wl12xx: enter/exit psm on wowlan suspend/resume

When operating as station, enter psm before suspending
the device into wowlan state.

Add a new completion event to signal when psm was entered
successfully.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/event.c

@@ -135,6 +135,13 @@ static int wl1271_event_ps_report(struct wl1271 *wl,
 
 		/* enable beacon early termination */
 		ret = wl1271_acx_bet_enable(wl, true);
+		if (ret < 0)
+			break;
+
+		if (wl->ps_compl) {
+			complete(wl->ps_compl);
+			wl->ps_compl = NULL;
+		}
 		break;
 	default:
 		break;

drivers/net/wireless/wl12xx/main.c

@@ -1350,13 +1350,92 @@ static struct notifier_block wl1271_dev_notifier = {
 	.notifier_call = wl1271_dev_notify,
 };
 
+static int wl1271_configure_suspend(struct wl1271 *wl)
+{
+	int ret;
+
+	if (wl->bss_type != BSS_TYPE_STA_BSS)
+		return 0;
+
+	mutex_lock(&wl->mutex);
+
+	ret = wl1271_ps_elp_wakeup(wl);
+	if (ret < 0)
+		goto out_unlock;
+
+	/* enter psm if needed*/
+	if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
+		DECLARE_COMPLETION_ONSTACK(compl);
+
+		wl->ps_compl = &compl;
+		ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
+				   wl->basic_rate, true);
+		if (ret < 0)
+			goto out_sleep;
+
+		/* we must unlock here so we will be able to get events */
+		wl1271_ps_elp_sleep(wl);
+		mutex_unlock(&wl->mutex);
+
+		ret = wait_for_completion_timeout(
+			&compl, msecs_to_jiffies(WL1271_PS_COMPLETE_TIMEOUT));
+		if (ret <= 0) {
+			wl1271_warning("couldn't enter ps mode!");
+			ret = -EBUSY;
+			goto out;
+		}
+
+		/* take mutex again, and wakeup */
+		mutex_lock(&wl->mutex);
+
+		ret = wl1271_ps_elp_wakeup(wl);
+		if (ret < 0)
+			goto out_unlock;
+	}
+out_sleep:
+	wl1271_ps_elp_sleep(wl);
+out_unlock:
+	mutex_unlock(&wl->mutex);
+out:
+	return ret;
+
+}
+
+static void wl1271_configure_resume(struct wl1271 *wl)
+{
+	int ret;
+
+	if (wl->bss_type != BSS_TYPE_STA_BSS)
+		return;
+
+	mutex_lock(&wl->mutex);
+	ret = wl1271_ps_elp_wakeup(wl);
+	if (ret < 0)
+		goto out;
+
+	/* exit psm if it wasn't configured */
+	if (!test_bit(WL1271_FLAG_PSM_REQUESTED, &wl->flags))
+		wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
+				   wl->basic_rate, true);
+
+	wl1271_ps_elp_sleep(wl);
+out:
+	mutex_unlock(&wl->mutex);
+}
+
 static int wl1271_op_suspend(struct ieee80211_hw *hw,
 			    struct cfg80211_wowlan *wow)
 {
 	struct wl1271 *wl = hw->priv;
 	wl1271_debug(DEBUG_MAC80211, "mac80211 suspend wow=%d", !!wow);
 	wl->wow_enabled = !!wow;
 	if (wl->wow_enabled) {
+		int ret;
+		ret = wl1271_configure_suspend(wl);
+		if (ret < 0) {
+			wl1271_warning("couldn't prepare device to suspend");
+			return ret;
+		}
 		/* flush any remaining work */
 		wl1271_debug(DEBUG_MAC80211, "flushing remaining works");
 		flush_delayed_work(&wl->scan_complete_work);
@@ -1408,6 +1487,8 @@ static int wl1271_op_resume(struct ieee80211_hw *hw)
 			wl1271_irq(0, wl);
 			wl1271_enable_interrupts(wl);
 		}
+
+		wl1271_configure_resume(wl);
 	}
 
 	return 0;

drivers/net/wireless/wl12xx/ps.h

@@ -35,4 +35,6 @@ void wl1271_elp_work(struct work_struct *work);
 void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues);
 void wl1271_ps_link_end(struct wl1271 *wl, u8 hlid);
 
+#define WL1271_PS_COMPLETE_TIMEOUT 500
+
 #endif /* __WL1271_PS_H__ */

drivers/net/wireless/wl12xx/wl12xx.h

@@ -513,6 +513,7 @@ struct wl1271 {
 	unsigned int rx_filter;
 
 	struct completion *elp_compl;
+	struct completion *ps_compl;
 	struct delayed_work elp_work;
 	struct delayed_work pspoll_work;