linux-kernel - Re: [PATCH v3 1/3] dmaengine: add dma_get_slave_sg

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Date:	Wed, 6 Mar 2013 14:58:19 -0500
From:	Matt Porter <mporter@...com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <djbw@...com>, Chris Ball <cjb@...top.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] dmaengine: add dma_get_slave_sg_caps()

On Tue, Feb 12, 2013 at 05:08:44PM +0000, Vinod Koul wrote:
> On Mon, Feb 04, 2013 at 02:47:02PM -0500, Matt Porter wrote:
> > Add a dmaengine API to retrieve slave SG transfer capabilities.
> > 
> > The API is optionally implemented by dmaengine drivers and when
> > unimplemented will return a NULL pointer. A client driver using
> > this API provides the required dma channel, address width, and
> > burst size of the transfer. dma_get_slave_sg_caps() returns an
> > SG caps structure with the maximum number and size of SG segments
> > that the given channel can handle.
> Okay this sounds much better :-)
> 
> few points though:
> - you added API for caps, but is actually calculating for given configuration
>   the max allowed range. IMHO that is not caps, perhaps renaming to get_max_sg
>   /some_better_name would be more apt.

I went with get_slave_sg_limits(), seemed pretty descriptive. Just
posted v4 with that change.

> - Still I like the idea of caps, but it should give H/W support capablity. If
>   you want to add that, pls develop on same line...

Ok, seems like a good separate submission.
 
-Matt
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