From: Bjorn Helgaas <helgaas@kernel.org>
To: linux-pci@vger.kernel.org
Cc: "Vidya Sagar" <vidyas@nvidia.com>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Maciej W . Rozycki" <macro@orcam.me.uk>,
"David E . Box" <david.e.box@linux.intel.com>,
"Johan Hovold" <johan+linaro@kernel.org>,
"Heiner Kallweit" <hkallweit1@gmail.com>,
"Ajay Agarwal" <ajayagarwal@google.com>,
linux-kernel@vger.kernel.org,
"Bjorn Helgaas" <bhelgaas@google.com>
Subject: [PATCH] PCI/ASPM: Clarify that pcie_aspm=off means leave ASPM untouched
Date: Mon, 29 Apr 2024 14:18:21 -0500 [thread overview]
Message-ID: <20240429191821.691726-1-helgaas@kernel.org> (raw)
From: Bjorn Helgaas <bhelgaas@google.com>
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".
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
Documentation/admin-guide/kernel-parameters.txt | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index bb884c14b2f6..4bc281d6e8d3 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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.
--
2.34.1
next reply other threads:[~2024-04-29 19:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-29 19:18 Bjorn Helgaas [this message]
2024-05-01 20:07 ` [PATCH] PCI/ASPM: Clarify that pcie_aspm=off means leave ASPM untouched David E. Box
2024-05-03 16:46 ` Bjorn Helgaas
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