != NULL)
 		line6_stop_listen(line6);
diff --git a/sound/usb/line6/midibuf.c b/sound/usb/line6/midibuf.c
index 8d6eefa..6a70463 100644
--- a/sound/usb/line6/midibuf.c
+++ b/sound/usb/line6/midibuf.c
@@ -159,7 +159,7 @@
 			int midi_length_prev =
 			    midibuf_message_length(this->command_prev);
 
-			if (midi_length_prev > 0) {
+			if (midi_length_prev > 1) {
 				midi_length = midi_length_prev - 1;
 				repeat = 1;
 			} else
diff --git a/sound/usb/line6/playback.c b/sound/usb/line6/playback.c
index 2e8ead3..797ced3 100644
--- a/sound/usb/line6/playback.c
+++ b/sound/usb/line6/playback.c
@@ -432,6 +432,8 @@
 		urb->interval = LINE6_ISO_INTERVAL;
 		urb->error_count = 0;
 		urb->complete = audio_out_callback;
+		if (usb_urb_ep_type_check(urb))
+			return -EINVAL;
 	}
 
 	return 0;
diff --git a/sound/usb/line6/pod.c b/sound/usb/line6/pod.c
index ee4c9d2..b667bb8 100644
--- a/sound/usb/line6/pod.c
+++ b/sound/usb/line6/pod.c
@@ -376,11 +376,6 @@
 	if (err < 0)
 		return err;
 
-	/* initialize MIDI subsystem: */
-	err = line6_init_midi(line6);
-	if (err < 0)
-		return err;
-
 	/* initialize PCM subsystem: */
 	err = line6_init_pcm(line6, &pod_pcm_properties);
 	if (err < 0)
diff --git a/sound/usb/line6/podhd.c b/sound/usb/line6/podhd.c
index 27bf61c..5d9954a 100644
--- a/sound/usb/line6/podhd.c
+++ b/sound/usb/line6/podhd.c
@@ -21,8 +21,7 @@
 enum {
 	LINE6_PODHD300,
 	LINE6_PODHD400,
-	LINE6_PODHD500_0,
-	LINE6_PODHD500_1,
+	LINE6_PODHD500,
 	LINE6_PODX3,
 	LINE6_PODX3LIVE,
 	LINE6_PODHD500X,
@@ -318,8 +317,7 @@
 	/* TODO: no need to alloc data interfaces when only audio is used */
 	{ LINE6_DEVICE(0x5057),    .driver_info = LINE6_PODHD300 },
 	{ LINE6_DEVICE(0x5058),    .driver_info = LINE6_PODHD400 },
-	{ LINE6_IF_NUM(0x414D, 0), .driver_info = LINE6_PODHD500_0 },
-	{ LINE6_IF_NUM(0x414D, 1), .driver_info = LINE6_PODHD500_1 },
+	{ LINE6_IF_NUM(0x414D, 0), .driver_info = LINE6_PODHD500 },
 	{ LINE6_IF_NUM(0x414A, 0), .driver_info = LINE6_PODX3 },
 	{ LINE6_IF_NUM(0x414B, 0), .driver_info = LINE6_PODX3LIVE },
 	{ LINE6_IF_NUM(0x4159, 0), .driver_info = LINE6_PODHD500X },
@@ -352,23 +350,13 @@
 		.ep_audio_r = 0x82,
 		.ep_audio_w = 0x01,
 	},
-	[LINE6_PODHD500_0] = {
+	[LINE6_PODHD500] = {
 		.id = "PODHD500",
 		.name = "POD HD500",
-		.capabilities	= LINE6_CAP_PCM
+		.capabilities	= LINE6_CAP_PCM | LINE6_CAP_CONTROL
 				| LINE6_CAP_HWMON,
 		.altsetting = 1,
-		.ep_ctrl_r = 0x81,
-		.ep_ctrl_w = 0x01,
-		.ep_audio_r = 0x86,
-		.ep_audio_w = 0x02,
-	},
-	[LINE6_PODHD500_1] = {
-		.id = "PODHD500",
-		.name = "POD HD500",
-		.capabilities	= LINE6_CAP_PCM
-				| LINE6_CAP_HWMON,
-		.altsetting = 0,
+		.ctrl_if = 1,
 		.ep_ctrl_r = 0x81,
 		.ep_ctrl_w = 0x01,
 		.ep_audio_r = 0x86,
diff --git a/sound/usb/line6/variax.c b/sound/usb/line6/variax.c
index ed158f0..c2245aa 100644
--- a/sound/usb/line6/variax.c
+++ b/sound/usb/line6/variax.c
@@ -159,7 +159,6 @@
 		       const struct usb_device_id *id)
 {
 	struct usb_line6_variax *variax = line6_to_variax(line6);
-	int err;
 
 	line6->process_message = line6_variax_process_message;
 	line6->disconnect = line6_variax_disconnect;
@@ -172,11 +171,6 @@
 	if (variax->buffer_activate == NULL)
 		return -ENOMEM;
 
-	/* initialize MIDI subsystem: */
-	err = line6_init_midi(&variax->line6);
-	if (err < 0)
-		return err;
-
 	/* initiate startup procedure: */
 	schedule_delayed_work(&line6->startup_work,
 			      msecs_to_jiffies(VARIAX_STARTUP_DELAY1));
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index b737f0e..33e9a7f 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -1332,7 +1332,7 @@
 
  error:
 	snd_usbmidi_in_endpoint_delete(ep);
-	return -ENOMEM;
+	return err;
 }
 
 /*
@@ -1499,6 +1499,8 @@
 	spin_unlock_irq(&umidi->disc_lock);
 	up_write(&umidi->disc_rwsem);
 
+	del_timer_sync(&umidi->error_timer);
+
 	for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
 		struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
 		if (ep->out)
@@ -1525,7 +1527,6 @@
 			ep->in = NULL;
 		}
 	}
-	del_timer_sync(&umidi->error_timer);
 }
 EXPORT_SYMBOL(snd_usbmidi_disconnect);
 
@@ -1826,6 +1827,28 @@
 	return 0;
 }
 
+static struct usb_ms_endpoint_descriptor *find_usb_ms_endpoint_descriptor(
+					struct usb_host_endpoint *hostep)
+{
+	unsigned char *extra = hostep->extra;
+	int extralen = hostep->extralen;
+
+	while (extralen > 3) {
+		struct usb_ms_endpoint_descriptor *ms_ep =
+				(struct usb_ms_endpoint_descriptor *)extra;
+
+		if (ms_ep->bLength > 3 &&
+		    ms_ep->bDescriptorType == USB_DT_CS_ENDPOINT &&
+		    ms_ep->bDescriptorSubtype == UAC_MS_GENERAL)
+			return ms_ep;
+		if (!extra[0])
+			break;
+		extralen -= extra[0];
+		extra += extra[0];
+	}
+	return NULL;
+}
+
 /*
  * Returns MIDIStreaming device capabilities.
  */
@@ -1863,11 +1886,14 @@
 		ep = get_ep_desc(hostep);
 		if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
 			continue;
-		ms_ep = (struct usb_ms_endpoint_descriptor *)hostep->extra;
-		if (hostep->extralen < 4 ||
-		    ms_ep->bLength < 4 ||
-		    ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
-		    ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
+		ms_ep = find_usb_ms_endpoint_descriptor(hostep);
+		if (!ms_ep)
+			continue;
+		if (ms_ep->bLength <= sizeof(*ms_ep))
+			continue;
+		if (ms_ep->bNumEmbMIDIJack > 0x10)
+			continue;
+		if (ms_ep->bLength < sizeof(*ms_ep) + ms_ep->bNumEmbMIDIJack)
 			continue;
 		if (usb_endpoint_dir_out(ep)) {
 			if (endpoints[epidx].out_ep) {
@@ -2121,6 +2147,8 @@
 		    cs_desc[1] == USB_DT_CS_INTERFACE &&
 		    cs_desc[2] == 0xf1 &&
 		    cs_desc[3] == 0x02) {
+			if (cs_desc[4] > 0x10 || cs_desc[5] > 0x10)
+				continue;
 			endpoint->in_cables  = (1 << cs_desc[4]) - 1;
 			endpoint->out_cables = (1 << cs_desc[5]) - 1;
 			return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
@@ -2282,16 +2310,22 @@
 }
 EXPORT_SYMBOL(snd_usbmidi_input_stop);
 
-static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint *ep)
+static void snd_usbmidi_input_start_ep(struct snd_usb_midi *umidi,
+				       struct snd_usb_midi_in_endpoint *ep)
 {
 	unsigned int i;
+	unsigned long flags;
 
 	if (!ep)
 		return;
 	for (i = 0; i < INPUT_URBS; ++i) {
 		struct urb *urb = ep->urbs[i];
-		urb->dev = ep->umidi->dev;
-		snd_usbmidi_submit_urb(urb, GFP_KERNEL);
+		spin_lock_irqsave(&umidi->disc_lock, flags);
+		if (!atomic_read(&urb->use_count)) {
+			urb->dev = ep->umidi->dev;
+			snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
+		}
+		spin_unlock_irqrestore(&umidi->disc_lock, flags);
 	}
 }
 
@@ -2307,7 +2341,7 @@
 	if (umidi->input_running || !umidi->opened[1])
 		return;
 	for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
-		snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
+		snd_usbmidi_input_start_ep(umidi, umidi->endpoints[i].in);
 	umidi->input_running = 1;
 }
 EXPORT_SYMBOL(snd_usbmidi_input_start);
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 6cd4ff0..67eb129 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -576,8 +576,9 @@
  * if failed, give up and free the control instance.
  */
 
-int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
-			      struct snd_kcontrol *kctl)
+int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
+			   struct snd_kcontrol *kctl,
+			   bool is_std_info)
 {
 	struct usb_mixer_interface *mixer = list->mixer;
 	int err;
@@ -591,6 +592,7 @@
 		return err;
 	}
 	list->kctl = kctl;
+	list->is_std_info = is_std_info;
 	list->next_id_elem = mixer->id_elems[list->id];
 	mixer->id_elems[list->id] = list;
 	return 0;
@@ -897,6 +899,15 @@
 	return 0;
 }
 
+static int parse_term_effect_unit(struct mixer_build *state,
+				  struct usb_audio_term *term,
+				  void *p1, int id)
+{
+	term->type = UAC3_EFFECT_UNIT << 16; /* virtual type */
+	term->id = id;
+	return 0;
+}
+
 static int parse_term_uac2_clock_source(struct mixer_build *state,
 					struct usb_audio_term *term,
 					void *p1, int id)
@@ -981,8 +992,7 @@
 						    UAC3_PROCESSING_UNIT);
 		case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
 		case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
-			return parse_term_proc_unit(state, term, p1, id,
-						    UAC3_EFFECT_UNIT);
+			return parse_term_effect_unit(state, term, p1, id);
 		case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
 		case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
 		case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
@@ -1020,7 +1030,7 @@
 	int type_uac2;	/* data type for uac2 if different from uac1, else -1 */
 };
 
-static struct usb_feature_control_info audio_feature_info[] = {
+static const struct usb_feature_control_info audio_feature_info[] = {
 	{ UAC_FU_MUTE,			"Mute",			USB_MIXER_INV_BOOLEAN, -1 },
 	{ UAC_FU_VOLUME,		"Volume",		USB_MIXER_S16, -1 },
 	{ UAC_FU_BASS,			"Tone Control - Bass",	USB_MIXER_S8, -1 },
@@ -1163,6 +1173,14 @@
 			cval->res = 384;
 		}
 		break;
+	case USB_ID(0x0495, 0x3042): /* ESS Technology Asus USB DAC */
+		if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
+			strstr(kctl->id.name, "Capture Volume") != NULL) {
+			cval->min >>= 8;
+			cval->max = 0;
+			cval->res = 1;
+		}
+		break;
 	}
 }
 
@@ -1438,7 +1456,7 @@
 		usb_audio_err(chip,
 			"cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 			UAC_GET_CUR, validx, idx, cval->val_type);
-		return ret;
+		return filter_error(cval, ret);
 	}
 
 	ucontrol->value.integer.value[0] = val;
@@ -1526,7 +1544,7 @@
 	strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
 }
 
