On 16/02/15 22:59, Viorel Suman wrote:
> A hardware fifo reset always imply an invalidation of the
> existing timestamps, so we'll clear timestamps fifo on
> successfull hardware fifo reset.
For reference, this wants iio:inv_mpu6050 as a prefix as the current
implies it is IIO in general rather than the particular driver.
>
> Signed-off-by: Viorel Suman <viorel.suman@xxxxxxxxx>
> ---
> drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 25 ++++++++++++++-----------
> 1 file changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
> index 0cd306a..ba27e27 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
> @@ -24,6 +24,16 @@
> #include <linux/poll.h>
> #include "inv_mpu_iio.h"
>
> +static void inv_clear_kfifo(struct inv_mpu6050_state *st)
> +{
> + unsigned long flags;
> +
> + /* take the spin lock sem to avoid interrupt kick in */
> + spin_lock_irqsave(&st->time_stamp_lock, flags);
> + kfifo_reset(&st->timestamps);
> + spin_unlock_irqrestore(&st->time_stamp_lock, flags);
> +}
> +
> int inv_reset_fifo(struct iio_dev *indio_dev)
> {
> int result;
> @@ -50,6 +60,10 @@ int inv_reset_fifo(struct iio_dev *indio_dev)
> INV_MPU6050_BIT_FIFO_RST);
> if (result)
> goto reset_fifo_fail;
> +
> + /* clear timestamps fifo */
> + inv_clear_kfifo(st);
> +
> /* enable interrupt */
> if (st->chip_config.accl_fifo_enable ||
> st->chip_config.gyro_fifo_enable) {
> @@ -83,16 +97,6 @@ reset_fifo_fail:
> return result;
> }
>
> -static void inv_clear_kfifo(struct inv_mpu6050_state *st)
> -{
> - unsigned long flags;
> -
> - /* take the spin lock sem to avoid interrupt kick in */
> - spin_lock_irqsave(&st->time_stamp_lock, flags);
> - kfifo_reset(&st->timestamps);
> - spin_unlock_irqrestore(&st->time_stamp_lock, flags);
> -}
> -
> /**
> * inv_mpu6050_irq_handler() - Cache a timestamp at each data ready interrupt.
> */
> @@ -184,7 +188,6 @@ end_session:
> flush_fifo:
> /* Flush HW and SW FIFOs. */
> inv_reset_fifo(indio_dev);
> - inv_clear_kfifo(st);
> mutex_unlock(&indio_dev->mlock);
> iio_trigger_notify_done(indio_dev->trig);
>
>
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