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

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

[Mian Yousaf Kaukab]

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@vger.kernel.org
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.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

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

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Thu, 18 Mar 2021 09:50:26 +0100 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [net] netsec: restore phy power state after controller reset
    https://git.kernel.org/netdev/net/c/804741ac7b9f

You are awesome, thank you!
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