linux-kernel - Re: [PATCH v3 1/1] dw_dmac: add cyclic API to DW DMA driver

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Date:	Wed, 1 Apr 2009 15:52:05 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
Cc:	linux-kernel@...r.kernel.org, dan.j.williams@...el.com,
	maciej.sosnowski@...el.com,
	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
Subject: Re: [PATCH v3 1/1] dw_dmac: add cyclic API to DW DMA driver

Hans-Christian Egtvedt wrote:
> This patch adds a cyclic DMA interface to the DW DMA driver. This is
> very useful if you want to use the DMA controller in combination with a
> sound device which uses cyclic buffers.
> 
> Using a DMA channel for cyclic DMA will disable the possibility to use
> it as a normal DMA engine until the user calls the cyclic free function
> on the DMA channel. Also a cyclic DMA list can not be prepared if the
> channel is already active.
> 
> Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>

Acked-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
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