netdev - [PATCH net] netsec: restore phy power state after controller reset

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Date:   Thu, 18 Mar 2021 09:50:26 +0100
From:   Mian Yousaf Kaukab <ykaukab@...e.de>
To:     jaswinder.singh@...aro.org, ilias.apalodimas@...aro.org,
        davem@...emloft.net, kuba@...nel.org, masahisa.kojima@...aro.org,
        osaki.yoshitoyo@...ionext.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mian Yousaf Kaukab <ykaukab@...e.de>, stable@...r.kernel.org
Subject: [PATCH net] netsec: restore phy power state after controller reset

Since commit 8e850f25b581 ("net: socionext: Stop PHY before resetting
netsec") netsec_netdev_init() power downs phy before resetting the
controller. However, the state is not restored once the reset is
complete. As a result it is not possible to bring up network on a
platform with Broadcom BCM5482 phy.

Fix the issue by restoring phy power state after controller reset is
complete.

Fixes: 8e850f25b581 ("net: socionext: Stop PHY before resetting netsec")
Cc: stable@...r.kernel.org
Signed-off-by: Mian Yousaf Kaukab <ykaukab@...e.de>
---
 drivers/net/ethernet/socionext/netsec.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/socionext/netsec.c b/drivers/net/ethernet/socionext/netsec.c
index 3c53051bdacf..200785e703c8 100644
--- a/drivers/net/ethernet/socionext/netsec.c
+++ b/drivers/net/ethernet/socionext/netsec.c
@@ -1715,14 +1715,17 @@ static int netsec_netdev_init(struct net_device *ndev)
 		goto err1;
 
 	/* set phy power down */
-	data = netsec_phy_read(priv->mii_bus, priv->phy_addr, MII_BMCR) |
-		BMCR_PDOWN;
-	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR, data);
+	data = netsec_phy_read(priv->mii_bus, priv->phy_addr, MII_BMCR);
+	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR,
+			 data | BMCR_PDOWN);
 
 	ret = netsec_reset_hardware(priv, true);
 	if (ret)
 		goto err2;
 
+	/* Restore phy power state */
+	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR, data);
+
 	spin_lock_init(&priv->desc_ring[NETSEC_RING_TX].lock);
 	spin_lock_init(&priv->desc_ring[NETSEC_RING_RX].lock);
 
-- 
2.26.2