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 [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(-) -- 1.7.9.5 -- 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
