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

[Jaehoon Chung]

On 05/25/2017 01:14 AM, Masahiro Yamada wrote:
> 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 I marked this patch Superseded.

Oh..thanks for marking..Sorry for late.

Best Regards,
Jaehoon Chung

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