netdev - [PATCH RFC net-next 5/7] net: stmmac: use core wake IRQ support

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Message-Id: <E1ugQ2y-006KDL-K7@rmk-PC.armlinux.org.uk>
Date: Mon, 28 Jul 2025 16:45:52 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH RFC net-next 5/7] net: stmmac: use core wake IRQ support

The PM core provides management of wake IRQs along side setting the
device wake enable state. In order to use this, we need to register
the interrupt used to wakeup the system using devm_pm_set_wake_irq()
or dev_pm_set_wake_irq(). The core will then enable or disable IRQ
wake state on this interrupt as appropriate.

Make use of this functionality, rather than explicitly managing the
IRQ enable state in the set_wol() ethtool op. This removes the IRQ
wake state management from stmmac.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |  1 -
 .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   | 14 +-------------
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |  4 ++--
 3 files changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index cda09cf5dcca..e1df59a643e3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -289,7 +289,6 @@ struct stmmac_priv {
 	u32 msg_enable;
 	int wolopts;
 	int wol_irq;
-	bool wol_irq_disabled;
 	int clk_csr;
 	struct timer_list eee_ctrl_timer;
 	int lpi_irq;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 58542b72cc01..39fa1ec92f82 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -815,19 +815,7 @@ static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 		return ret;
 	}
 
-	if (wol->wolopts) {
-		device_set_wakeup_enable(priv->device, 1);
-		/* Avoid unbalanced enable_irq_wake calls */
-		if (priv->wol_irq_disabled)
-			enable_irq_wake(priv->wol_irq);
-		priv->wol_irq_disabled = false;
-	} else {
-		device_set_wakeup_enable(priv->device, 0);
-		/* Avoid unbalanced disable_irq_wake calls */
-		if (!priv->wol_irq_disabled)
-			disable_irq_wake(priv->wol_irq);
-		priv->wol_irq_disabled = true;
-	}
+	device_set_wakeup_enable(priv->device, !!wol->wolopts);
 
 	mutex_lock(&priv->lock);
 	priv->wolopts = wol->wolopts;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6a4ef32f57ec..7d467b494685 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -29,6 +29,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/prefetch.h>
 #include <linux/pinctrl/consumer.h>
 #ifdef CONFIG_DEBUG_FS
@@ -3724,7 +3725,6 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
 	/* Request the Wake IRQ in case of another line
 	 * is used for WoL
 	 */
-	priv->wol_irq_disabled = true;
 	if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
 		int_name = priv->int_name_wol;
 		sprintf(int_name, "%s:%s", dev->name, "wol");
@@ -3885,7 +3885,6 @@ static int stmmac_request_irq_single(struct net_device *dev)
 	/* Request the Wake IRQ in case of another line
 	 * is used for WoL
 	 */
-	priv->wol_irq_disabled = true;
 	if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
 		ret = request_irq(priv->wol_irq, stmmac_interrupt,
 				  IRQF_SHARED, dev->name, dev);
@@ -7277,6 +7276,7 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 	if (priv->plat->pmt) {
 		dev_info(priv->device, "Wake-Up On Lan supported\n");
 		device_set_wakeup_capable(priv->device, 1);
+		devm_pm_set_wake_irq(priv->device, priv->wol_irq);
 	}
 
 	if (priv->dma_cap.tsoen)
-- 
2.30.2