linux-kernel - Re: [PATCH v2 1/2] power: supply: max17042_battery: Clear status bits in interrupt handler

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Message-ID: <20211012160135.ldmhwkpmijkziuob@earth.universe>
Date:   Tue, 12 Oct 2021 18:01:35 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Dirk Brandewie <dirk.brandewie@...il.com>, kernel@...i.sm,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] power: supply: max17042_battery: Clear status
 bits in interrupt handler

Hi,

On Mon, Oct 11, 2021 at 05:32:30AM +0200, Sebastian Krzyszkowiak wrote:
> On wtorek, 14 września 2021 14:18:05 CEST Sebastian Krzyszkowiak wrote:
> > The gauge requires us to clear the status bits manually for some alerts
> > to be properly dismissed. Previously the IRQ was configured to react only
> > on falling edge, which wasn't technically correct (the ALRT line is active
> > low), but it had a happy side-effect of preventing interrupt storms
> > on uncleared alerts from happening.
> > 
> > Fixes: 7fbf6b731bca ("power: supply: max17042: Do not enforce (incorrect)
> > interrupt trigger type") Cc: <stable@...r.kernel.org>
> > Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
> > ---
> > v2: added a comment on why it clears all alert bits
> > ---
> >  drivers/power/supply/max17042_battery.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/power/supply/max17042_battery.c
> > b/drivers/power/supply/max17042_battery.c index 8dffae76b6a3..da78ffe6a3ec
> > 100644
> > --- a/drivers/power/supply/max17042_battery.c
> > +++ b/drivers/power/supply/max17042_battery.c
> > @@ -876,6 +876,10 @@ static irqreturn_t max17042_thread_handler(int id, void
> > *dev) max17042_set_soc_threshold(chip, 1);
> >  	}
> > 
> > +	/* we implicitly handle all alerts via power_supply_changed */
> > +	regmap_clear_bits(chip->regmap, MAX17042_STATUS,
> > +			  0xFFFF & ~(STATUS_POR_BIT | 
> STATUS_BST_BIT));
> > +
> >  	power_supply_changed(chip->battery);
> >  	return IRQ_HANDLED;
> >  }
> 
> Ping? Seems this didn't get applied yet.

Thanks, both queued now.

-- Sebastian

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