ath10k: add HTC TX credits replenishing notification

This will allow higher layers to anticipate and
act upon TX credits renewal. This will be
important for some future rework of WMI command
submission.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath10k/htc.c

@@ -150,6 +150,9 @@ err:
 	ep->tx_credits += credits;
 	spin_unlock_bh(&htc->tx_lock);
 
+	if (ep->ep_ops.ep_tx_credits)
+		ep->ep_ops.ep_tx_credits(htc->ar);
+
 	/* this is the simplest way to handle out-of-resources for non-credit
 	 * based endpoints. credit based endpoints can still get -ENOSR, but
 	 * this is highly unlikely as credit reservation should prevent that */
@@ -302,6 +305,12 @@ ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 		ep = &htc->endpoint[report->eid];
 		ep->tx_credits += report->credits;
 
+		if (ep->ep_ops.ep_tx_credits) {
+			spin_unlock_bh(&htc->tx_lock);
+			ep->ep_ops.ep_tx_credits(htc->ar);
+			spin_lock_bh(&htc->tx_lock);
+		}
+
 		if (ep->tx_credits && !skb_queue_empty(&ep->tx_queue))
 			queue_work(htc->ar->workqueue, &ep->send_work);
 	}

drivers/net/wireless/ath/ath10k/htc.h

@@ -276,6 +276,7 @@ struct ath10k_htc_ops {
 struct ath10k_htc_ep_ops {
 	void (*ep_tx_complete)(struct ath10k *, struct sk_buff *);
 	void (*ep_rx_complete)(struct ath10k *, struct sk_buff *);
+	void (*ep_tx_credits)(struct ath10k *);
 };
 
 /* service connection information */