[PATCH v3] ALSA: usb-audio: Add sampling rates support for Mbox3

[PATCH v3] ALSA: usb-audio: Add sampling rates support for Mbox3

[Manuel Barrio Linares]

This adds support for all sample rates supported by the
hardware,Digidesign Mbox 3 supports: {44100, 48000, 88200, 96000}

Fixes syncing clock issues that presented as pops. To test this, without
this patch playing 440hz tone produces pops.

Clock is now synced between playback and capture interfaces so no more
latency drift issue when using pipewire pro-profile.
(https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3900)

Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>
---
v2: Cleaned up code. Explicit __le32 usage.
v3: Get rid of sparse warnings

 sound/usb/quirks-table.h | 38 +++++++++++++--------
 sound/usb/quirks.c       | 74 +++++++++++++++++++++++++++++++---------
 2 files changed, 81 insertions(+), 31 deletions(-)

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 5d72dc8..73abc38 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3013,21 +3013,28 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
 				.data = &(const struct audioformat) {
 					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.fmt_bits = 24,
 					.channels = 4,
 					.iface = 2,
 					.altsetting = 1,
 					.altset_idx = 1,
 					.attributes = 0x00,
-					.endpoint = 0x01,
+					.endpoint = USB_RECIP_INTERFACE | USB_DIR_OUT,
 					.ep_attr = USB_ENDPOINT_XFER_ISOC |
 						USB_ENDPOINT_SYNC_ASYNC,
-					.rates = SNDRV_PCM_RATE_48000,
-					.rate_min = 48000,
-					.rate_max = 48000,
-					.nr_rates = 1,
+					.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+							SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 4,
 					.rate_table = (unsigned int[]) {
-						48000
-					}
+						44100, 48000, 88200, 96000
+					},
+					.sync_ep = USB_RECIP_INTERFACE | USB_DIR_IN,
+					.sync_iface = 3,
+					.sync_altsetting = 1,
+					.sync_ep_idx = 1,
+					.implicit_fb = 1,
 				}
 			},
 			{
@@ -3035,22 +3042,25 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
 				.data = &(const struct audioformat) {
 					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.fmt_bits = 24,
 					.channels = 4,
 					.iface = 3,
 					.altsetting = 1,
 					.altset_idx = 1,
-					.endpoint = 0x81,
 					.attributes = 0x00,
+					.endpoint = USB_RECIP_INTERFACE | USB_DIR_IN,
 					.ep_attr = USB_ENDPOINT_XFER_ISOC |
 						USB_ENDPOINT_SYNC_ASYNC,
 					.maxpacksize = 0x009c,
-					.rates = SNDRV_PCM_RATE_48000,
-					.rate_min = 48000,
-					.rate_max = 48000,
-					.nr_rates = 1,
+					.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+							SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 4,
 					.rate_table = (unsigned int[]) {
-						48000
-					}
+						44100, 48000, 88200, 96000
+					},
+					.implicit_fb = 0,
 				}
 			},
 			{
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 09712e6..2f961f0 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -984,21 +984,13 @@ static int snd_usb_axefx3_boot_quirk(struct usb_device *dev)
 	return 0;
 }
 
-static void mbox3_setup_48_24_magic(struct usb_device *dev)
+static void mbox3_setup_defaults(struct usb_device *dev)
 {
 	/* The Mbox 3 is "little endian" */
 	/* max volume is: 0x0000. */
 	/* min volume is: 0x0080 (shown in little endian form) */
 
-
-	/* Load 48000Hz rate into buffer */
-	u8 com_buff[4] = {0x80, 0xbb, 0x00, 0x00};
-
-	/* Set 48000Hz sample rate */
-	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
-			0x01, 0x21, 0x0100, 0x0001, &com_buff, 4);  //Is this really needed?
-	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
-			0x01, 0x21, 0x0100, 0x8101, &com_buff, 4);
+	u8 com_buff[2];
 
 	/* Deactivate Tuner */
 	/* on  = 0x01*/
@@ -1008,6 +1000,8 @@ static void mbox3_setup_48_24_magic(struct usb_device *dev)
 		0x01, 0x21, 0x0003, 0x2001, &com_buff, 1);
 
