linux-kernel - Re: query on DWC3

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Message-ID: <20141222161218.GF12815@saruman>
Date:	Mon, 22 Dec 2014 10:12:18 -0600
From:	Felipe Balbi <balbi@...com>
To:	Felipe Balbi <balbi@...com>
CC:	sundeep subbaraya <sundeep.lkml@...il.com>,
	Paul Zimmerman <Paul.Zimmerman@...opsys.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: query on DWC3

Hi again,

On Mon, Dec 22, 2014 at 10:11:23AM -0600, Felipe Balbi wrote:
> (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.

btw, why are you reimplementing the driver when there's a perfectly good
driver to use in mainline kernel ?

-- 
balbi

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