SK-AM62P-LP: How to Set SD Card to 3.3v only (low speed)

Tool/software:

Since my future board’s SD card doesn't support switching between 1.8V and 3.3V (we only provide 3.3V), I want to verify if this is feasible on the EVM.

I checked the schematic and the control pin is Y25 (GPIO0_31)

The related DTS in u-boot as below

&main_pmx0 {
	vddshv_sdio_pins_default: vddshvr-sdio-default-pins {
		pinctrl-single,pins = <
			AM62PX_IOPAD(0x007c, PIN_INPUT, 7) /* (Y25) GPMC0_CLK.GPIO0_31 */
		>;
		bootph-all;
	};
};

/{
	vddshv_sdio: regulator-3 {
		compatible = "regulator-gpio";
		regulator-name = "vddshv_sdio";
		pinctrl-names = "default";
		pinctrl-0 = <&vddshv_sdio_pins_default>;
		regulator-min-microvolt = <1800000>;
		regulator-max-microvolt = <3300000>;
		regulator-boot-on;
		gpios = <&main_gpio0 31 GPIO_ACTIVE_HIGH>;
		states = <1800000 0x0>,
			 <3300000 0x1>;
		bootph-all;
	};
};

&sdhci1 {
	/* SD/MMC */
	status = "okay";
	vmmc-supply = <&vdd_mmc1>;
	vqmmc-supply = <&vddshv_sdio>;
	pinctrl-names = "default";
	pinctrl-0 = <&main_mmc1_pins_default>;
	disable-wp;
	bootph-all;
};

But I checked the TP33 (VDDSHV_SDIO), and it is still in 1.8v even I add the line "no-1-8-v;"

If I directly mask the "vqmmc-supply", it can't even boot into U-Boot.

console output