qcacld-3.0: Add APIs to prevent and allow PCIe enter L1 state

Add PLD APIs to prevent and allow PCIe enter L1 state and L1ss
states.

Change-Id: If5cfb4938aa1e5db277d6a8a381a6a9b6f961bc2
CRs-fixed: 2621669

core/pld/inc/pld_common.h

@@ -427,6 +427,8 @@ void pld_get_default_fw_files(struct pld_fw_files *pfw_files);
 int pld_get_fw_files_for_target(struct device *dev,
 				struct pld_fw_files *pfw_files,
 				u32 target_type, u32 target_version);
+int pld_prevent_l1(struct device *dev);
+void pld_allow_l1(struct device *dev);
 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

@@ -588,6 +588,52 @@ int pld_get_fw_files_for_target(struct device *dev,
 	return ret;
 }
 
+/**
+ * pld_prevent_l1() - Prevent PCIe enter L1 state
+ * @dev: device
+ *
+ * Prevent PCIe enter L1 and L1ss states
+ *
+ * Return: 0 for success
+ *         Non zero failure code for errors
+ */
+int pld_prevent_l1(struct device *dev)
+{
+	int ret = 0;
+
+	switch (pld_get_bus_type(dev)) {
+	case PLD_BUS_TYPE_PCIE:
+		ret = pld_pcie_prevent_l1(dev);
+		break;
+	default:
+		ret = -EINVAL;
+		pr_err("Invalid device type\n");
+		break;
+	}
+
+	return ret;
+}
+
+/**
+ * pld_allow_l1() - Allow PCIe enter L1 state
+ * @dev: device
+ *
+ * Allow PCIe enter L1 and L1ss states
+ *
+ * Return: void
+ */
+void pld_allow_l1(struct device *dev)
+{
+	switch (pld_get_bus_type(dev)) {
+	case PLD_BUS_TYPE_PCIE:
+		pld_pcie_allow_l1(dev);
+		break;
+	default:
+		pr_err("Invalid device type\n");
+		break;
+	}
+}
+
 /**
  * pld_is_pci_link_down() - Notification for pci link down event
  * @dev: device

core/pld/src/pld_pcie.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2020 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -162,6 +162,15 @@ pld_pcie_get_fw_files_for_target(struct device *dev,
 	return 0;
 }
 
+static inline int pld_pcie_prevent_l1(struct device *dev)
+{
+	return 0;
+}
+
+static inline void pld_pcie_allow_l1(struct device *dev)
+{
+}
+
 static inline void pld_pcie_link_down(struct device *dev)
 {
 }
@@ -423,6 +432,16 @@ pld_pcie_smmu_map(struct device *dev,
 	return cnss_smmu_map(dev, paddr, iova_addr, size);
 }
 
+static inline int pld_pcie_prevent_l1(struct device *dev)
+{
+	return cnss_pci_prevent_l1(dev);
+}
+
+static inline void pld_pcie_allow_l1(struct device *dev)
+{
+	cnss_pci_allow_l1(dev);
+}
+
 static inline void pld_pcie_link_down(struct device *dev)
 {
 	cnss_pci_link_down(dev);