[PATCH] iio: inv_sensors: do not compute period estimation when updating odr

[PATCH] iio: inv_sensors: do not compute period estimation when updating odr

[Jean-Baptiste Maneyrol via B4 Relay]

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

When odr is updated, the delta between the interrupts will change and it
will lead to a bad period estimation.

Avoid this by preventing the period estimation in this case.

Fixes: 82bd09ce4fd3 ("iio: inv_sensors: improve period measurement by using a longer delay")
Cc: stable@vger.kernel.org
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
---
 drivers/iio/common/inv_sensors/inv_sensors_timestamp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
index 8c9e81a77e68..7ccd5d5a6986 100644
--- a/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
+++ b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
@@ -142,6 +142,12 @@ void inv_sensors_timestamp_interrupt(struct inv_sensors_timestamp *ts,
 	/* update delta timestamps and estimated period */
 	it = &ts->delta;
 	ts->delta_counter += sample_nb;
+	/* reset in case of odr change */
+	if (ts->new_mult) {
+		it->lo = 0;
+		it->up = 0;
+		ts->delta_counter = 0;
+	}
 	delta = timestamp - it->up;
 	delta_threshold = INV_SENSORS_TIMESTAMP_MIN(INV_SENSORS_MIN_IT_DELTA, ts->chip.jitter);
 	if (delta >= delta_threshold) {
@@ -161,7 +167,7 @@ void inv_sensors_timestamp_interrupt(struct inv_sensors_timestamp *ts,
 	it->lo = it->up;
 	it->up = timestamp;
 	delta = it->up - it->lo;
-	if (it->lo != 0) {
+	if (it->lo != 0 && !ts->new_mult) {
 		/* compute period and check validity */
 		period = div_s64(delta, sample_nb);
 		valid = inv_validate_period(ts, period);

---
base-commit: 43ffda3c7f8456bbe641ae8249a077a361b97880
change-id: 20261020-iio-common-inv-sensors-do-not-compute-period-when-updating-odr-95c976c2149a

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

Re: [PATCH] iio: inv_sensors: do not compute period estimation when updating odr

[Jonathan Cameron]

On Tue, 20 Oct 2026 18:28:47 +0200
Jean-Baptiste Maneyrol via B4 Relay <devnull+jean-baptiste.maneyrol.tdk.com@kernel.org> wrote:

> From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
> 
> When odr is updated, the delta between the interrupts will change and it
> will lead to a bad period estimation.
> 
> Avoid this by preventing the period estimation in this case.
> 
> Fixes: 82bd09ce4fd3 ("iio: inv_sensors: improve period measurement by using a longer delay")
> Cc: stable@vger.kernel.org
> Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Applied to the fixes-togreg branch of iio.git.