qcacld-3.0: Prevent runtime suspend when linkdown not allowed

Runtime suspend does not save power in d0 mode.

Change-Id: I6bc83923a6384c3275b95bd0ffbb4404d9a3f86d
CRs-Fixed: 935300

core/hif/src/hif_main.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2016 The Linux Foundation. All rights reserved.
  *
  * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
  *
@@ -292,7 +292,7 @@ void hif_vote_link_down(void)
 
 	scn->linkstate_vote--;
 	if (scn->linkstate_vote == 0)
-		hif_bus_prevent_linkdown(false);
+		hif_bus_prevent_linkdown(scn, false);
 }
 
 /**
@@ -313,7 +313,7 @@ void hif_vote_link_up(void)
 
 	scn->linkstate_vote++;
 	if (scn->linkstate_vote == 1)
-		hif_bus_prevent_linkdown(true);
+		hif_bus_prevent_linkdown(scn, true);
 }
 
 /**

core/hif/src/hif_main.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2015 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2013-2016 The Linux Foundation. All rights reserved.
  *
  * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
  *
@@ -131,6 +131,6 @@ CDF_STATUS hif_bus_open(struct ol_softc *ol_sc,
 CDF_STATUS hif_enable_bus(struct ol_softc *ol_sc, struct device *dev,
 	void *bdev, const hif_bus_id *bid, enum hif_enable_type type);
 void hif_disable_bus(void *bdev);
-void hif_bus_prevent_linkdown(bool flag);
+void hif_bus_prevent_linkdown(struct ol_softc *scn, bool flag);
 
 #endif /* __HIF_MAIN_H__ */

core/hif/src/pcie/if_pci.c

@@ -1068,6 +1068,8 @@ static void hif_pm_runtime_open(struct hif_pci_softc *sc)
 	spin_lock_init(&sc->runtime_lock);
 
 	cdf_atomic_init(&sc->pm_state);
+	sc->prevent_linkdown_lock =
+		hif_runtime_lock_init("linkdown suspend disabled");
 	cdf_atomic_set(&sc->pm_state, HIF_PM_RUNTIME_STATE_NONE);
 	INIT_LIST_HEAD(&sc->prevent_suspend_list);
 }
@@ -1621,6 +1623,30 @@ void hif_disable_bus(void *bdev)
 #define OL_ATH_PCI_PM_CONTROL 0x44
 
 #ifdef CONFIG_CNSS
+
+#ifdef RUNTIME_PM
+/**
+ * hif_runtime_prevent_linkdown() - prevent or allow a runtime pm from occuring
+ * @scn: hif context
+ * @flag: prevent linkdown if true otherwise allow
+ *
+ * this api should only be called as part of bus prevent linkdown
+ */
+static void hif_runtime_prevent_linkdown(struct ol_softc *scn, bool flag)
+{
+	struct hif_pci_softc *sc = scn->hif_sc;
+
+	if (flag)
+		hif_pm_runtime_prevent_suspend(scn, sc->prevent_linkdown_lock);
+	else
+		hif_pm_runtime_allow_suspend(scn, sc->prevent_linkdown_lock);
+}
+#else
+static void hif_runtime_prevent_linkdown(struct ol_softc *scn, bool flag)
+{
+}
+#endif
+
 /**
  * hif_bus_prevent_linkdown(): allow or permit linkdown
  * @flag: true prevents linkdown, false allows
@@ -1630,10 +1656,11 @@ void hif_disable_bus(void *bdev)
  *
  * Return: n/a
  */
-void hif_bus_prevent_linkdown(bool flag)
+void hif_bus_prevent_linkdown(struct ol_softc *scn, bool flag)
 {
 	HIF_ERROR("wlan: %s pcie power collapse",
 			(flag ? "disable" : "enable"));
+	hif_runtime_prevent_linkdown(scn, flag);
 	cnss_wlan_pm_control(flag);
 }
 #endif

core/hif/src/pcie/if_pci.h

@@ -126,6 +126,7 @@ struct hif_pci_softc {
 	struct timer_list runtime_timer;
 	struct list_head prevent_suspend_list;
 	unsigned long runtime_timer_expires;
+	struct hif_pm_runtime_lock *prevent_linkdown_lock;
 #ifdef WLAN_OPEN_SOURCE
 	struct dentry *pm_dentry;
 #endif

core/hif/src/snoc/if_snoc.c

@@ -47,7 +47,7 @@
  * This is duplicated here because CONFIG_CNSS can be defined
  * even though it is not used for the snoc bus.
  */
-void hif_bus_prevent_linkdown(bool flag)
+void hif_bus_prevent_linkdown(struct ol_softc *scn, bool flag)
 {
 	HIF_ERROR("wlan: %s pcie power collapse ignored",
 			(flag ? "disable" : "enable"));