Sdmmc microsd card doesn't work on JetPack 4.5.1 & 4.6

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

Hi Nvidia
I use emmc version of NX module on our own carrier board .
It has microSD slot on carrier board.
When I use L4T 32.4.3 , JetPack 4.4 , sd card works properly , mount device as mmcblk1p1.

After update to 4.5.1 , sdmmc seems not worked anymore.

. Is there any difference between JetPack 4.4 and newer version are related to SDMMC?

2

I just helped several users enable their extra sdcard slot in recent weeks. Basically nothing is changed between these release.

What was your modification in device tree?

3

Finally , i modified the dts on NX , related to cd-gpio , and its works.
sources/hardware/nvidia/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-sdhci.dtsi
in sdmmc3

    cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Q, 2) 0>;
	nvidia,cd-wakeup-capable;
	status = "okay";

PQ02 is the pin we designed on carrier board to use as sd card 's cd-gpio

Another question , but it is on TX2NX
I take similar modify to dts , but it doesn’t work.
hardware/nvidia/soc/t18x/kernel-dts/tegra186-soc/tegra186-soc-sdhci.dtsi
sdmmc3

cd-gpios = <&tegra_main_gpio TEGRA_MAIN_GPIO(X, 4) 0>;
nvidia,cd-wakeup-capable;
status = okay;|

PQ02 pinmux mapping on TX2NX is PX04 , both using same carrier board.
We also modified PX04 pull-high resistor on carrier board as TX2NX pinmux excel shows , which is no required on NX.
But sd card still not work on TX2NX in Ubuntu.
, and PX04=476 gpio can be export , it does’t change state while sd card plugged.
Is there any other modification required on TX2NX of using sd card?

4

You can refer to this post.

Actually, the most important things are: cd-gpios and vmmc-supply. These two should match your hardware design.

Even if your give a always-on vdd, you have to assign a always-on regulator to the vmmc-supply.

5

Hi Wayne:
I’ve check this thread for solution then try to add same sdhci modify to my dts on l4t 4.6

 sdhci@3440000 {
	status = "okay";
    cd-gpios = <&tegra_main_gpio TEGRA_MAIN_GPIO(X, 4) 0>;
    vmmc-supply = <&spmic_sd3>;
    nvidia,vmmc-always-on;
    mmc-ocr-mask = <3>;
    sd-uhs-sdr104;
    sd-uhs-sdr50;
    sd-uhs-sdr25;
    sd-uhs-sdr12;
    mmc-ddr-1_8v;
    mmc-hs200-1_8v;

    /delete-property/ non-removable;
    /delete-property/ force-non-removable-rescan;
};

They said sd card should be worked at least , except hot-plugged cd-gpio modify.
But it seems not worked on our board as they did.
My kernel log doesn’t show any mmc1 related info.

tegra186-p3636-0001-p3509-0000-a01.dts (4.8 KB)
And why their TX2NX dts is so many difference with mine?
Did i modify the right dts of l4t 4.6 on TX2NX?
path is sources/hardware/platform/lanai/kernel-dts/tegra186-p3636-0001-p3509-0000-a01.dts

On NX , we use the same carrier board as TX2NX .
The sd card is worked after modify as above reply told.
cd-gpio PQ02 on NX is mapping to TX2NX PX04

6

Please take this a common sense that you should provide the full dmesg for debugging issue in kernel.

7

Also, what is the exact platform that has problem?

NX or TX2 NX? If issuec is on TX2 NX, please file to the correct forum.

8

Hi Wayne:
I’ve reposted on TX2 section