net: renesas: rswitch: Fix GWTSDIE register handling

Since the GWCA has the TX timestamp feature, this driver
should not disable it if one of ports is opened. So, fix it.

Reported-by: Phong Hoang <phong.hoang.wz@renesas.com>
Fixes: 33f5d73 ("net: renesas: rswitch: Improve TX timestamp accuracy")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: shimoday

drivers/net/ethernet/renesas/rswitch.c

@@ -1441,7 +1441,10 @@ static int rswitch_open(struct net_device *ndev)
 	rswitch_enadis_data_irq(rdev->priv, rdev->tx_queue->index, true);
 	rswitch_enadis_data_irq(rdev->priv, rdev->rx_queue->index, true);
 
-	iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDIE);
+	if (bitmap_empty(rdev->priv->opened_ports, RSWITCH_NUM_PORTS))
+		iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDIE);
+
+	bitmap_set(rdev->priv->opened_ports, rdev->port, 1);
 
 	return 0;
 };
@@ -1452,8 +1455,10 @@ static int rswitch_stop(struct net_device *ndev)
 	struct rswitch_gwca_ts_info *ts_info, *ts_info2;
 
 	netif_tx_stop_all_queues(ndev);
+	bitmap_clear(rdev->priv->opened_ports, rdev->port, 1);
 
-	iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDID);
+	if (bitmap_empty(rdev->priv->opened_ports, RSWITCH_NUM_PORTS))
+		iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDID);
 
 	list_for_each_entry_safe(ts_info, ts_info2, &rdev->priv->gwca.ts_info_list, list) {
 		if (ts_info->port != rdev->port)

drivers/net/ethernet/renesas/rswitch.h

@@ -998,6 +998,7 @@ struct rswitch_private {
 	struct rcar_gen4_ptp_private *ptp_priv;
 
 	struct rswitch_device *rdev[RSWITCH_NUM_PORTS];
+	DECLARE_BITMAP(opened_ports, RSWITCH_NUM_PORTS);
 
 	struct rswitch_gwca gwca;
 	struct rswitch_etha etha[RSWITCH_NUM_PORTS];