VIM3L: PCIE RC Power Save modes and Interrupt Modes

We are planning to use VIM3L board for a external PCIE device bringup with Android.
We wanted to know what are the power save modes supported by RC

  1. Is L1SS (ASPM) supported?
  2. Is L2 (low power) mode supported?

If yes, is it supported in both 4.19 and 5.4 kernels?

Also please let us know which interrupt mode is supported in PCIE RC
MSI or INTX or both?