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From:   Ruslan Bilovol <ruslan.bilovol@gmail.com>
Date:   Wed, 13 Jun 2018 03:28:50 +0300
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Subject: Re: [PATCH 0/1] USB Audio Device Class 3.0 Gadget support
To:     Felipe Balbi <balbi@kernel.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        linux-doc@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Thu, Dec 7, 2017 at 1:18 PM, Ruslan Bilovol <ruslan.bilovol@gmail.com> wrote:
> Hi Felipe,
>
> On Mon, Dec 4, 2017 at 1:36 PM, Felipe Balbi <balbi@kernel.org> wrote:
>>
>> Hi,
>>
>> Ruslan Bilovol <ruslan.bilovol@gmail.com> writes:
>>> On Tue, Nov 7, 2017 at 3:52 AM, Ruslan Bilovol <ruslan.bilovol@gmail.com> wrote:
>>>> Hi,
>>>>
>>>> This patch adds USB Audio Device Class 3.0 [1] function
>>>> support to gadget subsystem.
>>>> I didn't add UAC3 support to legacy gadget as it will
>>>> make preprocessor configuration too complex (UAC3 device
>>>> must have two configurations for backward compatibility,
>>>> first is UAC1/2 and second is UAC3), yet also I'm too lazy
>>>> to do that and verify all possible configurations.
>>>>
>>>> For modern ConfigFS interface I'll provide my configuration
>>>> for testing below; testing was done on a BeagleBone Black
>>>> board.
>>>>
>>>> This patch depends on uac3 header files from include dir
>>>> which I'll post as part of ALSA host UAC3 patch and will
>>>> provide the link to it here.
>>>
>>> http://www.spinics.net/lists/alsa-devel/msg69071.html
>>
>> Once that patch hits upstream, then we can queue this for merge window
>> otherwise we will just have issues and create unbisectable points in the
>> tree.
>
> Takashi promised to create an immutable branch for that purpose.
>
> However, I'm currently reworking configfs part of UAC3 for channels
> configuration handling, which is now more clear after sharing missing
> parts of UAC3 spec by Pierre-Louis Bossart during host side patches
> review; so I will send v2 soon.

OK, so now we have both UAC3 initial support patches [1] and
also UAC3 BADD profiles support [2] in Torvalds tree, and I'm going
to refresh this patch series and send v2 soon (perhaps in next few weeks)

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9a2fe9b801f585baccf8352d82839dcd54b300cf
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=17156f23e93c0f59e06dd2aaffd06221341caaee

Thanks,
Ruslan