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

[Oleksandr Suvorov <oleksandr.suvorov@xxxxxxxxxxx>]

On Mon, Aug 12, 2019 at 5:23 PM Philippe Schenker
<philippe.schenker@xxxxxxxxxxx> wrote:
>
> From: Stefan Agner <stefan.agner@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> Signed-off-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>

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

> ---
>
> 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

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