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Date:	Thu, 3 Jul 2008 18:06:27 -0700
From:	"Dan Williams" <>
To:	"Haavard Skinnemoen" <>
Cc:	"Pierre Ossman" <>,,,,,
	"David Brownell" <>
Subject: Re: [PATCH v4 0/6] dmaengine/mmc: DMA slave interface and two new drivers

On Thu, Jun 26, 2008 at 6:23 AM, Haavard Skinnemoen
<> wrote:
> First of all, I'm sorry it went so much time between v3 and v4 of this
> patchset. I was hoping to finish this stuff up before all kinds of
> other tasks started demanding my attention, but I didn't, so I had to
> put it on hold for a while. Let's try again...
> This patchset extends the DMA engine API to allow drivers to offer DMA
> to and from I/O registers with hardware handshaking, aka slave DMA.
> Such functionality is very common in DMA controllers integrated on SoC
> devices, and it's typically used to do DMA transfers to/from other
> on-SoC peripherals, but it can often do DMA transfers to/from
> externally connected devices as well (e.g. IDE hard drives).
> The main differences from v3 of this patchset are:
>  * A DMA descriptor can hold a whole scatterlist. This means that
>    clients using slave DMA can submit large requests in a single call
>    to the driver, and they only need to keep track of a single
>    descriptor.
>  * The dma_slave_descriptor struct is gone since clients no longer
>    need to keep track of multiple descriptors.
>  * The drivers perform better and are more stable.
> The dw_dmac driver depends on this patch:
> and the atmel-mci driver depends on this series:
> as well as all preceding patches in this series, of course.
> Comments are welcome, as usual! Shortlog and diffstat follow.
> Haavard Skinnemoen (6):
>      dmaengine: Add dma_client parameter to device_alloc_chan_resources

Applied.  I fixed it up for fsldma and mv_xor.

>      dmaengine: Add dma_chan_is_in_use() function

I applied the chan->client_count patch that we talked about.

>      dmaengine: Add slave DMA interface

There were some comments to the change log and other fixes, so I'll
wait for v5 of this patch.

>      dmaengine: Make DMA Engine menu visible for AVR32 users

Applied the "remove arch dependency in drivers/dma/Kconfig" instead.

>      dmaengine: Driver for the Synopsys DesignWare DMA controller
>      Atmel MCI: Driver for Atmel on-chip MMC controllers

I will wait for v5 on these as well for the chan->client_count fixups
and a response to the dma_unmap situation.

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