linux-kernel - Re: query on DWC3

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Message-ID: <20150108165722.GG31926@saruman>
Date:	Thu, 8 Jan 2015 10:57:22 -0600
From:	Felipe Balbi <balbi@...com>
To:	sundeep subbaraya <sundeep.lkml@...il.com>
CC:	"balbi@...com" <balbi@...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,

On Tue, Jan 06, 2015 at 12:39:55PM +0530, sundeep subbaraya wrote:
> >> 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.
> 
> got it..:)
> 
> >
> > btw, why are you reimplementing the driver when there's a perfectly good
> > driver to use in mainline kernel ?
> 
> I am writing a bare metal driver and it didn't work without alignment
> check mentioned above.

just make sure you don't copy GPL code into your bare metal driver,
otherwise your bare metal driver will be GPL by definition. Also, since
you're not using Linux at all, you should be asking support from
Synopsys instead, not the Linux USB mailing list.

-- 
balbi

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