korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2025-01-06 05:44:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

PCI: Clear Secondary Status errors after enumeration

Browse Source 
We enumerate devices by attempting config reads to the Vendor ID of each
possible device.  On conventional PCI, if no device responds, the read
terminates with a Master Abort (PCI r3.0, sec 6.1).  On PCIe, the config
read is terminated as an Unsupported Request (PCIe r6.0, sec 2.3.2,
7.5.1.3.7).  In either case, if the read addressed a device below a bridge,
it is logged by setting "Received Master Abort" in the bridge Secondary
Status register.

Clear any errors logged in the Secondary Status register after enumeration.

Link: https://lore.kernel.org/r/20240116143258.483235-1-vidyas@nvidia.com
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
[bhelgaas: simplify commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Vidya Sagar 2024-01-16 20:02:58 +05:30 committed by Bjorn Helgaas
parent 4cece76496
commit 7bf9d2af7e
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

@ -1482,6 +1482,9 @@ 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);