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path: root/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
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Diffstat (limited to 'drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c')
-rw-r--r--drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c25
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 0cd306a72a6e..ba27e277511f 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 @@
24#include <linux/poll.h> 24#include <linux/poll.h>
25#include "inv_mpu_iio.h" 25#include "inv_mpu_iio.h"
26 26
27static void inv_clear_kfifo(struct inv_mpu6050_state *st)
28{
29 unsigned long flags;
30
31 /* take the spin lock sem to avoid interrupt kick in */
32 spin_lock_irqsave(&st->time_stamp_lock, flags);
33 kfifo_reset(&st->timestamps);
34 spin_unlock_irqrestore(&st->time_stamp_lock, flags);
35}
36
27int inv_reset_fifo(struct iio_dev *indio_dev) 37int inv_reset_fifo(struct iio_dev *indio_dev)
28{ 38{
29 int result; 39 int result;
@@ -50,6 +60,10 @@ int inv_reset_fifo(struct iio_dev *indio_dev)
50 INV_MPU6050_BIT_FIFO_RST); 60 INV_MPU6050_BIT_FIFO_RST);
51 if (result) 61 if (result)
52 goto reset_fifo_fail; 62 goto reset_fifo_fail;
63
64 /* clear timestamps fifo */
65 inv_clear_kfifo(st);
66
53 /* enable interrupt */ 67 /* enable interrupt */
54 if (st->chip_config.accl_fifo_enable || 68 if (st->chip_config.accl_fifo_enable ||
55 st->chip_config.gyro_fifo_enable) { 69 st->chip_config.gyro_fifo_enable) {
@@ -83,16 +97,6 @@ reset_fifo_fail:
83 return result; 97 return result;
84} 98}
85 99
86static void inv_clear_kfifo(struct inv_mpu6050_state *st)
87{
88 unsigned long flags;
89
90 /* take the spin lock sem to avoid interrupt kick in */
91 spin_lock_irqsave(&st->time_stamp_lock, flags);
92 kfifo_reset(&st->timestamps);
93 spin_unlock_irqrestore(&st->time_stamp_lock, flags);
94}
95
96/** 100/**
97 * inv_mpu6050_irq_handler() - Cache a timestamp at each data ready interrupt. 101 * inv_mpu6050_irq_handler() - Cache a timestamp at each data ready interrupt.
98 */ 102 */
@@ -184,7 +188,6 @@ end_session:
184flush_fifo: 188flush_fifo:
185 /* Flush HW and SW FIFOs. */ 189 /* Flush HW and SW FIFOs. */
186 inv_reset_fifo(indio_dev); 190 inv_reset_fifo(indio_dev);
187 inv_clear_kfifo(st);
188 mutex_unlock(&indio_dev->mlock); 191 mutex_unlock(&indio_dev->mlock);
189 iio_trigger_notify_done(indio_dev->trig); 192 iio_trigger_notify_done(indio_dev->trig);
190 193