[PATCH] ALSA: usb-audio: move mixer_quirks' min_mute into common quirk

[PATCH] ALSA: usb-audio: move mixer_quirks' min_mute into common quirk

[Cryolitia PukNgae via B4 Relay]

From: Cryolitia PukNgae <cryolitia@uniontech.com>

We have found more and more devices that have the same problem, that
the mixer's minimum value is muted. Accroding to pipewire's MR[1]
and Arch Linux wiki[2], this should be a very common problem in USB
audio devices. Move the quirk into common quirk,as a preparation of
more devices' quirk's patch coming on the road[3].

1. https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2514
2. https://wiki.archlinux.org/index.php?title=PipeWire&oldid=804138#No_sound_from_USB_DAC_until_30%_volume
3. On the road, in the physical sense. We have been buying ton of
   these devices for testing the problem.

Tested-by: Guoli An <anguoli@uniontech.com>
Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
---
I also would like to know if the quirk worth a kernel param.
---
 sound/usb/mixer_quirks.c | 10 +++-------
 sound/usb/quirks.c       | 12 ++++++++++--
 sound/usb/usbaudio.h     |  4 ++++
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 48e8c2014f0f27406ddca29f36e8b1d03be92f31..b8275c81802e60314ee483a31a0fcb7306b24c76 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -4540,16 +4540,12 @@ void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
 		if (unitid == 7 && cval->control == UAC_FU_VOLUME)
 			snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
 		break;
+	}
+
 	/* lowest playback value is muted on some devices */
-	case USB_ID(0x0572, 0x1b09): /* Conexant Systems (Rockwell), Inc. */
-	case USB_ID(0x0d8c, 0x000c): /* C-Media */
-	case USB_ID(0x0d8c, 0x0014): /* C-Media */
-	case USB_ID(0x19f7, 0x0003): /* RODE NT-USB */
-	case USB_ID(0x2d99, 0x0026): /* HECATE G2 GAMING HEADSET */
+	if (mixer->chip->quirk_flags & QUIRK_FLAG_MIXER_MIN_MUTE)
 		if (strstr(kctl->id.name, "Playback"))
 			cval->min_mute = 1;
-		break;
-	}
 
