From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH 1/3] dmaengine: add TI EDMA DMA engine driver
Date: Thu, 16 Aug 2012 23:29:12 +0100
Message-ID: <20120816222912.GA15883@n2100.arm.linux.org.uk>
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Cc: vinod.koul@intel.com, dan.j.williams@intel.com, cjb@laptop.org,
	grant.likely@secretlab.ca,
	Linux DaVinci Kernel List
	<davinci-linux-open-source@linux.davincidsp.com>,
	Sekhar Nori <nsekhar@ti.com>,
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To: Matt Porter <mporter@ti.com>
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On Thu, Aug 16, 2012 at 05:44:29PM -0400, Matt Porter wrote:
> Add a DMA engine driver for the TI EDMA controller. This driver
> is implemented as a wrapper around the existing DaVinci private
> DMA implementation. This approach allows for incremental conversion
> of each peripheral driver to the DMA engine API. The EDMA driver
> supports slave transfers but does not yet support cyclic transfers.

Have you looked at the virt-dma support?  That should allow you to
avoid some common errors, like forgetting that stuff submitted but
not issued should not be started even if the channel is currently
running.