Forcing to configure my sdio device in high speed mode instead of SDR50

[jtobias]

Hi,

My wireless device is running SDR50 on iMX6SL. For some reason, I need to test the device in high speed mode.

I would like to know how to force the sdhci-esdhc-imx.c to configure the device in high speed mode

instead of SDR50?.

Regards,

john

[DongAisheng · Accepted solution]

Hi John,

If you're using FSL release L3.10 kernel or latest upstream kernel,

there're two ways to disble USH mode for the card.

1. you can simply disable USH mode by adding no-1-8-v property under the device node.

e.g.

&usdhc1 {

        pinctrl-names = "default", "state_100mhz", "state_200mhz";

        pinctrl-0 = <&pinctrl_usdhc1_1>;

        pinctrl-1 = <&pinctrl_usdhc1_1_100mhz>;

        pinctrl-2 = <&pinctrl_usdhc1_1_200mhz>;

        bus-width = <8>;

        cd-gpios = <&gpio4 7 0>;

        wp-gpios = <&gpio4 6 0>;

        no-1-8-v;

        keep-power-in-suspend;

        enable-sdio-wakeup;

        status = "okay";

};

2. Do not define uhs pinctrl state, then driver will also automatically fall back to non-uhs mode

for the card.

e.g.

&usdhc1 {

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_usdhc1_1>;

        bus-width = <8>;

        cd-gpios = <&gpio4 7 0>;

        wp-gpios = <&gpio4 6 0>;

        keep-power-in-suspend;

        enable-sdio-wakeup;

        status = "okay";

};

Regards

Dong Aisheng

[jtobias]

Hi Dong,

Thanks for the info.

Regards,

john

[Rita_Wang]

Hi John,

If you have solved your problem, please help  click the Correct Answer button. Thank you very much~~

Have a nice day.

Best Regards

Dan