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| /rk3399_rockchip-uboot/drivers/mmc/ |
| H A D | mmc.c | b673f29a58f5996a9e943fcf782c3810e5108c0f Mon May 15 06:07:25 UTC 2017 Ziyuan Xu <xzy.xu@rock-chips.com> mmc: add support for HS400 mode of eMMC5.0
This patch adds HS400 mode support for eMMC5.0 device. HS400 mode is
high speed DDR interface timing from HS200. Clock frequency is up to
200MHz and only 8-bit bus width is supported. In addition, tuning
process of HS200 is required to synchronize the command response on the
CMD line because CMD input timing for HS400 mode is the same as HS200
mode.
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
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