Messages in this thread | | | Date | Sun, 12 Oct 2008 10:44:05 +0200 | From | Pierre Ossman <> | Subject | Re: [PATCH v2 5/7] atmel-mci: Add experimental DMA support |
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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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