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    SubjectRe: [PATCH v2 5/7] atmel-mci: Add experimental DMA support
    On Sun,  5 Oct 2008 18:21:28 +0200
    Haavard Skinnemoen <haavard.skinnemoen@atmel.com> wrote:

    > This adds support for DMA transfers through the generic DMA engine
    > framework with the DMA slave extensions.
    >
    > The driver has been tested using mmc-block and ext3fs on several SD,
    > SDHC and MMC+ cards. Reads and writes work fine, with read transfer
    > rates up to 7.5 MiB/s on fast cards with debugging disabled.
    >
    > Unfortunately, the driver has been known to lock up from time to time
    > with DMA enabled, so DMA support is currently optional and marked
    > EXPERIMENTAL. However, I didn't see any problems while testing 13
    > different cards (MMC, SD and SDHC of different brands and sizes), so I
    > suspect the "Initialize BLKR before sending data transfer command" fix
    > that was posted earlier fixed this as well.
    >
    > Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
    > ---

    Looks good, but I assume the plan is to remove this Kconfig option once
    you're confident it is stable?

    --
    -- Pierre Ossman

    Linux kernel, MMC maintainer http://www.kernel.org
    rdesktop, core developer http://www.rdesktop.org

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