 	/* Set clock source to Internal (as opposed to S/PDIF) */
+	/* Internal  = 0x01*/
+	/* S/PDIF    = 0x02*/
 	com_buff[0] = 0x01;
 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
 			1, 0x21, 0x0100, 0x8001, &com_buff, 1);
@@ -1113,9 +1107,11 @@ static void mbox3_setup_48_24_magic(struct usb_device *dev)
 			1, 0x21, 0x0107, 0x4201, &com_buff, 2);
 
 	/* Toggle allowing host control */
+	/* Not needed
 	com_buff[0] = 0x02;
 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
 			3, 0x21, 0x0000, 0x2001, &com_buff, 1);
+	 */
 
 	/* Do not dim fx returns */
 	com_buff[0] = 0x00;
@@ -1259,26 +1255,27 @@ static int snd_usb_mbox3_boot_quirk(struct usb_device *dev)
 	descriptor_size = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
 
 	if (descriptor_size != MBOX3_DESCRIPTOR_SIZE) {
-		dev_err(&dev->dev, "Invalid descriptor size=%d.\n", descriptor_size);
+		dev_err(&dev->dev, "MBOX3: Invalid descriptor size=%d.\n", descriptor_size);
 		return -ENODEV;
 	}
 
-	dev_dbg(&dev->dev, "device initialised!\n");
+	dev_dbg(&dev->dev, "MBOX3: device initialised!\n");
 
 	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 		&dev->descriptor, sizeof(dev->descriptor));
 	config = dev->actconfig;
 	if (err < 0)
-		dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
+		dev_dbg(&dev->dev, "MBOX3: error usb_get_descriptor: %d\n", err);
 
 	err = usb_reset_configuration(dev);
 	if (err < 0)
-		dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
-	dev_dbg(&dev->dev, "mbox3_boot: new boot length = %d\n",
+		dev_dbg(&dev->dev, "MBOX3: error usb_reset_configuration: %d\n", err);
+
+	dev_dbg(&dev->dev, "MBOX3: new boot length = %d\n",
 		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
 
-	mbox3_setup_48_24_magic(dev);
-	dev_info(&dev->dev, "Digidesign Mbox 3: 24bit 48kHz");
+	mbox3_setup_defaults(dev);
+	dev_info(&dev->dev, "MBOX3: Initialized.");
 
 	return 0; /* Successful boot */
 }
@@ -1734,6 +1731,46 @@ static int pioneer_djm_set_format_quirk(struct snd_usb_substream *subs,
 	return 0;
 }
 
+static void mbox3_set_format_quirk(struct snd_usb_substream *subs,
+				const struct audioformat *fmt)
+{
+	__le32 buff4 = 0;
+	u8 buff1 = 0x01;
+	u32 new_rate = subs->data_endpoint->cur_rate;
+	u32 current_rate;
+
+	// Get current rate from card and check if changing it is needed
+	snd_usb_ctl_msg(subs->dev, usb_sndctrlpipe(subs->dev, 0),
+					0x01, 0x21 | USB_DIR_IN, 0x0100, 0x8101, &buff4, 4);
+	current_rate = le32_to_cpu(buff4);
+	dev_dbg(&subs->dev->dev,
+			 "MBOX3: Current configured sample rate: %d", current_rate);
+	if (current_rate == new_rate) {
+		dev_dbg(&subs->dev->dev,
+			"MBOX3: No change needed (current rate:%d == new rate:%d)",
+			current_rate, new_rate);
+		return;
+	}
+
+	// Set new rate
+	dev_info(&subs->dev->dev,
+			 "MBOX3: Changing sample rate to: %d", new_rate);
+	buff4 = cpu_to_le32(new_rate);
+	snd_usb_ctl_msg(subs->dev, usb_sndctrlpipe(subs->dev, 0),
+					0x01, 0x21, 0x0100, 0x8101, &buff4, 4);
+
+	// Set clock source to Internal
+	snd_usb_ctl_msg(subs->dev, usb_sndctrlpipe(subs->dev, 0),
+					0x01, 0x21, 0x0100, 0x8001, &buff1, 1);
+
+	// Check whether the change was successful
+	buff4 = 0;
+	snd_usb_ctl_msg(subs->dev, usb_sndctrlpipe(subs->dev, 0),
+					0x01, 0x21 | USB_DIR_IN, 0x0100, 0x8101, &buff4, 4);
+	if (new_rate != le32_to_cpu(buff4))
+		dev_warn(&subs->dev->dev, "MBOX3: Couldn't set the sample rate");
+}
+
 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 			      const struct audioformat *fmt)
 {
@@ -1755,6 +1792,9 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 	case USB_ID(0x08e4, 0x0163): /* Pioneer DJM-850 */
 		pioneer_djm_set_format_quirk(subs, 0x0086);
 		break;
+	case USB_ID(0x0dba, 0x5000):
+		mbox3_set_format_quirk(subs, fmt); /* Digidesign Mbox 3 */
+		break;
 	}
 }
 
