Merge branch 'ravb-rutime-PM-support'

Claudiu Beznea says:

====================
net: ravb: Add runtime PM support (part 2)

Series adds runtime PM support for the ravb driver. This is a continuation
of [1].

There are 5 more preparation patches (patches 1-5) and patch 6
adds runtime PM support.

Patches in this series were part of [2].

Changes in v4:
- remove unnecessary code from patch 4/6
- improve the code in patch 5/6

Changes in v3:
- fixed typos
- added patch "net: ravb: Move the update of ndev->features to
  ravb_set_features()"
- changes title of patch "net: ravb: Do not apply RX checksum
  settings to hardware if the interface is down" from v2 into
  "net: ravb: Do not apply features to hardware if the interface
  is down", changed patch description and updated the patch
- collected tags

Changes in v2:
- address review comments
- in patch 4/5 take into account the latest changes introduced
  in ravb_set_features_gbeth()

Changes since [2]:
- patch 1/5 is new
- use pm_runtime_get_noresume() and pm_runtime_active() in patches
  3/5, 4/5
- fixed higlighted typos in patch 4/5

[1] https://lore.kernel.org/all/20240202084136.3426492-1-claudiu.beznea.uj@bp.renesas.com/
[2] https://lore.kernel.org/all/20240105082339.1468817-1-claudiu.beznea.uj@bp.renesas.com/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb_main.c

@@ -1935,16 +1935,21 @@ static int ravb_open(struct net_device *ndev)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	struct device *dev = &priv->pdev->dev;
 	int error;
 
 	napi_enable(&priv->napi[RAVB_BE]);
 	if (info->nc_queues)
 		napi_enable(&priv->napi[RAVB_NC]);
 
+	error = pm_runtime_resume_and_get(dev);
+	if (error < 0)
+		goto out_napi_off;
+
 	/* Set AVB config mode */
 	error = ravb_set_config_mode(ndev);
 	if (error)
-		goto out_napi_off;
+		goto out_rpm_put;
 
 	ravb_set_delay_mode(ndev);
 	ravb_write(ndev, priv->desc_bat_dma, DBAT);
@@ -1978,6 +1983,9 @@ static int ravb_open(struct net_device *ndev)
 	ravb_stop_dma(ndev);
 out_set_reset:
 	ravb_set_opmode(ndev, CCC_OPC_RESET);
+out_rpm_put:
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 out_napi_off:
 	if (info->nc_queues)
 		napi_disable(&priv->napi[RAVB_NC]);
@@ -2244,8 +2252,15 @@ static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
 	struct net_device_stats *nstats, *stats0, *stats1;
+	struct device *dev = &priv->pdev->dev;
 
 	nstats = &ndev->stats;
+
+	pm_runtime_get_noresume(dev);
+
+	if (!pm_runtime_active(dev))
+		goto out_rpm_put;
+
 	stats0 = &priv->stats[RAVB_BE];
 
 	if (info->tx_counters) {
@@ -2287,6 +2302,8 @@ static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 		nstats->rx_over_errors += stats1->rx_over_errors;
 	}
 
+out_rpm_put:
+	pm_runtime_put_noidle(dev);
 	return nstats;
 }
 
@@ -2309,6 +2326,8 @@ static int ravb_close(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
 	struct ravb_tstamp_skb *ts_skb, *ts_skb2;
+	struct device *dev = &priv->pdev->dev;
+	int error;
 
 	netif_tx_stop_all_queues(ndev);
 
@@ -2317,6 +2336,14 @@ static int ravb_close(struct net_device *ndev)
 	ravb_write(ndev, 0, RIC2);
 	ravb_write(ndev, 0, TIC);
 
+	/* PHY disconnect */
+	if (ndev->phydev) {
+		phy_stop(ndev->phydev);
+		phy_disconnect(ndev->phydev);
+		if (of_phy_is_fixed_link(np))
+			of_phy_deregister_fixed_link(np);
+	}
+
 	/* Stop PTP Clock driver */
 	if (info->gptp || info->ccc_gac)
 		ravb_ptp_stop(ndev);
@@ -2335,14 +2362,6 @@ static int ravb_close(struct net_device *ndev)
 		}
 	}
 
