MicroSD initialization timeout. When inserting the sd card, dmseg shows "mmc0: error -110 whilst initialising SD card" With some logs, i see that mmc_send_app_op_cond is the function that timeouts.

[Lmoio.1]

My device tree is the following:

&sdmmc1 {
	pinctrl-names = "default", "opendrain", "sleep";
	pinctrl-0 = <&sdmmc1_b4_pins_a>;
	pinctrl-1 = <&sdmmc1_b4_od_pins_a>;
	pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;
	cd-gpios = <&gpiog 1 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
	disable-wp;
	cd-debounce-delay-ms = <500>;
	no-1-8-v;
	max-frequency = <1000000>;
	//st,sig-dir;
	//st,neg-edge;
	//st,use-ckin;
	bus-width = <4>;
	vmmc-supply = <&vdd_sd>;
	//vqmmc-supply = <&sd_switch>;
	sd-uhs-sdr12;
	sd-uhs-sdr25;
	sd-uhs-sdr50;
	sd-uhs-ddr50;
	status = "okay";
};

Sd schematics is the following:

[PatrickF]

Hi,

I copy below the STM32MP157F-DK2 Device tree portion which could help.

&sdmmc1 {
	pinctrl-names = "default", "opendrain", "sleep";
	pinctrl-0 = <&sdmmc1_b4_pins_a>;
	pinctrl-1 = <&sdmmc1_b4_od_pins_a>;
	pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;
	cd-gpios = <&gpiob 7 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
	disable-wp;
	st,neg-edge;
	bus-width = <4>;
	vmmc-supply = <&v3v3>;
	status = "okay";
};

please remove all the sd-uhs-***; which refer to 1.8V signalling not supported with your HW.

please add st,neg-edge;

not sure max-frequency = ; is needed. please refer also to this article in case of issue about SDMMC frequencies: https://community.st.com/s/article/FAQ-STM32MP1-how-to-setup-the-SDMMC-CK-clock-frequency-in-Linux

Regards.

[Lmoio.1]

Hi @PatrickF​

removing the st,* and all the sd-uhs* properties was not enough, I had to add 

/delete-property/ st,sig-dir;
	/delete-property/ st,use-ckin;	
 /delete-property/ sd-uhs-sdr12;
	/delete-property/ sd-uhs-sdr25;
	/delete-property/ sd-uhs-sdr50;
	/delete-property/ sd-uhs-ddr50;

now I can see the SD.

At times, i see still the error after removing the card:

[ 64.185572] mmc0: new high speed SDHC card at address e624
[ 64.199567] mmcblk0: mmc0:e624 SS16G 14.8 GiB
[ 64.209597] mmcblk0: p1
[ 65.218871] mmc0: card e624 removed
[ 65.338268] mmc0: error -110 whilst initialising SD card

thanks

[Lmoio.1]

Maybe this is resolved by adding   cd-debounce-delay-ms = <>;