linux-kernel - Re: [PATCH v2 1/3] iio: accel: adxl372: Fix/remove limitation for FIFO samples

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Message-ID: <1568723869.10585.17.camel@analog.com>
Date:   Tue, 17 Sep 2019 12:41:45 +0000
From:   "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>
To:     "jic23@...nel.org" <jic23@...nel.org>
CC:     "knaack.h@....de" <knaack.h@....de>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] iio: accel: adxl372: Fix/remove limitation for
 FIFO samples

On Du, 2019-09-15 at 14:27 +0100, Jonathan Cameron wrote:
> 
> 
> 
> On Tue, 10 Sep 2019 17:43:32 +0300
> Stefan Popa <stefan.popa@...log.com> wrote:
> 
> > 
> > 
> > 
> > 
> > Currently, the driver sets the FIFO_SAMPLES register with the number of
> > sample sets (maximum of 170 for 3 axis data, 256 for 2-axis and 512 for
> > single axis). However, the FIFO_SAMPLES register should store the
> > number
> > of samples, regardless of how the FIFO format is configured.
> > 
> > Signed-off-by: Stefan Popa <stefan.popa@...log.com>
Hi Jonathan,

> 
> 
> 
> Fixes tags? I think it's 
> Fixes: f4f55ce38e5f ("iio:adxl372: Add FIFO and interrupts support")
> 
> Check I got that right though.
Yes, that's right! Thank you!
-Stefan
> 
> 
> 
> 
> One trivial inline that I have tidied up whilst applying.
> 
> Applied to the fixes-togreg branch of iio.git.
> 
> Thanks,
> 
> Jonathan
> 
> 
> > 
> > 
> > 
> > 
> > ---
> > Changes in v2:
> > 	- st->watermark needs to store the number of sample sets, 
> > 	  the total number of samples is computed in
> > 	  adxl372_configure_fifo() func.
> > 
> >  drivers/iio/accel/adxl372.c | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
> > index 055227cb..7de5e1b 100644
> > --- a/drivers/iio/accel/adxl372.c
> > +++ b/drivers/iio/accel/adxl372.c
> > @@ -474,12 +474,17 @@ static int adxl372_configure_fifo(struct
> > adxl372_state *st)
> >  	if (ret < 0)
> >  		return ret;
> >  
> > -	fifo_samples = st->watermark & 0xFF;
> > +	/*
> > +	 * watermak stores the number of sets; we need to write the
> > FIFO
> watermark
> 
> > 
> > 
> > 
> > 
> > +	 * registers with the number of samples
> > +	 */
> > +	fifo_samples = (st->watermark * st->fifo_set_size);
> >  	fifo_ctl = ADXL372_FIFO_CTL_FORMAT_MODE(st->fifo_format) |
> >  		   ADXL372_FIFO_CTL_MODE_MODE(st->fifo_mode) |
> > -		   ADXL372_FIFO_CTL_SAMPLES_MODE(st->watermark);
> > +		   ADXL372_FIFO_CTL_SAMPLES_MODE(fifo_samples);
> >  
> > -	ret = regmap_write(st->regmap, ADXL372_FIFO_SAMPLES,
> > fifo_samples);
> > +	ret = regmap_write(st->regmap,
> > +			   ADXL372_FIFO_SAMPLES, fifo_samples & 0xFF);
> >  	if (ret < 0)
> >  		return ret;
> >