High-bandwidth/multiple transactions per microframe in usb audio?

[Alexander Tsoy]

В Сб, 25/04/2020 в 20:06 +0200, Pavel Hofman пишет:
> Dne 25. 04. 20 v 14:06 Alexander Tsoy napsal(a):
> > В Пт, 24/04/2020 в 11:42 +0200, Pavel Hofman пишет:
> > > Hi,
> > > 
> > > Please does the current USB audio driver support multiple
> > > transactions
> > > per microframe (high-bandwidth mode)? I could not find it in
> > > endpoint.c
> > > but it may be there or somewhere else :-)
> > 
> > This should be transparent for the driver. See usb_submit_urb()
> > function from drivers/usb/core/urb.c. It allows packets larger than
> > 1024 for isochronous transfers over High Speed and Super Speed
> > buses.
> 
> Alexander, thanks a lot for the info and hint, indeed at
> https://github.com/torvalds/linux/blob/master/drivers/usb/core/urb.c#L444
> 

And I just noticed that USB-audio driver can't properly parse max
packet size for SuperSpeed and SuperSpeed+ devices yet. See
audio_format_alloc_init().