iio: imu: inv_icm42600: stabilized timestamp in interrupt

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Use IRQF_ONESHOT flag to ensure the timestamp is not updated in the
hard handler during the thread handler. And compute and use the
effective watermark value that correspond to this first timestamp.

This way we can ensure the timestamp is always corresponding to the
value used by the timestamping mechanism. Otherwise, it is possible
that between FIFO count read and FIFO processing the timestamp is
overwritten in the hard handler.

Fixes: ec74ae9fd3 ("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://lore.kernel.org/r/20240529154717.651863-1-inv.git-commit@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Jean-Baptiste Maneyrol 2024-05-29 15:47:17 +00:00 • committed by Jonathan Cameron

parent 95444b9eeb

commit d7bd473632

3 changed files with 20 additions and 2 deletions

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19

drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c

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2

drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.h

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1

drivers/iio/imu/inv_icm42600/inv_icm42600_core.c

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