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pci-v6.9-fixes-2

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Merge tag 'pci-v6.9-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull pci fixes from Bjorn Helgaas:

 - Update kernel-parameters doc to describe "pcie_aspm=off" more
   accurately (Bjorn Helgaas)

 - Restore the parent's (not the child's) ASPM state to the parent
   during resume, which fixes a reboot during resume (Kai-Heng Feng)

* tag 'pci-v6.9-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  PCI/ASPM: Restore parent state to parent, child state to child
  PCI/ASPM: Clarify that pcie_aspm=off means leave ASPM untouched
This commit is contained in:
Linus Torvalds 2024-05-08 09:37:58 -07:00
commit 1ab1a19db1
2 changed files with 5 additions and 4 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
View File

@ -4594,9 +4594,10 @@
norid [S390] ignore the RID field and force use of
one PCI domain per PCI function
pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
pcie_aspm= [PCIE] Forcibly enable or ignore PCIe Active State Power
Management.
off Disable ASPM.
off Don't touch ASPM configuration at all. Leave any
configuration done by firmware unchanged.
force Enable ASPM even on devices that claim not to support it.
WARNING: Forcing ASPM on may cause system lockups.

4
drivers/pci/pcie/aspm.c
View File

@ -177,8 +177,8 @@ void pci_restore_aspm_l1ss_state(struct pci_dev *pdev)
/* Restore L0s/L1 if they were enabled */
if (FIELD_GET(PCI_EXP_LNKCTL_ASPMC, clnkctl) ||
FIELD_GET(PCI_EXP_LNKCTL_ASPMC, plnkctl)) {
pcie_capability_write_word(parent, PCI_EXP_LNKCTL, clnkctl);
pcie_capability_write_word(pdev, PCI_EXP_LNKCTL, plnkctl);
pcie_capability_write_word(parent, PCI_EXP_LNKCTL, plnkctl);
pcie_capability_write_word(pdev, PCI_EXP_LNKCTL, clnkctl);
}
}