qcacmn: Reset the Runtime PM state when exiting

qcacld-2.0 to qcacld-3.0 propagation
Add prevent method to reset the Runtime PM state before driver
unload to ensure Runtime PM is recovered by driver load.

Change-Id: I5fccc345e5217d1a26c3c4f0cda1dca5ee71004c
CRs-Fixed: 899522

hif/src/pcie/if_pci.c

@@ -1127,6 +1127,34 @@ static void hif_pm_runtime_open(struct hif_pci_softc *sc)
 	INIT_LIST_HEAD(&sc->prevent_suspend_list);
 }
 
+/**
+ * hif_pm_runtime_sanitize_on_exit(): sanitize the pm usage count and state
+ * @sc: pci context
+ *
+ * Ensure we have only one vote against runtime suspend before closing
+ * the runtime suspend feature.
+ *
+ * all gets by the wlan driver should have been returned
+ * one vote should remain as part of cnss_runtime_exit
+ *
+ * needs to be revisited if we share the root complex.
+ */
+static void hif_pm_runtime_sanitize_on_exit(struct hif_pci_softc *sc)
+{
+	if (atomic_read(&sc->dev->power.usage_count) != 1)
+		hif_pci_runtime_pm_warn(sc, "Driver UnLoaded");
+
+	/* ensure 1 and only 1 usage count so that when the wlan
+	 * driver is re-insmodded runtime pm won't be
+	 * disabled also ensures runtime pm doesn't get
+	 * broken on by being less than 1.
+	 */
+	if (atomic_read(&sc->dev->power.usage_count) <= 0)
+		atomic_set(&sc->dev->power.usage_count, 1);
+	while (atomic_read(&sc->dev->power.usage_count) > 1)
+		hif_pm_runtime_put_auto(sc->dev);
+}
+
 /**
  * hif_pm_runtime_close(): close runtime pm
  * @sc: pci bus handle
@@ -1139,6 +1167,8 @@ static void hif_pm_runtime_close(struct hif_pci_softc *sc)
 		return;
 	else
 		hif_pm_runtime_stop(sc);
+
+	hif_pm_runtime_sanitize_on_exit(sc);
 }