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Date:   Mon,  7 Dec 2020 19:38:49 +0800
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-imx@....com,
        Jisheng.Zhang@...aptics.com
Subject: [PATCH RFC] ethernet: stmmac: clean up the code for release/suspend/resume function

commit 1c35cc9cf6a0 ("net: stmmac: remove redundant null check before clk_disable_unprepare()"),
have not clean up check NULL clock parameter completely, this patch did it.

commit e8377e7a29efb ("net: stmmac: only call pmt() during suspend/resume if HW enables PMT"),
after this patch, we use
if (device_may_wakeup(priv->device) && priv->plat->pmt) check MAC wakeup
if (device_may_wakeup(priv->device)) check PHY wakeup
Add oneline comment for readability.

commit 77b2898394e3b ("net: stmmac: Speed down the PHY if WoL to save energy"),
slow down phy speed when release net device under any condition.

Slightly adjust the order of the codes so that suspend/resume look more
symmetrical, generally speaking they should appear symmetrically.

Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 22 +++++++++----------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c33db79cdd0a..a46e865c4acc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2908,8 +2908,7 @@ static int stmmac_release(struct net_device *dev)
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 chan;
 
-	if (device_may_wakeup(priv->device))
-		phylink_speed_down(priv->phylink, false);
+	phylink_speed_down(priv->phylink, false);
 	/* Stop and disconnect the PHY */
 	phylink_stop(priv->phylink);
 	phylink_disconnect_phy(priv->phylink);
@@ -5183,6 +5182,7 @@ int stmmac_suspend(struct device *dev)
 	} else {
 		mutex_unlock(&priv->lock);
 		rtnl_lock();
+		/* For PHY wakeup case */
 		if (device_may_wakeup(priv->device))
 			phylink_speed_down(priv->phylink, false);
 		phylink_stop(priv->phylink);
@@ -5260,11 +5260,17 @@ int stmmac_resume(struct device *dev)
 		/* enable the clk previously disabled */
 		clk_prepare_enable(priv->plat->stmmac_clk);
 		clk_prepare_enable(priv->plat->pclk);
-		if (priv->plat->clk_ptp_ref)
-			clk_prepare_enable(priv->plat->clk_ptp_ref);
+		clk_prepare_enable(priv->plat->clk_ptp_ref);
 		/* reset the phy so that it's ready */
 		if (priv->mii)
 			stmmac_mdio_reset(priv->mii);
+
+		rtnl_lock();
+		phylink_start(priv->phylink);
+		/* We may have called phylink_speed_down before */
+		if (device_may_wakeup(priv->device))
+			phylink_speed_up(priv->phylink);
+		rtnl_unlock();
 	}
 
 	if (priv->plat->serdes_powerup) {
@@ -5275,14 +5281,6 @@ int stmmac_resume(struct device *dev)
 			return ret;
 	}
 
-	if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
-		rtnl_lock();
-		phylink_start(priv->phylink);
-		/* We may have called phylink_speed_down before */
-		phylink_speed_up(priv->phylink);
-		rtnl_unlock();
-	}
-
 	rtnl_lock();
 	mutex_lock(&priv->lock);
 
-- 
2.17.1

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