qcacld-3.0: Add support for PCIE gen switch

Add PLD layer functions to facilitate PCIE gen switch using
cnss platform driver APIs.

Change-Id: Ie1a3273fa8949131937f43d3551cb500a033d59d
CRs-fixed: 2744991

core/pld/inc/pld_common.h

@@ -440,6 +440,18 @@ int pld_get_fw_files_for_target(struct device *dev,
 				u32 target_type, u32 target_version);
 int pld_prevent_l1(struct device *dev);
 void pld_allow_l1(struct device *dev);
+
+/**
+ * pld_set_pcie_gen_speed() - Set PCIE gen speed
+ * @dev: device
+ * @pcie_gen_speed: Required PCIE gen speed
+ *
+ * Send required PCIE Gen speed to platform driver
+ *
+ * Return: 0 for success. Negative error codes.
+ */
+int pld_set_pcie_gen_speed(struct device *dev, u8 pcie_gen_speed);
+
 void pld_is_pci_link_down(struct device *dev);
 int pld_shadow_control(struct device *dev, bool enable);
 void pld_schedule_recovery_work(struct device *dev,

core/pld/src/pld_common.c

@@ -642,6 +642,21 @@ void pld_allow_l1(struct device *dev)
 	}
 }
 
+int pld_set_pcie_gen_speed(struct device *dev, u8 pcie_gen_speed)
+{
+	int ret = -EINVAL;
+
+	switch (pld_get_bus_type(dev)) {
+	case PLD_BUS_TYPE_PCIE:
+		ret = pld_pcie_set_gen_speed(dev, pcie_gen_speed);
+		break;
+	default:
+		pr_err("Invalid device type\n");
+		break;
+	}
+	return ret;
+}
+
 /**
  * pld_is_pci_link_down() - Notification for pci link down event
  * @dev: device

core/pld/src/pld_pcie.h

@@ -171,6 +171,12 @@ static inline void pld_pcie_allow_l1(struct device *dev)
 {
 }
 
+static inline int pld_pcie_set_gen_speed(struct device *dev, u8 pcie_gen_speed)
+{
+	return 0;
+}
+
+
 static inline void pld_pcie_link_down(struct device *dev)
 {
 }
@@ -448,6 +454,20 @@ static inline void pld_pcie_allow_l1(struct device *dev)
 	cnss_pci_allow_l1(dev);
 }
 
+/**
+ * pld_pcie_set_gen_speed() - Wrapper for platform API to set PCIE gen speed
+ * @dev: device
+ * @pcie_gen_speed: PCIE gen speed required
+ *
+ * Send required PCIE Gen speed to platform driver
+ *
+ * Return: 0 for success. Negative error codes.
+ */
+static inline int pld_pcie_set_gen_speed(struct device *dev, u8 pcie_gen_speed)
+{
+	return cnss_set_pcie_gen_speed(dev, pcie_gen_speed);
+}
+
 static inline void pld_pcie_link_down(struct device *dev)
 {
 	cnss_pci_link_down(dev);