linux-kernel - [PATCH 0/2] Enable D3 support for Qualcomm bridges

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Date: Fri, 02 Feb 2024 12:24:16 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>
Cc: Lukas Wunner <lukas@...ner.de>, 
 Mika Westerberg <mika.westerberg@...ux.intel.com>, quic_krichai@...cinc.com, 
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 0/2] Enable D3 support for Qualcomm bridges

Hello,

This series enables D3 support for PCI bridges found in Qcom SoCs. Currently,
PCI core will enable D3 support for PCI bridges only when the following
conditions are met:

1. Platform is ACPI based
2. Thunderbolt controller is used
3. pcie_port_pm=force passed in cmdline

While options 1 and 2 do not apply to Qcom SoCs, option 3 will make the life
harder for distro maintainers. Due to this, runtime PM is also not getting
enabled for the bridges.

Ideally, D3 support should be enabled by default for the recent PCI bridges,
but we do not have a sane way to detect them. So this series adds a new flag
"bridge_d3_capable" to "struct pci_dev" which could be set by the bridge drivers
for capable devices. This will allow the PCI core to enable D3 support for the
bridges during enumeration.

In the Qcom controller driver, this flag is only set for recent bridges with PID
(0x0110).

Testing
=======

This series is tested on SM8450 based development board.

- Mani

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---

---
Manivannan Sadhasivam (2):
      PCI: Add a flag to enable D3 support for PCI bridges
      PCI: qcom: Enable D3 support for the recent PCI bridges

 drivers/pci/controller/dwc/pcie-qcom.c | 6 ++++++
 drivers/pci/pci.c                      | 3 +++
 include/linux/pci.h                    | 1 +
 3 files changed, 10 insertions(+)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20240131-pcie-qcom-bridge-b6802a9770a3

Best regards,
-- 
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>