How to tune HDMI's drive strength or pre-emphasis parameters easily

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi.

I ran HDMI compliance test, then resulted an eye diagram error.
So I want to tune the drive strengths and pre-emphasis settings and TMDS internal termination.
These parameters are defined in device-tree’s node “host1x/sor/prod-settings/prod_c_hdmi_foo_bar”.
I am going to following steps.
  1. Change these parameters in dtsi file
  2. Make dtb
  3. Do ./flash.sh
  4. Run HDMI compliance test again
  If the test fails, retry first step.

But this way should takes some time.
Do you know how to easily tune it? If possible I would like to tune it on TX2’s Linux.

2

Hi,
Use register read write tool like devmem2 or reg change the register value you want to tune may also work.
Check TRM to get register address.

3

Hello, JimWang.Thank you for your reply.

I was able to tune registers using devmem2.
Thank you!