From 0340dc4c82590d8735c58cf904a8aa1173273ab5 Mon Sep 17 00:00:00 2001
From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Date: Fri, 26 Apr 2024 13:58:14 +0000
Subject: [PATCH] iio: invensense: fix interrupt timestamp alignment
Restrict interrupt timestamp alignment for not overflowing max/min
period thresholds.
Fixes: 0ecc363ccea7 ("iio: make invensense timestamp module generic")
Cc: stable@vger.kernel.org
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://lore.kernel.org/r/20240426135814.141837-1-inv.git-commit@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
drivers/iio/common/inv_sensors/inv_sensors_timestamp.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
index 3b0f9598a7c77..4b8ec16240b5a 100644
--- a/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
+++ b/drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
@@ -101,6 +101,9 @@ static bool inv_update_chip_period(struct inv_sensors_timestamp *ts,
static void inv_align_timestamp_it(struct inv_sensors_timestamp *ts)
{
+ const int64_t period_min = ts->min_period * ts->mult;
+ const int64_t period_max = ts->max_period * ts->mult;
+ int64_t add_max, sub_max;
int64_t delta, jitter;
int64_t adjust;
@@ -108,11 +111,13 @@ static void inv_align_timestamp_it(struct inv_sensors_timestamp *ts)
delta = ts->it.lo - ts->timestamp;
/* adjust timestamp while respecting jitter */
+ add_max = period_max - (int64_t)ts->period;
+ sub_max = period_min - (int64_t)ts->period;
jitter = INV_SENSORS_TIMESTAMP_JITTER((int64_t)ts->period, ts->chip.jitter);
if (delta > jitter)
- adjust = jitter;
+ adjust = add_max;
else if (delta < -jitter)
- adjust = -jitter;
+ adjust = sub_max;
else
adjust = 0;
--
2.30.2