linux-kernel - Re: [PATCH v4 02/21] ARM: dts: imx7-colibri: disable HS400

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Message-ID: <20190819110645.GL5999@X250>
Date:   Mon, 19 Aug 2019 13:06:46 +0200
From:   Shawn Guo <shawnguo@...nel.org>
To:     Philippe Schenker <philippe.schenker@...adex.com>
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michal Vokáč <michal.vokac@...ft.com>,
        Fabio Estevam <festevam@...il.com>,
        Stefan Agner <stefan.agner@...adex.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH v4 02/21] ARM: dts: imx7-colibri: disable HS400

On Mon, Aug 12, 2019 at 02:21:17PM +0000, Philippe Schenker wrote:
> From: Stefan Agner <stefan.agner@...adex.com>
> 
> Force HS200 by masking bit 63 of the SDHCI capability register.
> The i.MX ESDHC driver uses SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400. With
> that the stack checks bit 63 to descide whether HS400 is available.
> Using sdhci-caps-mask allows to mask bit 63. The stack then selects
> HS200 as operating mode.
> 
> This prevents rare communication errors with minimal effect on
> performance:
> 	sdhci-esdhc-imx 30b60000.usdhc: warning! HS400 strobe DLL
> 		status REF not lock!
> 
> Signed-off-by: Stefan Agner <stefan.agner@...adex.com>
> Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>

Applied, thanks.