[PATCH v3 3/4] PCI: dwc: Reduce DT reads by allocating host bridge via DWC glue driver

Krishna Chaitanya Chundru
2025-01-21T09:03:01Z

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@oss.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 3888f9fe5af1..0acf9db44f2c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -484,8 +484,8 @@ 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;

@@ -497,11 +497,12 @@ 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