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net: stmmac: Speed down the PHY if WoL to save energy

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When WoL is enabled and the machine is powered off, the PHY remains
waiting for wakeup events at max speed, which is a waste of energy.

Slow down the PHY speed before stopping the ethernet if WoL is enabled,

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jisheng Zhang 2020-07-27 19:05:20 +08:00 • committed by David S. Miller
parent 1d8e5b0f3f
commit 77b2898394
1 changed files with 8 additions and 0 deletions
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8
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -2823,6 +2823,8 @@ static int stmmac_open(struct net_device *dev)
stmmac_init_coalesce(priv);
phylink_start(priv->phylink);
/* We may have called phylink_speed_down before */
phylink_speed_up(priv->phylink);
/* Request the IRQ lines */
ret = request_irq(dev->irq, stmmac_interrupt,
@ -2896,6 +2898,8 @@ static int stmmac_release(struct net_device *dev)
if (priv->eee_enabled)
del_timer_sync(&priv->eee_ctrl_timer);
if (device_may_wakeup(priv->device))
phylink_speed_down(priv->phylink, false);
/* Stop and disconnect the PHY */
phylink_stop(priv->phylink);
phylink_disconnect_phy(priv->phylink);
@ -5095,6 +5099,8 @@ int stmmac_suspend(struct device *dev)
} else {
mutex_unlock(&priv->lock);
rtnl_lock();
if (device_may_wakeup(priv->device))
phylink_speed_down(priv->phylink, false);
phylink_stop(priv->phylink);
rtnl_unlock();
mutex_lock(&priv->lock);
@ -5207,6 +5213,8 @@ int stmmac_resume(struct device *dev)
if (!device_may_wakeup(priv->device) || !priv->plat->pmt) {
rtnl_lock();
phylink_start(priv->phylink);
/* We may have called phylink_speed_down before */
phylink_speed_up(priv->phylink);
rtnl_unlock();
}