-static struct usb_feature_control_info *get_feature_control_info(int control)
+static const struct usb_feature_control_info *get_feature_control_info(int control)
 {
 	int i;
 
@@ -1544,7 +1562,7 @@
 				struct usb_audio_term *oterm,
 				int unitid, int nameid, int readonly_mask)
 {
-	struct usb_feature_control_info *ctl_info;
+	const struct usb_feature_control_info *ctl_info;
 	unsigned int len = 0;
 	int mapped_name = 0;
 	struct snd_kcontrol *kctl;
@@ -1666,6 +1684,16 @@
 	/* get min/max values */
 	get_min_max_with_quirks(cval, 0, kctl);
 
+	/* skip a bogus volume range */
+	if (cval->max <= cval->min) {
+		usb_audio_dbg(mixer->chip,
+			      "[%d] FU [%s] skipped due to invalid volume\n",
+			      cval->head.id, kctl->id.name);
+		snd_ctl_free_one(kctl);
+		return;
+	}
+
+
 	if (control == UAC_FU_VOLUME) {
 		check_mapped_dB(map, cval);
 		if (cval->dBmin < cval->dBmax || !cval->initialized) {
@@ -1742,10 +1770,16 @@
 
 /* Build a mixer control for a UAC connector control (jack-detect) */
 static void build_connector_control(struct usb_mixer_interface *mixer,
+				    const struct usbmix_name_map *imap,
 				    struct usb_audio_term *term, bool is_input)
 {
 	struct snd_kcontrol *kctl;
 	struct usb_mixer_elem_info *cval;
+	const struct usbmix_name_map *map;
+
+	map = find_map(imap, term->id, 0);
+	if (check_ignored_ctl(map))
+		return;
 
 	cval = kzalloc(sizeof(*cval), GFP_KERNEL);
 	if (!cval)
@@ -1776,8 +1810,12 @@
 		usb_mixer_elem_info_free(cval);
 		return;
 	}
-	get_connector_control_name(mixer, term, is_input, kctl->id.name,
-				   sizeof(kctl->id.name));
+
+	if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name)))
+		strlcat(kctl->id.name, " Jack", sizeof(kctl->id.name));
+	else
+		get_connector_control_name(mixer, term, is_input, kctl->id.name,
+					   sizeof(kctl->id.name));
 	kctl->private_free = snd_usb_mixer_elem_free;
 	snd_usb_mixer_add_control(&cval->head, kctl);
 }
@@ -2080,8 +2118,9 @@
 	check_input_term(state, term_id, &iterm);
 
 	/* Check for jack detection. */
-	if (uac_v2v3_control_is_readable(bmctls, control))
-		build_connector_control(state->mixer, &iterm, true);
+	if ((iterm.type & 0xff00) != 0x0100 &&
+	    uac_v2v3_control_is_readable(bmctls, control))
+		build_connector_control(state->mixer, state->map, &iterm, true);
 
 	return 0;
 }
@@ -2198,7 +2237,7 @@
  */
 struct procunit_value_info {
 	int control;
-	char *suffix;
+	const char *suffix;
 	int val_type;
 	int min_value;
 };
@@ -2206,44 +2245,44 @@
 struct procunit_info {
 	int type;
 	char *name;
-	struct procunit_value_info *values;
+	const struct procunit_value_info *values;
 };
 
-static struct procunit_value_info undefined_proc_info[] = {
+static const struct procunit_value_info undefined_proc_info[] = {
 	{ 0x00, "Control Undefined", 0 },
 	{ 0 }
 };
 
-static struct procunit_value_info updown_proc_info[] = {
+static const struct procunit_value_info updown_proc_info[] = {
 	{ UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
 	{ UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
 	{ 0 }
 };
-static struct procunit_value_info prologic_proc_info[] = {
+static const struct procunit_value_info prologic_proc_info[] = {
 	{ UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
 	{ UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
 	{ 0 }
 };
-static struct procunit_value_info threed_enh_proc_info[] = {
+static const struct procunit_value_info threed_enh_proc_info[] = {
 	{ UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
 	{ UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
 	{ 0 }
 };
-static struct procunit_value_info reverb_proc_info[] = {
+static const struct procunit_value_info reverb_proc_info[] = {
 	{ UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
 	{ UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
 	{ UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
 	{ UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
 	{ 0 }
 };
-static struct procunit_value_info chorus_proc_info[] = {
+static const struct procunit_value_info chorus_proc_info[] = {
 	{ UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
 	{ UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
 	{ UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
 	{ UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
 	{ 0 }
 };
-static struct procunit_value_info dcr_proc_info[] = {
+static const struct procunit_value_info dcr_proc_info[] = {
 	{ UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
 	{ UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
 	{ UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
@@ -2253,7 +2292,7 @@
 	{ 0 }
 };
 
-static struct procunit_info procunits[] = {
+static const struct procunit_info procunits[] = {
 	{ UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
 	{ UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
 	{ UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
@@ -2263,16 +2302,16 @@
 	{ 0 },
 };
 
-static struct procunit_value_info uac3_updown_proc_info[] = {
+static const struct procunit_value_info uac3_updown_proc_info[] = {
 	{ UAC3_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
 	{ 0 }
 };
-static struct procunit_value_info uac3_stereo_ext_proc_info[] = {
+static const struct procunit_value_info uac3_stereo_ext_proc_info[] = {
 	{ UAC3_EXT_WIDTH_CONTROL, "Width Control", USB_MIXER_U8 },
 	{ 0 }
 };
 
-static struct procunit_info uac3_procunits[] = {
+static const struct procunit_info uac3_procunits[] = {
 	{ UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
 	{ UAC3_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", uac3_stereo_ext_proc_info },
 	{ UAC3_PROCESS_MULTI_FUNCTION, "Multi-Function", undefined_proc_info },
@@ -2282,23 +2321,23 @@
 /*
  * predefined data for extension units
  */
-static struct procunit_value_info clock_rate_xu_info[] = {
+static const struct procunit_value_info clock_rate_xu_info[] = {
 	{ USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
 	{ 0 }
 };
-static struct procunit_value_info clock_source_xu_info[] = {
+static const struct procunit_value_info clock_source_xu_info[] = {
 	{ USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
 	{ 0 }
 };
-static struct procunit_value_info spdif_format_xu_info[] = {
+static const struct procunit_value_info spdif_format_xu_info[] = {
 	{ USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
 	{ 0 }
 };
-static struct procunit_value_info soft_limit_xu_info[] = {
+static const struct procunit_value_info soft_limit_xu_info[] = {
 	{ USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
 	{ 0 }
 };
-static struct procunit_info extunits[] = {
+static const struct procunit_info extunits[] = {
 	{ USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
 	{ USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
 	{ USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
@@ -2310,7 +2349,7 @@
  * build a processing/extension unit
  */
 static int build_audio_procunit(struct mixer_build *state, int unitid,
-				void *raw_desc, struct procunit_info *list,
+				void *raw_desc, const struct procunit_info *list,
 				bool extension_unit)
 {
 	struct uac_processing_unit_descriptor *desc = raw_desc;
@@ -2318,14 +2357,14 @@
 	struct usb_mixer_elem_info *cval;
 	struct snd_kcontrol *kctl;
 	int i, err, nameid, type, len;
-	struct procunit_info *info;
-	struct procunit_value_info *valinfo;
+	const struct procunit_info *info;
+	const struct procunit_value_info *valinfo;
 	const struct usbmix_name_map *map;
-	static struct procunit_value_info default_value_info[] = {
+	static const struct procunit_value_info default_value_info[] = {
 		{ 0x01, "Switch", USB_MIXER_BOOLEAN },
 		{ 0 }
 	};
-	static struct procunit_info default_info = {
+	static const struct procunit_info default_info = {
 		0, NULL, default_value_info
 	};
 	const char *name = extension_unit ?
@@ -2803,7 +2842,7 @@
 	int st_chmask;	/* side tone mixing channel mask */
 };
 
-static struct uac3_badd_profile uac3_badd_profiles[] = {
+static const struct uac3_badd_profile uac3_badd_profiles[] = {
 	{
 		/*
 		 * BAIF, BAOF or combination of both
@@ -2864,7 +2903,7 @@
 };
 
 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
-					      struct uac3_badd_profile *f,
+					      const struct uac3_badd_profile *f,
 					      int c_chmask, int p_chmask)
 {
 	/*
@@ -2908,7 +2947,7 @@
 	struct usb_device *dev = mixer->chip->dev;
 	struct usb_interface_assoc_descriptor *assoc;
 	int badd_profile = mixer->chip->badd_profile;
-	struct uac3_badd_profile *f;
+	const struct uac3_badd_profile *f;
 	const struct usbmix_ctl_map *map;
 	int p_chmask = 0, c_chmask = 0, st_chmask = 0;
 	int i;
@@ -3042,13 +3081,13 @@
 		memset(&iterm, 0, sizeof(iterm));
 		iterm.id = UAC3_BADD_IT_ID4;
 		iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
-		build_connector_control(mixer, &iterm, true);
+		build_connector_control(mixer, map->map, &iterm, true);
 
 		/* Output Term - Insertion control */
 		memset(&oterm, 0, sizeof(oterm));
 		oterm.id = UAC3_BADD_OT_ID3;
 		oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
-		build_connector_control(mixer, &oterm, false);
+		build_connector_control(mixer, map->map, &oterm, false);
 	}
 
 	return 0;
@@ -3077,7 +3116,8 @@
 		if (map->id == state.chip->usb_id) {
 			state.map = map->map;
 			state.selector_map = map->selector_map;
-			mixer->ignore_ctl_error = map->ignore_ctl_error;
+			mixer->connector_map = map->connector_map;
+			mixer->ignore_ctl_error |= map->ignore_ctl_error;
 			break;
 		}
 	}
@@ -3120,10 +3160,11 @@
 			if (err < 0 && err != -EINVAL)
 				return err;
 
-			if (uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
+			if ((state.oterm.type & 0xff00) != 0x0100 &&
+			    uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
 							 UAC2_TE_CONNECTOR)) {
-				build_connector_control(state.mixer, &state.oterm,
-							false);
+				build_connector_control(state.mixer, state.map,
+							&state.oterm, false);
 			}
 		} else {  /* UAC_VERSION_3 */
 			struct uac3_output_terminal_descriptor *desc = p;
@@ -3145,10 +3186,11 @@
 			if (err < 0 && err != -EINVAL)
 				return err;
 
-			if (uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
+			if ((state.oterm.type & 0xff00) != 0x0100 &&
+			    uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
 							 UAC3_TE_INSERTION)) {
-				build_connector_control(state.mixer, &state.oterm,
-							false);
+				build_connector_control(state.mixer, state.map,
+							&state.oterm, false);
 			}
 		}
 	}
@@ -3156,13 +3198,38 @@
 	return 0;
 }
 
+static int delegate_notify(struct usb_mixer_interface *mixer, int unitid,
+			   u8 *control, u8 *channel)
+{
+	const struct usbmix_connector_map *map = mixer->connector_map;
+
+	if (!map)
+		return unitid;
+
+	for (; map->id; map++) {
+		if (map->id == unitid) {
+			if (control && map->control)
+				*control = map->control;
+			if (channel && map->channel)
+				*channel = map->channel;
+			return map->delegated_id;
+		}
+	}
+	return unitid;
+}
+
 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
 {
 	struct usb_mixer_elem_list *list;
 
