linux-kernel - Re: [PATCH 00/18] dmaengine/amba-pl08x updates

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Message-ID: <20110729124346.GL25640@n2100.arm.linux.org.uk>
Date:	Fri, 29 Jul 2011 13:43:46 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	viresh kumar <viresh.kumar@...com>
Cc:	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	Pratyush ANAND <pratyush.anand@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vipin KUMAR <vipin.kumar@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	Amit VIRDI <Amit.VIRDI@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>,
	Deepak SIKRI <deepak.sikri@...com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 00/18] dmaengine/amba-pl08x updates

On Fri, Jul 29, 2011 at 04:53:52PM +0530, viresh kumar wrote:
> On 07/29/2011 04:49 PM, Russell King - ARM Linux wrote:
> > Ok, so lets have the driver explicitly enforce one SG entry if peripheral
> > flow is set.  It would also be a good idea to pass not zero length, but
> > the real transfer size in the SG entry for the sake of having the API
> > know the full information about the transfer.
> 
> In my case, JPEG driver doesn't know how much data to transfer. So i have to
> send zero from there. Also, i am not sure why would peripheral needs to be
> flow controller if the peripherals driver already know how much to transfer?

If the jpeg driver doesn't know how much data will be transferred, how
can it allocate a buffer for the device to DMA into?
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