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Volumio 2 - Audiophile Music Player
http://volumio.org
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USB Audio quirks for Kernel 4.14.90 #1686

Closed gkkpch closed 5 years ago

gkkpch commented 5 years ago

I have a patch, assembled from from 4.18.y and 4.19.y, which brings DSD Direct capable device support to the level of the last stable kernel.. This patch has been tested with kernel 4.14.90 on cubox-i and works perfectly. I added two kernel print messages for XMOS/Thesycon/Mytek devices, which will show if and which altsetting is DSD Direct capable. These patches are not in the PI kernel, so if we want to use them, we have to compile our own.

Here is the link: https://github.com/gkkpch/USB-Audio-Patches

volumio commented 5 years ago

What do you suggest? Shall we go and compile all kernels?

gkkpch commented 5 years ago

We do most of them already, except PI, Cubox and Asus (when we get back to normal after the Tinker clock issue has been fixed). With Asus we can get patches integrated fairly easy, with Cubox I rely on Armbian (might actually use that for other main platforms. Armbian’s build method offers the opportunity to patch ourselves. Leaves the PI. Not a lot of work after doing that for the first time, perhaps @macmpi is willing to maintain that (there is a weekly update for 4.14.y).

But this also reminds me of one thing I have not done consistently: document it properly.

macmpi commented 5 years ago

@gkkpch you may want to suggest the patch to @pelwell and crew at https://github.com/raspberrypi/linux/issues: they might cherry-pick into next 4.14.x, as this is potentially beneficial to many.

volumio commented 5 years ago

Great idea!

And I also had another one for the pi kernel: for the USB quirks to be added, why don't we just rebuild the ko file and add it on top of the official pi kernel?

pelwell commented 5 years ago

Go for it. I don't think we'll be on 4.14 much longer, but anything which is essentially a back port is usually accepted very quickly.

gkkpch commented 5 years ago

@pelwell / @macmpi I followed your advice and created a PR with it.

gkkpch commented 5 years ago

I’ll close this one, it has just been merged into the PI kernel 4.14.y as #2790.