netdev - [PATCH net 2/2] net: renesas: rswitch: Fix GWTSDIE register handling

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Date:   Wed, 15 Mar 2023 16:04:24 +0900
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Phong Hoang <phong.hoang.wz@...esas.com>
Subject: [PATCH net 2/2] 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@...esas.com>
Fixes: 33f5d733b589 ("net: renesas: rswitch: Improve TX timestamp accuracy")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
---
 drivers/net/ethernet/renesas/rswitch.c | 9 +++++++--
 drivers/net/ethernet/renesas/rswitch.h | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index 46d8d9c8fc19..c4f93d24c6a4 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/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)
diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h
index 27d3d38c055f..b3e0411b408e 100644
--- a/drivers/net/ethernet/renesas/rswitch.h
+++ b/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];
-- 
2.25.1