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

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Date:   Sun, 15 Sep 2019 14:27:05 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Stefan Popa <stefan.popa@...log.com>
Cc:     <Michael.Hennerich@...log.com>, <knaack.h@....de>,
        <lars@...afoo.de>, <pmeerw@...erw.net>,
        <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] iio: accel: adxl372: Fix/remove limitation for
 FIFO samples

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>

Fixes tags? I think it's 
Fixes: f4f55ce38e5f ("iio:adxl372: Add FIFO and interrupts support")

Check I got that right though.

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;
>