How to prevent PCIe HIP from entering L2 low power state?

Description

In some scenarios, issues may arise when the PCIe HIP enters L2 low power state.

Some symptoms may include:
   -LTSSM being stuck in L2 low power state
   -PCIe enumeration issues after entering L2

Resolution

There are two methods that a user can use to address issues when the PCI Express HIP enters L2 low power state.

To prevent the PCI Express HIP from entering L2 low power state.
- Tie pme_to_cr to 1\'b0.

Another way to address the issue is to implement user logic that will reset the PCIe core when the LTSSM goes to L2.idle.

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