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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2017-12-12 10:45:36 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-12-13 15:00:10 -0500 |
| commit | f5e64032a799d4f54decc7eb6aafcdffb67f9ad9 (patch) | |
| tree | c3bac205223f88e42ad6c7e0f5fbde9c6ca1a553 /drivers/net/phy/phy.c | |
| parent | cd8165c3d5fb07667328434835f2968a87caee67 (diff) | |
| download | talos-obmc-linux-f5e64032a799d4f54decc7eb6aafcdffb67f9ad9.tar.gz talos-obmc-linux-f5e64032a799d4f54decc7eb6aafcdffb67f9ad9.zip | |
net: phy: fix resume handling
When a PHY has the BMCR_PDOWN bit set, it may decide to ignore writes
to other registers, or reset the registers to power-on defaults.
Micrel PHYs do this for their interrupt registers.
The current structure of phylib tries to enable interrupts before
resuming (and releasing) the BMCR_PDOWN bit. This fails, causing
Micrel PHYs to stop working after a suspend/resume sequence if they
are using interrupts.
Fix this by ensuring that the PHY driver resume methods do not take
the phydev->lock mutex themselves, but the callers of phy_resume()
take that lock. This then allows us to move the call to phy_resume()
before we enable interrupts in phy_start().
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/phy.c')
| -rw-r--r-- | drivers/net/phy/phy.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 2b1e67bc1e73..ed10d1fc8f59 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -828,7 +828,6 @@ EXPORT_SYMBOL(phy_stop); */ void phy_start(struct phy_device *phydev) { - bool do_resume = false; int err = 0; mutex_lock(&phydev->lock); @@ -841,6 +840,9 @@ void phy_start(struct phy_device *phydev) phydev->state = PHY_UP; break; case PHY_HALTED: + /* if phy was suspended, bring the physical link up again */ + phy_resume(phydev); + /* make sure interrupts are re-enabled for the PHY */ if (phydev->irq != PHY_POLL) { err = phy_enable_interrupts(phydev); @@ -849,17 +851,12 @@ void phy_start(struct phy_device *phydev) } phydev->state = PHY_RESUMING; - do_resume = true; break; default: break; } mutex_unlock(&phydev->lock); - /* if phy was suspended, bring the physical link up again */ - if (do_resume) - phy_resume(phydev); - phy_trigger_machine(phydev, true); } EXPORT_SYMBOL(phy_start); |
