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Date:   Wed, 25 Jan 2017 10:16:13 +0100
From:   Maxime Ripard <>
To:     Ulf Hansson <>
Cc:     Chen-Yu Tsai <>, Rob Herring <>,
        "" <>,
        "" <>,
        "" <>,
        Andre Przywara <>
Subject: Re: [PATCH v3 5/13] mmc: sunxi: Mask DATA0 when updating the clock

On Tue, Jan 24, 2017 at 09:18:46AM +0100, Ulf Hansson wrote:
> On 16 January 2017 at 17:56, Maxime Ripard
> <> wrote:
> > The A64 MMC controllers need DATA0 to be masked while updating the clock,
> > otherwise any subsequent command will result in a timeout.
> Could you elaborate on what mask DATA0 really means? I don't follow.

To be honest, I don't really know :)

This is how it's called both in the vendor tree and the datasheet. I
*think* it might be the first data line on the bus, but I'm not sure
exactly why that would cause any issue when updating the clock.


Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering

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