-- 
2.45.0

Re: [PATCH v3] ALSA: usb-audio: Add sampling rates support for Mbox3

[Takashi Iwai]

On Tue, 30 Apr 2024 19:10:18 +0200,
Manuel Barrio Linares wrote:
> 
> This adds support for all sample rates supported by the
> hardware,Digidesign Mbox 3 supports: {44100, 48000, 88200, 96000}
> 
> Fixes syncing clock issues that presented as pops. To test this, without
> this patch playing 440hz tone produces pops.
> 
> Clock is now synced between playback and capture interfaces so no more
> latency drift issue when using pipewire pro-profile.
> (https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3900)
> 
> Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>

Applied to for-next branch now.  Thanks!


Takashi

ALSA: usb-audio: Adding mixer controls to Mbox3

[Manu]

Thank you for all your help, Takashi!

I would like to add the hardware mixer controls for Mbox3.
I have already identified every control in the function "mbox3_setup_defaults"
of "quirks.c", but I am unsure about the structure needed to make the controls
appear in alsamixer (further investigation is required). I would appreciate any
help you or anyone else can provide.

Manuel Barrio Linares


On Wed, May 1, 2024 at 4:55 AM Takashi Iwai <tiwai@suse.de> wrote:
>
> On Tue, 30 Apr 2024 19:10:18 +0200,
> Manuel Barrio Linares wrote:
> >
> > This adds support for all sample rates supported by the
> > hardware,Digidesign Mbox 3 supports: {44100, 48000, 88200, 96000}
> >
> > Fixes syncing clock issues that presented as pops. To test this, without
> > this patch playing 440hz tone produces pops.
> >
> > Clock is now synced between playback and capture interfaces so no more
> > latency drift issue when using pipewire pro-profile.
> > (https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3900)
> >
> > Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>
>
> Applied to for-next branch now.  Thanks!
>
>
> Takashi

Re: ALSA: usb-audio: Adding mixer controls to Mbox3

[Takashi Iwai]

On Wed, 01 May 2024 16:31:35 +0200,
Manu wrote:
> 
> Thank you for all your help, Takashi!
> 
> I would like to add the hardware mixer controls for Mbox3.
> I have already identified every control in the function "mbox3_setup_defaults"
> of "quirks.c", but I am unsure about the structure needed to make the controls
> appear in alsamixer (further investigation is required). I would appreciate any
> help you or anyone else can provide.

I believe it'd be helpful if you can show some mock up or any examples
you wanted to try (or had in your head).  If the question was about
the complexity or too many code to add there, you can split to another
file, too.


thanks,

Takashi

> 
> Manuel Barrio Linares
> 
> 
> On Wed, May 1, 2024 at 4:55 AM Takashi Iwai <tiwai@suse.de> wrote:
> >
> > On Tue, 30 Apr 2024 19:10:18 +0200,
> > Manuel Barrio Linares wrote:
> > >
> > > This adds support for all sample rates supported by the
> > > hardware,Digidesign Mbox 3 supports: {44100, 48000, 88200, 96000}
> > >
> > > Fixes syncing clock issues that presented as pops. To test this, without
> > > this patch playing 440hz tone produces pops.
> > >
> > > Clock is now synced between playback and capture interfaces so no more
> > > latency drift issue when using pipewire pro-profile.
> > > (https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3900)
> > >
> > > Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>
> >
> > Applied to for-next branch now.  Thanks!
> >
> >
> > Takashi

[PATCH v4] ALSA: usb-audio: Add sampling rates support for Mbox3

[Manuel Barrio Linares]

This adds support for all sample rates supported by the hardware,
Digidesign Mbox 3 supports: {44100, 48000, 88200, 96000}

Fixes syncing clock issues that presented as pops. To test this, without
this patch playing 440hz tone produces pops.

