Re: How to prevent high speed mode due to signal integrity problem

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Hi Caleb,

On Mon, Dec 5, 2016 at 10:36 PM, Caleb Crome <caleb@xxxxxxxxx> wrote:
> Hello,
>    We have a board here where there is a signal integrity problem on the MMC
> bus.  It works fine at 25MHz, but does not work in higher speed modes.
>
> Is there an easy way to disable all the high speed modes?  Perhaps from the
> device tree?
>
> I tried searching the archives, but gmane seems to be not working.
>
> I'm using a stock 4.8.11 kernel.
> Host processor is i.MX6

Would max-frequency = <25000000>; do the trick?

Please take a look at Documentation/devicetree/bindings/mmc/mmc.txt .
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