[alsa-devel] [PATCH 1/1] ALSA: usb: initial USB Audio Device Class 3.0 support

[Ruslan Bilovol]

On Thu, Nov 9, 2017 at 10:33 AM, Greg Kroah-Hartman
<gregkh at linuxfoundation.org> wrote:
> On Thu, Nov 09, 2017 at 09:16:52AM +0100, Takashi Iwai wrote:
>> On Thu, 09 Nov 2017 09:04:58 +0100,
>> Greg Kroah-Hartman wrote:
>> >
>> > On Wed, Nov 08, 2017 at 03:38:35PM +0100, Takashi Iwai wrote:
>> > > On Tue, 07 Nov 2017 03:01:20 +0100,
>> > > Ruslan Bilovol wrote:
>> > > >
>> > > > Recently released USB Audio Class 3.0 specification
>> > > > introduces many significant changes comparing to
>> > > > previous versions, like
>> > > >  - new Power Domains, support for LPM/L1
>> > > >  - new Cluster descriptor
>> > > >  - changed layout of all class-specific descriptors
>> > > >  - new High Capability descriptors
>> > > >  - New class-specific String descriptors
>> > > >  - new and removed units
>> > > >  - additional sources for interrupts
>> > > >  - removed Type II Audio Data Formats
>> > > >  - ... and many other things (check spec)
>> > > >
>> > > > It also provides backward compatibility through
>> > > > multiple configurations, as well as requires
>> > > > mandatory support for BADD (Basic Audio Device
>> > > > Definition) on each ADC3.0 compliant device
>> > > >
>> > > > This patch adds initial support of UAC3 specification
>> > > > that is enough for Generic I/O Profile (BAOF, BAIF)
>> > > > device support from BADD document.
>> > > >
>> > > > Signed-off-by: Ruslan Bilovol <ruslan.bilovol at gmail.com>
>> > >
>> > > The patch looks good, but the timing is fairly late for merging to
>> > > 4.15.
>> >
>> > Isn't kbuild barfing all over these?  Is that because of the cross-tree
>> > changes needed?
>>
>> No, it's just local to the audio driver, plus a few
>> include/linux/usb/*.h modification / addition.
>> So there shouldn't be a big breakage in that regard.

The UAC3 gadget driver (which I sent to linux-usb mailing list) depends on
a new audio-v3.h header which is a part of this patch.

So Felipe's tree will have dependency on Takashi's tree; and that's why
kbuild notifies about build failure of UAC3 gadget driver.

>>
>>
>> > > So from my side, the primary question is whether the changes in USB
>> > > (audio) header files are OK for USB guys.
>> > >
>> > > Greg, could you check these changes and give an ack if it's OK to
>> > > merge?  Or if you prefer postpone, just let me know.
>> >
>> > I don't object to the USB header changes, as long as the fixes you point
>> > out are made :)
>>
>> Good to hear.
>> Could you give your acked-by once after reviewing the patch?
>
> I'm guessing there will be a new patch?  I'll be glad to review that
> one.

Sure, there will be a new patch set soon.

Thanks,
Ruslan