On Tue, Nov 01, 2022 at 02:30:50PM +0100, Marco Felsch wrote:
> This commit is required to fix the SD card detection mechanism. Without
> this commit the SD card (auto-)detection fails when booted from this
> sd-card:
>
> mmc1: Query interface conditions failed: -110
> mmc1: SD operation condition set timed out
>
> The commit is ported from U-Boot:
>
> | commit 247bbeb74c186963d9365db3136d0285618bd9a7
> | Author: Andrey Zhizhikin <andrey.zhizhikin@xxxxxxxxxxxxxxxxxxxx>
> | Date: Sat Dec 5 17:29:17 2020 +0000
> |
> | ARM: dts: imx8m: increase off-on delay on the SD Vcc regulator
> |
> | Some SD Card controller and power circuitry has increased capacitance,
> | which keeps the internal logic remains powered after regulator is switch
> | off. This is generally the case when card is switched to SD104 mode,
> | where a power cycle should be performed. In case if the card internal
> | logic remains powered, it causes a subsequent failure of mode
> | transition, effectively leading to failed enumeration.
> |
> | Introduce a delay of 20 msec in order to provide a possibility for
> | internal card circuitry to drain voltages and perform a power cycle
> | correctly.
> |
> | Similar fix is done in commit c49d0ac38a76 ("ARM: dts: rmobile: Increase
> | off-on delay on the SD Vcc regulator") targeted Renesas SOCs.
> |
> | Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@xxxxxxxxxxxxxxxxxxxx>
> | Cc: Stefano Babic <sbabic@xxxxxxx>
>
> Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
> ---
> arch/arm/dts/imx8mp-evk.dts | 4 ++++
> 1 file changed, 4 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/arch/arm/dts/imx8mp-evk.dts b/arch/arm/dts/imx8mp-evk.dts
> index 3264ade4b8..77b438287c 100644
> --- a/arch/arm/dts/imx8mp-evk.dts
> +++ b/arch/arm/dts/imx8mp-evk.dts
> @@ -35,6 +35,10 @@
> reset-deassert-us = <100000>;
> };
>
> +®_usdhc2_vmmc {
> + off-on-delay-us = <20000>;
> +};
> +
> &usdhc2 {
> #address-cells = <1>;
> #size-cells = <1>;
> --
> 2.30.2
>
>
>
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