mt76x02u: implement beacon_ops

Add implementation of beacon_ops for USB and exit function to
stop the timer if running when device is removed. Still no
actual work on pre tbtt event.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x0/usb.c

@@ -87,14 +87,11 @@ static void mt76x0u_mac_stop(struct mt76x02_dev *dev)
 	cancel_delayed_work_sync(&dev->cal_work);
 	cancel_delayed_work_sync(&dev->mac_work);
 	mt76u_stop_stat_wk(&dev->mt76);
+	mt76x02u_exit_beacon_config(dev);
 
 	if (test_bit(MT76_REMOVED, &dev->mt76.state))
 		return;
 
-	mt76_clear(dev, MT_BEACON_TIME_CFG, MT_BEACON_TIME_CFG_TIMER_EN |
-		   MT_BEACON_TIME_CFG_SYNC_MODE | MT_BEACON_TIME_CFG_TBTT_EN |
-		   MT_BEACON_TIME_CFG_BEACON_TX);
-
 	if (!mt76_poll(dev, MT_USB_DMA_CFG, MT_USB_DMA_CFG_TX_BUSY, 0, 1000))
 		dev_warn(dev->mt76.dev, "TX DMA did not stop\n");
 

drivers/net/wireless/mediatek/mt76/mt76x02_usb.h

@@ -32,4 +32,5 @@ int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
 			      struct mt76_queue_entry *e);
 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev);
+void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev);
 #endif /* __MT76x02_USB_H */

drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c

@@ -151,6 +151,15 @@ static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev)
 	hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
 }
 
+static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev)
+{
+	do {
+		hrtimer_cancel(&dev->pre_tbtt_timer);
+		cancel_work_sync(&dev->pre_tbtt_work);
+		/* Timer can be rearmed by work. */
+	} while (hrtimer_active(&dev->pre_tbtt_timer));
+}
+
 static void mt76x02u_pre_tbtt_work(struct work_struct *work)
 {
 	struct mt76x02_dev *dev =
@@ -173,10 +182,21 @@ static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
 
 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
 {
+	if (en && dev->beacon_mask && !hrtimer_active(&dev->pre_tbtt_timer))
+		mt76x02u_start_pre_tbtt_timer(dev);
+	if (!en)
+		mt76x02u_stop_pre_tbtt_timer(dev);
 }
 
 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en)
 {
+	if (WARN_ON_ONCE(!dev->beacon_int))
+		return;
+
+	if (en)
+		mt76x02u_start_pre_tbtt_timer(dev);
+
+	/* Nothing to do on disable as timer is already stopped */
 }
 
 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
@@ -194,3 +214,16 @@ void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
 	mt76x02_init_beacon_config(dev);
 }
 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);
+
+void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev)
+{
+	if (!test_bit(MT76_REMOVED, &dev->mt76.state))
+		mt76_clear(dev, MT_BEACON_TIME_CFG,
+			   MT_BEACON_TIME_CFG_TIMER_EN |
+			   MT_BEACON_TIME_CFG_SYNC_MODE |
+			   MT_BEACON_TIME_CFG_TBTT_EN |
+			   MT_BEACON_TIME_CFG_BEACON_TX);
+
+	mt76x02u_stop_pre_tbtt_timer(dev);
+}
+EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config);