+	unitid = delegate_notify(mixer, unitid, NULL, NULL);
+
 	for_each_mixer_elem(list, mixer, unitid) {
-		struct usb_mixer_elem_info *info =
-			mixer_elem_list_to_info(list);
+		struct usb_mixer_elem_info *info;
+
+		if (!list->is_std_info)
+			continue;
+		info = mixer_elem_list_to_info(list);
 		/* invalidate cache, so the value is read from the device */
 		info->cached = 0;
 		snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
@@ -3174,8 +3241,17 @@
 				    struct usb_mixer_elem_list *list)
 {
 	struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
-	static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
-				    "S8", "U8", "S16", "U16"};
+	static const char * const val_types[] = {
+		[USB_MIXER_BOOLEAN] = "BOOLEAN",
+		[USB_MIXER_INV_BOOLEAN] = "INV_BOOLEAN",
+		[USB_MIXER_S8] = "S8",
+		[USB_MIXER_U8] = "U8",
+		[USB_MIXER_S16] = "S16",
+		[USB_MIXER_U16] = "U16",
+		[USB_MIXER_S32] = "S32",
+		[USB_MIXER_U32] = "U32",
+		[USB_MIXER_BESPOKEN] = "BESPOKEN",
+	};
 	snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
 			    "channels=%i, type=\"%s\"\n", cval->head.id,
 			    cval->control, cval->cmask, cval->channels,
@@ -3229,6 +3305,8 @@
 		return;
 	}
 
+	unitid = delegate_notify(mixer, unitid, &control, &channel);
+
 	for_each_mixer_elem(list, mixer, unitid)
 		count++;
 
@@ -3240,6 +3318,8 @@
 
 		if (!list->kctl)
 			continue;
+		if (!list->is_std_info)
+			continue;
 
 		info = mixer_elem_list_to_info(list);
 		if (count > 1 && info->control != control)
@@ -3527,6 +3607,9 @@
 	struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
 	int c, err, idx;
 
+	if (cval->val_type == USB_MIXER_BESPOKEN)
+		return 0;
+
 	if (cval->cmask) {
 		idx = 0;
 		for (c = 0; c < MAX_CHANNELS; c++) {
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index 37e1b23..0e813cd 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -6,6 +6,13 @@
 
 struct media_mixer_ctl;
 
+struct usbmix_connector_map {
+	u8 id;
+	u8 delegated_id;
+	u8 control;
+	u8 channel;
+};
+
 struct usb_mixer_interface {
 	struct snd_usb_audio *chip;
 	struct usb_host_interface *hostif;
@@ -18,6 +25,9 @@
 	/* the usb audio specification version this interface complies to */
 	int protocol;
 
+	/* optional connector delegation map */
+	const struct usbmix_connector_map *connector_map;
+
 	/* Sound Blaster remote control stuff */
 	const struct rc_config *rc_cfg;
 	u32 rc_code;
@@ -45,6 +55,7 @@
 	USB_MIXER_U16,
 	USB_MIXER_S32,
 	USB_MIXER_U32,
+	USB_MIXER_BESPOKEN,	/* non-standard type */
 };
 
 typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,
@@ -56,6 +67,7 @@
 	struct usb_mixer_elem_list *next_id_elem; /* list of controls with same id */
 	struct snd_kcontrol *kctl;
 	unsigned int id;
+	bool is_std_info;
 	usb_mixer_elem_dump_func_t dump;
 	usb_mixer_elem_resume_func_t resume;
 };
@@ -93,8 +105,12 @@
 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 				int request, int validx, int value_set);
 
-int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
-			      struct snd_kcontrol *kctl);
+int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
+			   struct snd_kcontrol *kctl,
+			   bool is_std_info);
+
+#define snd_usb_mixer_add_control(list, kctl) \
+	snd_usb_mixer_add_list(list, kctl, true)
 
 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
 				 struct usb_mixer_interface *mixer,
diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index 73baf39..dda1362 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -14,7 +14,7 @@
 	int id;
 	const char *name;
 	int control;
-	struct usbmix_dB_map *dB;
+	const struct usbmix_dB_map *dB;
 };
 
 struct usbmix_selector_map {
@@ -27,6 +27,7 @@
 	u32 id;
 	const struct usbmix_name_map *map;
 	const struct usbmix_selector_map *selector_map;
+	const struct usbmix_connector_map *connector_map;
 	int ignore_ctl_error;
 };
 
@@ -52,7 +53,7 @@
            ++--+->SU[11]-->FU[12] --------------------------------------------------------------------------------------> USB_OUT[13]
 */
 
-static struct usbmix_name_map extigy_map[] = {
+static const struct usbmix_name_map extigy_map[] = {
 	/* 1: IT pcm */
 	{ 2, "PCM Playback" }, /* FU */
 	/* 3: IT pcm */
@@ -93,12 +94,12 @@
  * e.g. no Master and fake PCM volume
  *			Pavel Mihaylov <bin@bash.info>
  */
-static struct usbmix_dB_map mp3plus_dB_1 = {.min = -4781, .max = 0};
+static const struct usbmix_dB_map mp3plus_dB_1 = {.min = -4781, .max = 0};
 						/* just guess */
-static struct usbmix_dB_map mp3plus_dB_2 = {.min = -1781, .max = 618};
+static const struct usbmix_dB_map mp3plus_dB_2 = {.min = -1781, .max = 618};
 						/* just guess */
 
-static struct usbmix_name_map mp3plus_map[] = {
+static const struct usbmix_name_map mp3plus_map[] = {
 	/* 1: IT pcm */
 	/* 2: IT mic */
 	/* 3: IT line */
@@ -139,7 +140,7 @@
             |                                              ^
             +->FU[13]--------------------------------------+
 */
-static struct usbmix_name_map audigy2nx_map[] = {
+static const struct usbmix_name_map audigy2nx_map[] = {
 	/* 1: IT pcm playback */
 	/* 4: IT digital in */
 	{ 6, "Digital In Playback" }, /* FU */
@@ -167,12 +168,12 @@
 	{ 0 } /* terminator */
 };
 
-static struct usbmix_name_map mbox1_map[] = {
+static const struct usbmix_name_map mbox1_map[] = {
 	{ 1, "Clock" },
 	{ 0 } /* terminator */
 };
 
-static struct usbmix_selector_map c400_selectors[] = {
+static const struct usbmix_selector_map c400_selectors[] = {
 	{
 		.id = 0x80,
 		.count = 2,
@@ -181,7 +182,7 @@
 	{ 0 } /* terminator */
 };
 
-static struct usbmix_selector_map audigy2nx_selectors[] = {
+static const struct usbmix_selector_map audigy2nx_selectors[] = {
 	{
 		.id = 14, /* Capture Source */
 		.count = 3,
@@ -201,21 +202,21 @@
 };
 
 /* Creative SoundBlaster Live! 24-bit External */
-static struct usbmix_name_map live24ext_map[] = {
+static const struct usbmix_name_map live24ext_map[] = {
 	/* 2: PCM Playback Volume */
 	{ 5, "Mic Capture" }, /* FU, default PCM Capture Volume */
 	{ 0 } /* terminator */
 };
 
 /* LineX FM Transmitter entry - needed to bypass controls bug */
-static struct usbmix_name_map linex_map[] = {
+static const struct usbmix_name_map linex_map[] = {
 	/* 1: IT pcm */
 	/* 2: OT Speaker */ 
 	{ 3, "Master" }, /* FU: master volume - left / right / mute */
 	{ 0 } /* terminator */
 };
 
-static struct usbmix_name_map maya44_map[] = {
+static const struct usbmix_name_map maya44_map[] = {
 	/* 1: IT line */
 	{ 2, "Line Playback" }, /* FU */
 	/* 3: IT line */
@@ -238,7 +239,7 @@
  * so this map removes all unwanted sliders from alsamixer
  */
 
-static struct usbmix_name_map justlink_map[] = {
+static const struct usbmix_name_map justlink_map[] = {
 	/* 1: IT pcm playback */
 	/* 2: Not present */
 	{ 3, NULL}, /* IT mic (No mic input on device) */
@@ -255,7 +256,7 @@
 };
 
 /* TerraTec Aureon 5.1 MkII USB */
-static struct usbmix_name_map aureon_51_2_map[] = {
+static const struct usbmix_name_map aureon_51_2_map[] = {
 	/* 1: IT USB */
 	/* 2: IT Mic */
 	/* 3: IT Line */
@@ -274,7 +275,7 @@
 	{} /* terminator */
 };
 
-static struct usbmix_name_map scratch_live_map[] = {
+static const struct usbmix_name_map scratch_live_map[] = {
 	/* 1: IT Line 1 (USB streaming) */
 	/* 2: OT Line 1 (Speaker) */
 	/* 3: IT Line 1 (Line connector) */
@@ -290,7 +291,7 @@
 	{ 0 } /* terminator */
 };
 
-static struct usbmix_name_map ebox44_map[] = {
+static const struct usbmix_name_map ebox44_map[] = {
 	{ 4, NULL }, /* FU */
 	{ 6, NULL }, /* MU */
 	{ 7, NULL }, /* FU */
@@ -305,7 +306,7 @@
  *  FIXME: or mp3plus_map should use "Capture Source" too,
  *  so this maps can be merget
  */
-static struct usbmix_name_map hercules_usb51_map[] = {
+static const struct usbmix_name_map hercules_usb51_map[] = {
 	{ 8, "Capture Source" },	/* SU, default "PCM Capture Source" */
 	{ 9, "Master Playback" },	/* FU, default "Speaker Playback" */
 	{ 10, "Mic Boost", 7 },		/* FU, default "Auto Gain Input" */
@@ -316,7 +317,7 @@
 };
 
 /* Plantronics Gamecom 780 has a broken volume control, better to disable it */
-static struct usbmix_name_map gamecom780_map[] = {
+static const struct usbmix_name_map gamecom780_map[] = {
 	{ 9, NULL }, /* FU, speaker out */
 	{}
 };
@@ -330,12 +331,19 @@
 };
 
 /* Bose companion 5, the dB conversion factor is 16 instead of 256 */
-static struct usbmix_dB_map bose_companion5_dB = {-5006, -6};
-static struct usbmix_name_map bose_companion5_map[] = {
+static const struct usbmix_dB_map bose_companion5_dB = {-5006, -6};
+static const struct usbmix_name_map bose_companion5_map[] = {
 	{ 3, NULL, .dB = &bose_companion5_dB },
 	{ 0 }	/* terminator */
 };
 
+/* Sennheiser Communications Headset [PC 8], the dB value is reported as -6 negative maximum  */
+static const struct usbmix_dB_map sennheiser_pc8_dB = {-9500, 0};
+static const struct usbmix_name_map sennheiser_pc8_map[] = {
+	{ 9, NULL, .dB = &sennheiser_pc8_dB },
+	{ 0 }   /* terminator */
+};
+
 /*
  * Dell usb dock with ALC4020 codec had a firmware problem where it got
  * screwed up when zero volume is passed; just skip it as a workaround
@@ -349,11 +357,63 @@
 	{ 0 }
 };
 
+/* Some mobos shipped with a dummy HD-audio show the invalid GET_MIN/GET_MAX
+ * response for Input Gain Pad (id=19, control=12) and the connector status
+ * for SPDIF terminal (id=18).  Skip them.
+ */
+static const struct usbmix_name_map asus_rog_map[] = {
+	{ 18, NULL }, /* OT, connector control */
+	{ 19, NULL, 12 }, /* FU, Input Gain Pad */
+	{}
+};
+
+/* TRX40 mobos with Realtek ALC1220-VB */
+static const struct usbmix_name_map trx40_mobo_map[] = {
+	{ 18, NULL }, /* OT, IEC958 - broken response, disabled */
+	{ 19, NULL, 12 }, /* FU, Input Gain Pad - broken response, disabled */
+	{ 16, "Speaker" },		/* OT */
+	{ 22, "Speaker Playback" },	/* FU */
+	{ 7, "Line" },			/* IT */
+	{ 19, "Line Capture" },		/* FU */
+	{ 17, "Front Headphone" },	/* OT */
+	{ 23, "Front Headphone Playback" },	/* FU */
+	{ 8, "Mic" },			/* IT */
+	{ 20, "Mic Capture" },		/* FU */
+	{ 9, "Front Mic" },		/* IT */
+	{ 21, "Front Mic Capture" },	/* FU */
+	{ 24, "IEC958 Playback" },	/* FU */
+	{}
+};
+
+static const struct usbmix_connector_map trx40_mobo_connector_map[] = {
+	{ 10, 16 },	/* (Back) Speaker */
+	{ 11, 17 },	/* Front Headphone */
+	{ 13, 7 },	/* Line */
+	{ 14, 8 },	/* Mic */
+	{ 15, 9 },	/* Front Mic */
+	{}
+};
+
+/* Rear panel + front mic on Gigabyte TRX40 Aorus Master with ALC1220-VB */
+static const struct usbmix_name_map aorus_master_alc1220vb_map[] = {
+	{ 17, NULL },			/* OT, IEC958?, disabled */
+	{ 19, NULL, 12 }, /* FU, Input Gain Pad - broken response, disabled */
+	{ 16, "Line Out" },		/* OT */
+	{ 22, "Line Out Playback" },	/* FU */
+	{ 7, "Line" },			/* IT */
+	{ 19, "Line Capture" },		/* FU */
+	{ 8, "Mic" },			/* IT */
+	{ 20, "Mic Capture" },		/* FU */
+	{ 9, "Front Mic" },		/* IT */
+	{ 21, "Front Mic Capture" },	/* FU */
+	{}
+};
+
 /*
  * Control map entries
  */
 
