linux-kernel - Re: [PATCH v3 02/21] ARM: dts: imx7-colibri: disable HS400

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Date:   Fri, 9 Aug 2019 14:05:12 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     Max Krummenacher <max.krummenacher@...adex.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "michal.vokac@...ft.com" <michal.vokac@...ft.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Stefan Agner <stefan.agner@...adex.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-imx@....com" <linux-imx@....com>
Subject: Re: [PATCH v3 02/21] ARM: dts: imx7-colibri: disable HS400

On Wed, 2019-08-07 at 08:26 +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>

Acked-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>

> ---
> 
> Changes in v3: None
> Changes in v2: None
> 
>  arch/arm/boot/dts/imx7-colibri.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/imx7-colibri.dtsi
> b/arch/arm/boot/dts/imx7-colibri.dtsi
> index f1c1971f2160..f7c9ce5bed47 100644
> --- a/arch/arm/boot/dts/imx7-colibri.dtsi
> +++ b/arch/arm/boot/dts/imx7-colibri.dtsi
> @@ -325,6 +325,7 @@
>  	vmmc-supply = <&reg_module_3v3>;
>  	vqmmc-supply = <&reg_DCDC3>;
>  	non-removable;
> +	sdhci-caps-mask = <0x80000000 0x0>;
>  };
>  
>  &iomuxc {