Why the signal PCIE_3V3_EN can not be asserted to the high voltage level?

[gaga]

The board I am using is the official Jetson Agx Orin 32G carrier kit (P3737+P3701-04).
I have tried Jetson linux R36.3.0 and R35.5.0, and the problem is the same for both.

The settings for cvb/tegr234-p3737 fixed regulator. dtsi are as follows:,
p3737_vdd_3v3_pcie: regulator@105 {
compatible = “regulator-fixed”;
reg = <105>;
regulator-name = “vdd-3v3-pcie”;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
vin-supply = <&p3737_vdd_3v3_sys>;
gpio = <&tegra_main_gpio TEGRA234_MAIN_GPIO(H, 4) 0>;
enable-active-high;
regulator-boot-on;
};
I have also tried by setting gpio GPIO03.PH.04(by canceling the call of GPIO (H, 4) for regulator@105 in the device tree),
but it is still not possible to pull PCIE_3V3_EN to a high level.
May I ask what the reason is?

[WayneWWW]

I have also tried by setting gpio GPIO03.PH.04(by canceling the call of GPIO (H, 4) for regulator@105 in the device tree),
but it is still not possible to pull PCIE_3V3_EN to a high level.

Does this affect your pcie link detection? Have you checked /sys/kernel/debug/gpio?

[gaga]

Yes，I test it without pcie card. because PCIE_3V3_EN can not be asserted to high when the pcie card is inserted ，I want to find the reason out.

[gaga]

[WayneWWW]

Could you share the full dmesg?

[gaga]

init.log (57.8 KB)
this is the log for jetson linux R36.3.0

[WayneWWW]

I just connect a NIC card to my Orin AGX devkit and I can see this get output hi. This is on rel-36 too.

[gaga]

what is the output level when you don’t insert pcie card ?

[gaga]

and can you share your dmesg log?

[gaga]

I can’t see any information about pcie C5 address 0x141a0000 during the start up time for rel-36.3, and I can see some information about pcie C5 address 0x141a0000 for rel-35.5.

[WayneWWW]

Are you sure you are using NV devkit? I see some logs that shouldn’t happen on NV devkit in your attachment.

[gaga]

can you tell me whitch logs that shouldn’t happen on NV devkit ?The seller said this is the NV orin devkit.Maybe they change or add some hardware.

[gaga]

They said that they add M.2 Key M ssd and M.2 Key E wifi card into the slot of NV devkit

[WayneWWW]

[ 10.536407] ucsi_ccg 1-0008: failed to reset PPM!
[ 10.536416] ucsi_ccg 1-0008: error -ETIMEDOUT: PPM init failed

This should not happen.

Also, please share the result of below

1. sudo i2cdump -y -f 0 0x56
2. xxd /proc/device-tree/bus@0/pcie@141a0000/status

[gaga]

[gaga]

[WayneWWW]

Then what did you have under that path?

[gaga]

there is no bus@0 directory in the directory /proc/device-tree/

[WayneWWW]

Then what did you have in /proc/device-tree/…

[gaga]