[alsa-devel] [PATCH] add native DSD support for XMOS based DACs.

[Jurgen Kramer]

Add quirk for XMOS based DACs for native DSD playback support using the new DSD_U32_LE sample
format. Works for all DAC vendors which use XMOS as idVendor. E.g. iFi Audio
with their micro iDSD and nano iDSD.

Signed-off-by: Jurgen Kramer <gtmkramer at xs4all.nl>
---
 sound/usb/quirks.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 19a921e..e0efffb 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1174,5 +1174,15 @@ u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
 		}
 	}
 
+	/* XMOS based DACs, e.g. iFi Audio micro/nano iDSD */
+	if (le16_to_cpu(chip->dev->descriptor.idVendor) == 0x20b1) {
+		switch (fp->altsetting) {
+		case 2:
+			return SNDRV_PCM_FMTBIT_DSD_U32_LE;
+		default:
+			return 0;
+		}
+	}
+
 	return 0;
 }
-- 
1.9.3