[U-Boot] [U-Boot,V4,2/2] mmc: fsl_esdhc: enable HS400 feature

[Tom Rini <trini@konsulko.com>]

On Fri, Aug 10, 2018 at 02:07:55PM +0800, Peng Fan wrote:

> The strobe dll code is ported from Linux Kernel:
> drivers/mmc/host/sdhci-esdhc-imx.c
> The comments are from the above file,
> "For HS400 eMMC, there is a data_strobe line. This signal is generated
> by the device and used for data output and CRC status response output
> in HS400 mode. The frequency of this signal follows the frequency of
> CLK generated by host. The host receives the data which is aligned to the
> edge of data_strobe line. Due to the time delay between CLK line and
> data_strobe line, if the delay time is larger than one clock cycle,
> then CLK and data_strobe line will be misaligned, read error shows up.
> So when the CLK is higher than 100MHz, each clock cycle is short enough,
> host should configure the delay target. "
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> Cc: Jaehoon Chung <jh80.chung@samsung.com>
> Cc: Stefano Babic <sbabic@denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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