On 22-10-20, Peng Fan (OSS) wrote:
> From: Haibo Chen <haibo.chen@xxxxxxx>
>
> After commit f7907e57aea2 ("regulator: fixed: add off-on-delay"), user
> can use "off-on-delay-us" to define the regulator off-delay time.
>
> For SD card, according to the spec requirement, for sd card power reset
> operation, it need sd card supply voltage to be lower than 0.5v and keep
> over 1ms, otherwise, next time power back the sd card supply voltage to
> 3.3v, sd card can't support SD3.0 mode again.
>
> This patch add the off-on-delay-us to each board, make sure the sd power
> reset behavior is align with the specification. Without this patch, when
> do quick system suspend/resume test, some sd card can't work at SD3.0 mode
> after system resume back.
Please mention that the real issue which is a capicity which gets
unloaded to slow. Please see the u-boot commit for this which explains
it better IMHO.
Regards,
Marco
>
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
> arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 2 +-
> arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 1 +
> arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 1 +
> 3 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> index c93387fcd498..898735965ac9 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> @@ -22,7 +22,7 @@ reg_sd1_vmmc: sd1_regulator {
> regulator-min-microvolt = <3300000>;
> regulator-max-microvolt = <3300000>;
> gpio = <&gpio2 10 GPIO_ACTIVE_HIGH>;
> - off-on-delay = <20000>;
> + off-on-delay-us = <20000>;
> startup-delay-us = <100>;
> enable-active-high;
> };
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> index ce450965e837..fdbcd2483efc 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> @@ -56,6 +56,7 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
> regulator-min-microvolt = <3300000>;
> regulator-max-microvolt = <3300000>;
> gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> + off-on-delay-us = <20000>;
> enable-active-high;
> };
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> index 82387b9cb800..07d9fb2aacf8 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> @@ -46,6 +46,7 @@ reg_usdhc2_vmmc: regulator-vsd-3v3 {
> regulator-min-microvolt = <3300000>;
> regulator-max-microvolt = <3300000>;
> gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> + off-on-delay-us = <20000>;
> enable-active-high;
> };
>
> --
> 2.37.1
>
>
>
