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net: macb: poll for fixed link state in SGMII mode 

When using a fixed-link configuration with GEM in SGMII mode, such as
for a chip-to-chip interconnect, the link state was always showing as
established regardless of the actual connectivity state. We can monitor
the pcs_link_state bit in the Network Status register to determine
whether the PCS link state is actually up.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Hancock 2021-03-11 14:18:12 -06:00 committed by David S. Miller
parent c232f81b0a
commit 8fab174b78
1 changed files with 14 additions and 0 deletions
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14
drivers/net/ethernet/cadence/macb_main.c
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@ -847,6 +847,15 @@ static int macb_phylink_connect(struct macb *bp)
return 0;
}
static void macb_get_pcs_fixed_state(struct phylink_config *config,
struct phylink_link_state *state)
{
struct net_device *ndev = to_net_dev(config->dev);
struct macb *bp = netdev_priv(ndev);
state->link = (macb_readl(bp, NSR) & MACB_BIT(NSR_LINK)) != 0;
}
/* based on au1000_eth. c*/
static int macb_mii_probe(struct net_device *dev)
{
@ -855,6 +864,11 @@ static int macb_mii_probe(struct net_device *dev)
bp->phylink_config.dev = &dev->dev;
bp->phylink_config.type = PHYLINK_NETDEV;
if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
bp->phylink_config.poll_fixed_state = true;
bp->phylink_config.get_fixed_state = macb_get_pcs_fixed_state;
}
bp->phylink = phylink_create(&bp->phylink_config, bp->pdev->dev.fwnode,
bp->phy_interface, &macb_phylink_ops);
if (IS_ERR(bp->phylink)) {