-static struct usbmix_ctl_map usbmix_ctl_maps[] = {
+static const struct usbmix_ctl_map usbmix_ctl_maps[] = {
 	{
 		.id = USB_ID(0x041e, 0x3000),
 		.map = extigy_map,
@@ -468,6 +528,38 @@
 		.id = USB_ID(0x05a7, 0x1020),
 		.map = bose_companion5_map,
 	},
+	{	/* Gigabyte TRX40 Aorus Master (rear panel + front mic) */
+		.id = USB_ID(0x0414, 0xa001),
+		.map = aorus_master_alc1220vb_map,
+	},
+	{	/* Gigabyte TRX40 Aorus Pro WiFi */
+		.id = USB_ID(0x0414, 0xa002),
+		.map = trx40_mobo_map,
+		.connector_map = trx40_mobo_connector_map,
+	},
+	{	/* ASUS ROG Zenith II */
+		.id = USB_ID(0x0b05, 0x1916),
+		.map = asus_rog_map,
+	},
+	{	/* ASUS ROG Strix */
+		.id = USB_ID(0x0b05, 0x1917),
+		.map = asus_rog_map,
+	},
+	{	/* MSI TRX40 Creator */
+		.id = USB_ID(0x0db0, 0x0d64),
+		.map = trx40_mobo_map,
+		.connector_map = trx40_mobo_connector_map,
+	},
+	{	/* MSI TRX40 */
+		.id = USB_ID(0x0db0, 0x543d),
+		.map = trx40_mobo_map,
+		.connector_map = trx40_mobo_connector_map,
+	},
+	{	/* Asrock TRX40 Creator */
+		.id = USB_ID(0x26ce, 0x0a01),
+		.map = trx40_mobo_map,
+		.connector_map = trx40_mobo_connector_map,
+	},
 	{ 0 } /* terminator */
 };
 
@@ -475,37 +567,37 @@
  * Control map entries for UAC3 BADD profiles
  */
 
-static struct usbmix_name_map uac3_badd_generic_io_map[] = {
+static const struct usbmix_name_map uac3_badd_generic_io_map[] = {
 	{ UAC3_BADD_FU_ID2, "Generic Out Playback" },
 	{ UAC3_BADD_FU_ID5, "Generic In Capture" },
 	{ 0 }					/* terminator */
 };
-static struct usbmix_name_map uac3_badd_headphone_map[] = {
+static const struct usbmix_name_map uac3_badd_headphone_map[] = {
 	{ UAC3_BADD_FU_ID2, "Headphone Playback" },
 	{ 0 }					/* terminator */
 };
-static struct usbmix_name_map uac3_badd_speaker_map[] = {
+static const struct usbmix_name_map uac3_badd_speaker_map[] = {
 	{ UAC3_BADD_FU_ID2, "Speaker Playback" },
 	{ 0 }					/* terminator */
 };
-static struct usbmix_name_map uac3_badd_microphone_map[] = {
+static const struct usbmix_name_map uac3_badd_microphone_map[] = {
 	{ UAC3_BADD_FU_ID5, "Mic Capture" },
 	{ 0 }					/* terminator */
 };
 /* Covers also 'headset adapter' profile */
-static struct usbmix_name_map uac3_badd_headset_map[] = {
+static const struct usbmix_name_map uac3_badd_headset_map[] = {
 	{ UAC3_BADD_FU_ID2, "Headset Playback" },
 	{ UAC3_BADD_FU_ID5, "Headset Capture" },
 	{ UAC3_BADD_FU_ID7, "Sidetone Mixing" },
 	{ 0 }					/* terminator */
 };
-static struct usbmix_name_map uac3_badd_speakerphone_map[] = {
+static const struct usbmix_name_map uac3_badd_speakerphone_map[] = {
 	{ UAC3_BADD_FU_ID2, "Speaker Playback" },
 	{ UAC3_BADD_FU_ID5, "Mic Capture" },
 	{ 0 }					/* terminator */
 };
 
-static struct usbmix_ctl_map uac3_badd_usbmix_ctl_maps[] = {
+static const struct usbmix_ctl_map uac3_badd_usbmix_ctl_maps[] = {
 	{
 		.id = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
 		.map = uac3_badd_generic_io_map,
@@ -534,5 +626,10 @@
 		.id = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
 		.map = uac3_badd_speakerphone_map,
 	},
+	{
+		/* Sennheiser Communications Headset [PC 8] */
+		.id = USB_ID(0x1395, 0x0025),
+		.map = sennheiser_pc8_map,
+	},
 	{ 0 } /* terminator */
 };
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 39e27ae..d926869 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -119,7 +119,7 @@
  * Create a set of standard UAC controls from a table
  */
 static int snd_create_std_mono_table(struct usb_mixer_interface *mixer,
-				struct std_mono_table *t)
+				     const struct std_mono_table *t)
 {
 	int err;
 
@@ -157,7 +157,8 @@
 		return -ENOMEM;
 	}
 	kctl->private_free = snd_usb_mixer_elem_free;
-	return snd_usb_mixer_add_control(list, kctl);
+	/* don't use snd_usb_mixer_add_control() here, this is a special list element */
+	return snd_usb_mixer_add_list(list, kctl, false);
 }
 
 /*
@@ -183,6 +184,7 @@
 	{ USB_ID(0x041e, 0x3042), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 */
 	{ USB_ID(0x041e, 0x30df), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
 	{ USB_ID(0x041e, 0x3237), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
+	{ USB_ID(0x041e, 0x3263), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
 	{ USB_ID(0x041e, 0x3048), 2, 2, 6, 6,  2,  0x6e91 }, /* Toshiba SB0500 */
 };
 
@@ -1386,7 +1388,7 @@
  * are valid they presents mono controls as L and R channels of
  * stereo. So we provide a good mixer here.
  */
-static struct std_mono_table ebox44_table[] = {
+static const struct std_mono_table ebox44_table[] = {
 	{
 		.unitid = 4,
 		.control = 1,
@@ -1508,11 +1510,15 @@
 
 	/* use known values for that card: interface#1 altsetting#1 */
 	iface = usb_ifnum_to_if(chip->dev, 1);
-	if (!iface || iface->num_altsetting < 2)
-		return -EINVAL;
+	if (!iface || iface->num_altsetting < 2) {
+		err = -EINVAL;
+		goto end;
+	}
 	alts = &iface->altsetting[1];
-	if (get_iface_desc(alts)->bNumEndpoints < 1)
-		return -EINVAL;
+	if (get_iface_desc(alts)->bNumEndpoints < 1) {
+		err = -EINVAL;
+		goto end;
+	}
 	ep = get_endpoint(alts, 0)->bEndpointAddress;
 
 	err = snd_usb_ctl_msg(chip->dev,
@@ -1691,7 +1697,7 @@
 static int snd_microii_controls_create(struct usb_mixer_interface *mixer)
 {
 	int err, i;
-	static usb_mixer_elem_resume_func_t resume_funcs[] = {
+	static const usb_mixer_elem_resume_func_t resume_funcs[] = {
 		snd_microii_spdif_default_update,
 		NULL,
 		snd_microii_spdif_switch_update
@@ -2262,7 +2268,7 @@
 	case USB_ID(0x1235, 0x8203): /* Focusrite Scarlett 6i6 2nd Gen */
 	case USB_ID(0x1235, 0x8204): /* Focusrite Scarlett 18i8 2nd Gen */
 	case USB_ID(0x1235, 0x8201): /* Focusrite Scarlett 18i20 2nd Gen */
-		err = snd_scarlett_gen2_controls_create(mixer);
+		err = snd_scarlett_gen2_init(mixer);
 		break;
 
 	case USB_ID(0x041e, 0x323b): /* Creative Sound Blaster E1 */
diff --git a/sound/usb/mixer_scarlett.c b/sound/usb/mixer_scarlett.c
index 83715fd..6217424 100644
--- a/sound/usb/mixer_scarlett.c
+++ b/sound/usb/mixer_scarlett.c
@@ -623,7 +623,7 @@
 /********************** device-specific config *************************/
 
 /*  untested...  */
-static struct scarlett_device_info s6i6_info = {
+static const struct scarlett_device_info s6i6_info = {
 	.matrix_in = 18,
 	.matrix_out = 8,
 	.input_len = 6,
@@ -665,7 +665,7 @@
 };
 
 /*  untested...  */
-static struct scarlett_device_info s8i6_info = {
+static const struct scarlett_device_info s8i6_info = {
 	.matrix_in = 18,
 	.matrix_out = 6,
 	.input_len = 8,
@@ -704,7 +704,7 @@
 	}
 };
 
-static struct scarlett_device_info s18i6_info = {
+static const struct scarlett_device_info s18i6_info = {
 	.matrix_in = 18,
 	.matrix_out = 6,
 	.input_len = 18,
@@ -741,7 +741,7 @@
 	}
 };
 
-static struct scarlett_device_info s18i8_info = {
+static const struct scarlett_device_info s18i8_info = {
 	.matrix_in = 18,
 	.matrix_out = 8,
 	.input_len = 18,
@@ -783,7 +783,7 @@
 	}
 };
 
-static struct scarlett_device_info s18i20_info = {
+static const struct scarlett_device_info s18i20_info = {
 	.matrix_in = 18,
 	.matrix_out = 8,
 	.input_len = 18,
@@ -833,7 +833,7 @@
 
 
 static int scarlett_controls_create_generic(struct usb_mixer_interface *mixer,
-	struct scarlett_device_info *info)
+	const struct scarlett_device_info *info)
 {
 	int i, err;
 	char mx[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
@@ -896,7 +896,7 @@
 {
 	int err, i, o;
 	char mx[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
-	struct scarlett_device_info *info;
+	const struct scarlett_device_info *info;
 	struct usb_mixer_elem_info *elem;
 	static char sample_rate_buffer[4] = { '\x80', '\xbb', '\x00', '\x00' };
 
diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c
index 94b903d..ab7abe3 100644
--- a/sound/usb/mixer_scarlett_gen2.c
+++ b/sound/usb/mixer_scarlett_gen2.c
@@ -254,10 +254,10 @@
 	.pad_input_count = 2,
 
 	.line_out_descrs = {
-		"Monitor L",
-		"Monitor R",
-		"Headphones L",
-		"Headphones R",
+		"Headphones 1 L",
+		"Headphones 1 R",
+		"Headphones 2 L",
+		"Headphones 2 R",
 	},
 
 	.ports = {
@@ -356,7 +356,7 @@
 		},
 		[SCARLETT2_PORT_TYPE_PCM] = {
 			.id = 0x600,
-			.num = { 20, 18, 18, 14, 10 },
+			.num = { 8, 18, 18, 14, 10 },
 			.src_descr = "PCM %d",
 			.src_num_offset = 1,
 			.dst_descr = "PCM %02d Capture"
@@ -558,11 +558,11 @@
 
 /* proprietary request/response format */
 struct scarlett2_usb_packet {
-	u32 cmd;
-	u16 size;
-	u16 seq;
-	u32 error;
-	u32 pad;
+	__le32 cmd;
+	__le16 size;
+	__le16 seq;
+	__le32 error;
+	__le32 pad;
 	u8 data[];
 };
 
