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iio: imu: inv_icm42600: fix timestamping by limiting FIFO reading

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commit affe3f077d upstream.

Timestamps are made by measuring the chip clock using the watermark
interrupts. If we read more than watermark samples as done today, we
are reducing the period between interrupts and distort the time
measurement. Fix that by reading only watermark samples in the
interrupt case.

Fixes: 7f85e42a6c ("iio: imu: inv_icm42600: add buffer support in iio devices")
Cc: stable@vger.kernel.org
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jean-Baptiste Maneyrol
2026-07-18 16:53:08 +02:00
committed by Greg Kroah-Hartman
parent 34656a5932
commit 76e12a71ac
2 changed files with 6 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
+5 -4
View File
@@ -248,6 +248,7 @@ int inv_icm42600_buffer_update_watermark(struct inv_icm42600_state *st)
/* compute watermark value in bytes */
wm_size = watermark * packet_size;
st->fifo.watermark.value = watermark;
/* changing FIFO watermark requires to turn off watermark interrupt */
ret = regmap_update_bits_check(st->map, INV_ICM42600_REG_INT_SOURCE0,
@@ -454,11 +455,10 @@ int inv_icm42600_buffer_fifo_read(struct inv_icm42600_state *st,
st->fifo.nb.accel = 0;
st->fifo.nb.total = 0;
/* compute maximum FIFO read size */
/* compute maximum FIFO read size (watermark for max = 0 interrupt case) */
if (max == 0)
max_count = sizeof(st->fifo.data);
else
max_count = max * inv_icm42600_get_packet_size(st->fifo.en);
max = st->fifo.watermark.value;
max_count = max * inv_icm42600_get_packet_size(st->fifo.en);
/* read FIFO count value */
raw_fifo_count = (__be16 *)st->buffer;
@@ -574,6 +574,7 @@ int inv_icm42600_buffer_init(struct inv_icm42600_state *st)
st->fifo.watermark.eff_gyro = 1;
st->fifo.watermark.eff_accel = 1;
st->fifo.watermark.value = 1;
/*
* Default FIFO configuration (bits 7 to 5)
drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.h
+1
View File
@@ -34,6 +34,7 @@ struct inv_icm42600_fifo {
unsigned int accel;
unsigned int eff_gyro;
unsigned int eff_accel;
unsigned int value;
} watermark;
size_t count;
struct {