Change De-emphasis level for PCIe in NVIDIA Jetson Xavier NX

Hi there,

Is it possible to change the de-emphasis level on Nvidia Jetson Xavier NX?

I tried changing the kernel source and edited the pcie-tegra.c file to change the de-emp level inside tegra_pcie_dw_host_init() function. Till the end of the function the 20th bit, which is for SEL_DEEMPHASIS (if I am not wrong), in PORT_LOGIC_GEN2_CTRL remains 1.

But somehow, in lspci -vvv output, it stays at -6 dB.

I have looked at other posts, but it doesn’t clarify my doubts.

Kernel version: 4.9.253-tegra