PCI-E bus de-emphasis too strong in kernel 3.10.40

Hello,

We have tegra tk1 and like to update its network connectivity using Realtek 88x2be networks card.
The problem is the eye diagram fail due to de-emphasis too strong.

I would like to know how to change the de-emphasis value from the kernel source.

Could anyone help me answer the question?

I can’t tell you how to change de-emphasis, but I do recall seeing people having done so via kernel edits while searching for noise sources interfering with some wireless application. Here is a post which notes one way to do this (it isn’t complete information, you’d have to grep source):
https://devtalk.nvidia.com/default/topic/1000391/jetson-tx1/pcie-clock-rates-and-power-management/post/5116860/#5116860