linux-kernel - Re: [PATCH 7/7] arm64: dts: tegra210-p2597: Remove no-1-8-v from sdmmc1

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Date:   Wed, 25 Jul 2018 11:12:59 +0300
From:   Aapo Vienamo <avienamo@...dia.com>
To:     Mikko Perttunen <cyndis@...si.fi>
CC:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] arm64: dts: tegra210-p2597: Remove no-1-8-v from
 sdmmc1

On Wed, 25 Jul 2018 09:58:37 +0300
Mikko Perttunen <cyndis@...si.fi> wrote:

> Looks like patch 6 will probably cause tegra-sdhci to start advertising 
> faster modes (see " if (!IS_ERR(host->mmc->supply.vqmmc))" in 
> sdhci-tegra.c). With that patch and this, will the SDHCI core start to 
> try putting us into these higher modes? Clearly that won't work yet 
> before the upcoming patches.

The SDHCI core won't do that yet at this point. The host capability bits
for the higher speed modes are currently masked by tegra_sdhci_reset()
in sdhci-tegra. The modes are unmasked in another patch after everything
that's required to support the modes has been implemented.

 -Aapo