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

5 Sep 2014

      On Fri, 2014-09-05 at 11:36 +0200, Clemens Ladisch wrote:
...
Jurgen Kramer wrote:
...
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.
+++ b/sound/usb/quirks.c

/* 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;

Can you confirm that all XMOS devices ever built will have DSD on that
alternate setting?
No, I can not. Most newer implementations will use alt setting 2 for native DSD support.
My first version also used idProduct to only target iFi devices. If this is required, I'll rework my patch.
Regards,
Jurgen