From: Kai-Heng Feng kai.heng.feng@canonical.com
[ Upstream commit 5afc2f763edc5daae4722ee46fea4e627d01fa90 ]
If the link is powered off during suspend, electrical noise may cause errors that are logged via AER. If the AER interrupt is enabled and shares an IRQ with PME, that causes a spurious wakeup during suspend.
Disable the AER interrupt during suspend to prevent this. Clear error status before re-enabling IRQ interrupts during resume so we don't get an interrupt for errors that occurred during the suspend/resume process.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=209149 Link: https://bugzilla.kernel.org/show_bug.cgi?id=216295 Link: https://bugzilla.kernel.org/show_bug.cgi?id=218090 Link: https://lore.kernel.org/r/20240416043225.1462548-2-kai.heng.feng@canonical.c... Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com [bhelgaas: drop pci_ancestor_pr3_present() etc, commit log] Signed-off-by: Bjorn Helgaas bhelgaas@google.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/pcie/aer.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index ac6293c249766..13b8586924ead 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1497,6 +1497,22 @@ 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 @@ -1561,6 +1577,8 @@ static struct pcie_port_service_driver aerdriver = { .service = PCIE_PORT_SERVICE_AER,
.probe = aer_probe, + .suspend = aer_suspend, + .resume = aer_resume, .remove = aer_remove, };