[PATCH 6.1.y] iio: imu: inv_icm42600: fix timestamps after suspend if sensor is on

[inv.git-commit@tdk.com]

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

Currently suspending while sensors are one will result in timestamping
continuing without gap at resume. It can work with monotonic clock but
not with other clocks. Fix that by resetting timestamping.

Fixes: ec74ae9fd37c ("iio: imu: inv_icm42600: add accurate timestamping")
Cc: stable@vger.kernel.org
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://patch.msgid.link/20241113-inv_icm42600-fix-timestamps-after-suspend-v1-1-dfc77c394173@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
(cherry picked from commit 65a60a590142c54a3f3be11ff162db2d5b0e1e06)
---
 drivers/iio/imu/inv_icm42600/inv_icm42600_core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
index ca85fccc9839..6ffb67f6fb7b 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
@@ -709,6 +709,8 @@ static int __maybe_unused inv_icm42600_suspend(struct device *dev)
 static int __maybe_unused inv_icm42600_resume(struct device *dev)
 {
 	struct inv_icm42600_state *st = dev_get_drvdata(dev);
+	struct inv_icm42600_timestamp *gyro_ts = iio_priv(st->indio_gyro);
+	struct inv_icm42600_timestamp *accel_ts = iio_priv(st->indio_accel);
 	int ret;
 
 	mutex_lock(&st->lock);
@@ -729,9 +731,12 @@ static int __maybe_unused inv_icm42600_resume(struct device *dev)
 		goto out_unlock;
 
 	/* restore FIFO data streaming */
-	if (st->fifo.on)
+	if (st->fifo.on) {
+		inv_icm42600_timestamp_reset(gyro_ts);
+		inv_icm42600_timestamp_reset(accel_ts);
 		ret = regmap_write(st->map, INV_ICM42600_REG_FIFO_CONFIG,
 				   INV_ICM42600_FIFO_CONFIG_STREAM);
+	}
 
 out_unlock:
 	mutex_unlock(&st->lock);
-- 
2.25.1