[U-Boot] [PATCH] mmc: sdhci-cadence: set timing mode register depending on frequency

[Masahiro Yamada]

2017-05-19 21:24 GMT+09:00 Masahiro Yamada <yamada.masahiro at socionext.com>:
> The MMC framework in U-Boot does not support a systematic API for
> timing switch like mmc_set_timing() in Linux.
>
> U-Boot just provides a hook to change the clock frequency via
> mmc_set_clock().  It is up to drivers if additional register
> settings are needed.
>
> This driver needs to set a correct timing mode into a register when
> it migrates to a different speed mode.  Only increasing clock frequency
> could result in setup/hold timing violation.
>
> The timing mode should be decided by checking MMC_TIMING_* like
> drivers/mmc/host/sdhci-cadence.c in Linux, but "timing" is not
> supported by U-Boot for now.  Just use mmc->clock to decide the
> timing mode.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

I see lots of improvements for MMC core.

Looks like it is better to rebase my work
after they are merged.


I marked this patch Superseded.




-- 
Best Regards
Masahiro Yamada