@@ -635,7 +635,7 @@
 	/* send a second message to get the response */
 
 	err = snd_usb_ctl_msg(mixer->chip->dev,
-			usb_sndctrlpipe(mixer->chip->dev, 0),
+			usb_rcvctrlpipe(mixer->chip->dev, 0),
 			SCARLETT2_USB_VENDOR_SPECIFIC_CMD_RESP,
 			USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 			0,
@@ -664,11 +664,11 @@
 			"Scarlett Gen 2 USB invalid response; "
 			   "cmd tx/rx %d/%d seq %d/%d size %d/%d "
 			   "error %d pad %d\n",
-			le16_to_cpu(req->cmd), le16_to_cpu(resp->cmd),
+			le32_to_cpu(req->cmd), le32_to_cpu(resp->cmd),
 			le16_to_cpu(req->seq), le16_to_cpu(resp->seq),
 			resp_size, le16_to_cpu(resp->size),
-			le16_to_cpu(resp->error),
-			le16_to_cpu(resp->pad));
+			le32_to_cpu(resp->error),
+			le32_to_cpu(resp->pad));
 		err = -EINVAL;
 		goto unlock;
 	}
@@ -687,7 +687,7 @@
 /* Send SCARLETT2_USB_DATA_CMD SCARLETT2_USB_CONFIG_SAVE */
 static void scarlett2_config_save(struct usb_mixer_interface *mixer)
 {
-	u32 req = cpu_to_le32(SCARLETT2_USB_CONFIG_SAVE);
+	__le32 req = cpu_to_le32(SCARLETT2_USB_CONFIG_SAVE);
 
 	scarlett2_usb(mixer, SCARLETT2_USB_DATA_CMD,
 		      &req, sizeof(u32),
@@ -713,11 +713,11 @@
 	const struct scarlett2_config config_item =
 	       scarlett2_config_items[config_item_num];
 	struct {
-		u32 offset;
-		u32 bytes;
-		s32 value;
+		__le32 offset;
+		__le32 bytes;
+		__le32 value;
 	} __packed req;
-	u32 req2;
+	__le32 req2;
 	int err;
 	struct scarlett2_mixer_data *private = mixer->private_data;
 
@@ -753,8 +753,8 @@
 	int offset, void *buf, int size)
 {
 	struct {
-		u32 offset;
-		u32 size;
+		__le32 offset;
+		__le32 size;
 	} __packed req;
 
 	req.offset = cpu_to_le32(offset);
@@ -794,8 +794,8 @@
 	const struct scarlett2_device_info *info = private->info;
 
 	struct {
-		u16 mix_num;
-		u16 data[SCARLETT2_INPUT_MIX_MAX];
+		__le16 mix_num;
+		__le16 data[SCARLETT2_INPUT_MIX_MAX];
 	} __packed req;
 
 	int i, j;
@@ -850,9 +850,9 @@
 	};
 
 	struct {
-		u16 pad;
-		u16 num;
-		u32 data[SCARLETT2_MUX_MAX];
+		__le16 pad;
+		__le16 num;
+		__le32 data[SCARLETT2_MUX_MAX];
 	} __packed req;
 
 	req.pad = 0;
@@ -911,9 +911,9 @@
 					  u16 *levels)
 {
 	struct {
-		u16 pad;
-		u16 num_meters;
-		u32 magic;
+		__le16 pad;
+		__le16 num_meters;
+		__le32 magic;
 	} __packed req;
 	u32 resp[SCARLETT2_NUM_METERS];
 	int i, err;
@@ -949,10 +949,15 @@
 	if (!elem)
 		return -ENOMEM;
 
+	/* We set USB_MIXER_BESPOKEN type, so that the core USB mixer code
+	 * ignores them for resume and other operations.
+	 * Also, the head.id field is set to 0, as we don't use this field.
+	 */
 	elem->head.mixer = mixer;
 	elem->control = index;
-	elem->head.id = index;
+	elem->head.id = 0;
 	elem->channels = channels;
+	elem->val_type = USB_MIXER_BESPOKEN;
 
 	kctl = snd_ctl_new1(ncontrol, elem);
 	if (!kctl) {
@@ -1028,11 +1033,10 @@
 	struct usb_mixer_interface *mixer = elem->head.mixer;
 	struct scarlett2_mixer_data *private = mixer->private_data;
 
-	if (private->vol_updated) {
-		mutex_lock(&private->data_mutex);
+	mutex_lock(&private->data_mutex);
+	if (private->vol_updated)
 		scarlett2_update_volumes(mixer);
-		mutex_unlock(&private->data_mutex);
-	}
+	mutex_unlock(&private->data_mutex);
 
 	ucontrol->value.integer.value[0] = private->master_vol;
 	return 0;
@@ -1046,11 +1050,10 @@
 	struct scarlett2_mixer_data *private = mixer->private_data;
 	int index = elem->control;
 
-	if (private->vol_updated) {
-		mutex_lock(&private->data_mutex);
+	mutex_lock(&private->data_mutex);
+	if (private->vol_updated)
 		scarlett2_update_volumes(mixer);
-		mutex_unlock(&private->data_mutex);
-	}
+	mutex_unlock(&private->data_mutex);
 
 	ucontrol->value.integer.value[0] = private->vol[index];
 	return 0;
@@ -1181,6 +1184,8 @@
 	/* Send SW/HW switch change to the device */
 	err = scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_SW_HW_SWITCH,
 				       index, val);
+	if (err == 0)
+		err = 1;
 
 unlock:
 	mutex_unlock(&private->data_mutex);
@@ -1241,6 +1246,8 @@
 	/* Send switch change to the device */
 	err = scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_LEVEL_SWITCH,
 				       index, val);
+	if (err == 0)
+		err = 1;
 
 unlock:
 	mutex_unlock(&private->data_mutex);
@@ -1291,6 +1298,8 @@
 	/* Send switch change to the device */
 	err = scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_PAD_SWITCH,
 				       index, val);
+	if (err == 0)
+		err = 1;
 
 unlock:
 	mutex_unlock(&private->data_mutex);
@@ -1314,11 +1323,10 @@
 	struct usb_mixer_interface *mixer = elem->head.mixer;
 	struct scarlett2_mixer_data *private = mixer->private_data;
 
-	if (private->vol_updated) {
-		mutex_lock(&private->data_mutex);
+	mutex_lock(&private->data_mutex);
+	if (private->vol_updated)
 		scarlett2_update_volumes(mixer);
-		mutex_unlock(&private->data_mutex);
-	}
+	mutex_unlock(&private->data_mutex);
 
 	ucontrol->value.enumerated.item[0] = private->buttons[elem->control];
 	return 0;
@@ -1347,6 +1355,8 @@
 	/* Send switch change to the device */
 	err = scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_BUTTONS,
 				       index, val);
+	if (err == 0)
+		err = 1;
 
 unlock:
 	mutex_unlock(&private->data_mutex);
@@ -1997,38 +2007,11 @@
 	return usb_submit_urb(mixer->urb, GFP_KERNEL);
 }
 
-/* Entry point */
-int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer)
+static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer,
+					     const struct scarlett2_device_info *info)
 {
-	const struct scarlett2_device_info *info;
 	int err;
 
-	/* only use UAC_VERSION_2 */
-	if (!mixer->protocol)
-		return 0;
-
-	switch (mixer->chip->usb_id) {
-	case USB_ID(0x1235, 0x8203):
-		info = &s6i6_gen2_info;
-		break;
-	case USB_ID(0x1235, 0x8204):
-		info = &s18i8_gen2_info;
-		break;
-	case USB_ID(0x1235, 0x8201):
-		info = &s18i20_gen2_info;
-		break;
-	default: /* device not (yet) supported */
-		return -EINVAL;
-	}
-
-	if (!(mixer->chip->setup & SCARLETT2_ENABLE)) {
-		usb_audio_err(mixer->chip,
-			"Focusrite Scarlett Gen 2 Mixer Driver disabled; "
-			"use options snd_usb_audio device_setup=1 "
-			"to enable and report any issues to g@b4.vu");
-		return 0;
-	}
-
 	/* Initialise private data, routing, sequence number */
 	err = scarlett2_init_private(mixer, info);
 	if (err < 0)
@@ -2073,3 +2056,51 @@
 
 	return 0;
 }
+
+int snd_scarlett_gen2_init(struct usb_mixer_interface *mixer)
+{
+	struct snd_usb_audio *chip = mixer->chip;
+	const struct scarlett2_device_info *info;
+	int err;
+
+	/* only use UAC_VERSION_2 */
+	if (!mixer->protocol)
+		return 0;
+
+	switch (chip->usb_id) {
+	case USB_ID(0x1235, 0x8203):
+		info = &s6i6_gen2_info;
+		break;
+	case USB_ID(0x1235, 0x8204):
+		info = &s18i8_gen2_info;
+		break;
+	case USB_ID(0x1235, 0x8201):
+		info = &s18i20_gen2_info;
+		break;
+	default: /* device not (yet) supported */
+		return -EINVAL;
+	}
+
+	if (!(chip->setup & SCARLETT2_ENABLE)) {
+		usb_audio_info(chip,
+			"Focusrite Scarlett Gen 2 Mixer Driver disabled; "
+			"use options snd_usb_audio vid=0x%04x pid=0x%04x "
+			"device_setup=1 to enable and report any issues "
+			"to g@b4.vu",
+			USB_ID_VENDOR(chip->usb_id),
+			USB_ID_PRODUCT(chip->usb_id));
+		return 0;
+	}
+
+	usb_audio_info(chip,
+		"Focusrite Scarlett Gen 2 Mixer Driver enabled pid=0x%04x",
+		USB_ID_PRODUCT(chip->usb_id));
+
+	err = snd_scarlett_gen2_controls_create(mixer, info);
+	if (err < 0)
+		usb_audio_err(mixer->chip,
+			      "Error initialising Scarlett Mixer Driver: %d",
+			      err);
+
+	return err;
+}
diff --git a/sound/usb/mixer_scarlett_gen2.h b/sound/usb/mixer_scarlett_gen2.h
index 52e1dad..668c6b0 100644
--- a/sound/usb/mixer_scarlett_gen2.h
+++ b/sound/usb/mixer_scarlett_gen2.h
@@ -2,6 +2,6 @@
 #ifndef __USB_MIXER_SCARLETT_GEN2_H
 #define __USB_MIXER_SCARLETT_GEN2_H
 
-int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer);
+int snd_scarlett_gen2_init(struct usb_mixer_interface *mixer);
 
 #endif /* __USB_MIXER_SCARLETT_GEN2_H */
diff --git a/sound/usb/mixer_us16x08.c b/sound/usb/mixer_us16x08.c
index f0e8e15..c6c834a 100644
--- a/sound/usb/mixer_us16x08.c
+++ b/sound/usb/mixer_us16x08.c
@@ -607,7 +607,7 @@
 static int snd_us16x08_meter_info(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_info *uinfo)
 {
-	uinfo->count = 1;
+	uinfo->count = 34;
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 	uinfo->value.integer.max = 0x7FFF;
 	uinfo->value.integer.min = 0;
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index ff5ab24..7521853 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -323,6 +323,7 @@
 	switch (subs->stream->chip->usb_id) {
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
+	case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
 		ep = 0x81;
 		ifnum = 3;
 		goto add_sync_ep_from_ifnum;
@@ -332,6 +333,7 @@
 		ifnum = 2;
 		goto add_sync_ep_from_ifnum;
 	case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
+	case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
 		ep = 0x86;
 		ifnum = 2;
 		goto add_sync_ep_from_ifnum;
@@ -339,15 +341,32 @@
 		ep = 0x81;
 		ifnum = 2;
 		goto add_sync_ep_from_ifnum;
+	case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
+		ep = 0x82;
+		ifnum = 2;
+		goto add_sync_ep_from_ifnum;
 	case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 	case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 		ep = 0x81;
 		ifnum = 1;
 		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
+	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
+		/* MicroBook IIc */
+		if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
+			return 0;
+
+		/* MicroBook II */
 		ep = 0x84;
 		ifnum = 0;
 		goto add_sync_ep_from_ifnum;
+	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
+	case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
+	case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
+	case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
+	case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
+		ep = 0x81;
+		ifnum = 2;
+		goto add_sync_ep_from_ifnum;
 	case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 		/* BOSS Katana amplifiers do not need quirks */
 		return 0;
@@ -370,7 +389,7 @@
 add_sync_ep_from_ifnum:
 	iface = usb_ifnum_to_if(dev, ifnum);
 
