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    SubjectRe: [PATCH v4 02/21] ARM: dts: imx7-colibri: disable HS400
    Date
    On Mon, Aug 12, 2019 at 5:23 PM Philippe Schenker
    <philippe.schenker@toradex.com> wrote:
    >
    > From: Stefan Agner <stefan.agner@toradex.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@toradex.com>
    > Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>

    Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>

    > ---
    >
    > Changes in v4: None
    > 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 {
    > --
    > 2.22.0
    >


    --
    Best regards
    Oleksandr Suvorov

    Toradex AG
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