FROMLIST: PCI: dwc: Implement .start_link(), .stop_link() hooks

Implement stop_link() and  start_link() function op for dwc drivers.

Link: https://lore.kernel.org/lkml/20250412-qps615_v4_1-v5-0-5b6a06132fec@oss.qualcomm.com/
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>

Author: krishnachaitanya-linux

drivers/pci/controller/dwc/pcie-designware-host.c

@@ -727,10 +727,28 @@ void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn,
 }
 EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
 
+static int dw_pcie_op_start_link(struct pci_bus *bus)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	return dw_pcie_host_start_link(pci);
+}
+
+static void dw_pcie_op_stop_link(struct pci_bus *bus)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	dw_pcie_host_stop_link(pci);
+}
+
 static struct pci_ops dw_pcie_ops = {
 	.map_bus = dw_pcie_own_conf_map_bus,
 	.read = pci_generic_config_read,
 	.write = pci_generic_config_write,
+	.start_link = dw_pcie_op_start_link,
+	.stop_link = dw_pcie_op_stop_link,
 };
 
 static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)