Bug 751320

Description of problem:

Hotplugging fails with 'pciehp: hpc_check_lnk_status : Link
Training Error occurs'

Version-Release number of selected component (if applicable):

pciehp: PCI Express Hot Plug Controller
Driver version: 0.4

How reproducible:

I am trying to hotplug an AdvancedTCA Mezzanine card in Kontron AT8402 carrier. I tried in both RHEL5 up 0 and 3 as well as SLES 10 where hotplug fails is all three. The OS's were 32 bit.

Steps to Reproduce:

1. I enable hotplug in the ATCA carrier setting and push the hotplug module by modprobe pciehp pciehp_force=1

(pusing acpiphp givs, FATAL: Error inserting acpiphp (/lib/modules/2.6.9-55.ELsmp/kernel/drivers/pci/hotplug/acpiphp.ko): No such device
)

After pusing pciehp,

dmesg:

Jan  1 00:05:41 atca_node1 kernel: pciehp: HPC vendor_id 8086 device_id
2690 ss_vid 0 ss_did 0
Jan  1 00:05:41 atca_node1 kernel: pciehp: HPC vendor_id 10b5 device_id
8532 ss_vid 0 ss_did 0
Jan  1 00:05:44 atca_node1 last message repeated 4 times
Jan  1 00:05:44 atca_node1 kernel: pciehp: PCI Express Hot Plug Controller
Driver version: 0.4

lsmod:
pciehp                 41245  0

2. I hotplug the AMC card in a bay. The the card seems to get power as the status light goes green (also seen from dmesg below) but lspci does not list that board. The board is not usable.

dmesg:

Jan  1 00:07:14 atca_node1 kernel: pciehp: Latch close on Slot(0010_0000)
Jan  1 00:07:14 atca_node1 kernel: pciehp: Button pressed on
Slot(0010_0000)
Jan  1 00:07:14 atca_node1 kernel: pciehp: Card present on Slot(0010_0000)
Jan  1 00:07:14 atca_node1 kernel: pciehp: PCI slot #0010_0000 - powering
on due to button press.
Jan  1 00:07:24 atca_node1 kernel: pciehp: hpc_check_lnk_status : Link
Training Error occurs
Jan  1 00:07:24 atca_node1 kernel: pciehp: board_added: Failed to check
link status
  

Actual results:

Expected results:

It seems that the hotplug module is not reading any PCI interrupt and hence the card is disabled.

Please any idea/suggestion on what might be going wrong here and how to resole this?

Thanks very much,
Additional info: