linux-kernel - Re: [PATCH 1/3] dmaengine: add TI EDMA DMA engine driver

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Message-ID: <20120816222912.GA15883@n2100.arm.linux.org.uk>
Date:	Thu, 16 Aug 2012 23:29:12 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Matt Porter <mporter@...com>
Cc:	vinod.koul@...el.com, dan.j.williams@...el.com, cjb@...top.org,
	grant.likely@...retlab.ca,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Sekhar Nori <nsekhar@...com>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] dmaengine: add TI EDMA DMA engine driver

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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