Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-20 23:13:00 +00:00
Code Issues Packages Projects Releases Wiki Activity

PCI: Clear PCI_STATUS when setting up device

Browse Source 
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>
This commit is contained in:
Kai-Heng Feng 2022-05-17 12:37:38 +08:00 committed by Bjorn Helgaas
parent 5e69a33c5c
commit 6cd514e58f
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/pci/probe.c
View File

@ -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)