-	if (!iface || iface->num_altsetting == 0)
+	if (!iface || iface->num_altsetting < 2)
 		return -EINVAL;
 
 	alts = &iface->altsetting[1];
@@ -382,6 +401,8 @@
 	if (!subs->sync_endpoint)
 		return -EINVAL;
 
+	subs->sync_endpoint->is_implicit_feedback = 1;
+
 	subs->data_endpoint->sync_master = subs->sync_endpoint;
 
 	return 1;
@@ -480,12 +501,15 @@
 						   implicit_fb ?
 							SND_USB_ENDPOINT_TYPE_DATA :
 							SND_USB_ENDPOINT_TYPE_SYNC);
+
 	if (!subs->sync_endpoint) {
 		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 			return 0;
 		return -EINVAL;
 	}
 
+	subs->sync_endpoint->is_implicit_feedback = implicit_fb;
+
 	subs->data_endpoint->sync_master = subs->sync_endpoint;
 
 	return 0;
@@ -506,15 +530,15 @@
 	if (WARN_ON(!iface))
 		return -EINVAL;
 	alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
-	altsd = get_iface_desc(alts);
-	if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
+	if (WARN_ON(!alts))
 		return -EINVAL;
+	altsd = get_iface_desc(alts);
 
-	if (fmt == subs->cur_audiofmt)
+	if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 		return 0;
 
 	/* close the old interface */
-	if (subs->interface >= 0 && subs->interface != fmt->iface) {
+	if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 		if (!subs->stream->chip->keep_iface) {
 			err = usb_set_interface(subs->dev, subs->interface, 0);
 			if (err < 0) {
@@ -528,6 +552,9 @@
 		subs->altset_idx = 0;
 	}
 
+	if (subs->need_setup_fmt)
+		subs->need_setup_fmt = false;
+
 	/* set interface */
 	if (iface->cur_altsetting != alts) {
 		err = snd_usb_select_mode_quirk(subs, fmt);
@@ -1397,6 +1424,12 @@
 			// continue;
 		}
 		bytes = urb->iso_frame_desc[i].actual_length;
+		if (subs->stream_offset_adj > 0) {
+			unsigned int adj = min(subs->stream_offset_adj, bytes);
+			cp += adj;
+			bytes -= adj;
+			subs->stream_offset_adj -= adj;
+		}
 		frames = bytes / stride;
 		if (!subs->txfr_quirk)
 			bytes = frames * stride;
@@ -1735,6 +1768,13 @@
 		subs->data_endpoint->retire_data_urb = retire_playback_urb;
 		subs->running = 0;
 		return 0;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
+			stop_endpoints(subs, true);
+			subs->need_setup_fmt = true;
+			return 0;
+		}
+		break;
 	}
 
 	return -EINVAL;
@@ -1757,6 +1797,7 @@
 		return 0;
 	case SNDRV_PCM_TRIGGER_STOP:
 		stop_endpoints(subs, false);
+		subs->data_endpoint->retire_data_urb = NULL;
 		subs->running = 0;
 		return 0;
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
@@ -1767,6 +1808,13 @@
 		subs->data_endpoint->retire_data_urb = retire_capture_urb;
 		subs->running = 1;
 		return 0;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
+			stop_endpoints(subs, true);
+			subs->need_setup_fmt = true;
+			return 0;
+		}
+		break;
 	}
 
 	return -EINVAL;
@@ -1837,7 +1885,7 @@
 {
 	struct snd_pcm *pcm = subs->stream->pcm;
 	struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
-	struct device *dev = subs->dev->bus->controller;
+	struct device *dev = subs->dev->bus->sysdev;
 
 	if (!snd_usb_use_vmalloc)
 		snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
diff --git a/sound/usb/proc.c b/sound/usb/proc.c
index 49e3f17..ffbf4bd 100644
--- a/sound/usb/proc.c
+++ b/sound/usb/proc.c
@@ -60,7 +60,7 @@
 static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
 {
 	struct audioformat *fp;
-	static char *sync_types[4] = {
+	static const char * const sync_types[4] = {
 		"NONE", "ASYNC", "ADAPTIVE", "SYNC"
 	};
 
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 70c338f..441335a 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -25,6 +25,26 @@
 	.idProduct = prod, \
 	.bInterfaceClass = USB_CLASS_VENDOR_SPEC
 
+/* HP Thunderbolt Dock Audio Headset */
+{
+	USB_DEVICE(0x03f0, 0x0269),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.vendor_name = "HP",
+		.product_name = "Thunderbolt Dock Audio Headset",
+		.profile_name = "HP-Thunderbolt-Dock-Audio-Headset",
+		.ifnum = QUIRK_NO_INTERFACE
+	}
+},
+/* HP Thunderbolt Dock Audio Module */
+{
+	USB_DEVICE(0x03f0, 0x0567),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.vendor_name = "HP",
+		.product_name = "Thunderbolt Dock Audio Module",
+		.profile_name = "HP-Thunderbolt-Dock-Audio-Module",
+		.ifnum = QUIRK_NO_INTERFACE
+	}
+},
 /* FTDI devices */
 {
 	USB_DEVICE(0x0403, 0xb8d8),
@@ -2465,6 +2485,16 @@
 	}
 },
 
+{
+	USB_DEVICE_VENDOR_SPEC(0x0944, 0x0204),
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+		.vendor_name = "KORG, Inc.",
+		/* .product_name = "ToneLab EX", */
+		.ifnum = 3,
+		.type = QUIRK_MIDI_STANDARD_INTERFACE,
+	}
+},
+
 /* AKAI devices */
 {
 	USB_DEVICE(0x09e8, 0x0062),
@@ -2677,6 +2707,10 @@
 		.data = (const struct snd_usb_audio_quirk[]) {
 			{
 				.ifnum = 0,
+				.type = QUIRK_AUDIO_STANDARD_MIXER,
+			},
+			{
+				.ifnum = 0,
 				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
 				.data = &(const struct audioformat) {
 					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
@@ -2687,6 +2721,32 @@
 					.attributes = UAC_EP_CS_ATTR_SAMPLE_RATE,
 					.endpoint = 0x01,
 					.ep_attr = USB_ENDPOINT_XFER_ISOC,
+					.datainterval = 1,
+					.maxpacksize = 0x024c,
+					.rates = SNDRV_PCM_RATE_44100 |
+						 SNDRV_PCM_RATE_48000,
+					.rate_min = 44100,
+					.rate_max = 48000,
+					.nr_rates = 2,
+					.rate_table = (unsigned int[]) {
+						44100, 48000
+					}
+				}
+			},
+			{
+				.ifnum = 0,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 2,
+					.iface = 0,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.attributes = 0,
+					.endpoint = 0x82,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC,
+					.datainterval = 1,
+					.maxpacksize = 0x0126,
 					.rates = SNDRV_PCM_RATE_44100 |
 						 SNDRV_PCM_RATE_48000,
 					.rate_min = 44100,
@@ -2756,90 +2816,6 @@
 		.type = QUIRK_MIDI_NOVATION
 	}
 },
-{
-	/*
-	 * Focusrite Scarlett Solo 2nd generation
-	 * Reports that playback should use Synch: Synchronous
-	 * while still providing a feedback endpoint. Synchronous causes
-	 * snapping on some sample rates.
-	 * Force it to use Synch: Asynchronous.
-	 */
-	USB_DEVICE(0x1235, 0x8205),
-	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
-		.ifnum = QUIRK_ANY_INTERFACE,
-		.type = QUIRK_COMPOSITE,
-		.data = (const struct snd_usb_audio_quirk[]) {
-			{
-				.ifnum = 1,
-				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
-				.data = & (const struct audioformat) {
-					.formats = SNDRV_PCM_FMTBIT_S32_LE,
-					.channels = 2,
-					.iface = 1,
-					.altsetting = 1,
-					.altset_idx = 1,
-					.attributes = 0,
-					.endpoint = 0x01,
-					.ep_attr = USB_ENDPOINT_XFER_ISOC |
-						   USB_ENDPOINT_SYNC_ASYNC,
-					.protocol = UAC_VERSION_2,
-					.rates = SNDRV_PCM_RATE_44100 |
-						 SNDRV_PCM_RATE_48000 |
-						 SNDRV_PCM_RATE_88200 |
-						 SNDRV_PCM_RATE_96000 |
-						 SNDRV_PCM_RATE_176400 |
-						 SNDRV_PCM_RATE_192000,
-					.rate_min = 44100,
-					.rate_max = 192000,
-					.nr_rates = 6,
-					.rate_table = (unsigned int[]) {
-						44100, 48000, 88200,
-						96000, 176400, 192000
-					},
-					.clock = 41
-				}
-			},
-			{
-				.ifnum = 2,
-				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
-				.data = & (const struct audioformat) {
-					.formats = SNDRV_PCM_FMTBIT_S32_LE,
-					.channels = 2,
-					.iface = 2,
-					.altsetting = 1,
-					.altset_idx = 1,
-					.attributes = 0,
-					.endpoint = 0x82,
-					.ep_attr = USB_ENDPOINT_XFER_ISOC |
-						   USB_ENDPOINT_SYNC_ASYNC |
-						   USB_ENDPOINT_USAGE_IMPLICIT_FB,
-					.protocol = UAC_VERSION_2,
-					.rates = SNDRV_PCM_RATE_44100 |
-						 SNDRV_PCM_RATE_48000 |
-						 SNDRV_PCM_RATE_88200 |
-						 SNDRV_PCM_RATE_96000 |
-						 SNDRV_PCM_RATE_176400 |
-						 SNDRV_PCM_RATE_192000,
-					.rate_min = 44100,
-					.rate_max = 192000,
-					.nr_rates = 6,
-					.rate_table = (unsigned int[]) {
-						44100, 48000, 88200,
-						96000, 176400, 192000
-					},
-					.clock = 41
-				}
-			},
-			{
-				.ifnum = 3,
-				.type = QUIRK_IGNORE_INTERFACE
-			},
-			{
-				.ifnum = -1
-			}
-		}
-	}
-},
 
