linux-kernel - [PATCH] net/phy: micrel: Reenable interrupts during resume

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Message-Id: <1438183274-4631-1-git-send-email-nathan.sullivan@ni.com>
Date:	Wed, 29 Jul 2015 10:21:14 -0500
From:	Nathan Sullivan <nathan.sullivan@...com>
To:	f.fainelli@...il.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nathan Sullivan <nathan.sullivan@...com>
Subject: [PATCH] net/phy: micrel: Reenable interrupts during resume

The ksz9031 has a behavior where it will clear the interrupt enable bits
when leaving power down.  To work around this, make sure the interrupt
bits are in the state they are expected to be when resuming.

Signed-off-by: Nathan Sullivan <nathan.sullivan@...com>
---
 drivers/net/phy/micrel.c |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 499185e..7a93af6 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -447,6 +447,22 @@ static int ksz9031_center_flp_timing(struct phy_device *phydev)
 	return genphy_restart_aneg(phydev);
 }
 
+static int ksz9031_resume(struct phy_device *phydev)
+{
+	int result;
+
+	result = genphy_resume(phydev);
+
+	if (result)
+		return result;
+
+	/* This phy will reset interrupt enables when leaving power down */
+	if (PHY_INTERRUPT_ENABLED & phydev->interrupts)
+		result = kszphy_set_interrupt(phydev);
+
+	return result;
+}
+
 static int ksz9031_config_init(struct phy_device *phydev)
 {
 	const struct device *dev = &phydev->dev;
@@ -776,7 +792,7 @@ static struct phy_driver ksphy_driver[] = {
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
-	.resume		= genphy_resume,
+	.resume		= ksz9031_resume,
 	.driver		= { .owner = THIS_MODULE, },
 }, {
 	.phy_id		= PHY_ID_KSZ8873MLL,
-- 
1.7.10.4

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