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Message-ID: <20230328120604.zawfeskqs4yhlze6@kandell> Date: Tue, 28 Mar 2023 14:06:04 +0200 From: Marek BehĂșn <marek.behun@....cz> To: Gustav Ekelund <gustav.ekelund@...s.com> Cc: Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, kernel@...s.com, Gustav Ekelund <gustaek@...s.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net] net: dsa: mv88e6xxx: Reset mv88e6393x watchdog register On Tue, Mar 28, 2023 at 01:55:11PM +0200, Gustav Ekelund wrote: > From: Gustav Ekelund <gustaek@...s.com> > > The watchdog event bits are not cleared during SW reset in the mv88e6393x > switch. This causes one event to be handled over and over again. > > Explicitly clear the watchdog event register to 0 after the SW reset. > > Signed-off-by: Gustav Ekelund <gustaek@...s.com> > --- > drivers/net/dsa/mv88e6xxx/chip.c | 2 +- > drivers/net/dsa/mv88e6xxx/global2.c | 17 +++++++++++++++++ > drivers/net/dsa/mv88e6xxx/global2.h | 1 + > 3 files changed, 19 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c > index 30383c4f8fd0..ee22d4785e9e 100644 > --- a/drivers/net/dsa/mv88e6xxx/chip.c > +++ b/drivers/net/dsa/mv88e6xxx/chip.c > @@ -5596,7 +5596,7 @@ 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 ed3b2f88e783..bef8297d4f78 100644 > --- a/drivers/net/dsa/mv88e6xxx/global2.c > +++ b/drivers/net/dsa/mv88e6xxx/global2.c > @@ -943,6 +943,23 @@ 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); > + > + mv88e6xxx_g2_write(chip, MV88E6390_G2_WDOG_CTL, > + MV88E6390_G2_WDOG_CTL_UPDATE | > + MV88E6390_G2_WDOG_CTL_PTR_EVENT); > + > + return IRQ_HANDLED; > +} Shouldn't this update be in .irq_setup() method? In the commit message you're saying that the problem is that bits aren't cleared with SW reset. So I would guess that the change should be in the setup of watchdog IRQ, not in IRQ action? (I am not disagreeing, I am just asking because I don't have access to documentation right now.) Marek > +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 e973114d6890..7e091965582b 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; > -- > 2.30.2 >
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