linux-kernel - Re: [PATCH v2 4/7] mmc: meson-gx: disable HS400

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Date:   Tue, 30 Apr 2019 22:28:27 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        linux-amlogic@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] mmc: meson-gx: disable HS400

On Tue, 2019-04-30 at 22:02 +0200, Martin Blumenstingl wrote:
> > Thanks for effort but all this just maintain the blur around HS400 on amlogic.
> > 
> > Let me rephrase it:
> > Tuning (phase or resampling) is meant to compensate the clock round trip in UHS
> > and HS200 modes. In HS400, this should be taken care of by the data strobe.
> > But we have not been to enable this reliably enable this on amlogic chipset ...
> I wasn't aware of this: so far I assumed that we're not setting the
> phase correctly, end of the story.
> thank you again for taking your time to explain this!

No worries. There is the MMC in general, I think I understand it a bit now but 
I might still be mistaken about some stuff. Then there is the HW we have and the
related black magic.

I doubt this is the last update in this driver ...

> 
> > ... and I believe we are back to the original commit message.
> no need to update the description just to explain how HS400 works in
> general, so feel free to use my:
> Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>