[PATCH 4.19 24/72] netsec: restore phy power state after controller reset

From: Greg Kroah-Hartman
Date: Mon Mar 29 2021 - 04:13:32 EST


From: Mian Yousaf Kaukab <ykaukab@xxxxxxx>

commit 804741ac7b9f2fdebe3740cb0579cb8d94d49e60 upstream.

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@xxxxxxxxxxxxxxx
Signed-off-by: Mian Yousaf Kaukab <ykaukab@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/socionext/netsec.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/socionext/netsec.c
+++ b/drivers/net/ethernet/socionext/netsec.c
@@ -1386,14 +1386,17 @@ static int netsec_netdev_init(struct net
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);
+
return 0;
err2:
netsec_free_dring(priv, NETSEC_RING_RX);