linux-kernel - RE: [PATCH 0/5] ep93xx DMA patches

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Date:	Mon, 23 May 2011 12:34:28 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Mika Westerberg <mika.westerberg@....fi>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	"ryan@...ewatersys.com" <ryan@...ewatersys.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/5] ep93xx DMA patches

On Sunday, May 22, 2011 10:03 AM, Mika Westerberg wrote:
>
> Hello all,
>
> Motivation of this series was to add DMA support for the ep93xx SPI driver.
> However, current platform DMA code didn't support the M2M channels which were
> required for SPI (and IDE) peripherals.
>
> Ryan Mallon suggested that maybe we should integrate both M2M and M2P code
> under the dmaengine API. The purpose of this series is to do just that and
> convert all the existing users to use that new API.
>
> Patches 1-4 add dmaengine driver and convert the existing users to dmaengine
> API. The last patch adds DMA support for the SPI driver.
>
> I've been testing these on TS-7260 (ep9302) connected to SPI EEPROM, and
> Sim.One (ep9307) with mmc_spi and AC'97 audio.
>
> memcpy() testing has been done by running drivers/dma/dmatest.ko.
>
> Regards,
> MW
>
> Mika Westerberg (5):
>   dmaengine: add ep93xx DMA support
>   ep93xx: add dmaengine platform code
>   ASoC: ep93xx: convert to use the DMA engine API
>   ep93xx: remove the old M2P DMA code
>   spi/ep93xx: add DMA support
>
>  Documentation/spi/ep93xx_spi                   |   10 +
>  arch/arm/mach-ep93xx/Makefile                  |    2 +-
>  arch/arm/mach-ep93xx/core.c                    |    6 +-
>  arch/arm/mach-ep93xx/dma-m2p.c                 |  411 -------
>  arch/arm/mach-ep93xx/dma.c                     |  108 ++
>  arch/arm/mach-ep93xx/include/mach/dma.h        |  190 ++---
>  arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h |    2 +
>  drivers/dma/Kconfig                            |    7 +
>  drivers/dma/Makefile                           |    1 +
>  drivers/dma/ep93xx_dma.c                       | 1356 ++++++++++++++++++++++++
>  drivers/spi/ep93xx_spi.c                       |  303 +++++-
>  sound/soc/ep93xx/ep93xx-ac97.c                 |    4 +-
>  sound/soc/ep93xx/ep93xx-i2s.c                  |    4 +-
>  sound/soc/ep93xx/ep93xx-pcm.c                  |  137 ++--
>  14 files changed, 1929 insertions(+), 612 deletions(-)
>  delete mode 100644 arch/arm/mach-ep93xx/dma-m2p.c
>  create mode 100644 arch/arm/mach-ep93xx/dma.c
>  create mode 100644 drivers/dma/ep93xx_dma.c

Mika,

Thanks for posting this.  I'll try to do some testing and feedback later this
week.

One positive, it looks like this will result in a small reduction in the LOC
for arch/arm/mach-ep93xx.  That might help in getting this merged.  ;-)

Regards,
Hartley
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