HDMI_DDC_SCL Clock Change

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

Hello,

My development environment is as follows.

  • Hardware Platform - Custom Jetson Xavier NX
  • JetPack Version - 4.5
  • L4T - 32.5

I want to change HDMI_DDC_SCL’s clock.
I know to change the clock with the following command:

cat /sys/bus/i2c/devices/i2c-0/bus_clk_rate
echo 400000 > /sys/bus/i2c/devices/i2c-0/bus_clk_rate

Where do I need to modify the Kernel source?

3

May I know what is your purpose to change this value?

The clock-frequency in the device tree should be able to change this.

4

HDMI EDID is not recognized by certain monitors.
The recommended frequency for the level shift chip is 400kHz. (nx custom board)

5

Confirmed.
It was in a file in the following path:
But making corrections requires thought.

hardware/nvidia/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-i2c.dtsi

7

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