From d5c3d84657db57bd23ecd58b97f1c99dd42a7b80 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Mon, 18 Jan 2016 19:33:06 -0800 Subject: [PATCH 1/3] net: phy: Avoid polling PHY with PHY_IGNORE_INTERRUPTS Commit 2c7b49212a86 ("phy: fix the use of PHY_IGNORE_INTERRUPT") changed a hunk in phy_state_machine() in the PHY_RUNNING case which was not needed. The change essentially makes the PHY library treat PHY devices with PHY_IGNORE_INTERRUPT to keep polling for the PHY device, even though the intent is not to do it. Fix this by reverting that specific hunk, which makes the PHY state machine wait for state changes, and stay in the PHY_RUNNING state for as long as needed. Fixes: 2c7b49212a86 ("phy: fix the use of PHY_IGNORE_INTERRUPT") Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/phy/phy.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 8763bb20988a..42b4c1eb7a90 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -905,10 +905,10 @@ void phy_state_machine(struct work_struct *work) phydev->adjust_link(phydev->attached_dev); break; case PHY_RUNNING: - /* Only register a CHANGE if we are polling or ignoring - * interrupts and link changed since latest checking. + /* Only register a CHANGE if we are polling and link changed + * since latest checking. */ - if (!phy_interrupt_is_valid(phydev)) { + if (phydev->irq == PHY_POLL) { old_link = phydev->link; err = phy_read_status(phydev); if (err) @@ -1000,8 +1000,13 @@ void phy_state_machine(struct work_struct *work) 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); + /* Only re-schedule a PHY state machine change if we are polling the + * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving + * between states from phy_mac_interrupt() + */ + if (phydev->irq == PHY_POLL) + queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, + PHY_STATE_TIME * HZ); } void phy_mac_interrupt(struct phy_device *phydev, int new_link) From deccd16f91f930af8e91ffbbfc839d0ad8da999d Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Mon, 18 Jan 2016 19:33:07 -0800 Subject: [PATCH 2/3] net: phy: Fix phy_mac_interrupt() Commit 5ea94e7686a3 ("phy: add phy_mac_interrupt()") to use with PHY_IGNORE_INTERRUPT added a cancel_work_sync() into phy_mac_interrupt() which is allowed to sleep, whereas phy_mac_interrupt() is expected to be callable from interrupt context. Now that we have fixed how the PHY state machine treats PHY_IGNORE_INTERRUPT with respect to state changes, we can just set the new link state, and queue the PHY state machine for execution so it is going to read the new link state. For that to work properly, we need to update phy_change() not to try to invoke any interrupt callbacks if we have configured the PHY device for PHY_IGNORE_INTERRUPT, because that PHY device and its driver are not required to implement those. Fixes: 5ea94e7686a3 ("phy: add phy_mac_interrupt() to use with PHY_IGNORE_INTERRUPT") Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/phy/phy.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 42b4c1eb7a90..5590b9c182c9 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -692,25 +692,29 @@ void phy_change(struct work_struct *work) struct phy_device *phydev = container_of(work, struct phy_device, phy_queue); - if (phydev->drv->did_interrupt && - !phydev->drv->did_interrupt(phydev)) - goto ignore; + if (phy_interrupt_is_valid(phydev)) { + if (phydev->drv->did_interrupt && + !phydev->drv->did_interrupt(phydev)) + goto ignore; - if (phy_disable_interrupts(phydev)) - goto phy_err; + if (phy_disable_interrupts(phydev)) + goto phy_err; + } mutex_lock(&phydev->lock); if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) phydev->state = PHY_CHANGELINK; mutex_unlock(&phydev->lock); - atomic_dec(&phydev->irq_disable); - enable_irq(phydev->irq); + if (phy_interrupt_is_valid(phydev)) { + atomic_dec(&phydev->irq_disable); + enable_irq(phydev->irq); - /* Reenable interrupts */ - if (PHY_HALTED != phydev->state && - phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED)) - goto irq_enable_err; + /* Reenable interrupts */ + if (PHY_HALTED != phydev->state && + phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED)) + goto irq_enable_err; + } /* reschedule state queue work to run as soon as possible */ cancel_delayed_work_sync(&phydev->state_queue); @@ -1011,9 +1015,10 @@ void phy_state_machine(struct work_struct *work) void phy_mac_interrupt(struct phy_device *phydev, int new_link) { - cancel_work_sync(&phydev->phy_queue); phydev->link = new_link; - schedule_work(&phydev->phy_queue); + + /* Trigger a state machine change */ + queue_work(system_power_efficient_wq, &phydev->phy_queue); } EXPORT_SYMBOL(phy_mac_interrupt); From 49f7a471e4d172fc80140beccf6b3409b117b130 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Mon, 18 Jan 2016 19:33:08 -0800 Subject: [PATCH 3/3] net: bcmgenet: Properly configure PHY to ignore interrupt By the time we execute bcmgenet_mii_probe(), the MDIO bus structure has long been allocated and registered. Overirring the PHY interrupt using the MDIO bus structure has no chance to work anymore, because of_mdiobus_register() has call phy_device_create() for use, which copied the MDIO bus address's irq for the PHY into the PHY device "irq" member. Since we do have a proper reference to a PHY device in bcmgenet_mii_probe(), just assign the desired IRQ value here. Fixes: aa09677cba42 ("net: bcmgenet: add MDIO routines") Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c index 0d775964b060..457c3bc8cfff 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -401,7 +401,7 @@ int bcmgenet_mii_probe(struct net_device *dev) * Ethernet MAC ISRs */ if (priv->internal_phy) - priv->mii_bus->irq[phydev->mdio.addr] = PHY_IGNORE_INTERRUPT; + priv->phydev->irq = PHY_IGNORE_INTERRUPT; return 0; }