linux-kernel - [PATCH net v1 2/2] net: phy: microchip: lan87xx: do not report SQI if no link

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Message-Id: <20240703132801.623218-2-o.rempel@pengutronix.de>
Date: Wed,  3 Jul 2024 15:28:01 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Yuiko Oshino <yuiko.oshino@...rochip.com>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com
Subject: [PATCH net v1 2/2] net: phy: microchip: lan87xx: do not report SQI if no link

Do not report SQI if no link is detected. Otherwise ethtool will show
non zero value even if no cable is attached.

Fixes: b649695248b15 ("net: phy: LAN87xx: add ethtool SQI support")
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/phy/microchip_t1.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/microchip_t1.c b/drivers/net/phy/microchip_t1.c
index a35528497a576..22530a5b76365 100644
--- a/drivers/net/phy/microchip_t1.c
+++ b/drivers/net/phy/microchip_t1.c
@@ -840,6 +840,9 @@ static int lan87xx_get_sqi(struct phy_device *phydev)
 	u8 sqi_value = 0;
 	int rc;
 
+	if (!phydev->link)
+		return 0;
+
 	rc = access_ereg(phydev, PHYACC_ATTR_MODE_WRITE,
 			 PHYACC_ATTR_BANK_DSP, T1_COEF_RW_CTL_CFG, 0x0301);
 	if (rc < 0)
-- 
2.39.2