linux-kernel - [PATCH net-next V4 2/2] net: stmmac: resume PHY separately before calling stmmac_hw

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Date:   Wed, 22 Feb 2023 17:26:36 +0800
From:   Clark Wang <xiaoning.wang@....com>
To:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
        linux@...linux.org.uk, andrew@...n.ch, hkallweit1@...il.com
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH net-next V4 2/2] net: stmmac: resume PHY separately before calling stmmac_hw_setup()

On some platforms, MAC cannot work after resumed from the suspend with WoL
enabled.

We found the stmmac_hw_setup() when system resumes will called after the
stmmac_mac_link_up(). So the correct values set in stmmac_mac_link_up()
are overwritten by stmmac_core_init() in phylink_resume().

So call the new added function in phylink to resume PHY firstly.
Then can call the stmmac_hw_setup() before calling phy_resume().

Fixes: 90702dcd19c0 ("net: stmmac: fix MAC not working when system resume back with WoL active")
Signed-off-by: Clark Wang <xiaoning.wang@....com>
Reviewed-by: Piotr Raczynski <piotr.raczynski@...el.com>
---
V2:
 - add Fixes tag
V3: no change
V4:
 - Unify MAC and PHY in comments and subject to uppercase.
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c    | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e4902a7bb61e..75857b85921a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7541,16 +7541,9 @@ int stmmac_resume(struct device *dev)
 	}
 
 	rtnl_lock();
-	if (device_may_wakeup(priv->device) && priv->plat->pmt) {
-		phylink_resume(priv->phylink);
-	} else {
-		phylink_resume(priv->phylink);
-		if (device_may_wakeup(priv->device))
-			phylink_speed_up(priv->phylink);
-	}
-	rtnl_unlock();
 
-	rtnl_lock();
+	phylink_phy_resume(priv->phylink);
+
 	mutex_lock(&priv->lock);
 
 	stmmac_reset_queues_param(priv);
@@ -7568,6 +7561,11 @@ int stmmac_resume(struct device *dev)
 	stmmac_enable_all_dma_irq(priv);
 
 	mutex_unlock(&priv->lock);
+
+	phylink_resume(priv->phylink);
+	if (device_may_wakeup(priv->device) && !priv->plat->pmt)
+		phylink_speed_up(priv->phylink);
+
 	rtnl_unlock();
 
 	netif_device_attach(ndev);
-- 
2.34.1