linux-kernel - Re: [PATCH v2] counter: microchip-tcb-capture: Fix CMR value check

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Message-ID: <20201121163157.086ae03b@archlinux>
Date:   Sat, 21 Nov 2020 16:31:57 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Kamel Bouhara <kamel.bouhara@...tlin.com>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        robh+dt@...nel.org, alexandre.belloni@...tlin.com,
        linux-arm-kernel@...ts.infradead.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] counter: microchip-tcb-capture: Fix CMR value check

On Sun, 15 Nov 2020 16:26:17 +0100
Kamel Bouhara <kamel.bouhara@...tlin.com> wrote:

> On Sat, Nov 14, 2020 at 06:28:05PM -0500, William Breathitt Gray wrote:
> > The ATMEL_TC_ETRGEDG_* defines are not masks but rather possible values
> > for CMR. This patch fixes the action_get() callback to properly check
> > for these values rather than mask them.
> >
> > Fixes: 106b104137fd ("counter: Add microchip TCB capture counter")
> > Cc: Kamel Bouhara <kamel.bouhara@...tlin.com>
> > Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> > ---  
> 
> Acked-by: Kamel Bouhara <kamel.bouhara@...tlin.com>
> 
Applied to the fixes-togreg branch of iio.git and marked for stable.

Thanks,

Jonathan

> >  drivers/counter/microchip-tcb-capture.c | 16 ++++++++++------
> >  1 file changed, 10 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c
> > index 039c54a78aa5..710acc0a3704 100644
> > --- a/drivers/counter/microchip-tcb-capture.c
> > +++ b/drivers/counter/microchip-tcb-capture.c
> > @@ -183,16 +183,20 @@ static int mchp_tc_count_action_get(struct counter_device *counter,
> >
> >  	regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr);
> >
> > -	*action = MCHP_TC_SYNAPSE_ACTION_NONE;
> > -
> > -	if (cmr & ATMEL_TC_ETRGEDG_NONE)
> > +	switch (cmr & ATMEL_TC_ETRGEDG) {
> > +	default:
> >  		*action = MCHP_TC_SYNAPSE_ACTION_NONE;
> > -	else if (cmr & ATMEL_TC_ETRGEDG_RISING)
> > +		break;
> > +	case ATMEL_TC_ETRGEDG_RISING:
> >  		*action = MCHP_TC_SYNAPSE_ACTION_RISING_EDGE;
> > -	else if (cmr & ATMEL_TC_ETRGEDG_FALLING)
> > +		break;
> > +	case ATMEL_TC_ETRGEDG_FALLING:
> >  		*action = MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE;
> > -	else if (cmr & ATMEL_TC_ETRGEDG_BOTH)
> > +		break;
> > +	case ATMEL_TC_ETRGEDG_BOTH:
> >  		*action = MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE;
> > +		break;
> > +	}
> >
> >  	return 0;
> >  }
> > --
> > 2.29.2
> >  
> 
> --
> Kamel Bouhara, Bootlin
> Embedded Linux and kernel engineering
> https://bootlin.com