linux-kernel - [PATCH net 1/1] net: phy: Reconfigure PHY interrupt in mdio_bus_phy

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Date:   Fri, 22 Jan 2021 15:35:24 +0100
From:   Laurent Badel <laurentbadel@...on.com>
To:     <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, <linux-pm@...r.kernel.org>
CC:     Laurent Badel <laurentbadel@...on.com>
Subject: [PATCH net 1/1] net: phy: Reconfigure PHY interrupt in mdio_bus_phy_restore()

Some PHY (e.g. SMSC LAN87xx) clear their interrupt mask on software
reset. This breaks the ethernet interface on resuming from hibernation,
if the PHY is running in interrupt mode, so reconfigure interrupts
after the software reset in mdio_bus_phy_restore().

Signed-off-by: Laurent Badel <laurentbadel@...on.com>
---
 drivers/net/phy/phy_device.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 80c2e646c093..5070eed55447 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -324,6 +324,15 @@ static int mdio_bus_phy_restore(struct device *dev)
 	if (ret < 0)
 		return ret;
 
+	if (phydev->drv->config_intr && phy_interrupt_is_valid(phydev))
+	{
+		/* Some PHYs (e.g. SMSC LAN8720) clear their
+		 * interrupt mask on software reset.
+		 */
+		phy_free_interrupt(phydev);
+		phy_request_interrupt(phydev);
+	}
+
 	if (phydev->attached_dev && phydev->adjust_link)
 		phy_start_machine(phydev);
 
-- 
2.17.1



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