Merge branch 'for-linus' into for-next

1 files changed, 16 insertions, 6 deletions

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index f6c3bf79af9a..04991b009132 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -1831,6 +1831,7 @@ void snd_usb_mixer_rc_memory_change(struct usb_mixer_interface *mixer,
 }
 
 static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
+                                         struct usb_mixer_elem_info *cval,
                                          struct snd_kcontrol *kctl)
 {
         /* Approximation using 10 ranges based on output measurement on hw v1.2.
@@ -1848,10 +1849,19 @@ static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
                 41, 50, TLV_DB_MINMAX_ITEM(-441, 0),
         );
 
-        usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk\n");
-        kctl->tlv.p = scale;
-        kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
-        kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+        if (cval->min == 0 && cval->max == 50) {
+                usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk (0-50 variant)\n");
+                kctl->tlv.p = scale;
+                kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
+                kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+
+        } else if (cval->min == 0 && cval->max <= 1000) {
+                /* Some other clearly broken DragonFly variant.
+                 * At least a 0..53 variant (hw v1.0) exists.
+                 */
+                usb_audio_info(mixer->chip, "ignoring too narrow dB range on a DragonFly device");
+                kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+        }
 }
 
 void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
@@ -1860,8 +1870,8 @@ void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
 {
         switch (mixer->chip->usb_id) {
         case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */
-                if (unitid == 7 && cval->min == 0 && cval->max == 50)
-                        snd_dragonfly_quirk_db_scale(mixer, kctl);
+                if (unitid == 7 && cval->control == UAC_FU_VOLUME)
+                        snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
                 break;
         }
 }