 /* Access Music devices */
 {
@@ -3466,12 +3442,13 @@
 		.vendor_name = "Dell",
 		.product_name = "WD19 Dock",
 		.profile_name = "Dell-WD15-Dock",
-		.ifnum = QUIRK_NO_INTERFACE
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_SETUP_FMT_AFTER_RESUME
 	}
 },
 /* MOTU Microbook II */
 {
-	USB_DEVICE(0x07fd, 0x0004),
+	USB_DEVICE_VENDOR_SPEC(0x07fd, 0x0004),
 	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
 		.vendor_name = "MOTU",
 		.product_name = "MicroBookII",
@@ -3591,5 +3568,201 @@
 		}
 	}
 },
+{
+	/*
+	 * Pioneer DJ DJM-250MK2
+	 * PCM is 8 channels out @ 48 fixed (endpoints 0x01).
+	 * The output from computer to the mixer is usable.
+	 *
+	 * The input (phono or line to computer) is not working.
+	 * It should be at endpoint 0x82 and probably also 8 channels,
+	 * but it seems that it works only with Pioneer proprietary software.
+	 * Even on officially supported OS, the Audacity was unable to record
+	 * and Mixxx to recognize the control vinyls.
+	 */
+	USB_DEVICE_VENDOR_SPEC(0x2b73, 0x0017),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = (const struct snd_usb_audio_quirk[]) {
+			{
+				.ifnum = 0,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 8, // outputs
+					.iface = 0,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.endpoint = 0x01,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC|
+						USB_ENDPOINT_SYNC_ASYNC,
+					.rates = SNDRV_PCM_RATE_48000,
+					.rate_min = 48000,
+					.rate_max = 48000,
+					.nr_rates = 1,
+					.rate_table = (unsigned int[]) { 48000 }
+				}
+			},
+			{
+				.ifnum = -1
+			}
+		}
+	}
+},
+{
+	/*
+	 * PIONEER DJ DDJ-RB
+	 * PCM is 4 channels out, 2 dummy channels in @ 44.1 fixed
+	 * The feedback for the output is the dummy input.
+	 */
+	USB_DEVICE_VENDOR_SPEC(0x2b73, 0x000e),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = (const struct snd_usb_audio_quirk[]) {
+			{
+				.ifnum = 0,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 4,
+					.iface = 0,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.endpoint = 0x01,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC|
+						   USB_ENDPOINT_SYNC_ASYNC,
+					.rates = SNDRV_PCM_RATE_44100,
+					.rate_min = 44100,
+					.rate_max = 44100,
+					.nr_rates = 1,
+					.rate_table = (unsigned int[]) { 44100 }
+				}
+			},
+			{
+				.ifnum = 0,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 2,
+					.iface = 0,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.endpoint = 0x82,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC|
+						 USB_ENDPOINT_SYNC_ASYNC|
+						 USB_ENDPOINT_USAGE_IMPLICIT_FB,
+					.rates = SNDRV_PCM_RATE_44100,
+					.rate_min = 44100,
+					.rate_max = 44100,
+					.nr_rates = 1,
+					.rate_table = (unsigned int[]) { 44100 }
+				}
+			},
+			{
+				.ifnum = -1
+			}
+		}
+	}
+},
+
+#define ALC1220_VB_DESKTOP(vend, prod) { \
+	USB_DEVICE(vend, prod),	\
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) { \
+		.vendor_name = "Realtek", \
+		.product_name = "ALC1220-VB-DT", \
+		.profile_name = "Realtek-ALC1220-VB-Desktop", \
+		.ifnum = QUIRK_NO_INTERFACE \
+	} \
+}
+ALC1220_VB_DESKTOP(0x0414, 0xa002), /* Gigabyte TRX40 Aorus Pro WiFi */
+ALC1220_VB_DESKTOP(0x0db0, 0x0d64), /* MSI TRX40 Creator */
+ALC1220_VB_DESKTOP(0x0db0, 0x543d), /* MSI TRX40 */
+ALC1220_VB_DESKTOP(0x26ce, 0x0a01), /* Asrock TRX40 Creator */
+#undef ALC1220_VB_DESKTOP
+
+/* Two entries for Gigabyte TRX40 Aorus Master:
+ * TRX40 Aorus Master has two USB-audio devices, one for the front headphone
+ * with ESS SABRE9218 DAC chip, while another for the rest I/O (the rear
+ * panel and the front mic) with Realtek ALC1220-VB.
+ * Here we provide two distinct names for making UCM profiles easier.
+ */
+{
+	USB_DEVICE(0x0414, 0xa000),
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+		.vendor_name = "Gigabyte",
+		.product_name = "Aorus Master Front Headphone",
+		.profile_name = "Gigabyte-Aorus-Master-Front-Headphone",
+		.ifnum = QUIRK_NO_INTERFACE
+	}
+},
+{
+	USB_DEVICE(0x0414, 0xa001),
+	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+		.vendor_name = "Gigabyte",
+		.product_name = "Aorus Master Main Audio",
+		.profile_name = "Gigabyte-Aorus-Master-Main-Audio",
+		.ifnum = QUIRK_NO_INTERFACE
+	}
+},
+
+/*
+ * MacroSilicon MS2109 based HDMI capture cards
+ *
+ * These claim 96kHz 1ch in the descriptors, but are actually 48kHz 2ch.
+ * They also need QUIRK_AUDIO_ALIGN_TRANSFER, which makes one wonder if
+ * they pretend to be 96kHz mono as a workaround for stereo being broken
+ * by that...
+ *
+ * They also have an issue with initial stream alignment that causes the
+ * channels to be swapped and out of phase, which is dealt with in quirks.c.
+ */
+{
+	.match_flags = USB_DEVICE_ID_MATCH_DEVICE |
+		       USB_DEVICE_ID_MATCH_INT_CLASS |
+		       USB_DEVICE_ID_MATCH_INT_SUBCLASS,
+	.idVendor = 0x534d,
+	.idProduct = 0x2109,
+	.bInterfaceClass = USB_CLASS_AUDIO,
+	.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.vendor_name = "MacroSilicon",
+		.product_name = "MS2109",
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = &(const struct snd_usb_audio_quirk[]) {
+			{
+				.ifnum = 2,
+				.type = QUIRK_AUDIO_ALIGN_TRANSFER,
+			},
+			{
+				.ifnum = 2,
+				.type = QUIRK_AUDIO_STANDARD_MIXER,
+			},
+			{
+				.ifnum = 3,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S16_LE,
+					.channels = 2,
+					.iface = 3,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.attributes = 0,
+					.endpoint = 0x82,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC |
+						USB_ENDPOINT_SYNC_ASYNC,
+					.rates = SNDRV_PCM_RATE_CONTINUOUS,
+					.rate_min = 48000,
+					.rate_max = 48000,
+				}
+			},
+			{
+				.ifnum = -1
+			}
+		}
+	}
+},
 
 #undef USB_DEVICE_VENDOR_SPEC
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 349e1e5..d5d8288 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -55,8 +55,12 @@
 		if (!iface)
 			continue;
 		if (quirk->ifnum != probed_ifnum &&
-		    !usb_interface_claimed(iface))
-			usb_driver_claim_interface(driver, iface, (void *)-1L);
+		    !usb_interface_claimed(iface)) {
+			err = usb_driver_claim_interface(driver, iface,
+							 USB_AUDIO_IFACE_UNUSED);
+			if (err < 0)
+				return err;
+		}
 	}
 
 	return 0;
@@ -390,8 +394,12 @@
 			continue;
 
 		err = create_autodetect_quirk(chip, iface, driver);
-		if (err >= 0)
-			usb_driver_claim_interface(driver, iface, (void *)-1L);
+		if (err >= 0) {
+			err = usb_driver_claim_interface(driver, iface,
+							 USB_AUDIO_IFACE_UNUSED);
+			if (err < 0)
+				return err;
+		}
 	}
 
 	return 0;
@@ -508,6 +516,16 @@
 	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
 }
 
+
+static int setup_fmt_after_resume_quirk(struct snd_usb_audio *chip,
+				       struct usb_interface *iface,
+				       struct usb_driver *driver,
+				       const struct snd_usb_audio_quirk *quirk)
+{
+	chip->setup_fmt_after_resume_quirk = 1;
+	return 1;	/* Continue with creating streams and mixer */
+}
+
 /*
  * audio-interface quirks
  *
@@ -546,6 +564,7 @@
 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
 		[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
+		[QUIRK_SETUP_FMT_AFTER_RESUME] = setup_fmt_after_resume_quirk,
 	};
 
 	if (quirk->type < QUIRK_TYPE_COUNT) {
@@ -1102,6 +1121,31 @@
 	return err;
 }
 
+static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev)
+{
+	int ret;
+
+	if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
+		return -EINVAL;
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			      0x0, 0, NULL, 0, 1000);
+
+	if (ret < 0)
+		return ret;
+
+	msleep(2000);
+
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			      0x20, 0, NULL, 0, 1000);
+
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 /*
  * Setup quirks
  */
@@ -1280,7 +1324,28 @@
 	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx 3 */
 		return snd_usb_axefx3_boot_quirk(dev);
 	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
-		return snd_usb_motu_microbookii_boot_quirk(dev);
+		/*
+		 * For some reason interface 3 with vendor-spec class is
+		 * detected on MicroBook IIc.
+		 */
+		if (get_iface_desc(intf->altsetting)->bInterfaceClass ==
+		    USB_CLASS_VENDOR_SPEC &&
+		    get_iface_desc(intf->altsetting)->bInterfaceNumber < 3)
+			return snd_usb_motu_microbookii_boot_quirk(dev);
+		break;
+	}
+
+	return 0;
+}
+
+int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
+				  struct usb_interface *intf,
+				  const struct snd_usb_audio_quirk *quirk,
+				  unsigned int id)
+{
+	switch (id) {
+	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
+		return snd_usb_motu_m_series_boot_quirk(dev);
 	}
 
 	return 0;
@@ -1375,6 +1440,9 @@
 	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
 		set_format_emu_quirk(subs, fmt);
 		break;
+	case USB_ID(0x534d, 0x2109): /* MacroSilicon MS2109 */
+		subs->stream_offset_adj = 2;
+		break;
 	}
 }
 
@@ -1386,10 +1454,14 @@
 	case USB_ID(0x04D8, 0xFEEA): /* Benchmark DAC1 Pre */
 	case USB_ID(0x0556, 0x0014): /* Phoenix Audio TMX320VC */
 	case USB_ID(0x05A3, 0x9420): /* ELP HD USB Camera */
+	case USB_ID(0x05a7, 0x1020): /* Bose Companion 5 */
 	case USB_ID(0x074D, 0x3553): /* Outlaw RR2150 (Micronas UAC3553B) */
 	case USB_ID(0x1395, 0x740a): /* Sennheiser DECT */
 	case USB_ID(0x1901, 0x0191): /* GE B850V3 CP2114 audio interface */
 	case USB_ID(0x21B4, 0x0081): /* AudioQuest DragonFly */
+	case USB_ID(0x2912, 0x30c8): /* Audioengine D1 */
+	case USB_ID(0x413c, 0xa506): /* Dell AE515 sound bar */
+	case USB_ID(0x046d, 0x084c): /* Logitech ConferenceCam Connect */
 		return true;
 	}
 
@@ -1410,6 +1482,7 @@
 static bool is_itf_usb_dsd_dac(unsigned int id)
 {
 	switch (id) {
+	case USB_ID(0x154e, 0x1002): /* Denon DCD-1500RE */
 	case USB_ID(0x154e, 0x1003): /* Denon DA-300USB */
 	case USB_ID(0x154e, 0x3005): /* Marantz HD-DAC1 */
 	case USB_ID(0x154e, 0x3006): /* Marantz SA-14S1 */
@@ -1541,15 +1614,33 @@
 	    && (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
 		msleep(20);
 
-	/* Zoom R16/24, Logitech H650e, Jabra 550a needs a tiny delay here,
-	 * otherwise requests like get/set frequency return as failed despite
-	 * actually succeeding.
+	/*
+	 * Plantronics headsets (C320, C320-M, etc) need a delay to avoid
+	 * random microhpone failures.
+	 */
+	if (USB_ID_VENDOR(chip->usb_id) == 0x047f &&
+	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
+		msleep(20);
+
+	/* Zoom R16/24, many Logitech(at least H650e/H570e/BCC950),
+	 * Jabra 550a, Kingston HyperX needs a tiny delay here,
+	 * otherwise requests like get/set frequency return
+	 * as failed despite actually succeeding.
 	 */
 	if ((chip->usb_id == USB_ID(0x1686, 0x00dd) ||
-	     chip->usb_id == USB_ID(0x046d, 0x0a46) ||
-	     chip->usb_id == USB_ID(0x0b0e, 0x0349)) &&
+	     USB_ID_VENDOR(chip->usb_id) == 0x046d  || /* Logitech */
+	     chip->usb_id == USB_ID(0x0b0e, 0x0349) ||
+	     chip->usb_id == USB_ID(0x0951, 0x16ad)) &&
 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
 		usleep_range(1000, 2000);
+
+	/*
+	 * Samsung USBC Headset (AKG) need a tiny delay after each
+	 * class compliant request. (Model number: AAM625R or AAM627R)
+	 */
+	if (chip->usb_id == USB_ID(0x04e8, 0xa051) &&
+	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
+		usleep_range(5000, 6000);
 }
 
