[PATCH 5.9 15/49] net: stmmac: start phylink instance before stmmac_hw_setup() - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Fugang Duan <fugang.duan@nxp.com>,
	Joakim Zhang <qiangqing.zhang@nxp.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.9 15/49] net: stmmac: start phylink instance before stmmac_hw_setup()
Date: Sat, 19 Dec 2020 13:58:19 +0100	[thread overview]
Message-ID: <20201219125345.424895485@linuxfoundation.org> (raw)
In-Reply-To: <20201219125344.671832095@linuxfoundation.org>

From: Fugang Duan <fugang.duan@nxp.com>

[ Upstream commit 36d18b5664ef617ccf4da266291d2f2342fab89d ]

Start phylink instance and resume back the PHY to supply
RX clock to MAC before MAC layer initialization by calling
.stmmac_hw_setup(), since DMA reset depends on the RX clock,
otherwise DMA reset cost maximum timeout value then finally
timeout.

Fixes: 74371272f97f ("net: stmmac: Convert to phylink and remove phylib logic")
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5170,6 +5170,14 @@ 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);
 
@@ -5188,14 +5196,6 @@ int stmmac_resume(struct device *dev)
 	mutex_unlock(&priv->lock);
 	rtnl_unlock();
 
-	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();
-	}
-
 	phylink_mac_change(priv->phylink, true);
 
 	netif_device_attach(ndev);


