linux-kernel - Re: [PATCH v2 4/5] hwmon: (ina3221) Make sure data is ready before reading

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Date:   Wed, 24 Oct 2018 10:54:00 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     linux@...ck-us.net
Cc:     jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] hwmon: (ina3221) Make sure data is ready before
 reading

On Wed, Oct 24, 2018 at 09:10:35AM +0000, linux@...ck-us.net wrote:
> > @@ -150,6 +183,12 @@ static int ina3221_read_in(struct device *dev, u32
> > attr, int channel, long *val)
> >  		if (!ina3221_is_enabled(ina, channel))
> >  			return -ENODATA;
> > 
> > +		ret = ina3221_wait_for_data(ina);
> > +		if (ret) {
> > +			dev_err(dev, "Timed out at waiting for CVRF bit\n");
> > +			return ret;
> > +		}
> 
> Thanks for explaining why we can't just blindly wait.
> However, I am concerned about this log message: If something is wrong
> with the chip, this will spam the kernel log. Can you drop the message
> here and below ? After all, the error will be reported to userspace,
> and a kernel log message should not be necessary.

Will do that.

Thanks
Nicolin

> 
> Thanks,
> Guenter
> 
> > +
> >  		ret = ina3221_read_value(ina, reg, &regval);
> >  		if (ret)
> >  			return ret;
> > @@ -189,6 +228,13 @@ static int ina3221_read_curr(struct device *dev,
> > u32 attr,
> >  	case hwmon_curr_input:
> >  		if (!ina3221_is_enabled(ina, channel))
> >  			return -ENODATA;
> > +
> > +		ret = ina3221_wait_for_data(ina);
> > +		if (ret) {
> > +			dev_err(dev, "Timed out at waiting for CVRF bit\n");
> > +			return ret;
> > +		}
> > +
> >  		/* fall through */
> >  	case hwmon_curr_crit:
> >  	case hwmon_curr_max:
> > --
> > 2.17.1
> 
> 
>