linux-kernel - Re: [PATCH 1/3] dmaengine: add possibility for cyclic transfers

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Message-ID: <AANLkTi=otwukcL2RM3P=hdAgzY+QDv99abQh4QXtVuqo@mail.gmail.com>
Date:	Mon, 16 Aug 2010 14:27:15 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Lothar Waßmann <LW@...o-electronics.de>
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] dmaengine: add possibility for cyclic transfers

2010/8/16 Lothar Waßmann <LW@...o-electronics.de>:

> Why not implement this feature using cyclic SG lists (created with
> sg_chain())? This would give you endless DMA transfers without any
> special DMA API extensions.

That would be elegant...

The driver will have to detect that the sglist is chained like an
ouroboros to program the DMAC apropriately, is is easy to
detect if an sglist is chained onto itself?

Yours,
Linus Walleij
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