linux-kernel - [PATCH 2/2] PCI: qcom: Enable D3 support for the recent PCI bridges

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Date: Fri, 02 Feb 2024 12:24:18 +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 2/2] PCI: qcom: Enable D3 support for the recent PCI
 bridges

Make use of the "bridge_d3_capable" flag to specify the D3 capability to
the PCI core so that the D3 support (in turn runtime PM) will be enabled
for the PCI bridges.

Currently, only for the recent bridges with PID "0x0110", this flag is set
as a fixup. Because, there is no guarantee that the older bridges will
support D3.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 10f2d0bb86be..a6ae78d2ce92 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1649,6 +1649,11 @@ static void qcom_fixup_class(struct pci_dev *dev)
 {
 	dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
 }
+
+static void qcom_fixup_bridge_d3_capability(struct pci_dev *dev)
+{
+	dev->bridge_d3_capable = true;
+}
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0106, qcom_fixup_class);
@@ -1656,6 +1661,7 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0107, qcom_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0302, qcom_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1000, qcom_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1001, qcom_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0110, qcom_fixup_bridge_d3_capability);
 
 static const struct dev_pm_ops qcom_pcie_pm_ops = {
 	NOIRQ_SYSTEM_SLEEP_PM_OPS(qcom_pcie_suspend_noirq, qcom_pcie_resume_noirq)

-- 
2.25.1