[PATCH 4.19 36/72] net: ks8851: Set initial carrier state to down

From: Greg Kroah-Hartman
Date: Thu May 02 2019 - 11:27:12 EST

[ Upstream commit 9624bafa5f6418b9ca5b3f66d1f6a6a2e8bf6d4c ]

The ks8851 chip's initial carrier state is down. A Link Change Interrupt
is signaled once interrupts are enabled if the carrier is up.

The ks8851 driver has it backwards by assuming that the initial carrier
state is up. The state is therefore misrepresented if the interface is
opened with no cable attached. Fix it.

The Link Change interrupt is sometimes not signaled unless the P1MBSR
register (which contains the Link Status bit) is read on ->ndo_open().
This might be a hardware erratum. Read the register by calling
mii_check_link(), which has the desirable side effect of setting the
carrier state to down if the cable was detached while the interface was

Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Cc: Frank Pavlic <f.pavlic@xxxxxxxxx>
Cc: Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx>
Cc: Tristram Ha <Tristram.Ha@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin (Microsoft) <sashal@xxxxxxxxxx>
drivers/net/ethernet/micrel/ks8851.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index c9faec4c5b25..b83b070a9eec 100644
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -858,6 +858,7 @@ static int ks8851_net_open(struct net_device *dev)
netif_dbg(ks, ifup, ks->netdev, "network device up\n");

+ mii_check_link(&ks->mii);
return 0;

@@ -1519,6 +1520,7 @@ static int ks8851_probe(struct spi_device *spi)

spi_set_drvdata(spi, ks);

+ netif_carrier_off(ks->netdev);
ndev->if_port = IF_PORT_100BASET;
ndev->netdev_ops = &ks8851_netdev_ops;
ndev->irq = spi->irq;