Does nvidia has some software tools to disable HPD of HDMI in Jetson Xavier?

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi ,
I am studing how to tuning HDMI in Xavier and I saw some infomation on page 42 of “Jetson Xavier NX Series HDMI Tuning Guide”(DA -09890-001_v1.2).
We want to disable “Hot Plug Detect” of HDMI but we don’t know how to do it . Do you have software tools to do that?

Cheers,
Patrick

3

I am not quite sure what kind of “disable hotplug detect” do you want to achieve here.

Can you elaborate it?

I guess you can remove “nvidia,hpd-gpio” from the device tree and it will have no hotplug gpio.

4

We want to verify eye diagram of HDMI according description on page 42 of “Jetson Xavier NX Series HDMI Tuning Guide”(DA -09890-001_v1.2) " as below .

DUT2
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in “Method #1” , we don’t know how to control HPD pin . We posed this question to our agent and he said that he has no experience in HDMI. This is our first time to verify HDMI device . If you have some tools that can be used to set the HPD pin, please share these tools with us .

Cheers,
Patrick

5

Oh ok, that document means modifying the pinmux setting.

Please download the pinmux spreadsheet.

https://developer.nvidia.com/embedded/downloads#?search=spreadsheet

Modify the HPD to TRISTATE.

And follow the document to create a pinmux cfg file and flash it to your board.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/adaptation_and_bringup_xavier.html#wwpID0E0XN0HA

7

Hi WayneWWW,

Thank you for all your assistance .

cheers,
Patrick