PCI/ASPM: Don't retrain link if ASPM not possible

Browse source

Some (defective) PCIe devices are not able to reliably do link retraining.

Check to see if ASPM is possible between link partners before configuring
common clocking, and doing the resulting link retraining.  If ASPM is not
possible, there is no reason to risk losing access to a device due to an
unnecessary link retraining.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

...

This commit is contained in:

David Daney 2016-11-17 14:25:01 -08:00 • committed by Bjorn Helgaas

parent fc4f57fade

commit e53f9a28be

1 changed files with 16 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

20

drivers/pci/pcie/aspm.c

View file