Re: [PATCH 6.6.y] iio: imu: inv_icm42600: fix odr switch when turning buffer off

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Mar 17, 2026 at 03:19:40PM +0000, inv.git-commit@tdk.com wrote:
> From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
> 
> ODR switch is done in 2 steps when FIFO is on : change the ODR register
> value and acknowledge change when reading the FIFO ODR change flag.
> When we are switching odr and turning buffer off just afterward, we are
> losing the FIFO ODR change flag and ODR switch is blocked.
> 
> Fix the issue by force applying any waiting ODR change when turning
> buffer off.
> 
> Fixes: ec74ae9fd37c ("iio: imu: inv_icm42600: add accurate timestamping")
> Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
> Cc: stable@vger.kernel.org
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
>  drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
> index aca6ce758890..743580ea5845 100644
> --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
> +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
> @@ -378,6 +378,7 @@ static int inv_icm42600_buffer_predisable(struct iio_dev *indio_dev)
>  static int inv_icm42600_buffer_postdisable(struct iio_dev *indio_dev)
>  {
>  	struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
> +	struct inv_sensors_timestamp *ts = iio_priv(indio_dev);
>  	struct device *dev = regmap_get_device(st->map);
>  	unsigned int sensor;
>  	unsigned int *watermark;
> @@ -399,6 +400,8 @@ static int inv_icm42600_buffer_postdisable(struct iio_dev *indio_dev)
>  
>  	mutex_lock(&st->lock);
>  
> +	inv_sensors_timestamp_apply_odr(ts, 0, 0, 0);
> +
>  	ret = inv_icm42600_buffer_set_fifo_en(st, st->fifo.en & ~sensor);
>  	if (ret)
>  		goto out_unlock;
> -- 
> 2.25.1
> 
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>