linux-kernel - Re: [PATCH v2 0/4] ALSA: usb: UAC3 new features.

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Date:   Tue, 24 Apr 2018 20:02:33 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Jorge Sanjuan" <jorge.sanjuan@...ethink.co.uk>
Cc:     <alsa-devel@...a-project.org>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] ALSA: usb: UAC3 new features.

On Tue, 24 Apr 2018 19:24:41 +0200,
Jorge Sanjuan wrote:
> 
> v2 fixes:
>  - If/else statements braces style fixes.
>  - Add wrapping function to mixer unit code.
>  - Make connectors control kctl struct const.
>  - Little endian to cpu conversion in several places.
>  - Sing off and add Fixes tag to fixup commit.
>  - Remove flex-array for a struct that is used statically.
> 
> Now that the UAC3 patch [1] has made it to linux-next I have some extra
> features to make a UAC3 device fully work in Linux. Including Jack 
> insertion control that I have put on top of this other patch [2] for 
> UAC2. Also adding support for the UAC3 Mixer Unit which is most likely
> to appear in most headset type devices.

These patches look reasonable, I'm OK to merge.  But I'll wait for
Ruslan's comments (or at best with test results).

> UAC3 devices also require to have a Basic Audio Device (BADD) in a separate 
> config for which both Ruslan Bilovol and myself have submited different 
> approaches[3][4] but I don't know what the final merge will be. Once there 
> is official support for BADD, we'll need to test it with an actual UAC3 
> device to confirm it all wokrs.

Could you guys try to get agreement which approach should we take?

I have no big preference.  Currently Ruslan's patch series look
easier, just because its addition is a bit smaller, though.


Thanks!

Takashi

> All this features are tested with an actual UAC3 device that is still in
> development. For this patch series, only the legacy config (#1. UAC1/UAC2)
> and the UAC3 config have been tested. The BADD config is only tested using
> and updated verison of [4].
> 
> [1]: https://patchwork.kernel.org/patch/10298179/
> [2]: https://patchwork.kernel.org/patch/10305847/
> [3]: https://patchwork.kernel.org/patch/10340851/
> [4]: https://www.spinics.net/lists/alsa-devel/msg71617.html
> 
> Based on linux-next tag: next-20180420
> 
> Jorge Sanjuan (3):
>   ALSA: usb-audio: UAC3. Add support for mixer unit.
>   ALSA: usb-audio: Use Class Specific EP for UAC3 devices.
>   ALSA: usb-audio: UAC3 Add support for connector insertion.
> 
> Michael Drake (1):
>   ALSA: usb-audio: ADC3: Fix channel mapping conversion for ADC3.
> 
>  include/linux/usb/audio-v2.h   |   7 ++
>  include/linux/usb/audio-v3.h   |  14 +++
>  include/uapi/linux/usb/audio.h |  13 ++-
>  sound/usb/mixer.c              | 195 +++++++++++++++++++++++++++++++++++++----
>  sound/usb/stream.c             |  11 ++-
>  5 files changed, 217 insertions(+), 23 deletions(-)
> 
> -- 
> 2.11.0
> 
>