Need add support for Gustard X20

Question

Need add support for Gustard X20

Closed this issue 9 years ago · 15 comments

XMOS U8 chip, it supports native mode up to DSD256 under windows. Should be able to support native dsd.
Checked the USB ID code it is different from XMOS code from lintweeaker's code, however it is still XMOS.
Tried the compiled MPD with native dsd support and it is not working. I suppose it is the ALSA part that's not picking it up?

Can you help add this support to the kernel or provide a way to patch it ?

I am currently running RPI 2 with debian based Volumio

updated to kernel
Linux volumio 4.1.4-v7+ #808 SMP PREEMPT

Thank you very much.

Gustard X20
USB ID 20b1:000a XMOS Ltd

Answer 1 · 2015-08-13T16:29:30.000Z

Hello,

Each device has to be added to the linux kernel individually. There is no way to figure out which device supports native DSD and how.

Can you post the output from:

cat /proc/asound/Audio/stream0

This gives me the info needed to create a patch. Can you test this?

Answer 2 · 2015-08-14T01:38:54.000Z

sure, here it is.

Thank you very much

root@volumio:~# cat /proc/asound/card1/stream0
XMOS xCORE USB Audio 2.0 at usb-3f980000.usb-1.5, high speed : USB Audio

Playback:
Status: Stop
Interface 1
Altset 1
Format: S32_LE
Channels: 2
Endpoint: 1 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000
Data packet interval: 125 us
Interface 1
Altset 2
Format: S16_LE
Channels: 2
Endpoint: 1 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000
Data packet interval: 125 us
Interface 1
Altset 3
Format: SPECIAL
Channels: 2
Endpoint: 1 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000
Data packet interval: 125 us

Answer 3 · 2015-08-14T01:46:41.000Z

closed by mistake..

Answer 4 · 2015-08-17T23:21:01.000Z

Any update ? Thank you veyr much

Answer 5 · 2015-08-21T07:44:25.000Z

I have added the patch, can you test?

Answer 6 · 2015-08-21T22:40:40.000Z

Thank you very much!! let me test it.

Answer 7 · 2015-08-22T05:04:56.000Z

Compile on Linux volumio 4.1.6-v7+ #810 SMP PREEMPT .

And compiled mpd with your patch of 0.19.9 and 0.19.10. Both have the same problem

When play DSD file, DAC recognize DSD format , but DSD playback stopped with no sound.

checking MPD log shows the following item

"mpd: pcm_misc.c:620: snd_pcm_format_set_silence: Assertion `0' failed."

Answer 8 · 2015-08-22T06:27:37.000Z

So the kernel patch works for your DAC. The MPD log you showed does not seem to be specific to DSD playback. Please try my mpd 0.18 version to be sure. I am going to close this issue as the kernel part works and this repo is about adding native DSD support to the kernel not MPD.

Answer 9 · 2015-08-22T07:36:17.000Z

Got it, Thank you very much!:)

Just tested MPD 0.18 same problem...

Answer 10 · 2015-08-22T16:20:41.000Z

Sorry too hear. Maybe your DAC is not happy with this little kernel patch alone. Have you tried if MPD works with DoP output? If that works at least it is not a Pi USB issue.

Answer 11 · 2015-08-23T16:38:41.000Z

Dop works perfectly up to dop128. Also dac displays correct signal even shows dsd256.

So I guess hate path works, just some other things it does not like. Btw except for your MPD implementation any other pkg can make use of the Alsa kernel for native dsd?

Is there any value to test it in a different Linux distribution say arch Linux?

Thank you very much again;)

Also x86 platform?

Answer 12 · 2015-08-23T17:30:09.000Z

If you can test on a x86 (x86_64) platform...besides patching the kernel you'll need ALSA 1.0.29 or a patched version of 1.0.27/1.0.28 for 32-bit DSD sample format support.
Fedora 22 and up has ALSA 1.0.29 included.

Answer 13 · 2015-08-23T17:38:56.000Z

Thank you very much, will try that then.

Answer 14 · 2016-04-11T06:02:53.000Z

still has the same problem after testing several different distributions on rpi2

Answer 15 · 2016-04-13T18:23:27.000Z

update using mpd 0.2. issue gone.