linux-kernel - [PATCH net-next] net: bcmgenet: Support wake-up from s2idle

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Date:   Fri, 17 Feb 2023 10:34:14 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Doug Berger <opendmb@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next] net: bcmgenet: Support wake-up from s2idle

When we suspend into s2idle we also need to enable the interrupt line
that generates the MPD and HFB interrupts towards the host CPU interrupt
controller (typically the ARM GIC or MIPS L1) to make it exit s2idle.

When we suspend into other modes such as "standby" or "mem" we engage a
power management state machine which will gate off the CPU L1 controller
(priv->irq0) and ungate the side band wake-up interrupt (priv->wol_irq).
It is safe to have both enabled as wake-up sources because they are
mutually exclusive given any suspend mode.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
index f55d9d9c01a8..3a4b6cb7b7b9 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
@@ -77,14 +77,18 @@ int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 	if (wol->wolopts) {
 		device_set_wakeup_enable(kdev, 1);
 		/* Avoid unbalanced enable_irq_wake calls */
-		if (priv->wol_irq_disabled)
+		if (priv->wol_irq_disabled) {
 			enable_irq_wake(priv->wol_irq);
+			enable_irq_wake(priv->irq0);
+		}
 		priv->wol_irq_disabled = false;
 	} else {
 		device_set_wakeup_enable(kdev, 0);
 		/* Avoid unbalanced disable_irq_wake calls */
-		if (!priv->wol_irq_disabled)
+		if (!priv->wol_irq_disabled) {
 			disable_irq_wake(priv->wol_irq);
+			disable_irq_wake(priv->irq0);
+		}
 		priv->wol_irq_disabled = true;
 	}
 
-- 
2.34.1