linux-kernel - [PATCH v2 3/4] PCI: dwc: Reduce DT reads by allocating host bridge via DWC glue driver

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Message-Id: <20241224-enable_ecam-v2-3-43daef68a901@oss.qualcomm.com>
Date: Tue, 24 Dec 2024 19:40:17 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: cros-qcom-dts-watchers@...omium.org,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_vpernami@...cinc.com,
        quic_mrana@...cinc.com, mmareddy@...cinc.com,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH v2 3/4] PCI: dwc: Reduce DT reads by allocating host bridge
 via DWC glue driver

Allow DWC glue drivers to allocate the host bridge, avoiding redundant
device tree reads primarily in dw_pcie_ecam_supported().

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 4e07fefe12e1..c3f464f128f0 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -479,8 +479,8 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	struct device *dev = pci->dev;
 	struct device_node *np = dev->of_node;
 	struct platform_device *pdev = to_platform_device(dev);
+	struct pci_host_bridge *bridge = pp->bridge;
 	struct resource_entry *win;
-	struct pci_host_bridge *bridge;
 	struct resource *res;
 	int ret;
 
@@ -492,11 +492,12 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 		return -ENODEV;
 	}
 
-	bridge = devm_pci_alloc_host_bridge(dev, 0);
-	if (!bridge)
-		return -ENOMEM;
-
-	pp->bridge = bridge;
+	if (!pp->bridge) {
+		bridge = devm_pci_alloc_host_bridge(dev, 0);
+		if (!bridge)
+			return -ENOMEM;
+		pp->bridge = bridge;
+	}
 
 	pp->cfg0_size = resource_size(res);
 	pp->cfg0_base = res->start;

-- 
2.34.1