[U-Boot] [PATCH 1/7] usb: increase USB descriptor buffer size

[Marek Vasut]

On Sunday, December 13, 2015 at 07:35:19 PM, Stefan Bruens wrote:
> On Sunday 13 December 2015 05:49:24 Marek Vasut wrote:
> > On Sunday, December 13, 2015 at 05:47:18 AM, Stefan Brüns wrote:
> > > The configuration descriptor includes all interface, endpoint and
> > > auxiliary descriptors (e.g. report, union) so 512 may not be enough.
> > > 
> > > Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
> > 
> > Can the size be determined in a dynamic manner instead of this ad-hoc
> > random number ?
> 
> Currently the buffer is allocated on the stack with
> ALLOC_CACHE_ALIGN_BUFFER in usb_select_config(... The buffer is passed to
> usb_get_configuration_no(...), but the buffer size is implicit.
> 
> usb_get_configuration_no(...) already determines and checks the descriptor
> size, but as it can not readjust the buffer it just bails out if it is
> to small.
> 
> The absolute maximum size for the descriptor is 64kB.
> 
> So yes, this is possible, but needs a little bit more work.

Do you feel like working on it ?

Best regards,
Marek Vasut