@@ -1340,6 +1340,22 @@ static int aer_probe(struct pcie_device *dev)
return 0;
}
+static int aer_suspend(struct pcie_device *dev)
+{
+ struct aer_rpc *rpc = get_service_data(dev);
+
+ aer_disable_rootport(rpc);
+ return 0;
+}
+
+static int aer_resume(struct pcie_device *dev)
+{
+ struct aer_rpc *rpc = get_service_data(dev);
+
+ aer_enable_rootport(rpc);
+ return 0;
+}
+
/**
* aer_root_reset - reset Root Port hierarchy, RCEC, or RCiEP
* @dev: pointer to Root Port, RCEC, or RCiEP
@@ -1411,6 +1427,8 @@ static struct pcie_port_service_driver aerdriver = {
.service = PCIE_PORT_SERVICE_AER,
.probe = aer_probe,
+ .suspend = aer_suspend,
+ .resume = aer_resume,
.remove = aer_remove,
};
BugLink: https://bugs.launchpad.net/bugs/2033025 When the power rail gets cut off, the hardware can create some electric noise on the link that triggers AER. If IRQ is shared between AER with PME, such AER noise will cause a spurious wakeup on system suspend. When the power rail gets back, the firmware of the device resets itself and can create unexpected behavior like sending PTM messages without PTM being enabled. For this case, the driver will always be too late to toggle off features should be off. As Per PCIe Base Spec 5.0, section 5.2, titled "Link State Power Management", TLP and DLLP transmission are disabled for a Link in L2/L3 Ready (D3hot), L2 (D3cold with aux power) and L3 (D3cold) states. So if the power will be turned off during suspend process, disable AER service and re-enable it during the resume process. This should not affect the basic functionality. This patch was in the Ubuntu kernel but was dropped later in the hope of upstream version would come to light soon. However, the patch is still under discussion, and PCI maintainer and reviewers don't have a concensus on the final approach (D3hot vs D3cold), so let's reinstate the fix until upstream has a final version. Link: https://bugzilla.kernel.org/show_bug.cgi?id=209149 Link: https://bugzilla.kernel.org/show_bug.cgi?id=216295 Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> --- drivers/pci/pcie/aer.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)