iio: accel: adxl372: Fix/remove limitation for FIFO samples

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>
Fixes: f4f55ce38e5f ("iio:adxl372: Add FIFO and interrupts support")
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
index 055227cb3d43..863fe61a371f 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;
+        /*
+         * watermark stores the number of sets; we need to write the FIFO
+         * 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;