3 files changed, 6 insertions, 1 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 314e8a211c9a..5254b18cedcd 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -82,6 +82,7 @@ static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
 static int nrpacks = 8;         /* max. number of packets per urb */
 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
 static bool ignore_ctl_error;
+static bool autoclock = true;
 
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
@@ -100,6 +101,8 @@ MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 module_param(ignore_ctl_error, bool, 0444);
 MODULE_PARM_DESC(ignore_ctl_error,
                  "Ignore errors from USB controller for mixer interfaces.");
+module_param(autoclock, bool, 0444);
+MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
 
 /*
  * we keep the snd_usb_audio_t instances by ourselves for merging
@@ -354,6 +357,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
         chip->card = card;
         chip->setup = device_setup[idx];
         chip->nrpacks = nrpacks;
+        chip->autoclock = autoclock;
         chip->probing = 1;
 
         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index d7ab2d75aefd..e59d359b907c 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -217,7 +217,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
                 cur = ret;
                 ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
                                                visited, validate);
-                if (!validate || ret > 0)
+                if (!validate || ret > 0 || !chip->autoclock)
                         return ret;
 
                 /* The current clock source is invalid, try others. */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 1ac3fd9cc5a6..bc43bcaddf4d 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -56,6 +56,7 @@ struct snd_usb_audio {
 
         int setup;                      /* from the 'device_setup' module param */
         int nrpacks;                    /* from the 'nrpacks' module param */
+        bool autoclock;                 /* from the 'autoclock' module param */
 
         struct usb_host_interface *ctrl_intf;   /* the audio control interface */
 };