Clock is now synced between playback and capture interfaces so no more
latency drift issue when using pipewire pro-profile.
(https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3900)

Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>
---
v2: Cleaned up code. Explicit __le32 usage.
v3: Get rid of sparse warnings
v4: Fixed wrong use of usb_sndctrlpipe to usb_rcvctrlpipe, lines 1743 and 1768

 sound/usb/quirks-table.h | 38 +++++++++++++--------
 sound/usb/quirks.c       | 74 +++++++++++++++++++++++++++++++---------
 2 files changed, 81 insertions(+), 31 deletions(-)

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 5d72dc8441cbb..73abc38a54006 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3013,21 +3013,28 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
 				.data = &(const struct audioformat) {
 					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.fmt_bits = 24,
 					.channels = 4,
 					.iface = 2,
 					.altsetting = 1,
 					.altset_idx = 1,
 					.attributes = 0x00,
-					.endpoint = 0x01,
+					.endpoint = USB_RECIP_INTERFACE | USB_DIR_OUT,
 					.ep_attr = USB_ENDPOINT_XFER_ISOC |
 						USB_ENDPOINT_SYNC_ASYNC,
-					.rates = SNDRV_PCM_RATE_48000,
-					.rate_min = 48000,
-					.rate_max = 48000,
-					.nr_rates = 1,
+					.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+							SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 4,
 					.rate_table = (unsigned int[]) {
-						48000
-					}
+						44100, 48000, 88200, 96000
+					},
+					.sync_ep = USB_RECIP_INTERFACE | USB_DIR_IN,
+					.sync_iface = 3,
+					.sync_altsetting = 1,
+					.sync_ep_idx = 1,
+					.implicit_fb = 1,
 				}
 			},
 			{
@@ -3035,22 +3042,25 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
 				.data = &(const struct audioformat) {
 					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.fmt_bits = 24,
 					.channels = 4,
 					.iface = 3,
 					.altsetting = 1,
 					.altset_idx = 1,
-					.endpoint = 0x81,
 					.attributes = 0x00,
+					.endpoint = USB_RECIP_INTERFACE | USB_DIR_IN,
 					.ep_attr = USB_ENDPOINT_XFER_ISOC |
 						USB_ENDPOINT_SYNC_ASYNC,
 					.maxpacksize = 0x009c,
-					.rates = SNDRV_PCM_RATE_48000,
-					.rate_min = 48000,
-					.rate_max = 48000,
-					.nr_rates = 1,
+					.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+							SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 4,
 					.rate_table = (unsigned int[]) {
-						48000
-					}
+						44100, 48000, 88200, 96000
+					},
+					.implicit_fb = 0,
 				}
 			},
 			{
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 09712e61c606e..58156fbca02c7 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -984,21 +984,13 @@ static int snd_usb_axefx3_boot_quirk(struct usb_device *dev)
 	return 0;
 }
 
-static void mbox3_setup_48_24_magic(struct usb_device *dev)
+static void mbox3_setup_defaults(struct usb_device *dev)
 {
 	/* The Mbox 3 is "little endian" */
 	/* max volume is: 0x0000. */
 	/* min volume is: 0x0080 (shown in little endian form) */
 
-
-	/* Load 48000Hz rate into buffer */
-	u8 com_buff[4] = {0x80, 0xbb, 0x00, 0x00};
-
-	/* Set 48000Hz sample rate */
-	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
-			0x01, 0x21, 0x0100, 0x0001, &com_buff, 4);  //Is this really needed?
-	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
-			0x01, 0x21, 0x0100, 0x8101, &com_buff, 4);
+	u8 com_buff[2];
 
 	/* Deactivate Tuner */
 	/* on  = 0x01*/
@@ -1008,6 +1000,8 @@ static void mbox3_setup_48_24_magic(struct usb_device *dev)
 		0x01, 0x21, 0x0003, 0x2001, &com_buff, 1);
 
 	/* Set clock source to Internal (as opposed to S/PDIF) */
+	/* Internal  = 0x01*/
+	/* S/PDIF    = 0x02*/
 	com_buff[0] = 0x01;
 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
 			1, 0x21, 0x0100, 0x8001, &com_buff, 1);
@@ -1113,9 +1107,11 @@ static void mbox3_setup_48_24_magic(struct usb_device *dev)
 			1, 0x21, 0x0107, 0x4201, &com_buff, 2);
 
 	/* Toggle allowing host control */
+	/* Not needed
 	com_buff[0] = 0x02;
 	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
 			3, 0x21, 0x0000, 0x2001, &com_buff, 1);
+	 */
 
