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| author | Viorel Suman <viorel.suman@gmail.com> | 2015-02-18 20:05:21 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-04-22 08:58:38 +0200 |
| commit | 6e106485980c6a4776a38a3941130f623e0b54db (patch) | |
| tree | b09cc33904b35f4592d637694ef6c7e06886d89d /drivers | |
| parent | b71eafb8217c2006b45a4a056b0421870d16a6c4 (diff) | |
| download | lwn-6e106485980c6a4776a38a3941130f623e0b54db.tar.gz lwn-6e106485980c6a4776a38a3941130f623e0b54db.zip | |
iio: inv_mpu6050: Clear timestamps fifo while resetting hardware fifo
commit 4dac0a8eefd55bb1f157d1a5a084531334a2d74c upstream.
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>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 25 |
1 files 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 7da0832f187b..01d661e0fa6c 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c @@ -25,6 +25,16 @@ #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; @@ -51,6 +61,10 @@ 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) { @@ -84,16 +98,6 @@ 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. */ @@ -187,7 +191,6 @@ 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); |