linux-kernel - Re: [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case

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Message-ID: <4FF1C62B.5070005@wwwdotorg.org>
Date:	Mon, 02 Jul 2012 10:02:51 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	vinod.koul@...el.com, dan.j.williams@...el.com, swarren@...dia.com,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case

On 07/02/2012 02:22 AM, Laxman Dewangan wrote:
> In cyclic mode of DMA, the byte transferred can be more
> than the requested size and in this case, calculating
> residuals based on the current position of DMA transfer to
> bytes requested i.e. bytes required to transfer to reach
> bytes requested from current DMA position.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>

This makes sense to me, although I wonder if details like this aren't
something that the dmaengine core should be handling.

Acked-by: Stephen Warren <swarren@...dotorg.org>
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