Re: [PATCH] mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card

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On Mon, Apr 17, 2017 at 4:10 AM, Haibo Chen <haibo.chen@xxxxxxx> wrote:
> Currently for DDR50 card, it need tuning in default. We meet tuning fail
> issue for DDR50 card and some data CRC error when DDR50 sd card works.
>
> This is because the default pad I/O drive strength can't make sure DDR50
> card work stable. So increase the pad I/O drive strength for DDR50 card,
> and use pins_100mhz.
>
> Tested-and-reported-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.4+

Haibo,

I believe for stable to know how far back this needs to be applied (to
4.4) you need to add something like the following in your commit log:

This fixes DDR50 card support for IMX since DDR50 tuning was enabled
from commit 9faac7b95ea4 (mmc: sdhci: enable tuning for DDR50)

Regards,

Tim



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