mt76: mt7663: introduce 802.11 PS support in sta mode

Enable 802.11 power-save support available in mt7663 firmware
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -286,6 +286,7 @@ enum {
 	MT76_REMOVED,
 	MT76_READING_STATS,
 	MT76_STATE_POWER_OFF,
+	MT76_STATE_PS,
 };
 
 struct mt76_hw_cap {

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

@@ -323,6 +323,8 @@ int mt7615_register_ext_phy(struct mt7615_dev *dev)
 	INIT_DELAYED_WORK(&phy->scan_work, mt7615_scan_work);
 	skb_queue_head_init(&phy->scan_event_list);
 
+	INIT_WORK(&dev->phy.ps_work, mt7615_ps_work);
+
 	mt7615_cap_dbdc_enable(dev);
 	mphy = mt76_alloc_phy(&dev->mt76, sizeof(*phy), &mt7615_ops);
 	if (!mphy)
@@ -386,7 +388,9 @@ void mt7615_init_device(struct mt7615_dev *dev)
 	INIT_LIST_HEAD(&dev->sta_poll_list);
 	spin_lock_init(&dev->sta_poll_lock);
 	init_waitqueue_head(&dev->reset_wait);
+
 	INIT_WORK(&dev->reset_work, mt7615_mac_reset_work);
+	INIT_WORK(&dev->phy.ps_work, mt7615_ps_work);
 
 	mt7615_init_wiphy(hw);
 	dev->mphy.sband_2g.sband.ht_cap.cap |= IEEE80211_HT_CAP_LDPC_CODING;

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

@@ -605,8 +605,11 @@ int mt7615_mac_write_txwi(struct mt7615_dev *dev, __le32 *txwi,
 	}
 
 	if (!ieee80211_is_beacon(fc)) {
-		val = MT_TXD5_TX_STATUS_HOST | MT_TXD5_SW_POWER_MGMT |
-		      FIELD_PREP(MT_TXD5_PID, pid);
+		struct ieee80211_hw *hw = mt76_hw(dev);
+
+		val = MT_TXD5_TX_STATUS_HOST | FIELD_PREP(MT_TXD5_PID, pid);
+		if (!ieee80211_hw_check(hw, SUPPORTS_PS))
+			val |= MT_TXD5_SW_POWER_MGMT;
 		txwi[5] = cpu_to_le32(val);
 	} else {
 		txwi[5] = 0;

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

@@ -71,6 +71,7 @@ static void mt7615_stop(struct ieee80211_hw *hw)
 	struct mt7615_phy *phy = mt7615_hw_phy(hw);
 
 	cancel_delayed_work_sync(&phy->mac_work);
+	cancel_work_sync(&phy->ps_work);
 
 	mutex_lock(&dev->mt76.mutex);
 
@@ -362,6 +363,20 @@ static int mt7615_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	return mt7615_mac_wtbl_set_key(dev, wcid, key, cmd);
 }
 
+void mt7615_ps_work(struct work_struct *work)
+{
+	struct mt7615_phy *phy;
+
+	phy = (struct mt7615_phy *)container_of(work, struct mt7615_phy,
+						ps_work);
+
+	mutex_lock(&phy->dev->mt76.mutex);
+	ieee80211_iterate_active_interfaces(phy->mt76->hw,
+					    IEEE80211_IFACE_ITER_RESUME_ALL,
+					    m7615_mcu_set_ps_iter, phy);
+	mutex_unlock(&phy->dev->mt76.mutex);
+}
+
 static int mt7615_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct mt7615_dev *dev = mt7615_hw_dev(hw);
@@ -387,6 +402,14 @@ static int mt7615_config(struct ieee80211_hw *hw, u32 changed)
 		mt76_wr(dev, MT_WF_RFCR(band), phy->rxfilter);
 	}
 
+	if (changed & IEEE80211_CONF_CHANGE_PS) {
+		if (hw->conf.flags & IEEE80211_CONF_PS)
+			set_bit(MT76_STATE_PS, &phy->mt76->state);
+		else
+			clear_bit(MT76_STATE_PS, &phy->mt76->state);
+		ieee80211_queue_work(hw, &phy->ps_work);
+	}
+
 	mutex_unlock(&dev->mt76.mutex);
 
 	return ret;

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

@@ -2586,6 +2586,27 @@ int mt7615_mcu_set_sku_en(struct mt7615_phy *phy, bool enable)
 				   sizeof(req), true);
 }
 
