netdev - [PATCH] net: phy: realtek: Fix setting of PHY LEDs Mode B bit on RTL8211F

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Message-ID:
 <PAWP192MB21287372F30C4E55B6DF6158C38E2@PAWP192MB2128.EURP192.PROD.OUTLOOK.COM>
Date: Wed, 21 Aug 2024 04:16:57 +0200
From: Sava Jakovljev <sjakovljev@...look.com>
To:
Cc: savaj@...ersound.com,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Marek Vasut <marex@...x.de>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] net: phy: realtek: Fix setting of PHY LEDs Mode B bit on RTL8211F

From: Sava Jakovljev <savaj@...ersound.com>

The current implementation incorrectly sets the mode bit of the PHY chip.
Bit 15 (RTL8211F_LEDCR_MODE) should not be shifted together with the
configuration nibble of a LED- it should be set independently of the
index of the LED being configured.
As a consequence, the RTL8211F LED control is actually operating in Mode A.
Fix the error by or-ing final register value to write with a const-value of
RTL8211F_LEDCR_MODE, thus setting Mode bit explicitly.

Fixes: 17784801d888 ("net: phy: realtek: Add support for PHY LEDs on RTL8211F")

Signed-off-by: Sava Jakovljev <savaj@...ersound.com>
---
 drivers/net/phy/realtek.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 87865918dab6..25e5bfbb6f89 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -555,7 +555,7 @@ static int rtl8211f_led_hw_control_set(struct phy_device *phydev, u8 index,
 				       unsigned long rules)
 {
 	const u16 mask = RTL8211F_LEDCR_MASK << (RTL8211F_LEDCR_SHIFT * index);
-	u16 reg = RTL8211F_LEDCR_MODE;	/* Mode B */
+	u16 reg = 0;
 
 	if (index >= RTL8211F_LED_COUNT)
 		return -EINVAL;
@@ -575,6 +575,7 @@ static int rtl8211f_led_hw_control_set(struct phy_device *phydev, u8 index,
 	}
 
 	reg <<= RTL8211F_LEDCR_SHIFT * index;
+	reg |= RTL8211F_LEDCR_MODE;	 /* Mode B */
 
 	return phy_modify_paged(phydev, 0xd04, RTL8211F_LEDCR, mask, reg);
 }
-- 
2.46.0