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net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed

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By default, DSA drivers should configure CPU and DSA ports to their
maximum speed. In many configurations this is sufficient to make the
link work.

In some cases it is necessary to configure the link to run slower,
e.g. because of limitations of the SoC it is connected to. Or back to
back PHYs are used and the PHY needs to be driven in order to
establish link. In this case, phylink is used.

Only instantiate phylink if it is required. If there is no PHY, or no
fixed link properties, phylink can upset a link which works in the
default configuration.

Fixes: 0e27921816 ("net: dsa: Use PHYLINK for the CPU/DSA ports")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2020-03-11 16:24:24 +01:00 committed by David S. Miller
parent 46e4c421a0
commit a20f997010
1 changed files with 9 additions and 3 deletions
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12
net/dsa/port.c
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@ -648,9 +648,14 @@ err_phy_connect:
int dsa_port_link_register_of(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
struct device_node *phy_np;
if (!ds->ops->adjust_link)
return dsa_port_phylink_register(dp);
if (!ds->ops->adjust_link) {
phy_np = of_parse_phandle(dp->dn, "phy-handle", 0);
if (of_phy_is_fixed_link(dp->dn) || phy_np)
return dsa_port_phylink_register(dp);
return 0;
}
dev_warn(ds->dev,
"Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
@ -665,11 +670,12 @@ void dsa_port_link_unregister_of(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
if (!ds->ops->adjust_link) {
if (!ds->ops->adjust_link && dp->pl) {
rtnl_lock();
phylink_disconnect_phy(dp->pl);
rtnl_unlock();
phylink_destroy(dp->pl);
dp->pl = NULL;
return;
}