SPRUJ52C june 2022 – july 2023 AM69 , AM69A , TDA4AH-Q1 , TDA4AP-Q1 , TDA4VH-Q1 , TDA4VP-Q1
As per PCIe Base Specifications, Root Port ports only receive interrupts. There is no mechanism to generate interrupts from RP port to EP mode as per PCIe specification.
However, PCIe subsystem does support generation of interrupts from RP to EP. The downstream interrupts described in Section 12.2.3.3.4.3.1, PCIe Core Downstream Interrupts provides a mechanism for the RP to generate software triggered interrupts to the EP.