[PATCH] iio: imu: inv_icm42600: fix odr switch when turning buffer off

[PATCH] iio: imu: inv_icm42600: fix odr switch when turning buffer off

[Jean-Baptiste Maneyrol via B4 Relay]

From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

ODR switch is done in 2 steps when FIFO is on : change the ODR register
value and acknowledge change when reading the FIFO ODR change flag.
When we are switching odr and turning buffer off just afterward, we are
losing the FIFO ODR change flag and ODR switch is blocked.

Fix the issue by force applying any waiting ODR change when turning
buffer off.

Fixes: ec74ae9fd37c ("iio: imu: inv_icm42600: add accurate timestamping")
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Cc: stable@vger.kernel.org
---
 drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
index ada968be954d480a2022bc8aa6918f32e5e543f7..68a395758031884792781d6eee748d273a86a22e 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
@@ -371,6 +371,8 @@ static int inv_icm42600_buffer_predisable(struct iio_dev *indio_dev)
 static int inv_icm42600_buffer_postdisable(struct iio_dev *indio_dev)
 {
 	struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
+	struct inv_icm42600_sensor_state *sensor_st = iio_priv(indio_dev);
+	struct inv_sensors_timestamp *ts = &sensor_st->ts;
 	struct device *dev = regmap_get_device(st->map);
 	unsigned int sensor;
 	unsigned int *watermark;
@@ -392,6 +394,8 @@ static int inv_icm42600_buffer_postdisable(struct iio_dev *indio_dev)
 
 	mutex_lock(&st->lock);
 
+	inv_sensors_timestamp_apply_odr(ts, 0, 0, 0);
+
 	ret = inv_icm42600_buffer_set_fifo_en(st, st->fifo.en & ~sensor);
 	if (ret)
 		goto out_unlock;

---
base-commit: 62b44ebc1f2c71db3ca2d4737c52e433f6f03038
change-id: 20260130-inv-icm42600-fix-odr-change-when-turning-buffer-off-3ba36f794cb7

Best regards,
-- 
Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

Re: [PATCH] iio: imu: inv_icm42600: fix odr switch when turning buffer off

[Jonathan Cameron]

On Fri, 30 Jan 2026 17:10:23 +0100
Jean-Baptiste Maneyrol via B4 Relay <devnull+jean-baptiste.maneyrol.tdk.com@kernel.org> wrote:

> From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
> 
> ODR switch is done in 2 steps when FIFO is on : change the ODR register
> value and acknowledge change when reading the FIFO ODR change flag.
> When we are switching odr and turning buffer off just afterward, we are
> losing the FIFO ODR change flag and ODR switch is blocked.
> 
> Fix the issue by force applying any waiting ODR change when turning
> buffer off.
> 
> Fixes: ec74ae9fd37c ("iio: imu: inv_icm42600: add accurate timestamping")
> Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
> Cc: stable@vger.kernel.org
Applied to my local tree for now. I'll rebase on something sensible in next
few weeks then push it out.

Thanks,

Jonathan