If a downstream port has a PCIe switch connected to it, the enumeration process leaves the 'Received Master Abort' bit set in the Secondary Status Register of the downstream port because of the Unsupported Requests (URs) take place in the downstream hierarchy. Since the ownership of Secondary Status Register always lies with the OS including systems with Firmware-First approach for error handling[1], clear the error status bits in the Secondary Status Register post enumeration. [1] https://lore.kernel.org/all/1fb9d746-0695-4d19-af98-f442f31cd464@xxxxxxxxxx/T/ Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx> --- drivers/pci/probe.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 43159965e09e..edf8202465d8 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1470,6 +1470,9 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev, } out: + /* Clear errors in the Secondary Status Register */ + pci_write_config_word(dev, PCI_SEC_STATUS, 0xffff); + pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); pm_runtime_put(&dev->dev); -- 2.25.1
