qcacld-3.0: Idle shutdown in suspend prepare

To support shutdown WLAN when system goes into suspend, add idle shutdown
when got PM_SUSPEND_PREPARE/PM_HIBERNATION_PREPARE.

Before suspend/shutdown, user space should stop adapter. And after resume,
user space should restart adapter. This can ensure user and kernel space
to sync adapter's state.

Change-Id: Id1f5172a7fc1792c83c8c1c20127de815f7e4980
CRs-Fixed: 3208931

components/pmo/dispatcher/inc/wlan_pmo_common_cfg.h

@@ -340,13 +340,14 @@
  * <ini>
  * gSuspendMode - Suspend mode configuration
  * @Min: 0
- * @Max: 2
+ * @Max: 3
  * @Default: 2
  *
  * This ini is used to set suspend mode. Configurations are as follows:
  * 0 - Does not support suspend.
  * 1 - Legency suspend mode, PDEV suspend.
  * 2 - WOW suspend mode.
+ * 3 - Shutdown wlan while suspend.
  *
  * Related: None
  *
@@ -357,7 +358,7 @@
  * </ini>
  */
 #define CFG_PMO_SUSPEND_MODE CFG_INI_UINT("gSuspendMode", \
-					  0, 2, 2, \
+					  0, 3, 2, \
 					  CFG_VALUE_OR_DEFAULT, \
 					  "Suspend mode")
 

components/pmo/dispatcher/inc/wlan_pmo_common_public_struct.h

@@ -175,11 +175,13 @@ enum powersave_mode {
  * @PMO_SUSPEND_NONE: Does not support suspend
  * @PMO_SUSPEND_LEGENCY: Legency PDEV suspend mode
  * @PMO_SUSPEND_WOW: WoW suspend mode
+ * @PMO_SUSPEND_SHUTDOWN: Shutdown suspend mode. Shutdown while suspend
  */
 enum pmo_suspend_mode {
 	PMO_SUSPEND_NONE = 0,
 	PMO_SUSPEND_LEGENCY,
-	PMO_SUSPEND_WOW
+	PMO_SUSPEND_WOW,
+	PMO_SUSPEND_SHUTDOWN
 };
 
 #define PMO_TARGET_SUSPEND_TIMEOUT   (4000)

core/hdd/inc/wlan_hdd_main.h

@@ -2253,6 +2253,7 @@ struct hdd_context {
 	/* Present state of driver cds modules */
 	enum driver_modules_status driver_status;
 	struct qdf_delayed_work psoc_idle_timeout_work;
+	struct notifier_block pm_notifier;
 	bool rps;
 	bool dynamic_rps;
 	bool enable_rxthread;

core/hdd/src/wlan_hdd_main.c

@@ -84,6 +84,7 @@
 #include <linux/ctype.h>
 #include <linux/compat.h>
 #include <linux/ethtool.h>
+#include <linux/suspend.h>
 
 #ifdef WLAN_FEATURE_DP_BUS_BANDWIDTH
 #include "qdf_periodic_work.h"
@@ -9821,6 +9822,7 @@ void hdd_context_destroy(struct hdd_context *hdd_ctx)
 	hdd_ctx->config = NULL;
 	cfg_release();
 
+	unregister_pm_notifier(&hdd_ctx->pm_notifier);
 	qdf_delayed_work_destroy(&hdd_ctx->psoc_idle_timeout_work);
 	wiphy_free(hdd_ctx->wiphy);
 }
@@ -13618,6 +13620,58 @@ static inline QDF_STATUS hdd_cfg_parse_connection_roaming_cfg(void)
 }
 #endif
 
+static QDF_STATUS hdd_shutdown_wlan_in_suspend_prepare(void)
+{
+#define SHUTDOWN_IN_SUSPEND_RETRY 10
+
+	int count = 0;
+	struct hdd_context *hdd_ctx;
+
+	hdd_ctx = cds_get_context(QDF_MODULE_ID_HDD);
+	if (wlan_hdd_validate_context(hdd_ctx) != 0)
+		return -EINVAL;
+
+	if (ucfg_pmo_get_suspend_mode(hdd_ctx->psoc) != PMO_SUSPEND_SHUTDOWN) {
+		hdd_info("shutdown in suspend not supported");
+		return 0;
+	}
+
+	while (hdd_is_any_interface_open(hdd_ctx) &&
+	       count < SHUTDOWN_IN_SUSPEND_RETRY) {
+		count++;
+		hdd_info_rl("sleep 50ms to wait apdaters stopped, #%d", count);
+		msleep(50);
+	}
+	if (count >= SHUTDOWN_IN_SUSPEND_RETRY) {
+		hdd_err("some adapters not stopped");
+		return -EBUSY;
+	}
+
+	qdf_delayed_work_stop_sync(&hdd_ctx->psoc_idle_timeout_work);
+
+	hdd_debug("call pld idle shutdown directly");
+	return pld_idle_shutdown(hdd_ctx->parent_dev, hdd_psoc_idle_shutdown);
+}
+
+static int hdd_pm_notify(struct notifier_block *b,
+			 unsigned long event, void *p)
+{
+	hdd_info("got PM event: %lu", event);
+
+	switch (event) {
+	case PM_SUSPEND_PREPARE:
+	case PM_HIBERNATION_PREPARE:
+		if (0 != hdd_shutdown_wlan_in_suspend_prepare())
+			return NOTIFY_STOP;
+		break;
+	case PM_POST_SUSPEND:
+	case PM_POST_HIBERNATION:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
 struct hdd_context *hdd_context_create(struct device *dev)
 {
 	QDF_STATUS status;
@@ -13640,6 +13694,9 @@ struct hdd_context *hdd_context_create(struct device *dev)
 		goto wiphy_dealloc;
 	}
 
+	hdd_ctx->pm_notifier.notifier_call = hdd_pm_notify;
+	register_pm_notifier(&hdd_ctx->pm_notifier);
+
 	hdd_ctx->parent_dev = dev;
 	hdd_ctx->last_scan_reject_vdev_id = WLAN_UMAC_VDEV_ID_MAX;