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

Popa, Stefan Serban
2019-09-17T12:42:39Z

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@analog.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@analog.com>
Hi Jonathan,

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>
>
> 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
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> 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;
> >