[PATCH 4.18 045/135] net: phy: phylink: fix SFP interface autodetection

Greg Kroah-Hartman
2018-10-16T17:14:01Z

From: Baruch Siach <baruch@tkos.co.il>

[ Upstream commit 7e4183752735deb7543e179a44f4f4b44917cd6f ]

When connecting SFP PHY to phylink use the detected interface.
Otherwise, the link fails to come up when the configured 'phy-mode'
differs from the SFP detected mode.

Move most of phylink_connect_phy() into __phylink_connect_phy(), and
leave phylink_connect_phy() as a wrapper. phylink_sfp_connect_phy() can
now pass the SFP detected PHY interface to __phylink_connect_phy().

This fixes 1GB SFP module link up on eth3 of the Macchiatobin board that
is configured in the DT to "2500base-x" phy-mode.

Fixes: 9525ae83959b6 ("phylink: add phylink infrastructure")
Suggested-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/phy/phylink.c | 48 ++++++++++++++++++++++++++--------------------
1 file changed, 28 insertions(+), 20 deletions(-)

--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -717,6 +717,30 @@ static int phylink_bringup_phy(struct ph
return 0;
}

+static int __phylink_connect_phy(struct phylink *pl, struct phy_device *phy,
+ phy_interface_t interface)
+{
+ int ret;
+
+ if (WARN_ON(pl->link_an_mode == MLO_AN_FIXED ||
+ (pl->link_an_mode == MLO_AN_INBAND &&
+ phy_interface_mode_is_8023z(interface))))
+ return -EINVAL;
+
+ if (pl->phydev)
+ return -EBUSY;
+
+ ret = phy_attach_direct(pl->netdev, phy, 0, interface);
+ if (ret)
+ return ret;
+
+ ret = phylink_bringup_phy(pl, phy);
+ if (ret)
+ phy_detach(phy);
+
+ return ret;
+}
+
/**
* phylink_connect_phy() - connect a PHY to the phylink instance
* @pl: a pointer to a &struct phylink returned from phylink_create()
@@ -734,31 +758,13 @@ static int phylink_bringup_phy(struct ph
*/
int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
{
- int ret;
-
- if (WARN_ON(pl->link_an_mode == MLO_AN_FIXED ||
- (pl->link_an_mode == MLO_AN_INBAND &&
- phy_interface_mode_is_8023z(pl->link_interface))))
- return -EINVAL;
-
- if (pl->phydev)
- return -EBUSY;
-
/* Use PHY device/driver interface */
if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
pl->link_interface = phy->interface;
pl->link_config.interface = pl->link_interface;
}

- ret = phy_attach_direct(pl->netdev, phy, 0, pl->link_interface);
- if (ret)
- return ret;
-
- ret = phylink_bringup_phy(pl, phy);
- if (ret)
- phy_detach(phy);
-
- return ret;
+ return __phylink_connect_phy(pl, phy, pl->link_interface);
}
EXPORT_SYMBOL_GPL(phylink_connect_phy);

@@ -1672,7 +1678,9 @@ static void phylink_sfp_link_up(void *up

static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
{
- return phylink_connect_phy(upstream, phy);
+ struct phylink *pl = upstream;
+
+ return __phylink_connect_phy(upstream, phy, pl->link_config.interface);
}

static void phylink_sfp_disconnect_phy(void *upstream)