Ignored USB-audio implicit feedback in kernel 5.8rc3

[Takashi Iwai]

On Fri, 03 Jul 2020 12:17:14 +0200,
Pavel Hofman wrote:
> 
> 
> Dne 02. 07. 20 v 13:28 Pavel Hofman napsal(a):
> > 
> > 
> > Please is the requirement that EP OUT + EP IN implicit feedback data
> > must be in the same interface really necessary? If such a requirement
> > was dropped, IMO many devices could be removed from the existing
> > set_sync_ep_implicit_fb_quirk and many devices would work out of the
> > box, 
> 
> I am still thinking about the single-interface requirement. If both
> endpoints were to be part of a single interface, could they use
> different altsettings for different sample lengths for capture and
> playback? E.g. to save USB bandwidth when the capture is used only for
> implicit feedback - capturing at 16bits, playback at 32bits.
> 
> In the quirked XMOS devices the common clock for both directions is
> defined by the clock feature, the altsettings for each direction (in
> separate interfaces) are used for setting sample length.
> 
> Thank you very much for any insight into the issue. IMO not having to
> add quirks before a device starts working would be advantageous for all
> involved.

Could you check for-linus branch of my sound git tree?
Just to be sure whether you're hitting the issue that has been already
addressed.


thanks,

Takashi