How to awake the pcie0 device?

the PICE0 (c4 x4) is connected to XILINX FPGA GTX BANK(A7-1000/X0Y0),but this is necessory that GPU(ORIN NX 16G) need to load the FPGA, then ,we can find that the GPU cannot find the PCIE0 device when the board is powered, because the pcie0 enter to low-power mode before the GPU to load the FPGA.

here ,

1)How to awake the PCIE0 device after the GPU to load the FPGA ?

2)If it is possible that the PCIE is also non-low-power mode, then how to set?

please help to tell me.

thanks