AM5716: How to disable MDIO Polling mode

Part Number: AM5716

Hi 

Customer met issue when they connect the CPSW to external Realtek switch. 

They initialize the Realtek switch using the AM5716's MDIO, and  encounter intermittent switch port link failures. After debugging, they found it's related to polling on the MDIO bus of the SOC.

Realtek captured data from the MDIO bus and discovered that polling frames were being inserted when they indirectly wrote to the internal PHY registers. Importing this data into Realtek demo board can also reproduced the problem.

Removing the polling data and import will resolved the issue, so Realtek insisted that polling be disabled.

So they want to check if there is a way to disable this Polling mode.

Thanks

Zekun