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net: phy: Add state machine state transitions debug prints

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It can be useful to debug the PHY state machine, add dynamic debug
prints of the old and new PHY devices state under a friendly format.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2015-05-16 10:17:56 -07:00 committed by David S. Miller
parent 4133fc0952
commit 3e2186e021
1 changed files with 31 additions and 0 deletions
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31
drivers/net/phy/phy.c
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@ -58,6 +58,31 @@ static const char *phy_speed_to_str(int speed)
}
}
#define PHY_STATE_STR(_state) \
case PHY_##_state: \
return __stringify(_state); \
static const char *phy_state_to_str(enum phy_state st)
{
switch (st) {
PHY_STATE_STR(DOWN)
PHY_STATE_STR(STARTING)
PHY_STATE_STR(READY)
PHY_STATE_STR(PENDING)
PHY_STATE_STR(UP)
PHY_STATE_STR(AN)
PHY_STATE_STR(RUNNING)
PHY_STATE_STR(NOLINK)
PHY_STATE_STR(FORCING)
PHY_STATE_STR(CHANGELINK)
PHY_STATE_STR(HALTED)
PHY_STATE_STR(RESUMING)
}
return NULL;
}
/**
* phy_print_status - Convenience function to print out the current phy status
* @phydev: the phy_device struct
@ -770,10 +795,13 @@ void phy_state_machine(struct work_struct *work)
struct phy_device *phydev =
container_of(dwork, struct phy_device, state_queue);
bool needs_aneg = false, do_suspend = false, do_resume = false;
enum phy_state old_state;
int err = 0;
mutex_lock(&phydev->lock);
old_state = phydev->state;
if (phydev->drv->link_change_notify)
phydev->drv->link_change_notify(phydev);
@ -949,6 +977,9 @@ void phy_state_machine(struct work_struct *work)
if (err < 0)
phy_error(phydev);
dev_dbg(&phydev->dev, "PHY state change %s -> %s\n",
phy_state_to_str(old_state), phy_state_to_str(phydev->state));
queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
PHY_STATE_TIME * HZ);
}