Voltage of SDIO clk drops from 1.8V to 1.2V

We use sdio bus to connect wifi on NX platform, but voltage of clk drops from 1.8V to 1.2V suddenly.
I want to know whether or not the sdio-controller do this action?

We don’t verify WIFI SDIO on Xavier series. It may not work properly. Cold you check if you can switch to other interface such as PCIe?

We want to have a try.
So can you tell me how to increase to the driving ability of sdio?
I doubt insufficient driving ability causes the voltage of clk to drop from 1.8V to 1.2V abnormally.