[PATCH net-next 3/9] net: phy: phylink: Poll link GPIOs

[Florian Fainelli]

From: Russell King <rmk+ker...@armlinux.org.uk>

When using a fixed link with a link GPIO, we need to poll that GPIO to
determine link state changes. This is consistent with what fixed_phy.c does.

Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
 drivers/net/phy/phylink.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 6392b5248cf5..581ce93ecaf9 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -19,6 +19,7 @@
 #include <linux/phylink.h>
 #include <linux/rtnetlink.h>
 #include <linux/spinlock.h>
+#include <linux/timer.h>
 #include <linux/workqueue.h>
 
 #include "sfp.h"
@@ -54,6 +55,7 @@ struct phylink {
        /* The link configuration settings */
        struct phylink_link_state link_config;
        struct gpio_desc *link_gpio;
+       struct timer_list link_poll;
        void (*get_fixed_state)(struct net_device *dev,
                                struct phylink_link_state *s);
 
@@ -500,6 +502,15 @@ static void phylink_run_resolve(struct phylink *pl)
                queue_work(system_power_efficient_wq, &pl->resolve);
 }
 
+static void phylink_fixed_poll(struct timer_list *t)
+{
+       struct phylink *pl = container_of(t, struct phylink, link_poll);
+
+       mod_timer(t, jiffies + HZ);
+
+       phylink_run_resolve(pl);
+}
+
 static const struct sfp_upstream_ops sfp_phylink_ops;
 
 static int phylink_register_sfp(struct phylink *pl,
@@ -572,6 +583,7 @@ struct phylink *phylink_create(struct net_device *ndev,
        pl->link_config.an_enabled = true;
        pl->ops = ops;
        __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
+       timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 
        bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
        linkmode_copy(pl->link_config.advertising, pl->supported);
@@ -905,6 +917,8 @@ void phylink_start(struct phylink *pl)
        clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
        phylink_run_resolve(pl);
 
+       if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
+               mod_timer(&pl->link_poll, jiffies + HZ);
        if (pl->sfp_bus)
                sfp_upstream_start(pl->sfp_bus);
        if (pl->phydev)
@@ -929,6 +943,8 @@ void phylink_stop(struct phylink *pl)
                phy_stop(pl->phydev);
        if (pl->sfp_bus)
                sfp_upstream_stop(pl->sfp_bus);
+       if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
+               del_timer_sync(&pl->link_poll);
 
        set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
        queue_work(system_power_efficient_wq, &pl->resolve);
-- 
2.17.0