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 16:08:13 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
CC:	"Williams, Dan J" <dan.j.williams@...el.com>,
	"haavard.skinnemoen@...el.com" <haavard.skinnemoen@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
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>
> ---
>  drivers/dma/dw_dmac.c      |  332 +++++++++++++++++++++++++++++++++++++++++++-
>  drivers/dma/dw_dmac_regs.h |    7 +-
>  include/linux/dw_dmac.h    |   19 +++
>  3 files changed, 356 insertions(+), 2 deletions(-)
> 

Acked-by: Maciej Sosnowski <maciej.sosnowski@...el.com>
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