shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-05 10:31:46 +09:00
Code Issues Packages Projects Releases Wiki Activity

net: ks8851: Set initial carrier state to down

Browse Source 
[ Upstream commit 9624bafa5f ]

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
closed.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
This commit is contained in:
Lukas Wunner
2019-03-20 15:02:00 +01:00
committed by Greg Kroah-Hartman
parent 64e8347986
commit b6ca8ec8bb
1 changed files with 2 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/micrel/ks8851.c
View File

@@ -849,6 +849,7 @@ static int ks8851_net_open(struct net_device *dev)
netif_dbg(ks, ifup, ks->netdev, "network device up\n");
mutex_unlock(&ks->lock);
mii_check_link(&ks->mii);
return 0;
}
@@ -1510,6 +1511,7 @@ 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;