Date: Thu, 16 Aug 2012 23:29:12 +0100
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Matt Porter <mporter@ti.com>
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>,
        Linux MMC List <linux-mmc@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux SPI Devel List 
	<spi-devel-general@lists.sourceforge.net>,
        Linux ARM Kernel List <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/3] dmaengine: add TI EDMA DMA engine driver
Message-ID: <20120816222912.GA15883@n2100.arm.linux.org.uk>
References: <1345153471-22757-1-git-send-email-mporter@ti.com> <1345153471-22757-2-git-send-email-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.
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