ALSA: usb-audio: Add native DSD support for Denon/Marantz DACs

This patch adds native DSD support for the following devices:
- Marantz SA-14S1
- Marants HD-DAC1

Signed-off-by: Jurgen Kramer <gtmkramer@xs4all.nl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 2c1018e..a9d4add 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1213,5 +1213,16 @@
 		break;
 	}
 
+	/* Denon/Marantz devices with USB DAC functionality */
+	switch (chip->usb_id) {
+	case USB_ID(0x154e, 0x3005): /* Marantz HD-DAC1 */
+	case USB_ID(0x154e, 0x3006): /* Marantz SA-14S1 */
+		if (fp->altsetting == 2)
+			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
+		break;
+	default:
+		break;
+	}
+
 	return 0;
 }