Customer board can't link with PCIe 5GT/s. It happens in their application that connecting AM5746(EP)---AM5746(RC).
Customer checked PCIECTRL_TI_CONF_DEVICE_CMD (0x51002104) register because find the cause.
RC's register change was confirmed.
NG: 0x0000 0000 -> 0000 0000
OK: 0x0000 0000 -> 0000 0045
They checked PDK driver, but they didn't find any processing that set LTSSM_EN Field to 1.
We assume that HW set this field to 0.
Is LTSSM_EN set to 0 due to external factors?
Would you tell me how to retry if link fail (=LTSSM_EN:0)?