[PATCH] ALSA: usb-audio: add sample-rate quirk for Yamaha 01V96i

[Justin Bacle]

Signed-off-by: Justin Bacle <justin.bacle@xxxxxxxxx>
---
 sound/usb/quirks.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 6176acc04..9a5ea295e 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2332,6 +2332,21 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
 					  int stream)
 {
 	switch (chip->usb_id) {
+	case USB_ID(0x0499, 0x5500): /* Yamaha 01V96i */
+		/*
+		 * The 01V96i declares its audio streaming interfaces as
+		 * vendor-specific (class 0xff) and provides no class-specific
+		 * endpoint descriptor.  parse_uac_endpoint_attributes() therefore
+		 * returns no attributes, and the driver never issues the SET_CUR
+		 * sampling-frequency request the hardware needs to engage its USB
+		 * stream: playback and capture PCMs report RUNNING, but the desk
+		 * passes no audio.
+		 *
+		 * Force the attribute on so the stream is initialised the same way
+		 * the Windows driver does it.
+		 */
+		fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
+		break;
 	case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
 		/* Optoplay sets the sample rate attribute although
 		 * it seems not supporting it in fact.
-- 
2.53.0