From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marex@denx.de>
Date: Sun, 13 Dec 2015 19:49:30 +0100
Subject: [U-Boot] [PATCH 1/7] usb: increase USB descriptor buffer size
In-Reply-To: <2415535.ONnvDgm0Am@pebbles.site>
References: <1449982038-20918-1-git-send-email-stefan.bruens@rwth-aachen.de>
 <201512130549.24439.marex@denx.de> <2415535.ONnvDgm0Am@pebbles.site>
Message-ID: <201512131949.30977.marex@denx.de>
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To: u-boot@lists.denx.de

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 Br?ns 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 Br?ns <stefan.bruens@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