+void m7615_mcu_set_ps_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
+{
+	struct mt7615_vif *mvif = (struct mt7615_vif *)vif->drv_priv;
+	struct mt7615_phy *phy = priv;
+	struct mt76_phy *mphy = phy->mt76;
+	struct {
+		u8 bss_idx;
+		u8 ps_state; /* 0: device awake
+			      * 1: static power save
+			      * 2: dynamic power saving
+			      */
+	} req = {
+		.bss_idx = mvif->idx,
+		.ps_state = test_bit(MT76_STATE_PS, &mphy->state) ? 2 : 0,
+	};
+
+	if (vif->type == NL80211_IFTYPE_STATION)
+		__mt76_mcu_send_msg(&phy->dev->mt76,  MCU_CMD_SET_PS_PROFILE,
+				    &req, sizeof(req), false);
+}
+
 int mt7615_mcu_set_channel_domain(struct mt7615_phy *phy)
 {
 	struct mt76_phy *mphy = phy->mt76;

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

@@ -411,6 +411,7 @@ struct mt7615_mcu_bss_event {
 /* offload mcu commands */
 enum {
 	MCU_CMD_START_HW_SCAN = MCU_CE_PREFIX | 0x03,
+	MCU_CMD_SET_PS_PROFILE = MCU_CE_PREFIX | 0x05,
 	MCU_CMD_SET_CHAN_DOMAIN = MCU_CE_PREFIX | 0x0f,
 	MCU_CMD_CANCEL_HW_SCAN = MCU_CE_PREFIX | 0x1b,
 	MCU_CMD_SCHED_SCAN_ENABLE = MCU_CE_PREFIX | 0x61,

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

@@ -197,6 +197,8 @@ struct mt7615_phy {
 
 	struct sk_buff_head scan_event_list;
 	struct delayed_work scan_work;
+
+	struct work_struct ps_work;
 };
 
 #define mt7615_mcu_add_tx_ba(dev, ...)	(dev)->mcu_ops->add_tx_ba((dev), __VA_ARGS__)
@@ -423,6 +425,7 @@ static inline bool mt7615_firmware_offload(struct mt7615_dev *dev)
 }
 
 void mt7615_scan_work(struct work_struct *work);
+void mt7615_ps_work(struct work_struct *work);
 void mt7615_init_txpower(struct mt7615_dev *dev,
 			 struct ieee80211_supported_band *sband);
 void mt7615_phy_init(struct mt7615_dev *dev);
@@ -508,6 +511,7 @@ int mt7615_mcu_set_radar_th(struct mt7615_dev *dev, int index,
 int mt7615_mcu_set_sku_en(struct mt7615_phy *phy, bool enable);
 int mt7615_mcu_apply_rx_dcoc(struct mt7615_phy *phy);
 int mt7615_mcu_apply_tx_dpd(struct mt7615_phy *phy);
+void m7615_mcu_set_ps_iter(void *priv, u8 *mac, struct ieee80211_vif *vif);
 int mt7615_dfs_init_radar_detector(struct mt7615_phy *phy);
 
 int mt7615_init_debugfs(struct mt7615_dev *dev);

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

@@ -16,6 +16,7 @@ static void mt7615_init_work(struct work_struct *work)
 {
 	struct mt7615_dev *dev = container_of(work, struct mt7615_dev,
 					      mcu_work);
+	struct ieee80211_hw *hw = mt76_hw(dev);
 
 	if (mt7615_mcu_init(dev))
 		return;
@@ -25,8 +26,11 @@ static void mt7615_init_work(struct work_struct *work)
 	mt7615_phy_init(dev);
 	mt7615_mcu_del_wtbl_all(dev);
 
-	if (!mt7615_firmware_offload(dev)) {
-		struct wiphy *wiphy = mt76_hw(dev)->wiphy;
+	if (mt7615_firmware_offload(dev)) {
+		ieee80211_hw_set(hw, SUPPORTS_PS);
+		ieee80211_hw_set(hw, SUPPORTS_DYNAMIC_PS);
+	} else {
+		struct wiphy *wiphy = hw->wiphy;
 
 		dev->ops->hw_scan = NULL;
 		dev->ops->cancel_hw_scan = NULL;

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

@@ -119,6 +119,9 @@ int mt7663u_register_device(struct mt7615_dev *dev)
 	if (err)
 		return err;
 
+	ieee80211_hw_set(hw, SUPPORTS_PS);
+	ieee80211_hw_set(hw, SUPPORTS_DYNAMIC_PS);
+
 	hw->extra_tx_headroom += MT_USB_HDR_SIZE + MT_USB_TXD_SIZE;
 	/* check hw sg support in order to enable AMSDU */
 	hw->max_tx_fragments = dev->mt76.usb.sg_en ? MT_HW_TXP_MAX_BUF_NUM : 1;