-	/* PHY disconnect */
-	if (ndev->phydev) {
-		phy_stop(ndev->phydev);
-		phy_disconnect(ndev->phydev);
-		if (of_phy_is_fixed_link(np))
-			of_phy_deregister_fixed_link(np);
-	}
-
 	cancel_work_sync(&priv->work);
 
 	if (info->nc_queues)
@@ -2354,8 +2373,18 @@ static int ravb_close(struct net_device *ndev)
 	if (info->nc_queues)
 		ravb_ring_free(ndev, RAVB_NC);
 
+	/* Update statistics. */
+	ravb_get_stats(ndev);
+
 	/* Set reset mode. */
-	return ravb_set_opmode(ndev, CCC_OPC_RESET);
+	error = ravb_set_opmode(ndev, CCC_OPC_RESET);
+	if (error)
+		return error;
+
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
+	return 0;
 }
 
 static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
@@ -2526,7 +2555,6 @@ static int ravb_set_features_gbeth(struct net_device *ndev,
 			goto done;
 	}
 
-	ndev->features = features;
 done:
 	spin_unlock_irqrestore(&priv->lock, flags);
 
@@ -2541,8 +2569,6 @@ static int ravb_set_features_rcar(struct net_device *ndev,
 	if (changed & NETIF_F_RXCSUM)
 		ravb_set_rx_csum(ndev, features & NETIF_F_RXCSUM);
 
-	ndev->features = features;
-
 	return 0;
 }
 
@@ -2551,8 +2577,24 @@ static int ravb_set_features(struct net_device *ndev,
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	struct device *dev = &priv->pdev->dev;
+	int ret;
+
+	pm_runtime_get_noresume(dev);
+
+	if (pm_runtime_active(dev))
+		ret = info->set_feature(ndev, features);
+	else
+		ret = 0;
+
+	pm_runtime_put_noidle(dev);
+
+	if (ret)
+		return ret;
+
+	ndev->features = features;
 
-	return info->set_feature(ndev, features);
+	return 0;
 }
 
 static const struct net_device_ops ravb_netdev_ops = {
@@ -2743,24 +2785,27 @@ static int ravb_setup_irq(struct ravb_private *priv, const char *irq_name,
 	struct device *dev = &pdev->dev;
 	const char *dev_name;
 	unsigned long flags;
-	int error;
+	int error, irq_num;
 
 	if (irq_name) {
 		dev_name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", ndev->name, ch);
 		if (!dev_name)
 			return -ENOMEM;
 
-		*irq = platform_get_irq_byname(pdev, irq_name);
+		irq_num = platform_get_irq_byname(pdev, irq_name);
 		flags = 0;
 	} else {
 		dev_name = ndev->name;
-		*irq = platform_get_irq(pdev, 0);
+		irq_num = platform_get_irq(pdev, 0);
 		flags = IRQF_SHARED;
 	}
-	if (*irq < 0)
-		return *irq;
+	if (irq_num < 0)
+		return irq_num;
 
-	error = devm_request_irq(dev, *irq, handler, flags, dev_name, ndev);
+	if (irq)
+		*irq = irq_num;
+
+	error = devm_request_irq(dev, irq_num, handler, flags, dev_name, ndev);
 	if (error)
 		netdev_err(ndev, "cannot request IRQ %s\n", dev_name);
 
@@ -2772,7 +2817,7 @@ static int ravb_setup_irqs(struct ravb_private *priv)
 	const struct ravb_hw_info *info = priv->info;
 	struct net_device *ndev = priv->ndev;
 	const char *irq_name, *emac_irq_name;
-	int error, irq;
+	int error;
 
 	if (!info->multi_irqs)
 		return ravb_setup_irq(priv, NULL, NULL, &ndev->irq, ravb_interrupt);
@@ -2795,28 +2840,28 @@ static int ravb_setup_irqs(struct ravb_private *priv)
 		return error;
 
 	if (info->err_mgmt_irqs) {
-		error = ravb_setup_irq(priv, "err_a", "err_a", &irq, ravb_multi_interrupt);
+		error = ravb_setup_irq(priv, "err_a", "err_a", NULL, ravb_multi_interrupt);
 		if (error)
 			return error;
 
