netdev - [PATCH] net: phy: realtek: fix RTL8211F interrupt mode

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Date:   Sun, 12 Nov 2017 16:16:04 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Shengzhou Liu <Shengzhou.Liu@...escale.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: [PATCH] net: phy: realtek: fix RTL8211F interrupt mode

After commit b94d22d94ad22 "ARM64: dts: meson-gx: add external PHY
interrupt on some platforms" ethernet stopped working on my Odroid-C2
which has a RTL8211F phy.

It turned out that no interrupts were triggered. Further analysis
showed the register INER can't be altered on page 0.
Because register INSR needs to be accessed via page 0xa43 I assumed
that register INER needs to be accessed via some page too.
Some brute force check resulted in page 0xa42 being the right one.

With this patch the phy is working properly in interrupt mode.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/realtek.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index d4670ecdb..eda0a6e86 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -115,11 +115,13 @@ static int rtl8211f_config_intr(struct phy_device *phydev)
 {
 	int err;

+	phy_write(phydev, RTL821x_PAGE_SELECT, 0xa42);
 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 		err = phy_write(phydev, RTL821x_INER,
 				RTL8211F_INER_LINK_STATUS);
 	else
 		err = phy_write(phydev, RTL821x_INER, 0);
+	phy_write(phydev, RTL821x_PAGE_SELECT, 0);

 	return err;
 }
-- 
2.15.0