mt76: mt7615: introduce pm_power_save delayed work

Introduce runtime-pm power_save delayed work used to enable
low-power after an inactivity period
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/init.c

@@ -436,6 +436,7 @@ void mt7615_init_device(struct mt7615_dev *dev)
 	dev->phy.mt76 = &dev->mt76.phy;
 	dev->mt76.phy.priv = &dev->phy;
 
+	INIT_DELAYED_WORK(&dev->pm.ps_work, mt7615_pm_power_save_work);
 	INIT_WORK(&dev->pm.wake_work, mt7615_pm_wake_work);
 	init_completion(&dev->pm.wake_cmpl);
 	INIT_DELAYED_WORK(&dev->phy.mac_work, mt7615_mac_work);

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -1850,6 +1850,34 @@ int mt7615_pm_wake(struct mt7615_dev *dev)
 }
 EXPORT_SYMBOL_GPL(mt7615_pm_wake);
 
+void mt7615_pm_power_save_sched(struct mt7615_dev *dev)
+{
+	struct mt76_phy *mphy = dev->phy.mt76;
+
+	if (!mt7615_firmware_offload(dev) ||
+	    !dev->pm.enable || !mt76_is_mmio(mphy->dev) ||
+	    !test_bit(MT76_STATE_RUNNING, &mphy->state))
+		return;
+
+	dev->pm.last_activity = jiffies;
+	if (!test_bit(MT76_STATE_PM, &mphy->state))
+		queue_delayed_work(dev->mt76.wq, &dev->pm.ps_work,
+				   MT7615_PM_TIMEOUT);
+}
+EXPORT_SYMBOL_GPL(mt7615_pm_power_save_sched);
+
+void mt7615_pm_power_save_work(struct work_struct *work)
+{
+	struct mt7615_dev *dev;
+
+	dev = (struct mt7615_dev *)container_of(work, struct mt7615_dev,
+						pm.ps_work.work);
+
+	if (mt7615_firmware_own(dev))
+		queue_delayed_work(dev->mt76.wq, &dev->pm.ps_work,
+				   MT7615_PM_TIMEOUT);
+}
+
 void mt7615_mac_work(struct work_struct *work)
 {
 	struct mt7615_phy *phy;

drivers/net/wireless/mediatek/mt76/mt7615/main.c

@@ -74,6 +74,7 @@ static void mt7615_stop(struct ieee80211_hw *hw)
 	del_timer_sync(&phy->roc_timer);
 	cancel_work_sync(&phy->roc_work);
 
+	cancel_delayed_work_sync(&dev->pm.ps_work);
 	cancel_work_sync(&dev->pm.wake_work);
 
 	mt7615_mutex_acquire(dev);
@@ -1003,6 +1004,8 @@ static int mt7615_suspend(struct ieee80211_hw *hw,
 	bool ext_phy = phy != &dev->phy;
 	int err = 0;
 
+	cancel_delayed_work_sync(&dev->pm.ps_work);
+
 	mt7615_mutex_acquire(dev);
 
 	clear_bit(MT76_STATE_RUNNING, &phy->mt76->state);

drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h

@@ -19,6 +19,7 @@
 #define MT7615_WTBL_STA			(MT7615_WTBL_RESERVED - \
 					 MT7615_MAX_INTERFACES)
 
+#define MT7615_PM_TIMEOUT		(HZ / 12)
 #define MT7615_WATCHDOG_TIME		(HZ / 10)
 #define MT7615_HW_SCAN_TIMEOUT		(HZ / 10)
 #define MT7615_RESET_TIMEOUT		(30 * HZ)
@@ -299,9 +300,12 @@ struct mt7615_dev {
 #endif
 
 	struct {
+		bool enable;
+
 		struct work_struct wake_work;
 		struct completion wake_cmpl;
 
+		struct delayed_work ps_work;
 		unsigned long last_activity;
 	} pm;
 };
@@ -435,6 +439,8 @@ void mt7615_mac_set_rates(struct mt7615_phy *phy, struct mt7615_sta *sta,
 			  struct ieee80211_tx_rate *rates);
 void mt7615_pm_wake_work(struct work_struct *work);
 int mt7615_pm_wake(struct mt7615_dev *dev);
+void mt7615_pm_power_save_sched(struct mt7615_dev *dev);
+void mt7615_pm_power_save_work(struct work_struct *work);
 int mt7615_mcu_del_wtbl_all(struct mt7615_dev *dev);
 int mt7615_mcu_set_chan_info(struct mt7615_phy *phy, int cmd);
 int mt7615_mcu_set_wmm(struct mt7615_dev *dev, u8 queue,
@@ -499,7 +505,7 @@ static inline void mt7615_mutex_acquire(struct mt7615_dev *dev)
 static inline void mt7615_mutex_release(struct mt7615_dev *dev)
 	__releases(&dev->mt76.mutex)
 {
-	dev->pm.last_activity = jiffies;
+	mt7615_pm_power_save_sched(dev);
 	mutex_unlock(&dev->mt76.mutex);
 }