linux-kernel - [PATCH] net: phy: marvell: clear wol event before setting it

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Message-ID: <20180419160232.519d15be@xhacker.debian>
Date:   Thu, 19 Apr 2018 16:02:32 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jingju Hou <Jingju.Hou@...aptics.com>
Subject: [PATCH] net: phy: marvell: clear wol event before setting it

From: Jingju Hou <Jingju.Hou@...aptics.com>

If WOL event happened once, the LED[2] interrupt pin will not be
cleared unless reading the CSISR register. So clear the WOL event
before enabling it.

Signed-off-by: Jingju Hou <Jingju.Hou@...aptics.com>
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 drivers/net/phy/marvell.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index c22e8e383247..b6abe1cbc84b 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -115,6 +115,9 @@
 /* WOL Event Interrupt Enable */
 #define MII_88E1318S_PHY_CSIER_WOL_EIE			BIT(7)
 
+/* Copper Specific Interrupt Status Register */
+#define MII_88E1318S_PHY_CSISR				0x13
+
 /* LED Timer Control Register */
 #define MII_88E1318S_PHY_LED_TCR			0x12
 #define MII_88E1318S_PHY_LED_TCR_FORCE_INT		BIT(15)
@@ -1393,6 +1396,12 @@ static int m88e1318_set_wol(struct phy_device *phydev,
 		if (err < 0)
 			goto error;
 
+		/* If WOL event happened once, the LED[2] interrupt pin
+		 * will not be cleared unless reading the CSISR register.
+		 * So clear the WOL event first before enabling it.
+		 */
+		phy_read(phydev, MII_88E1318S_PHY_CSISR);
+
 		/* Enable the WOL interrupt */
 		err = __phy_modify(phydev, MII_88E1318S_PHY_CSIER, 0,
 				   MII_88E1318S_PHY_CSIER_WOL_EIE);
-- 
2.17.0