mt76: mt7921: introduce dedicated control for deep_sleep

Introduce ds_enable switch to fully control fw deep_sleep capability
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac.h

@@ -46,6 +46,7 @@ enum {
 
 struct mt76_connac_pm {
 	bool enable;
+	bool ds_enable;
 	bool suspended;
 
 	spinlock_t txq_lock;

drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c

@@ -251,7 +251,7 @@ mt7921_pm_set(void *data, u64 val)
 					    IEEE80211_IFACE_ITER_RESUME_ALL,
 					    mt7921_pm_interface_iter, mphy->priv);
 
-	mt76_connac_mcu_set_deep_sleep(&dev->mt76, !!pm->enable);
+	mt76_connac_mcu_set_deep_sleep(&dev->mt76, pm->ds_enable);
 
 	mt7921_mutex_release(dev);
 
@@ -274,15 +274,31 @@ static int
 mt7921_deep_sleep_set(void *data, u64 val)
 {
 	struct mt7921_dev *dev = data;
+	struct mt76_connac_pm *pm = &dev->pm;
+	bool enable = !!val;
 
 	mt7921_mutex_acquire(dev);
-	mt76_connac_mcu_set_deep_sleep(&dev->mt76, !!val);
+	if (pm->ds_enable != enable) {
+		mt76_connac_mcu_set_deep_sleep(&dev->mt76, enable);
+		pm->ds_enable = enable;
+	}
 	mt7921_mutex_release(dev);
 
 	return 0;
 }
 
-DEFINE_DEBUGFS_ATTRIBUTE(fops_ds, NULL, mt7921_deep_sleep_set, "%lld\n");
+static int
+mt7921_deep_sleep_get(void *data, u64 *val)
+{
+	struct mt7921_dev *dev = data;
+
+	*val = dev->pm.ds_enable;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_ds, mt7921_deep_sleep_get,
+			 mt7921_deep_sleep_set, "%lld\n");
 
 static int
 mt7921_pm_stats(struct seq_file *s, void *data)

drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -201,6 +201,7 @@ int mt7921_register_device(struct mt7921_dev *dev)
 	dev->pm.stats.last_wake_event = jiffies;
 	dev->pm.stats.last_doze_event = jiffies;
 	dev->pm.enable = true;
+	dev->pm.ds_enable = true;
 
 	ret = mt7921_init_hardware(dev);
 	if (ret)
@@ -235,7 +236,7 @@ int mt7921_register_device(struct mt7921_dev *dev)
 	if (ret)
 		return ret;
 
-	return mt76_connac_mcu_set_deep_sleep(&dev->mt76, dev->pm.enable);
+	return mt76_connac_mcu_set_deep_sleep(&dev->mt76, dev->pm.ds_enable);
 }
 
 void mt7921_unregister_device(struct mt7921_dev *dev)

drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -820,7 +820,7 @@ static int mt7921_sta_state(struct ieee80211_hw *hw,
 {
 	struct mt7921_dev *dev = mt7921_hw_dev(hw);
 
-	if (dev->pm.enable) {
+	if (dev->pm.ds_enable) {
 		mt7921_mutex_acquire(dev);
 		mt76_connac_sta_state_dp(&dev->mt76, old_state, new_state);
 		mt7921_mutex_release(dev);

drivers/net/wireless/mediatek/mt76/mt7921/pci.c

@@ -208,8 +208,10 @@ static int mt7921_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 			goto restore_suspend;
 	}
 
-	if (!pm->enable)
-		mt76_connac_mcu_set_deep_sleep(&dev->mt76, true);
+	/* always enable deep sleep during suspend to reduce
+	 * power consumption
+	 */
+	mt76_connac_mcu_set_deep_sleep(&dev->mt76, true);
 
 	napi_disable(&mdev->tx_napi);
 	mt76_worker_disable(&mdev->tx_worker);
@@ -252,7 +254,7 @@ static int mt7921_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	}
 	napi_enable(&mdev->tx_napi);
 
-	if (!pm->enable)
+	if (!pm->ds_enable)
 		mt76_connac_mcu_set_deep_sleep(&dev->mt76, false);
 
 	if (hif_suspend)
@@ -268,9 +270,10 @@ static int mt7921_pci_resume(struct pci_dev *pdev)
 {
 	struct mt76_dev *mdev = pci_get_drvdata(pdev);
 	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
+	struct mt76_connac_pm *pm = &dev->pm;
 	int i, err;
 
-	dev->pm.suspended = false;
+	pm->suspended = false;
 	err = pci_set_power_state(pdev, PCI_D0);
 	if (err)
 		return err;
@@ -301,7 +304,8 @@ static int mt7921_pci_resume(struct pci_dev *pdev)
 	napi_enable(&mdev->tx_napi);
 	napi_schedule(&mdev->tx_napi);
 
-	if (!dev->pm.enable)
+	/* restore previous ds setting */
+	if (!pm->ds_enable)
 		mt76_connac_mcu_set_deep_sleep(&dev->mt76, false);
 
 	if (!test_bit(MT76_STATE_SUSPEND, &dev->mphy.state))