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Date:   Thu, 09 Nov 2017 09:58:23 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Ruslan Bilovol <ruslan.bilovol@...il.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ALSA: usb: initial USB Audio Device Class 3.0 support

On Thu, 09 Nov 2017 09:33:44 +0100,
Greg Kroah-Hartman 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@...il.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.
> > 
> > 
> > > > 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, no problem.


thanks,

Takashi

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