PCIe link down on R-Car Salvator-xs Yocto AGL

I am working on R-Car Salvator-XS board. I have flashed Yocto AGL on the board, but I am not able to verify pcie related operations. I am getting following logs while booting.

[    3.007352] rcar-pcie fe000000.pcie: PCIe link down
[    3.007454] rcar-pcie ee800000.pcie: no pcie3v3 regulator found
[    3.007458] rcar-pcie ee800000.pcie: no pcie1v8 regulator found
[    3.007459] OF: PCI: host bridge /soc/pcie@ee800000 ranges:
[    3.007470] OF: PCI:    IO 0xee900000..0xee9fffff -> 0x00000000
[    3.007476] OF: PCI:   MEM 0xeea00000..0xeebfffff -> 0xeea00000
[    3.007482] OF: PCI:   MEM 0xc0000000..0xc7ffffff -> 0xc0000000
[    3.007485] OF: PCI:   MEM 0xc8000000..0xcfffffff -> 0xc8000000
[    3.057569] rcar-pcie ee800000.pcie: PCIe link down

I have tried to set device tree in U-boot but still same logs are listing. My Approach was

setenv bootargs console=ttySC0,115200 ignore_loglevel vmalloc=384M video=HDMI-A-1:1920x1080-32@60 root=/dev/mmcblk1p1 rw rootfstype=ext4 rootwait rootdelay=2

setenv bootcmd run load_ker\; run load_dtb\; booti 0x48080000 - 0x48000000

setenv load_ker ext4load mmc 0:1 0x48080000 /boot/Image

setenv load_dtb ext4load mmc 0:1 0x48000000 /boot/r8a7795-salvator-xs.dtb

Please help me If I am missing anything or doing wrong.