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

[Tom Rini]

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 at nxp.com>
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: Stefano Babic <sbabic at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: not available
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20180911/096a8ce1/attachment.sig>