 	/* Do not dim fx returns */
 	com_buff[0] = 0x00;
@@ -1259,26 +1255,27 @@ static int snd_usb_mbox3_boot_quirk(struct usb_device *dev)
 	descriptor_size = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
 
 	if (descriptor_size != MBOX3_DESCRIPTOR_SIZE) {
-		dev_err(&dev->dev, "Invalid descriptor size=%d.\n", descriptor_size);
+		dev_err(&dev->dev, "MBOX3: Invalid descriptor size=%d.\n", descriptor_size);
 		return -ENODEV;
 	}
 
-	dev_dbg(&dev->dev, "device initialised!\n");
+	dev_dbg(&dev->dev, "MBOX3: device initialised!\n");
 
 	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 		&dev->descriptor, sizeof(dev->descriptor));
 	config = dev->actconfig;
 	if (err < 0)
-		dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
+		dev_dbg(&dev->dev, "MBOX3: error usb_get_descriptor: %d\n", err);
 
 	err = usb_reset_configuration(dev);
 	if (err < 0)
-		dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
-	dev_dbg(&dev->dev, "mbox3_boot: new boot length = %d\n",
+		dev_dbg(&dev->dev, "MBOX3: error usb_reset_configuration: %d\n", err);
+
+	dev_dbg(&dev->dev, "MBOX3: new boot length = %d\n",
 		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
 
-	mbox3_setup_48_24_magic(dev);
-	dev_info(&dev->dev, "Digidesign Mbox 3: 24bit 48kHz");
+	mbox3_setup_defaults(dev);
+	dev_info(&dev->dev, "MBOX3: Initialized.");
 
 	return 0; /* Successful boot */
 }
@@ -1734,6 +1731,46 @@ static int pioneer_djm_set_format_quirk(struct snd_usb_substream *subs,
 	return 0;
 }
 
+static void mbox3_set_format_quirk(struct snd_usb_substream *subs,
+				const struct audioformat *fmt)
+{
+	__le32 buff4 = 0;
+	u8 buff1 = 0x01;
+	u32 new_rate = subs->data_endpoint->cur_rate;
+	u32 current_rate;
+
+	// Get current rate from card and check if changing it is needed
+	snd_usb_ctl_msg(subs->dev, usb_rcvctrlpipe(subs->dev, 0),
+					0x01, 0x21 | USB_DIR_IN, 0x0100, 0x8101, &buff4, 4);
+	current_rate = le32_to_cpu(buff4);
+	dev_dbg(&subs->dev->dev,
+			 "MBOX3: Current configured sample rate: %d", current_rate);
+	if (current_rate == new_rate) {
+		dev_dbg(&subs->dev->dev,
+			"MBOX3: No change needed (current rate:%d == new rate:%d)",
+			current_rate, new_rate);
+		return;
+	}
+
+	// Set new rate
+	dev_info(&subs->dev->dev,
+			 "MBOX3: Changing sample rate to: %d", new_rate);
+	buff4 = cpu_to_le32(new_rate);
+	snd_usb_ctl_msg(subs->dev, usb_sndctrlpipe(subs->dev, 0),
+					0x01, 0x21, 0x0100, 0x8101, &buff4, 4);
+
+	// Set clock source to Internal
+	snd_usb_ctl_msg(subs->dev, usb_sndctrlpipe(subs->dev, 0),
+					0x01, 0x21, 0x0100, 0x8001, &buff1, 1);
+
+	// Check whether the change was successful
+	buff4 = 0;
+	snd_usb_ctl_msg(subs->dev, usb_rcvctrlpipe(subs->dev, 0),
+					0x01, 0x21 | USB_DIR_IN, 0x0100, 0x8101, &buff4, 4);
+	if (new_rate != le32_to_cpu(buff4))
+		dev_warn(&subs->dev->dev, "MBOX3: Couldn't set the sample rate");
+}
+
 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 			      const struct audioformat *fmt)
 {
@@ -1755,6 +1792,9 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 	case USB_ID(0x08e4, 0x0163): /* Pioneer DJM-850 */
 		pioneer_djm_set_format_quirk(subs, 0x0086);
 		break;
+	case USB_ID(0x0dba, 0x5000):
+		mbox3_set_format_quirk(subs, fmt); /* Digidesign Mbox 3 */
+		break;
 	}
 }
 
-- 
2.45.0