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J721EXSOMXEVM: PCIe - Unstable enumeration of End point

Part Number: J721EXSOMXEVM

Hello,

We have PCIe EP device connected to J7 RC via PCIe switch. Sometimes in J7 device, I see that EP device is enumerating is fine (like below) but sometimes, enumeration doesn't show up. Sometimes restarting J7 I see EP device shows up. Sometimes it takes two power cycles of J7 when I see EP device enumeration.

root@j7-evm:~# lspci
03:00.0 Class ff00: 17cb:0306

How to find the root cause of this issue?

How to manually scan the PCIe device?

Thanks,

Satish