From: Kai-Heng Feng <kai.heng.feng@canonical.com> Date: Tue, 17 May 2022 04:37:38 +0000 (+0800) Subject: PCI: Clear PCI_STATUS when setting up device X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6cd514e58f12;p=linux.git PCI: Clear PCI_STATUS when setting up device We are seeing Master Abort bit is set on Intel I350 ethernet device and its root port right after boot, probably happened during BIOS phase: 00:06.0 PCI bridge [0604]: Intel Corporation Device [8086:464d] (rev 05) (prog-if 00 [Normal decode]) Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- 6e:00.0 Ethernet controller [0200]: Intel Corporation I350 Gigabit Network Connection [8086:1521] (rev 01) Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- The Master Abort bit is cleared after S3. Since there's no functional impact found, clear the PCI_STATUS to treat it anew at setting up. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215989 Link: https://lore.kernel.org/r/20220517043738.2308499-1-kai.heng.feng@canonical.com Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> --- diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 17a969942d370..414f659dc8735 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1890,6 +1890,9 @@ int pci_setup_device(struct pci_dev *dev) dev->broken_intx_masking = pci_intx_mask_broken(dev); + /* Clear errors left from system firmware */ + pci_write_config_word(dev, PCI_STATUS, 0xffff); + switch (dev->hdr_type) { /* header type */ case PCI_HEADER_TYPE_NORMAL: /* standard header */ if (class == PCI_CLASS_BRIDGE_PCI)