netdev - [PATCH net-next] tsnep: Add link down PHY loopback support

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Message-Id: <20240123200151.60848-1-gerhard@engleder-embedded.com>
Date: Tue, 23 Jan 2024 21:01:51 +0100
From: Gerhard Engleder <gerhard@...leder-embedded.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	Gerhard Engleder <gerhard@...leder-embedded.com>
Subject: [PATCH net-next] tsnep: Add link down PHY loopback support

PHY loopback turns off link state change signalling. Therefore, the
loopback only works if the link is already up before the PHY loopback is
activated.

Ensure that PHY loopback works even if the link is not already up during
activation by calling netif_carrier_on() explicitly.

Signed-off-by: Gerhard Engleder <gerhard@...leder-embedded.com>
---
 drivers/net/ethernet/engleder/tsnep_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index df40c720e7b2..0462834cf6e1 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -229,8 +229,10 @@ static int tsnep_phy_loopback(struct tsnep_adapter *adapter, bool enable)
 	 * would delay a working loopback anyway, let's ensure that loopback
 	 * is working immediately by setting link mode directly
 	 */
-	if (!retval && enable)
+	if (!retval && enable) {
+		netif_carrier_on(adapter->netdev);
 		tsnep_set_link_mode(adapter);
+	}
 
 	return retval;
 }
-- 
2.39.2