linux-kernel - [PATCH 0/2] PCI: qcom: Switch to bus notifier for enabling ASPM of PCI devices

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Message-Id: <20250714-aspm_fix-v1-0-7d04b8c140c8@oss.qualcomm.com>
Date: Mon, 14 Jul 2025 23:31:03 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
        stable@...r.kernel.org
Subject: [PATCH 0/2] PCI: qcom: Switch to bus notifier for enabling ASPM of
 PCI devices

Hi,

This series switches the Qcom PCIe controller driver to bus notifier for
enabling ASPM (and updating OPP) for PCI devices. This series is intented
to fix the ASPM regression reported (offlist) on the Qcom compute platforms
running Linux. It turned out that the ASPM enablement logic in the Qcom
controller driver had a flaw that got triggered by the recent changes to the
pwrctrl framework (more details in patch 1/1).

Testing
-------

I've tested this series on Thinkpad T14s laptop and able to observe ASPM state
changes (through controller debugfs entry and lspci) for the WLAN device.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
---
Manivannan Sadhasivam (2):
      PCI: qcom: Switch to bus notifier for enabling ASPM of PCI devices
      PCI: qcom: Move qcom_pcie_icc_opp_update() to notifier callback

 drivers/pci/controller/dwc/pcie-qcom.c | 73 ++++++++++++++++++----------------
 1 file changed, 38 insertions(+), 35 deletions(-)
---
base-commit: 00f0defc332be94b7f1fdc56ce7dcb6528cdf002
change-id: 20250714-aspm_fix-eed392631c8f

Best regards,
-- 
Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>