From 089b91a0155c4de1209a07ff2a7dd299ff3ece47 Mon Sep 17 00:00:00 2001 From: Gustav Ekelund Date: Fri, 31 Mar 2023 10:40:13 +0200 Subject: [PATCH] net: dsa: mv88e6xxx: Reset mv88e6393x force WD event bit The force watchdog event bit is not cleared during SW reset in the mv88e6393x switch. This is a different behavior compared to mv886390 which clears the force WD event bit as advertised. This causes a force WD event to be handled over and over again as the SW reset following the event never clears the force WD event bit. Explicitly clear the watchdog event register to 0 in irq_action when handling an event to prevent the switch from sending continuous interrupts. Marvell aren't aware of any other stuck bits apart from the force WD bit. Fixes: de776d0d316f ("net: dsa: mv88e6xxx: add support for mv88e6393x family" Signed-off-by: Gustav Ekelund Reviewed-by: Andrew Lunn Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/dsa/mv88e6xxx/chip.c | 2 +- drivers/net/dsa/mv88e6xxx/global2.c | 20 ++++++++++++++++++++ drivers/net/dsa/mv88e6xxx/global2.h | 1 + 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index 0de7b36..7108f74 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -5601,7 +5601,7 @@ static const struct mv88e6xxx_ops mv88e6393x_ops = { * .port_set_upstream_port method. */ .set_egress_port = mv88e6393x_set_egress_port, - .watchdog_ops = &mv88e6390_watchdog_ops, + .watchdog_ops = &mv88e6393x_watchdog_ops, .mgmt_rsvd2cpu = mv88e6393x_port_mgmt_rsvd2cpu, .pot_clear = mv88e6xxx_g2_pot_clear, .reset = mv88e6352_g1_reset, diff --git a/drivers/net/dsa/mv88e6xxx/global2.c b/drivers/net/dsa/mv88e6xxx/global2.c index ed3b2f8..a7af3ce 100644 --- a/drivers/net/dsa/mv88e6xxx/global2.c +++ b/drivers/net/dsa/mv88e6xxx/global2.c @@ -943,6 +943,26 @@ const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops = { .irq_free = mv88e6390_watchdog_free, }; +static int mv88e6393x_watchdog_action(struct mv88e6xxx_chip *chip, int irq) +{ + mv88e6390_watchdog_action(chip, irq); + + /* Fix for clearing the force WD event bit. + * Unreleased erratum on mv88e6393x. + */ + mv88e6xxx_g2_write(chip, MV88E6390_G2_WDOG_CTL, + MV88E6390_G2_WDOG_CTL_UPDATE | + MV88E6390_G2_WDOG_CTL_PTR_EVENT); + + return IRQ_HANDLED; +} + +const struct mv88e6xxx_irq_ops mv88e6393x_watchdog_ops = { + .irq_action = mv88e6393x_watchdog_action, + .irq_setup = mv88e6390_watchdog_setup, + .irq_free = mv88e6390_watchdog_free, +}; + static irqreturn_t mv88e6xxx_g2_watchdog_thread_fn(int irq, void *dev_id) { struct mv88e6xxx_chip *chip = dev_id; diff --git a/drivers/net/dsa/mv88e6xxx/global2.h b/drivers/net/dsa/mv88e6xxx/global2.h index e973114..7e09196 100644 --- a/drivers/net/dsa/mv88e6xxx/global2.h +++ b/drivers/net/dsa/mv88e6xxx/global2.h @@ -369,6 +369,7 @@ int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target, extern const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops; extern const struct mv88e6xxx_irq_ops mv88e6250_watchdog_ops; extern const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops; +extern const struct mv88e6xxx_irq_ops mv88e6393x_watchdog_ops; extern const struct mv88e6xxx_avb_ops mv88e6165_avb_ops; extern const struct mv88e6xxx_avb_ops mv88e6352_avb_ops; -- 2.7.4