linux-kernel - Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64

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Message-ID: <20170125091034.2cwnq7g72fndhuqz@lukather>
Date:   Wed, 25 Jan 2017 10:10:34 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64

Hi Ulf,

On Tue, Jan 24, 2017 at 09:16:12AM +0100, Ulf Hansson wrote:
> On 16 January 2017 at 17:56, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Experience have shown that the using the  autocalibration could severely
> > degrade the performances of the MMC bus.
> >
> > Allwinner is using in its BSP a delay set to 0 for all the modes but HS400.
> > Remove the calibration code for now, and add comments to document our
> > findings.
> 
> So doesn't this break some platforms using HS400? Or are you saying
> those are already broken?

Like Andre said, HS400 isn't supported at all, so there's no
regression or brokenness involved :)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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