mt76x02u: add mt76_release_buffered_frames

Create software MT_TXQ_PSD queue for USB and map it to MT_TXQ_VO
since we do not have USB endpoint for PSD. This should make
mt76_release_buffered_frames() work by sending released frames
via MT_TXQ_VO.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -152,6 +152,7 @@ static const struct ieee80211_ops mt76x0u_ops = {
 	.set_rts_threshold = mt76x02_set_rts_threshold,
 	.wake_tx_queue = mt76_wake_tx_queue,
 	.get_txpower = mt76_get_txpower,
+	.release_buffered_frames = mt76_release_buffered_frames,
 };
 
 static int mt76x0u_init_hardware(struct mt76x02_dev *dev)

drivers/net/wireless/mediatek/mt76/mt76x2/usb_main.c

@@ -129,4 +129,5 @@ const struct ieee80211_ops mt76x2u_ops = {
 	.sw_scan_complete = mt76x02_sw_scan_complete,
 	.sta_rate_tbl_update = mt76x02_sta_rate_tbl_update,
 	.get_txpower = mt76_get_txpower,
+	.release_buffered_frames = mt76_release_buffered_frames,
 };

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

@@ -792,9 +792,14 @@ static int mt76u_alloc_tx(struct mt76_dev *dev)
 	struct mt76_queue *q;
 	int i, j;
 
-	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+	for (i = 0; i <= MT_TXQ_PSD; i++) {
 		INIT_LIST_HEAD(&dev->q_tx[i].swq);
 
+		if (i >= IEEE80211_NUM_ACS) {
+			dev->q_tx[i].q = dev->q_tx[0].q;
+			continue;
+		}
+
 		q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL);
 		if (!q)
 			return -ENOMEM;