 /*
@@ -1592,7 +1683,7 @@
 
 	case USB_ID(0x0d8c, 0x0316): /* Hegel HD12 DSD */
 	case USB_ID(0x10cb, 0x0103): /* The Bit Opus #3; with fp->dsd_raw */
-	case USB_ID(0x16b0, 0x06b2): /* NuPrime DAC-10 */
+	case USB_ID(0x16d0, 0x06b2): /* NuPrime DAC-10 */
 	case USB_ID(0x16d0, 0x09dd): /* Encore mDSD */
 	case USB_ID(0x16d0, 0x0733): /* Furutech ADL Stratos */
 	case USB_ID(0x16d0, 0x09db): /* NuPrime Audio DAC-9 */
@@ -1658,7 +1749,9 @@
 	case 0x25ce:  /* Mytek devices */
 	case 0x278b:  /* Rotel? */
 	case 0x292b:  /* Gustard/Ess based devices */
+	case 0x2972:  /* FiiO devices */
 	case 0x2ab6:  /* T+A devices */
+	case 0x3353:  /* Khadas devices */
 	case 0x3842:  /* EVGA */
 	case 0xc502:  /* HiBy devices */
 		if (fp->dsd_raw)
@@ -1703,5 +1796,67 @@
 		else
 			fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
 		break;
+	case USB_ID(0x07fd, 0x0004):  /* MOTU MicroBook IIc */
+		/*
+		 * MaxPacketsOnly attribute is erroneously set in endpoint
+		 * descriptors. As a result this card produces noise with
+		 * all sample rates other than 96 KHz.
+		 */
+		fp->attributes &= ~UAC_EP_CS_ATTR_FILL_MAX;
+		break;
+	case USB_ID(0x1235, 0x8202):  /* Focusrite Scarlett 2i2 2nd gen */
+	case USB_ID(0x1235, 0x8205):  /* Focusrite Scarlett Solo 2nd gen */
+		/*
+		 * Reports that playback should use Synch: Synchronous
+		 * while still providing a feedback endpoint.
+		 * Synchronous causes snapping on some sample rates.
+		 * Force it to use Synch: Asynchronous.
+		 */
+		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
+			fp->ep_attr |= USB_ENDPOINT_SYNC_ASYNC;
+		}
+		break;
 	}
 }
+
+/*
+ * registration quirk:
+ * the registration is skipped if a device matches with the given ID,
+ * unless the interface reaches to the defined one.  This is for delaying
+ * the registration until the last known interface, so that the card and
+ * devices appear at the same time.
+ */
+
+struct registration_quirk {
+	unsigned int usb_id;	/* composed via USB_ID() */
+	unsigned int interface;	/* the interface to trigger register */
+};
+
+#define REG_QUIRK_ENTRY(vendor, product, iface) \
+	{ .usb_id = USB_ID(vendor, product), .interface = (iface) }
+
+static const struct registration_quirk registration_quirks[] = {
+	REG_QUIRK_ENTRY(0x0951, 0x16d8, 2),	/* Kingston HyperX AMP */
+	REG_QUIRK_ENTRY(0x0951, 0x16ed, 2),	/* Kingston HyperX Cloud Alpha S */
+	REG_QUIRK_ENTRY(0x0951, 0x16ea, 2),	/* Kingston HyperX Cloud Flight S */
+	REG_QUIRK_ENTRY(0x0ecb, 0x1f46, 2),	/* JBL Quantum 600 */
+	REG_QUIRK_ENTRY(0x0ecb, 0x1f47, 2),	/* JBL Quantum 800 */
+	REG_QUIRK_ENTRY(0x0ecb, 0x2039, 2),	/* JBL Quantum 400 */
+	REG_QUIRK_ENTRY(0x0ecb, 0x203c, 2),	/* JBL Quantum 600 */
+	REG_QUIRK_ENTRY(0x0ecb, 0x203e, 2),	/* JBL Quantum 800 */
+	{ 0 }					/* terminator */
+};
+
+/* return true if skipping registration */
+bool snd_usb_registration_quirk(struct snd_usb_audio *chip, int iface)
+{
+	const struct registration_quirk *q;
+
+	for (q = registration_quirks; q->usb_id; q++)
+		if (chip->usb_id == q->usb_id)
+			return iface != q->interface;
+
+	/* Register as normal */
+	return false;
+}
diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
index a80e0dd..c76cf24 100644
--- a/sound/usb/quirks.h
+++ b/sound/usb/quirks.h
@@ -20,6 +20,11 @@
 			     const struct snd_usb_audio_quirk *quirk,
 			     unsigned int usb_id);
 
+int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
+				  struct usb_interface *intf,
+				  const struct snd_usb_audio_quirk *quirk,
+				  unsigned int usb_id);
+
 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 			      struct audioformat *fmt);
 
@@ -46,4 +51,6 @@
 					  struct audioformat *fp,
 					  int stream);
 
+bool snd_usb_registration_quirk(struct snd_usb_audio *chip, int iface);
+
 #endif /* __USBAUDIO_QUIRKS_H */
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 11785f9..eff1ac1 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -94,6 +94,7 @@
 	subs->tx_length_quirk = as->chip->tx_length_quirk;
 	subs->speed = snd_usb_get_speed(subs->dev);
 	subs->pkt_offset_adj = 0;
+	subs->stream_offset_adj = 0;
 
 	snd_usb_set_pcm_ops(as->pcm, stream);
 
@@ -192,16 +193,16 @@
 	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 	struct snd_usb_substream *subs = info->private_data;
 	struct snd_pcm_chmap_elem *chmap = NULL;
-	int i;
+	int i = 0;
 
-	memset(ucontrol->value.integer.value, 0,
-	       sizeof(ucontrol->value.integer.value));
 	if (subs->cur_audiofmt)
 		chmap = subs->cur_audiofmt->chmap;
 	if (chmap) {
 		for (i = 0; i < chmap->channels; i++)
 			ucontrol->value.integer.value[i] = chmap->map[i];
 	}
+	for (; i < subs->channels_max; i++)
+		ucontrol->value.integer.value[i] = 0;
 	return 0;
 }
 
@@ -239,7 +240,7 @@
 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 						int protocol)
 {
-	static unsigned int uac1_maps[] = {
+	static const unsigned int uac1_maps[] = {
 		SNDRV_CHMAP_FL,		/* left front */
 		SNDRV_CHMAP_FR,		/* right front */
 		SNDRV_CHMAP_FC,		/* center front */
@@ -254,7 +255,7 @@
 		SNDRV_CHMAP_TC,		/* top */
 		0 /* terminator */
 	};
-	static unsigned int uac2_maps[] = {
+	static const unsigned int uac2_maps[] = {
 		SNDRV_CHMAP_FL,		/* front left */
 		SNDRV_CHMAP_FR,		/* front right */
 		SNDRV_CHMAP_FC,		/* front center */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index feb30f9..ff97fdc 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -26,14 +26,14 @@
 	struct usb_interface *pm_intf;
 	u32 usb_id;
 	struct mutex mutex;
-	unsigned int autosuspended:1;	
+	unsigned int system_suspend;
 	atomic_t active;
 	atomic_t shutdown;
 	atomic_t usage_count;
 	wait_queue_head_t shutdown_wait;
 	unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
 	unsigned int tx_length_quirk:1; /* Put length specifier in transfers */
-	
+	unsigned int setup_fmt_after_resume_quirk:1; /* setup the format to interface after resume */
 	int num_interfaces;
 	int num_suspended_intf;
 	int sample_rate_read_error;
@@ -59,6 +59,8 @@
 	struct media_intf_devnode *ctl_intf_media_devnode;
 };
 
+#define USB_AUDIO_IFACE_UNUSED	((void *)-1L)
+
 #define usb_audio_err(chip, fmt, args...) \
 	dev_err(&(chip)->dev->dev, fmt, ##args)
 #define usb_audio_warn(chip, fmt, args...) \
@@ -98,6 +100,7 @@
 	QUIRK_AUDIO_EDIROL_UAXX,
 	QUIRK_AUDIO_ALIGN_TRANSFER,
 	QUIRK_AUDIO_STANDARD_MIXER,
+	QUIRK_SETUP_FMT_AFTER_RESUME,
 
 	QUIRK_TYPE_COUNT
 };
diff --git a/sound/usb/usx2y/usX2Yhwdep.c b/sound/usb/usx2y/usX2Yhwdep.c
index d1caa8e..9985fc1 100644
--- a/sound/usb/usx2y/usX2Yhwdep.c
+++ b/sound/usb/usx2y/usX2Yhwdep.c
@@ -119,7 +119,7 @@
 	info->num_dsps = 2;		// 0: Prepad Data, 1: FPGA Code
 	if (us428->chip_status & USX2Y_STAT_CHIP_INIT)
 		info->chip_ready = 1;
- 	info->version = USX2Y_DRIVER_VERSION; 
+	info->version = USX2Y_DRIVER_VERSION;
 	return 0;
 }
 
diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
index 091c071..cff6849 100644
--- a/sound/usb/usx2y/usb_stream.c
+++ b/sound/usb/usx2y/usb_stream.c
@@ -142,8 +142,11 @@
 	if (!s)
 		return;
 
-	free_pages_exact(sk->write_page, s->write_size);
-	sk->write_page = NULL;
+	if (sk->write_page) {
+		free_pages_exact(sk->write_page, s->write_size);
+		sk->write_page = NULL;
+	}
+
 	free_pages_exact(s, s->read_size);
 	sk->s = NULL;
 }
diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
index 89fa287..e0bace4 100644
--- a/sound/usb/usx2y/usbusx2yaudio.c
+++ b/sound/usb/usx2y/usbusx2yaudio.c
@@ -681,6 +681,8 @@
 			us->submitted =	2*NOOF_SETRATE_URBS;
 			for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
 				struct urb *urb = us->urb[i];
+				if (!urb)
+					continue;
 				if (urb->status) {
 					if (!err)
 						err = -ENODEV;
diff --git a/sound/usb/validate.c b/sound/usb/validate.c
index 389e865..89a48d7 100644
--- a/sound/usb/validate.c
+++ b/sound/usb/validate.c
@@ -110,7 +110,7 @@
 	default:
 		if (v->type == UAC1_EXTENSION_UNIT)
 			return true; /* OK */
-		switch (d->wProcessType) {
+		switch (le16_to_cpu(d->wProcessType)) {
 		case UAC_PROCESS_UP_DOWNMIX:
 		case UAC_PROCESS_DOLBY_PROLOGIC:
 			if (d->bLength < len + 1) /* bNrModes */
@@ -125,7 +125,7 @@
 	case UAC_VERSION_2:
 		if (v->type == UAC2_EXTENSION_UNIT_V2)
 			return true; /* OK */
-		switch (d->wProcessType) {
+		switch (le16_to_cpu(d->wProcessType)) {
 		case UAC2_PROCESS_UP_DOWNMIX:
 		case UAC2_PROCESS_DOLBY_PROLOCIC: /* SiC! */
 			if (d->bLength < len + 1) /* bNrModes */
@@ -142,7 +142,7 @@
 			len += 2; /* wClusterDescrID */
 			break;
 		}
-		switch (d->wProcessType) {
+		switch (le16_to_cpu(d->wProcessType)) {
 		case UAC3_PROCESS_UP_DOWNMIX:
 			if (d->bLength < len + 1) /* bNrModes */
 				return false;
@@ -233,7 +233,7 @@
 #define FIXED(p, t, s) { .protocol = (p), .type = (t), .size = sizeof(s) }
 #define FUNC(p, t, f) { .protocol = (p), .type = (t), .func = (f) }
 
-static struct usb_desc_validator audio_validators[] = {
+static const struct usb_desc_validator audio_validators[] = {
 	/* UAC1 */
 	FUNC(UAC_VERSION_1, UAC_HEADER, validate_uac1_header),
 	FIXED(UAC_VERSION_1, UAC_INPUT_TERMINAL,
@@ -288,7 +288,7 @@
 	{ } /* terminator */
 };
 
-static struct usb_desc_validator midi_validators[] = {
+static const struct usb_desc_validator midi_validators[] = {
 	FIXED(UAC_VERSION_ALL, USB_MS_HEADER,
 	      struct usb_ms_header_descriptor),
 	FIXED(UAC_VERSION_ALL, USB_MS_MIDI_IN_JACK,