On 1 December 2015 at 09:41, Chen Bough <[email protected]> wrote:
> Hi,
>
> After
> commit 197160d52e859575ff0ad1afd674ab2a825b9f83
> Author: Nick Sanders <[email protected]>
> Date:   Tue May 6 18:52:38 2014 -0700
>
>     mmc: sdhci: remove mdelay in eMMC tuning
>
>
> I find Micron eMMC HS200 and HS400 can't pass tuning on i.MX7D platform, here 
> is the log:
>
> [    2.835581] sdhci: Tuning procedure failed, falling back to fixed sampling 
> clock
> [    2.843071] mmc1: tuning execution failed
> [    2.847104] mmc1: error -5 whilst initialising MMC card
>
> When I revert this commit, issue gone.

Thanks for reporting the problem!

There's been a lot of changes regarding tuning since then, both to
sdhci and the mmc core. So before I consider a revert for that patch,
can you share on what baseline you are on!?

[...]

Kind regards
Uffe
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