mt76: introduce mcu_reset function pointer in mt76_mcu_ops structure

Introduce mcu_reset function pointer in mt76_mcu_ops structure in order
to run hw related reset function for the mcu running on the chipset.
This is a preliminary patch to introduce chip reset for mt7921 devices.

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/mcu.c

@@ -99,6 +99,10 @@ int mt76_mcu_skb_send_and_get_msg(struct mt76_dev *dev, struct sk_buff *skb,
 			dev_kfree_skb(skb);
 	} while (ret == -EAGAIN);
 
+	/* notify driver code to reset the mcu */
+	if (ret == -ETIMEDOUT && dev->mcu_ops->mcu_reset)
+		dev->mcu_ops->mcu_reset(dev);
+
 out:
 	mutex_unlock(&dev->mcu.mutex);
 

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

@@ -166,6 +166,7 @@ struct mt76_mcu_ops {
 	int (*mcu_rd_rp)(struct mt76_dev *dev, u32 base,
 			 struct mt76_reg_pair *rp, int len);
 	int (*mcu_restart)(struct mt76_dev *dev);
+	void (*mcu_reset)(struct mt76_dev *dev);
 };
 
 struct mt76_queue_ops {