TCI6638K2K: Keystone SERDES (PHY-B) Near-end loobpack

Part Number: TCI6638K2K

Hi,

I have used Far-end parallel loopback (LB_FEP) mode on Keystone SERDES.

But I can't set up Near-end serial loopback (LB_NES) mode.

According to SERDES user guide, I am just required to set NES_LB_ENA_O to 0x1 in Lane_000.

In case of LB_FEP, I added the setting sequence inside k2serdes_config() function.

Where should I put the line of setting NES_LB_ENA_O ?