Merge branch 'net-stmmac-eee-and-wol-cleanups'

Russell King says:

====================
net: stmmac: EEE and WoL cleanups

This series contains a series of cleanup patches for the EEE and WoL
code in stmmac, prompted by issues raised during the last three weeks.
====================

Link: https://patch.msgid.link/aJ8avIp8DBAckgMc@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -602,7 +602,6 @@ struct mac_device_info {
 	unsigned int mcast_bits_log2;
 	unsigned int rx_csum;
 	unsigned int pcs;
-	unsigned int pmt;
 	unsigned int ps;
 	unsigned int xlgmac;
 	unsigned int num_vlan;

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;
@@ -376,6 +375,16 @@ enum stmmac_state {
 
 extern const struct dev_pm_ops stmmac_simple_pm_ops;
 
+static inline bool stmmac_wol_enabled_mac(struct stmmac_priv *priv)
+{
+	return priv->plat->pmt && device_may_wakeup(priv->device);
+}
+
+static inline bool stmmac_wol_enabled_phy(struct stmmac_priv *priv)
+{
+	return !priv->plat->pmt && device_may_wakeup(priv->device);
+}
+
 int stmmac_mdio_unregister(struct net_device *ndev);
 int stmmac_mdio_register(struct net_device *ndev);
 int stmmac_mdio_reset(struct mii_bus *mii);

drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c

@@ -803,7 +803,6 @@ static void stmmac_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
-	u32 support = WAKE_MAGIC | WAKE_UCAST;
 
 	if (!device_can_wakeup(priv->device))
 		return -EOPNOTSUPP;
@@ -816,29 +815,7 @@ static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 		return ret;
 	}
 
-	/* By default almost all GMAC devices support the WoL via
-	 * magic frame but we can disable it if the HW capability
-	 * register shows no support for pmt_magic_frame. */
-	if ((priv->hw_cap_support) && (!priv->dma_cap.pmt_magic_frame))
-		wol->wolopts &= ~WAKE_MAGIC;
-
-	if (wol->wolopts & ~support)
-		return -EINVAL;
-
-	if (wol->wolopts) {
-		pr_info("stmmac: wakeup enable\n");
-		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;
@@ -852,9 +829,6 @@ static int stmmac_ethtool_op_get_eee(struct net_device *dev,
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 
-	if (!priv->dma_cap.eee)
-		return -EOPNOTSUPP;
-
 	return phylink_ethtool_get_eee(priv->phylink, edata);
 }
 
@@ -863,9 +837,6 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 
-	if (!priv->dma_cap.eee)
-		return -EOPNOTSUPP;
-
 	return phylink_ethtool_set_eee(priv->phylink, edata);
 }
 

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);
@@ -4139,8 +4138,13 @@ static int stmmac_release(struct net_device *dev)
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 chan;
 
+	/* If the PHY or MAC has WoL enabled, then the PHY will not be
+	 * suspended when phylink_stop() is called below. Set the PHY
+	 * to its slowest speed to save power.
+	 */
 	if (device_may_wakeup(priv->device))
 		phylink_speed_down(priv->phylink, false);
+
 	/* Stop and disconnect the PHY */
 	phylink_stop(priv->phylink);
 	phylink_disconnect_phy(priv->phylink);
@@ -7240,7 +7244,6 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 		priv->plat->enh_desc = priv->dma_cap.enh_desc;
 		priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up &&
 				!(priv->plat->flags & STMMAC_FLAG_USE_PHY_WOL);
-		priv->hw->pmt = priv->plat->pmt;
 		if (priv->dma_cap.hash_tb_sz) {
 			priv->hw->multicast_filter_bins =
 					(BIT(priv->dma_cap.hash_tb_sz) << 5);
@@ -7278,6 +7281,7 @@ 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)
@@ -7858,7 +7862,7 @@ int stmmac_suspend(struct device *dev)
 		priv->plat->serdes_powerdown(ndev, priv->plat->bsp_priv);
 
 	/* Enable Power down mode by programming the PMT regs */
-	if (device_may_wakeup(priv->device) && priv->plat->pmt) {
+	if (stmmac_wol_enabled_mac(priv)) {
 		stmmac_pmt(priv, priv->hw, priv->wolopts);
 		priv->irq_wake = 1;
 	} else {
@@ -7869,11 +7873,10 @@ int stmmac_suspend(struct device *dev)
 	mutex_unlock(&priv->lock);
 
 	rtnl_lock();
-	if (device_may_wakeup(priv->device) && !priv->plat->pmt)
+	if (stmmac_wol_enabled_phy(priv))
 		phylink_speed_down(priv->phylink, false);
 
-	phylink_suspend(priv->phylink,
-			device_may_wakeup(priv->device) && priv->plat->pmt);
+	phylink_suspend(priv->phylink, stmmac_wol_enabled_mac(priv));
 	rtnl_unlock();
 
 	if (stmmac_fpe_supported(priv))
@@ -7949,7 +7952,7 @@ int stmmac_resume(struct device *dev)
 	 * this bit because it can generate problems while resuming
 	 * from another devices (e.g. serial console).
 	 */
-	if (device_may_wakeup(priv->device) && priv->plat->pmt) {
+	if (stmmac_wol_enabled_mac(priv)) {
 		mutex_lock(&priv->lock);
 		stmmac_pmt(priv, priv->hw, 0);
 		mutex_unlock(&priv->lock);
@@ -8009,7 +8012,7 @@ int stmmac_resume(struct device *dev)
 	 * workqueue thread, which will race with initialisation.
 	 */
 	phylink_resume(priv->phylink);
-	if (device_may_wakeup(priv->device) && !priv->plat->pmt)
+	if (stmmac_wol_enabled_phy(priv))
 		phylink_speed_up(priv->phylink);
 
 	rtnl_unlock();

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

@@ -934,7 +934,7 @@ static int __maybe_unused stmmac_pltfr_noirq_suspend(struct device *dev)
 	if (!netif_running(ndev))
 		return 0;
 
-	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
+	if (!stmmac_wol_enabled_mac(priv)) {
 		/* Disable clock in case of PWM is off */
 		clk_disable_unprepare(priv->plat->clk_ptp_ref);
 
@@ -955,7 +955,7 @@ static int __maybe_unused stmmac_pltfr_noirq_resume(struct device *dev)
 	if (!netif_running(ndev))
 		return 0;
 
-	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
+	if (!stmmac_wol_enabled_mac(priv)) {
 		/* enable the clk previously disabled */
 		ret = pm_runtime_force_resume(dev);
 		if (ret)