On 08/06/2016 02:55 PM, Stefan Wahren wrote: > Based on these discussions: [1], [2] this patch series implements > DDR support for the MXS MMC host driver. This feature has never been > ported from the vendor kernel. > > It has been tested on a i.MX28 board with eMMC which is currently > not in mainline (Duckbill 2). > > * without DDR support > dd if=/dev/zero of=test bs=8k count=10000 > 81920000 bytes (82 MB) copied, 14.3321 s, 5.7 MB/s > > * with DDR support: > dd if=/dev/zero of=test bs=8k count=10000 > 81920000 bytes (82 MB) copied, 13.4781 s, 6.1 MB/s Not much of a speedup, how so ? > [1] - http://www.spinics.net/lists/linux-mmc/msg32285.html > [2] - http://www.spinics.net/lists/linux-mmc/msg34418.html > > Stefan Wahren (3): > DT: bindings: mmc: Add property for 3.3V only support > mmc: core: add new cap for 3.3V only DDR MMCs > mmc: mxs-mmc: Implement DDR support > > Documentation/devicetree/bindings/mmc/mmc.txt | 7 +++++-- > drivers/mmc/core/host.c | 2 ++ > drivers/mmc/core/mmc.c | 6 ++++++ > drivers/mmc/host/mxs-mmc.c | 22 ++++++++++++++++++++++ > include/linux/mmc/host.h | 1 + > 5 files changed, 36 insertions(+), 2 deletions(-) > -- Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
