SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
Whenever link goes from connected to disconnected state, the PCIe subsystem requires re-initialization based on the events occurring in PCIe core. A request for reset is typically going to be issued and will manifest as a link down interrupt. Since loopback requires transitions through link connect and disconnect, it will generate a link down interrupts. Typically, issuing the warm reset (module reset for CBA) would be sufficient.