-		error = ravb_setup_irq(priv, "mgmt_a", "mgmt_a", &irq, ravb_multi_interrupt);
+		error = ravb_setup_irq(priv, "mgmt_a", "mgmt_a", NULL, ravb_multi_interrupt);
 		if (error)
 			return error;
 	}
 
-	error = ravb_setup_irq(priv, "ch0", "ch0:rx_be", &irq, ravb_be_interrupt);
+	error = ravb_setup_irq(priv, "ch0", "ch0:rx_be", NULL, ravb_be_interrupt);
 	if (error)
 		return error;
 
-	error = ravb_setup_irq(priv, "ch1", "ch1:rx_nc", &irq, ravb_nc_interrupt);
+	error = ravb_setup_irq(priv, "ch1", "ch1:rx_nc", NULL, ravb_nc_interrupt);
 	if (error)
 		return error;
 
-	error = ravb_setup_irq(priv, "ch18", "ch18:tx_be", &irq, ravb_be_interrupt);
+	error = ravb_setup_irq(priv, "ch18", "ch18:tx_be", NULL, ravb_be_interrupt);
 	if (error)
 		return error;
 
-	return ravb_setup_irq(priv, "ch19", "ch19:tx_nc", &irq, ravb_nc_interrupt);
+	return ravb_setup_irq(priv, "ch19", "ch19:tx_nc", NULL, ravb_nc_interrupt);
 }
 
 static int ravb_probe(struct platform_device *pdev)
@@ -2894,6 +2939,8 @@ static int ravb_probe(struct platform_device *pdev)
 	clk_prepare(priv->refclk);
 
 	platform_set_drvdata(pdev, ndev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
+	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	error = pm_runtime_resume_and_get(&pdev->dev);
 	if (error < 0)
@@ -2999,6 +3046,9 @@ static int ravb_probe(struct platform_device *pdev)
 	netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
 		    (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
 
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+
 	return 0;
 
 out_napi_del:
@@ -3016,6 +3066,7 @@ static int ravb_probe(struct platform_device *pdev)
 	pm_runtime_put(&pdev->dev);
 out_rpm_disable:
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	clk_unprepare(priv->refclk);
 out_reset_assert:
 	reset_control_assert(rstc);
@@ -3029,6 +3080,12 @@ static void ravb_remove(struct platform_device *pdev)
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	struct device *dev = &priv->pdev->dev;
+	int error;
+
+	error = pm_runtime_resume_and_get(dev);
+	if (error < 0)
+		return;
 
 	unregister_netdev(ndev);
 	if (info->nc_queues)
@@ -3040,8 +3097,9 @@ static void ravb_remove(struct platform_device *pdev)
 	dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
 			  priv->desc_bat_dma);
 
-	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_put_sync_suspend(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	pm_runtime_dont_use_autosuspend(dev);
 	clk_unprepare(priv->refclk);
 	reset_control_assert(priv->rstc);
 	free_netdev(ndev);
@@ -3123,6 +3181,10 @@ static int ravb_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
+	ret = pm_runtime_force_suspend(&priv->pdev->dev);
+	if (ret)
+		return ret;
+
 reset_assert:
 	return reset_control_assert(priv->rstc);
 }
@@ -3145,16 +3207,28 @@ static int ravb_resume(struct device *dev)
 		ret = ravb_wol_restore(ndev);
 		if (ret)
 			return ret;
+	} else {
+		ret = pm_runtime_force_resume(dev);
+		if (ret)
+			return ret;
 	}
 
 	/* Reopening the interface will restore the device to the working state. */
 	ret = ravb_open(ndev);
 	if (ret < 0)
-		return ret;
+		goto out_rpm_put;
 
 	ravb_set_rx_mode(ndev);
 	netif_device_attach(ndev);
 
+	return 0;
+
+out_rpm_put:
+	if (!priv->wol_enabled) {
+		pm_runtime_mark_last_busy(dev);
+		pm_runtime_put_autosuspend(dev);
+	}
+
 	return ret;
 }