linux-kernel - [PATCH] ALSA: usb-audio: Add implicit feedback quirk for RODE AI-1

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Message-Id: <084dc88c-1193-4a94-a002-5599adff936c@app.fastmail.com>
Date: Sun, 01 Jun 2025 12:41:16 -0400
From: "David Heimann" <d@...h.net>
To: tiwai@...e.com
Cc: perex@...ex.cz, linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: usb-audio: Add implicit feedback quirk for RODE AI-1

The RODE AI-1 audio interface requires implicit feedback sync between playback endpoint 0x03 and feedback endpoint 0x84 on interface 3, but doesn't advertise this in its USB descriptors.

Without this quirk, the device receives audio data but produces no output.

Signed-off-by: David Heimann <d@...h.net>
---
Tested using module parameter:
  options snd-usb-audio implicit_fb=1:19f7:000a

This device previously worked but stopped producing audio output (possibly after a kernel or audio subsystem update). This quirk restores functionality.

This resolves audio output on the RODE AI-1 which otherwise receives audio data but produces no sound.

 sound/usb/implicit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/usb/implicit.c b/sound/usb/implicit.c
index 4727043fd7..77f06da931 100644
--- a/sound/usb/implicit.c
+++ b/sound/usb/implicit.c
@@ -57,6 +57,7 @@ static const struct snd_usb_implicit_fb_match playback_implicit_fb_quirks[] = {
 	IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0002, 0x81, 2), /* Solid State Logic SSL2+ */
 	IMPLICIT_FB_FIXED_DEV(0x0499, 0x172f, 0x81, 2), /* Steinberg UR22C */
 	IMPLICIT_FB_FIXED_DEV(0x0d9a, 0x00df, 0x81, 2), /* RTX6001 */
+	IMPLICIT_FB_FIXED_DEV(0x19f7, 0x000a, 0x84, 3), /* RODE AI-1 */
 	IMPLICIT_FB_FIXED_DEV(0x22f0, 0x0006, 0x81, 3), /* Allen&Heath Qu-16 */
 	IMPLICIT_FB_FIXED_DEV(0x1686, 0xf029, 0x82, 2), /* Zoom UAC-2 */
 	IMPLICIT_FB_FIXED_DEV(0x2466, 0x8003, 0x86, 2), /* Fractal Audio Axe-Fx II */
-- 
2.49.0