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Date:   Thu, 30 Apr 2020 16:26:51 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Doug Berger <opendmb@...il.com>
Subject: [PATCH net-next] net: bcmgenet: Move wake-up event out of side band ISR

The side band interrupt service routine is not available on chips
like 7211, or rather, it does not permit the signaling of wake-up
events due to the complex interrupt hierarchy.

Move the wake-up event accounting into a .resume_noirq function,
account for possible wake-up events and clear the MPD/HFB interrupts
from there, while leaving the hardware untouched until the resume
function proceeds with doing its usual business.

Because bcmgenet_wol_power_down_cfg() now enables the MPD and HFB
interrupts, it is invoked by a .suspend_noirq function to prevent
the servicing of interrupts after the clocks have been disabled.

Signed-off-by: Doug Berger <opendmb@...il.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c     | 72 ++++++++++++++++++----
 drivers/net/ethernet/broadcom/genet/bcmgenet.h     |  2 +
 drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c |  6 ++
 3 files changed, 67 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index ad614d7201bd..ff31da0ed846 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -3270,10 +3270,7 @@ static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
 
 static irqreturn_t bcmgenet_wol_isr(int irq, void *dev_id)
 {
-	struct bcmgenet_priv *priv = dev_id;
-
-	pm_wakeup_event(&priv->pdev->dev, 0);
-
+	/* Acknowledge the interrupt */
 	return IRQ_HANDLED;
 }
 
@@ -4174,13 +4171,12 @@ static void bcmgenet_shutdown(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int bcmgenet_resume(struct device *d)
+static int bcmgenet_resume_noirq(struct device *d)
 {
 	struct net_device *dev = dev_get_drvdata(d);
 	struct bcmgenet_priv *priv = netdev_priv(dev);
-	unsigned long dma_ctrl;
-	u32 offset, reg;
 	int ret;
+	u32 reg;
 
 	if (!netif_running(dev))
 		return 0;
@@ -4190,6 +4186,34 @@ static int bcmgenet_resume(struct device *d)
 	if (ret)
 		return ret;
 
+	if (device_may_wakeup(d) && priv->wolopts) {
+		/* Account for Wake-on-LAN events and clear those events
+		 * (Some devices need more time between enabling the clocks
+		 *  and the interrupt register reflecting the wake event so
+		 *  read the register twice)
+		 */
+		reg = bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_STAT);
+		reg = bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_STAT);
+		if (reg & UMAC_IRQ_WAKE_EVENT)
+			pm_wakeup_event(&priv->pdev->dev, 0);
+	}
+
+	bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_WAKE_EVENT, INTRL2_CPU_CLEAR);
+
+	return 0;
+}
+
+static int bcmgenet_resume(struct device *d)
+{
+	struct net_device *dev = dev_get_drvdata(d);
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+	unsigned long dma_ctrl;
+	u32 offset, reg;
+	int ret;
+
+	if (!netif_running(dev))
+		return 0;
+
 	/* From WOL-enabled suspend, switch to regular clock */
 	if (device_may_wakeup(d) && priv->wolopts)
 		bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);
@@ -4262,7 +4286,6 @@ static int bcmgenet_suspend(struct device *d)
 {
 	struct net_device *dev = dev_get_drvdata(d);
 	struct bcmgenet_priv *priv = netdev_priv(dev);
-	int ret = 0;
 	u32 offset;
 
 	if (!netif_running(dev))
@@ -4282,23 +4305,46 @@ static int bcmgenet_suspend(struct device *d)
 	priv->hfb_en[2] = bcmgenet_hfb_reg_readl(priv, offset + sizeof(u32));
 	bcmgenet_hfb_reg_writel(priv, 0, HFB_CTRL);
 
+	return 0;
+}
+
+static int bcmgenet_suspend_noirq(struct device *d)
+{
+	struct net_device *dev = dev_get_drvdata(d);
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+	int ret = 0;
+
+	if (!netif_running(dev))
+		return 0;
+
 	/* Prepare the device for Wake-on-LAN and switch to the slow clock */
 	if (device_may_wakeup(d) && priv->wolopts)
 		ret = bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
 	else if (priv->internal_phy)
 		ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
 
+	/* Let the framework handle resumption and leave the clocks on */
+	if (ret)
+		return ret;
+
 	/* Turn off the clocks */
 	clk_disable_unprepare(priv->clk);
 
-	if (ret)
-		bcmgenet_resume(d);
-
-	return ret;
+	return 0;
 }
+#else
+#define bcmgenet_suspend	NULL
+#define bcmgenet_suspend_noirq	NULL
+#define bcmgenet_resume		NULL
+#define bcmgenet_resume_noirq	NULL
 #endif /* CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(bcmgenet_pm_ops, bcmgenet_suspend, bcmgenet_resume);
+static const struct dev_pm_ops bcmgenet_pm_ops = {
+	.suspend	= bcmgenet_suspend,
+	.suspend_noirq	= bcmgenet_suspend_noirq,
+	.resume		= bcmgenet_resume,
+	.resume_noirq	= bcmgenet_resume_noirq,
+};
 
 static const struct acpi_device_id genet_acpi_match[] = {
 	{ "BCM6E4E", (kernel_ulong_t)&bcm2711_plat_data },
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
index 031d91f45067..a12cb59298f4 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
@@ -312,6 +312,8 @@ struct bcmgenet_mib_counters {
 #define UMAC_IRQ_HFB_SM			(1 << 10)
 #define UMAC_IRQ_HFB_MM			(1 << 11)
 #define UMAC_IRQ_MPD_R			(1 << 12)
+#define UMAC_IRQ_WAKE_EVENT		(UMAC_IRQ_HFB_SM | UMAC_IRQ_HFB_MM | \
+					 UMAC_IRQ_MPD_R)
 #define UMAC_IRQ_RXDMA_MBDONE		(1 << 13)
 #define UMAC_IRQ_RXDMA_PDONE		(1 << 14)
 #define UMAC_IRQ_RXDMA_BDONE		(1 << 15)
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
index 4b9d65f392c2..4ea6a26b04f7 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
@@ -193,6 +193,12 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
 		bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
 	}
 
+	reg = UMAC_IRQ_MPD_R;
+	if (hfb_enable)
+		reg |=  UMAC_IRQ_HFB_SM | UMAC_IRQ_HFB_MM;
+
+	bcmgenet_intrl2_0_writel(priv, reg, INTRL2_CPU_MASK_CLEAR);
+
 	return 0;
 }
 
-- 
2.7.4

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