patch "iio: accel: adxl372: Fix/remove limitation for FIFO samples" added to staging-linus

This is a note to let you know that I've just added the patch titled

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

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From d202ce4787e446556c6b9d01f84734c3f8174ba3 Mon Sep 17 00:00:00 2001
From: Stefan Popa <[email protected]>
Date: Tue, 10 Sep 2019 17:43:32 +0300
Subject: 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.

---
 drivers/iio/accel/adxl372.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

index 055227cb3d43..863fe61a371f 100644
@@ -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;
 

2.23.0