[Bug 252434] for USB audio headset, need do set interface dynamiclly for power save and correct status of headsets

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252434

--- Comment #3 from Horse Ma <shichun_ma at dell.com> ---

Put this diff to Phabricator.
https://reviews.freebsd.org/D28032

We are running Citrix VDI application on FreeBSD, and there will be audio
choppy when playing short audio voice if set_interface in chn_start set when
audio is playing by Citrix VDI application. 

It seems that it need use as less as time in chn_start. So I add chn_prepare
and do set_interface which need quite long time before chn_start.

It will make the headset situation more complicated if use "usbconfig -d X.Y
power_save". 
Power_save will not set interface, and the device may need longer time to
recover working again. 
It's not a standard method to support this feature.

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