Commit 3c293f4e authored by Andrew Lunn's avatar Andrew Lunn Committed by David S. Miller

net: phy: Trigger state machine on state change and not polling.

The phy_start() is used to indicate the PHY is now ready to do its
work. The state is changed, normally to PHY_UP which means that both
the MAC and the PHY are ready.

If the phy driver is using polling, when the next poll happens, the
state machine notices the PHY is now in PHY_UP, and kicks off
auto-negotiation, if needed.

If however, the PHY is using interrupts, there is no polling. The phy
is stuck in PHY_UP until the next interrupt comes along. And there is
no reason for the PHY to interrupt.

Have phy_start() schedule the state machine to run, which both speeds
up the polling use case, and makes the interrupt use case actually
work.

This problems exists whenever there is a state change which will not
cause an interrupt. Trigger the state machine in these cases,
e.g. phy_error().
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Cc: Kyle Roeschley <kyle.roeschley@ni.com>
Tested-by: default avatarKyle Roeschley <kyle.roeschley@ni.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8ce48623
...@@ -607,6 +607,21 @@ void phy_start_machine(struct phy_device *phydev) ...@@ -607,6 +607,21 @@ void phy_start_machine(struct phy_device *phydev)
queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ); queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
} }
/**
* phy_trigger_machine - trigger the state machine to run
*
* @phydev: the phy_device struct
*
* Description: There has been a change in state which requires that the
* state machine runs.
*/
static void phy_trigger_machine(struct phy_device *phydev)
{
cancel_delayed_work_sync(&phydev->state_queue);
queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
}
/** /**
* phy_stop_machine - stop the PHY state machine tracking * phy_stop_machine - stop the PHY state machine tracking
* @phydev: target phy_device struct * @phydev: target phy_device struct
...@@ -639,6 +654,8 @@ static void phy_error(struct phy_device *phydev) ...@@ -639,6 +654,8 @@ static void phy_error(struct phy_device *phydev)
mutex_lock(&phydev->lock); mutex_lock(&phydev->lock);
phydev->state = PHY_HALTED; phydev->state = PHY_HALTED;
mutex_unlock(&phydev->lock); mutex_unlock(&phydev->lock);
phy_trigger_machine(phydev);
} }
/** /**
...@@ -800,8 +817,7 @@ void phy_change(struct work_struct *work) ...@@ -800,8 +817,7 @@ void phy_change(struct work_struct *work)
} }
/* reschedule state queue work to run as soon as possible */ /* reschedule state queue work to run as soon as possible */
cancel_delayed_work_sync(&phydev->state_queue); phy_trigger_machine(phydev);
queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
return; return;
ignore: ignore:
...@@ -890,6 +906,8 @@ void phy_start(struct phy_device *phydev) ...@@ -890,6 +906,8 @@ void phy_start(struct phy_device *phydev)
/* if phy was suspended, bring the physical link up again */ /* if phy was suspended, bring the physical link up again */
if (do_resume) if (do_resume)
phy_resume(phydev); phy_resume(phydev);
phy_trigger_machine(phydev);
} }
EXPORT_SYMBOL(phy_start); EXPORT_SYMBOL(phy_start);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment