lkml.org 
[lkml]   [2015]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
SubjectRE: [PATCH v2] iio: inv_mpu6050: Clear timestamps fifo while resetting hardware fifo
Date
Look fine to me.
Thanks.

Best Regards,

Ge GAO


-----Original Message-----
From: Jonathan Cameron [mailto:jic23@kernel.org]
Sent: Saturday, February 21, 2015 11:01 AM
To: Viorel Suman; linux-iio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org; Srinivas Pandruvada; Ge Gao
Subject: Re: [PATCH v2] iio: inv_mpu6050: Clear timestamps fifo while resetting hardware fifo

On 18/02/15 18:05, 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.
>
> Signed-off-by: Viorel Suman <viorel.suman@gmail.com>
Looks sensible to me. Ge / Srinivas?
> ---
> v2: Addressed Jonathan's comment regarding the subject prefix.
>
> 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);
>
>



\
 
 \ /
  Last update: 2015-02-26 20:01    [W:0.114 / U:1.356 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site