linux-kernel - Re: [PATCH v4 0/6] dmaengine/mmc: DMA slave interface and two new drivers

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Date:	Thu, 3 Jul 2008 18:06:27 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Haavard Skinnemoen" <haavard.skinnemoen@...el.com>
Cc:	"Pierre Ossman" <drzeus-list@...eus.cx>,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	kernel@...32linux.org, shannon.nelson@...el.com,
	"David Brownell" <david-b@...bell.net>
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
<haavard.skinnemoen@...el.com> 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:
>
>        http://lkml.org/lkml/2008/6/25/148
>
> and the atmel-mci driver depends on this series:
>
>        http://lkml.org/lkml/2008/6/26/158
>
> 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.

Thanks,
Dan
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