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From:   Christophe Roullier <christophe.roullier@foss.st.com>
To:     "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Jose Abreu <joabreu@synopsys.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Christophe Roullier <christophe.roullier@foss.st.com>
CC:     <netdev@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 07/12] net: ethernet: stm32: clean the way to manage wol irqwake
Date:   Thu, 28 Sep 2023 14:24:22 +0200
Message-ID: <20230928122427.313271-8-christophe.roullier@foss.st.com>
In-Reply-To: <20230928122427.313271-1-christophe.roullier@foss.st.com>
References: <20230928122427.313271-1-christophe.roullier@foss.st.com>
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From: Christophe Roullier <christophe.roullier@st.com>

On STM32 platforms it is no longer needed to use a dedicated wakeup to
wake up system from CStop. This patch removes the dedicated wake up usage
and clean the way to register the wake up irq.

Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 64 +++++++++----------
 1 file changed, 31 insertions(+), 33 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 1210062f0832a..72dda71850d75 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -81,7 +81,6 @@ struct stm32_dwmac {
 	int enable_eth_ck;
 	int eth_clk_sel_reg;
 	int eth_ref_clk_sel_reg;
-	int irq_pwr_wakeup;
 	u32 mode_reg;		 /* MAC glue-logic mode register */
 	u32 mode_mask;
 	struct regmap *regmap;
@@ -316,9 +315,7 @@ static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
 static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
 			       struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
 	struct device_node *np = dev->of_node;
-	int err = 0;
 
 	/* Ethernet PHY have no crystal */
 	dwmac->ext_phyclk = of_property_read_bool(np, "st,ext-phyclk");
@@ -350,29 +347,24 @@ static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
 	if (IS_ERR(dwmac->syscfg_clk))
 		dwmac->syscfg_clk = NULL;
 
-	/* Get IRQ information early to have an ability to ask for deferred
-	 * probe if needed before we went too far with resource allocation.
-	 */
-	dwmac->irq_pwr_wakeup = platform_get_irq_byname_optional(pdev,
-							"stm32_pwr_wakeup");
-	if (dwmac->irq_pwr_wakeup == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-
-	if (!dwmac->clk_eth_ck && dwmac->irq_pwr_wakeup >= 0) {
-		err = device_init_wakeup(&pdev->dev, true);
-		if (err) {
-			dev_err(&pdev->dev, "Failed to init wake up irq\n");
-			return err;
-		}
-		err = dev_pm_set_dedicated_wake_irq(&pdev->dev,
-						    dwmac->irq_pwr_wakeup);
-		if (err) {
-			dev_err(&pdev->dev, "Failed to set wake up irq\n");
-			device_init_wakeup(&pdev->dev, false);
-		}
-		device_set_wakeup_enable(&pdev->dev, false);
+	return 0;
+}
+
+static int stm32_dwmac_wake_init(struct device *dev,
+				 struct stmmac_resources *stmmac_res)
+{
+	int err;
+
+	device_set_wakeup_capable(dev, true);
+
+	err = dev_pm_set_wake_irq(dev, stmmac_res->wol_irq);
+	if (err) {
+		dev_err(dev, "Failed to set wake up irq\n");
+		device_set_wakeup_capable(dev, false);
+		return err;
 	}
-	return err;
+
+	return 0;
 }
 
 static int stm32_dwmac_probe(struct platform_device *pdev)
@@ -410,11 +402,17 @@ static int stm32_dwmac_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	if (stmmac_res.wol_irq && !dwmac->clk_eth_ck) {
+		ret = stm32_dwmac_wake_init(&pdev->dev, &stmmac_res);
+		if (ret)
+			goto err_wake_init_disable;
+	}
+
 	plat_dat->bsp_priv = dwmac;
 
 	ret = stm32_dwmac_init(plat_dat);
 	if (ret)
-		return ret;
+		goto err_wake_init_disable;
 
 	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 	if (ret)
@@ -424,7 +422,11 @@ static int stm32_dwmac_probe(struct platform_device *pdev)
 
 err_clk_disable:
 	stm32_dwmac_clk_disable(dwmac);
-
+err_wake_init_disable:
+	if (stmmac_res.wol_irq && !dwmac->clk_eth_ck) {
+		dev_pm_clear_wake_irq(&pdev->dev);
+		device_set_wakeup_capable(&pdev->dev, false);
+	}
 	return ret;
 }
 
@@ -432,16 +434,12 @@ static void stm32_dwmac_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct stmmac_priv *priv = netdev_priv(ndev);
-	struct stm32_dwmac *dwmac = priv->plat->bsp_priv;
 
 	stmmac_dvr_remove(&pdev->dev);
-
 	stm32_dwmac_clk_disable(priv->plat->bsp_priv);
 
-	if (dwmac->irq_pwr_wakeup >= 0) {
-		dev_pm_clear_wake_irq(&pdev->dev);
-		device_init_wakeup(&pdev->dev, false);
-	}
+	dev_pm_clear_wake_irq(&pdev->dev);
+	device_init_wakeup(&pdev->dev, false);
 }
 
 static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
-- 
2.25.1