From: Bjorn Helgaas <helgaas@kernel.org>
To: linux-pci@vger.kernel.org
Cc: "Vidya Sagar" <vidyas@nvidia.com>,
"Saheed O . Bolarinwa" <refactormyself@gmail.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Rajat Jain" <rajatja@google.com>,
"Kenneth R . Crudup" <kenny@panix.com>,
"Kai-Heng Feng" <kai.heng.feng@canonical.com>,
"Abhishek Sahu" <abhsahu@nvidia.com>,
"Thierry Reding" <treding@nvidia.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Krishna Thota" <kthota@nvidia.com>,
"Manikanta Maddireddy" <mmaddireddy@nvidia.com>,
"Vidya Sagar" <sagar.tv@gmail.com>,
sagupta@nvidia.com, linux-kernel@vger.kernel.org,
"Bjorn Helgaas" <bhelgaas@google.com>
Subject: [PATCH 0/3] PCI/ASPM: Fix L1SS issues
Date: Tue, 4 Oct 2022 21:58:06 -0500 [thread overview]
Message-ID: <20221005025809.2247547-1-helgaas@kernel.org> (raw)
From: Bjorn Helgaas <bhelgaas@google.com>
This is really late, but I think we have two significant issues with L1SS:
1) pcie_aspm_cap_init() reads from the L1SS capability even when it
doesn't exist, so it reads PCI_COMMAND and PCI_STATUS instead and treats
those as an L1SS Capability value.
2) encode_l12_threshold() encodes LTR_L1.2_THRESHOLD as smaller than
requested, so ports may enter L1.2 when they should not.
These patches are intended to fix both issues.
Bjorn Helgaas (3):
PCI/ASPM: Factor out L1 PM Substates configuration
PCI/ASPM: Ignore L1 PM Substates if device lacks capability
PCI/ASPM: Correct LTR_L1.2_THRESHOLD computation
drivers/pci/pcie/aspm.c | 155 +++++++++++++++++++++++-----------------
1 file changed, 90 insertions(+), 65 deletions(-)
--
2.25.1
next reply other threads:[~2022-10-05 2:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-05 2:58 Bjorn Helgaas [this message]
2022-10-05 2:58 ` [PATCH 1/3] PCI/ASPM: Factor out L1 PM Substates configuration Bjorn Helgaas
2022-10-05 2:58 ` [PATCH 2/3] PCI/ASPM: Ignore L1 PM Substates if device lacks capability Bjorn Helgaas
2022-10-05 3:26 ` Sathyanarayanan Kuppuswamy
2022-10-05 11:07 ` Bjorn Helgaas
2022-10-05 2:58 ` [PATCH 3/3] PCI/ASPM: Correct LTR_L1.2_THRESHOLD computation Bjorn Helgaas
2022-10-05 3:28 ` [PATCH 0/3] PCI/ASPM: Fix L1SS issues Sathyanarayanan Kuppuswamy
2022-10-05 17:57 ` Bjorn Helgaas
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