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PCI/ASPM: Clarify that pcie_aspm=off means leave ASPM untouched

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Previously we claimed "pcie_aspm=off" meant that ASPM would be disabled,
which is wrong.

Correct this to say that with "pcie_aspm=off", Linux doesn't touch any ASPM
configuration at all.  ASPM may have been enabled by firmware, and that
will be left unchanged.  See "aspm_support_enabled".

Link: https://lore.kernel.org/r/20240429191821.691726-1-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: David E. Box <david.e.box@linux.intel.com>
This commit is contained in:
Bjorn Helgaas 2024-04-29 14:18:21 -05:00
parent 4cece76496
commit 2e0239d47d
1 changed files with 3 additions and 2 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
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@ -4590,9 +4590,10 @@
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.