mt76: mt7921: add MCU support

MT7921 contains a microprocessor with which the host can use command/event
to communicate to implement offload features such as establish connection,
hardware scan and so on. The host has to download the ROM patch, RAM
firmware and finally activate the MCU to complete the MT7921
initialization.

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Co-developed-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -1338,6 +1338,30 @@ mt7921_mac_update_mib_stats(struct mt7921_phy *phy)
 	}
 }
 
+static void
+mt7921_mac_sta_stats_work(struct mt7921_phy *phy)
+{
+	struct mt7921_dev *dev = phy->dev;
+	struct mt7921_sta *msta;
+	LIST_HEAD(list);
+
+	spin_lock_bh(&dev->sta_poll_lock);
+	list_splice_init(&phy->stats_list, &list);
+
+	while (!list_empty(&list)) {
+		msta = list_first_entry(&list, struct mt7921_sta, stats_list);
+		list_del_init(&msta->stats_list);
+		spin_unlock_bh(&dev->sta_poll_lock);
+
+		/* query wtbl info to report tx rate for further devices */
+		mt7921_get_wtbl_info(dev, msta->wcid.idx);
+
+		spin_lock_bh(&dev->sta_poll_lock);
+	}
+
+	spin_unlock_bh(&dev->sta_poll_lock);
+}
+
 void mt7921_mac_work(struct work_struct *work)
 {
 	struct mt7921_phy *phy;
@@ -1355,6 +1379,10 @@ void mt7921_mac_work(struct work_struct *work)
 
 		mt7921_mac_update_mib_stats(phy);
 	}
+	if (++phy->sta_work_count == 10) {
+		phy->sta_work_count = 0;
+		mt7921_mac_sta_stats_work(phy);
+	};
 
 	mutex_unlock(&mphy->dev->mutex);