 	/* ALSA-ify some Plantronics headset control names */
 	if (USB_ID_VENDOR(mixer->chip->usb_id) == 0x047f &&
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index e75b0b1df6eb2120b1446b7bd54f3ba50a79f567..8bc1e247cdf1af0a3e9c506830d8428a86c25595 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2199,6 +2199,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_SET_IFACE_FIRST),
 	DEVICE_FLG(0x0556, 0x0014, /* Phoenix Audio TMX320VC */
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
+	DEVICE_FLG(0x0572, 0x1b09, /* Conexant Systems (Rockwell), Inc. */
+		   QUIRK_FLAG_MIXER_MIN_MUTE),
 	DEVICE_FLG(0x05a3, 0x9420, /* ELP HD USB Camera */
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
 	DEVICE_FLG(0x05a7, 0x1020, /* Bose Companion 5 */
@@ -2245,8 +2247,10 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
 	DEVICE_FLG(0x0c45, 0x636b, /* Microdia JP001 USB Camera */
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
-	DEVICE_FLG(0x0d8c, 0x0014, /* USB Audio Device */
-		   QUIRK_FLAG_CTL_MSG_DELAY_1M),
+	DEVICE_FLG(0x0d8c, 0x000c, /* C-Media */
+		   QUIRK_FLAG_MIXER_MIN_MUTE),
+	DEVICE_FLG(0x0d8c, 0x0014, /* C-Media */
+		   QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIXER_MIN_MUTE),
 	DEVICE_FLG(0x0ecb, 0x205c, /* JBL Quantum610 Wireless */
 		   QUIRK_FLAG_FIXED_RATE),
 	DEVICE_FLG(0x0ecb, 0x2069, /* JBL Quantum810 Wireless */
@@ -2293,6 +2297,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY),
 	DEVICE_FLG(0x1901, 0x0191, /* GE B850V3 CP2114 audio interface */
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
+	DEVICE_FLG(0x19f7, 0x0003, /* RODE NT-USB */
+		   QUIRK_FLAG_MIXER_MIN_MUTE),
 	DEVICE_FLG(0x19f7, 0x0035, /* RODE NT-USB+ */
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
 	DEVICE_FLG(0x1bcf, 0x2281, /* HD Webcam */
@@ -2353,6 +2359,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_CTL_MSG_DELAY_1M),
 	DEVICE_FLG(0x2d95, 0x8021, /* VIVO USB-C-XE710 HEADSET */
 		   QUIRK_FLAG_CTL_MSG_DELAY_1M),
+	DEVICE_FLG(0x2d99, 0x0026, /* HECATE G2 GAMING HEADSET */
+		   QUIRK_FLAG_MIXER_MIN_MUTE),
 	DEVICE_FLG(0x2fc6, 0xf0b7, /* iBasso DC07 Pro */
 		   QUIRK_FLAG_CTL_MSG_DELAY_1M),
 	DEVICE_FLG(0x30be, 0x0101, /* Schiit Hel */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 7521098ba391c04a83c2b6b6180c88c52ac6c5dc..59335b94103004b900285e4990b971d74bf37532 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -219,6 +219,9 @@ extern bool snd_usb_skip_validation;
  *  for the given endpoint.
  * QUIRK_FLAG_MIC_RES_16 and QUIRK_FLAG_MIC_RES_384
  *  Set the fixed resolution for Mic Capture Volume (mostly for webcams)
+ * QUIRK_FLAG_MIXER_MIN_MUTE
+ *  Set minimum volume control value as mute for devices where the lowest
+ *  playback value represents muted state instead of minimum audible volume
  */
 
 #define QUIRK_FLAG_GET_SAMPLE_RATE	(1U << 0)
@@ -245,5 +248,6 @@ extern bool snd_usb_skip_validation;
 #define QUIRK_FLAG_FIXED_RATE		(1U << 21)
 #define QUIRK_FLAG_MIC_RES_16		(1U << 22)
 #define QUIRK_FLAG_MIC_RES_384		(1U << 23)
+#define QUIRK_FLAG_MIXER_MIN_MUTE	(1U << 24)
 
 #endif /* __USBAUDIO_H */

---
base-commit: 7656e95cbd3ee0c67bbedf0a184eb307bb9aa65f
change-id: 20250826-sound-quirk-min-mute-812352b0a6b4

Best regards,
-- 
Cryolitia PukNgae <cryolitia@uniontech.com>

Re: [PATCH] ALSA: usb-audio: move mixer_quirks' min_mute into common quirk

[Takashi Iwai]

On Wed, 27 Aug 2025 05:29:02 +0200,
Cryolitia PukNgae via B4 Relay wrote:
> 
> From: Cryolitia PukNgae <cryolitia@uniontech.com>
> 
> We have found more and more devices that have the same problem, that
> the mixer's minimum value is muted. Accroding to pipewire's MR[1]
> and Arch Linux wiki[2], this should be a very common problem in USB
> audio devices. Move the quirk into common quirk,as a preparation of
> more devices' quirk's patch coming on the road[3].
> 
> 1. https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2514
> 2. https://wiki.archlinux.org/index.php?title=PipeWire&oldid=804138#No_sound_from_USB_DAC_until_30%_volume
> 3. On the road, in the physical sense. We have been buying ton of
>    these devices for testing the problem.
> 
> Tested-by: Guoli An <anguoli@uniontech.com>
> Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
> ---
> I also would like to know if the quirk worth a kernel param.

If the workaround becomes common for various devices, it makes sense.
Applied now to for-linus branch.


thanks,

Takashi