linux-kernel - [PATCH] net: phy: Fix mask value write on gmii2rgmii converter speed register.

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Message-Id: <1505373391-18697-1-git-send-email-fahad.kunnathadi@dexceldesigns.com>
Date:   Thu, 14 Sep 2017 12:46:31 +0530
From:   Fahad Kunnathadi <fahad.kunnathadi@...celdesigns.com>
To:     f.fainelli@...il.com
Cc:     michal.simek@...inx.com, soren.brinkmann@...inx.com,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Fahad Kunnathadi <fahad.kunnathadi@...celdesigns.com>
Subject: [PATCH] net: phy: Fix mask value write on gmii2rgmii converter speed register.

To clear Speed Selection in MDIO control register(0x10),
ie, clear bits 6 and 13 to zero while keeping other bits same.
Before AND operation,The Mask value has to be perform with bitwise NOT
operation (ie, ~ operator)

This patch clears current speed selection before writing the
new speed settings to gmii2rgmii converter

Signed-off-by: Fahad Kunnathadi <fahad.kunnathadi@...celdesigns.com>
---
 drivers/net/phy/xilinx_gmii2rgmii.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
index d15dd39..2e5150b 100644
--- a/drivers/net/phy/xilinx_gmii2rgmii.c
+++ b/drivers/net/phy/xilinx_gmii2rgmii.c
@@ -44,7 +44,7 @@ static int xgmiitorgmii_read_status(struct phy_device *phydev)
 	priv->phy_drv->read_status(phydev);
 
 	val = mdiobus_read(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG);
-	val &= XILINX_GMII2RGMII_SPEED_MASK;
+	val &= ~XILINX_GMII2RGMII_SPEED_MASK;
 
 	if (phydev->speed == SPEED_1000)
 		val |= BMCR_SPEED1000;
-- 
1.9.1