HDMI settings (frequency for EMC tests)

Hello,

we are using a NVIDIA Jetson Xaviar AGX in our device. During a electromagnetic compatibility test a problem encountered if the HDMI interface was connected to the touch screen. The EMC test results are promising if we don’t use the HDMI connection.

Is there a way to manipulate the frequencies of the HDMI interface?
Is is possible to enable frequency spreading on HDMI?

Thanks

There is a tuning guide doc in DLC, you can check that first.
https://developer.nvidia.com/jetson-agx-xavier-series-tuning-and-compliance-guide-application-note

Thanks for the really interesting document.

Is there a DLC or some “How-To” that explains how to set the register values for HDMI (Table 17/18)?

Hi,

Do you mean you want to fix this value after kernel is up? If so, there is a prod setting in device tree.

hardware/nvidia/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-prod.dtsi

You need to firstly download the kernel source from our DLC and then rebuild the dts file to dtb.