Open
Description
We've run across an interesting device that's failing to train on POWER9. It's a PCIe to PCI bridge built around the PI7C9X130 chip, it looks solidly constructed and appears to be powered up correctly, but skiboot fails to train the link:
[ 58.229791464,5] PCI: Resetting PHBs and training links...
[ 60.243078664,3] PHB#0001[0:1]: LINK: Timeout waiting for link up
[ 62.447106167,3] PHB#0001[0:1]: LINK: Timeout waiting for link up
[ 65.139140552,3] PHB#0001[0:1]: LINK: Timeout waiting for link up
[ 67.343171186,3] PHB#0001[0:1]: LINK: Timeout waiting for link up
[ 67.343232661,3] PHB#0001[0:1]: Electrical link detected but won't train
[ 67.343692522,5] PCI: Probing slots...
What additional information do you need to debug?