netdev - [PATCH net-next] net: phy: add wol config options in phy device

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Date: Tue, 30 Apr 2024 10:36:35 +0530
From: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
To: <netdev@...r.kernel.org>
CC: <lxu@...linear.com>, <andrew@...n.ch>, <hkallweit1@...il.com>,
	<linux@...linux.org.uk>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <linux-kernel@...r.kernel.org>,
	<UNGLinuxDriver@...rochip.com>
Subject: [PATCH net-next] net: phy: add wol config options in phy device

Introduce a new member named 'wolopts' to the 'phy_device' structure to
store the user-specified Wake-on-LAN (WOL) settings. Update this member
within the phy driver's 'set_wol()' function whenever the WOL configuration
is modified by the user.

Currently, when the system resumes from sleep, the 'phy_init_hw()' function
resets the PHY's configuration and interrupts, which leads to problems upon
subsequent WOL attempts. By retaining the desired WOL settings in 'wolopts',
we can ensure that the PHY's WOL configuration is correctly reapplied
through 'phy_ethtool_set_wol()' before a system suspend, thereby resolving
the issue

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
---
 drivers/net/phy/mxl-gpy.c    | 5 +++++
 drivers/net/phy/phy_device.c | 5 +++++
 include/linux/phy.h          | 2 ++
 3 files changed, 12 insertions(+)

diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
index b2d36a3a96f1..6edb29a1d77e 100644
--- a/drivers/net/phy/mxl-gpy.c
+++ b/drivers/net/phy/mxl-gpy.c
@@ -680,6 +680,7 @@ static int gpy_set_wol(struct phy_device *phydev,
 	struct net_device *attach_dev = phydev->attached_dev;
 	int ret;
 
+	phydev->wolopts = 0;
 	if (wol->wolopts & WAKE_MAGIC) {
 		/* MAC address - Byte0:Byte1:Byte2:Byte3:Byte4:Byte5
 		 * VPSPEC2_WOL_AD45 = Byte0:Byte1
@@ -725,6 +726,8 @@ static int gpy_set_wol(struct phy_device *phydev,
 		ret = phy_read(phydev, PHY_ISTAT);
 		if (ret < 0)
 			return ret;
+
+		phydev->wolopts |= WAKE_MAGIC;
 	} else {
 		/* Disable magic packet matching */
 		ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
@@ -748,6 +751,8 @@ static int gpy_set_wol(struct phy_device *phydev,
 		if (ret & (PHY_IMASK_MASK & ~PHY_IMASK_LSTC))
 			phy_trigger_machine(phydev);
 
+		phydev->wolopts |= WAKE_PHY;
+
 		return 0;
 	}
 
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 616bd7ba46cb..9740f08ad98e 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2038,6 +2038,11 @@ int phy_suspend(struct phy_device *phydev)
 	if (phydev->suspended)
 		return 0;
 
+	if (phydev->wolopts) {
+		wol.wolopts = phydev->wolopts;
+		phy_ethtool_set_wol(phydev, &wol);
+	}
+
 	phy_ethtool_get_wol(phydev, &wol);
 	phydev->wol_enabled = wol.wolopts || (netdev && netdev->wol_enabled);
 	/* If the device has WOL enabled, we cannot suspend the PHY */
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 3ddfe7fe781a..4a628202699c 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -615,6 +615,7 @@ struct macsec_ops;
  *                 handling shall be postponed until PHY has resumed
  * @irq_rerun: Flag indicating interrupts occurred while PHY was suspended,
  *             requiring a rerun of the interrupt handler after resume
+ * @wolopts: User requested wake-on-lan configuration
  * @interface: enum phy_interface_t value
  * @possible_interfaces: bitmap if interface modes that the attached PHY
  *			 will switch between depending on media speed.
@@ -687,6 +688,7 @@ struct phy_device {
 
 	u32 dev_flags;
 
+	u32 wolopts;
 	phy_interface_t interface;
 	DECLARE_PHY_INTERFACE_MASK(possible_interfaces);
 
-- 
2.34.1