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iio: invensense: fix interrupt timestamp alignment

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Restrict interrupt timestamp alignment for not overflowing max/min
period thresholds.

Fixes: 0ecc363cce ("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>
This commit is contained in:
Jean-Baptiste Maneyrol 2024-04-26 13:58:14 +00:00 committed by Jonathan Cameron
parent 561e2e3e90
commit 0340dc4c82
1 changed files with 7 additions and 2 deletions
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9
drivers/iio/common/inv_sensors/inv_sensors_timestamp.c
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@ -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) 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 delta, jitter;
int64_t adjust; int64_t adjust;
@ -108,11 +111,13 @@ static void inv_align_timestamp_it(struct inv_sensors_timestamp *ts)
delta = ts->it.lo - ts->timestamp; delta = ts->it.lo - ts->timestamp;
/* adjust timestamp while respecting jitter */ /* 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); jitter = INV_SENSORS_TIMESTAMP_JITTER((int64_t)ts->period, ts->chip.jitter);
if (delta > jitter) if (delta > jitter)
adjust = jitter; adjust = add_max;
else if (delta < -jitter) else if (delta < -jitter)
adjust = -jitter; adjust = sub_max;
else else
adjust = 0; adjust = 0;