lkml.org 
[lkml]   [2014]   [Dec]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: query on DWC3
Hi,

(please don't top-post)

On Sun, Dec 14, 2014 at 08:39:18AM +0530, sundeep subbaraya wrote:
> Hi Paul,
>
> As per my understanding, for BULK OUT we do queue a request with 512
> bytes length since we do not

sometimes we _do_ know the size. In case of Mass Storage, we _know_ that
the first bulk out transfer will be 31-bytes (CBW), if we were to start
a 31-byte transfer, we would't receive anything.

> know the length of the transfer Host is going to send. For Control OUT
> we know the length in wLength of
> Setup packet, hence I assumed there is no difference in programming
> model of Control IN and OUT.

there is _no_ difference. It's just that it was agreed that for anything
other than control ep, the function drivers would take care of it. See
the uses of quirk_ep_out_aligned_size.

--
balbi
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2014-12-22 17:41    [W:0.071 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site