mt76: add MT_RXQ_MAIN_WA for mt7916

mt7916 add MT_RXQ_MAIN_WA to receive tx free event separately
This is an intermediate patch to add mt7916 support.
Co-developed-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Bo Jiao <Bo.Jiao@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -93,7 +93,7 @@ mt76_dma_queue_reset(struct mt76_dev *dev, struct mt76_queue *q)
 {
 	int i;
 
-	if (!q)
+	if (!q || !q->ndesc)
 		return;
 
 	/* clear descriptors */
@@ -233,7 +233,7 @@ mt76_dma_tx_cleanup(struct mt76_dev *dev, struct mt76_queue *q, bool flush)
 	struct mt76_queue_entry entry;
 	int last;
 
-	if (!q)
+	if (!q || !q->ndesc)
 		return;
 
 	spin_lock_bh(&q->cleanup_lock);
@@ -448,6 +448,9 @@ mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q)
 	int len = SKB_WITH_OVERHEAD(q->buf_size);
 	int offset = q->buf_offset;
 
+	if (!q->ndesc)
+		return 0;
+
 	spin_lock_bh(&q->lock);
 
 	while (q->queued < q->ndesc - 1) {
@@ -484,6 +487,9 @@ mt76_dma_rx_cleanup(struct mt76_dev *dev, struct mt76_queue *q)
 	void *buf;
 	bool more;
 
+	if (!q->ndesc)
+		return;
+
 	spin_lock_bh(&q->lock);
 	do {
 		buf = mt76_dma_dequeue(dev, q, true, NULL, NULL, &more);
@@ -508,6 +514,9 @@ mt76_dma_rx_reset(struct mt76_dev *dev, enum mt76_rxq_id qid)
 	struct mt76_queue *q = &dev->q_rx[qid];
 	int i;
 
+	if (!q->ndesc)
+		return;
+
 	for (i = 0; i < q->ndesc; i++)
 		q->desc[i].ctrl = cpu_to_le32(MT_DMA_CTL_DMA_DONE);
 

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

@@ -85,6 +85,7 @@ enum mt76_rxq_id {
 	MT_RXQ_MCU_WA,
 	MT_RXQ_EXT,
 	MT_RXQ_EXT_WA,
+	MT_RXQ_MAIN_WA,
 	__MT_RXQ_MAX
 };