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: NJurgen Kramer <gtmkramer@xs4all.nl>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/usb/quirks.c

@@ -1213,5 +1213,16 @@ u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
 		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;
 }