diff options
author | Jean-Baptiste Maneyrol <jmaneyrol@invensense.com> | 2018-05-22 16:18:18 +0200 |
---|---|---|
committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-06-10 11:52:28 +0100 |
commit | 3ca4fb431b83faaeb9476d10f394882e135a3d83 (patch) | |
tree | bb81dae6a19afd7ce4ca91ddfb46904fe2bb2638 /drivers/iio/imu/inv_mpu6050 | |
parent | c2c8406b315f7606175b85e9ac1b4fc0972c917f (diff) |
iio: imu: inv_mpu6050: replace timestamp fifo by generic timestamp
Using a fifo for storing timestamps is useless since the interrupt
is in one-shot mode, preventing the hard irq handler to be called
when the irq thread is running. Instead use the generic timestamp
function iio_pollfunc_store_time.
Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/imu/inv_mpu6050')
-rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 6 | ||||
-rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 10 | ||||
-rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 44 |
3 files changed, 2 insertions, 58 deletions
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index f9c0624505a2..08937a6d59db 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -20,8 +20,6 @@ #include <linux/jiffies.h> #include <linux/irq.h> #include <linux/interrupt.h> -#include <linux/kfifo.h> -#include <linux/spinlock.h> #include <linux/iio/iio.h> #include <linux/acpi.h> #include <linux/platform_device.h> @@ -1003,7 +1001,7 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, indio_dev->modes = INDIO_BUFFER_TRIGGERED; result = devm_iio_triggered_buffer_setup(dev, indio_dev, - inv_mpu6050_irq_handler, + iio_pollfunc_store_time, inv_mpu6050_read_fifo, NULL); if (result) { @@ -1016,8 +1014,6 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, return result; } - INIT_KFIFO(st->timestamps); - spin_lock_init(&st->time_stamp_lock); result = devm_iio_device_register(dev, indio_dev); if (result) { dev_err(dev, "IIO register fail %d\n", result); diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h index c54da777945d..a92ddd45586c 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h @@ -12,8 +12,6 @@ */ #include <linux/i2c.h> #include <linux/i2c-mux.h> -#include <linux/kfifo.h> -#include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> @@ -116,36 +114,30 @@ struct inv_mpu6050_hw { /* * struct inv_mpu6050_state - Driver state variables. - * @TIMESTAMP_FIFO_SIZE: fifo size for timestamp. * @lock: Chip access lock. * @trig: IIO trigger. * @chip_config: Cached attribute information. * @reg: Map of important registers. * @hw: Other hardware-specific information. * @chip_type: chip type. - * @time_stamp_lock: spin lock to time stamp. * @plat_data: platform data (deprecated in favor of @orientation). * @orientation: sensor chip orientation relative to main hardware. - * @timestamps: kfifo queue to store time stamp. * @map regmap pointer. * @irq interrupt number. * @irq_mask the int_pin_cfg mask to configure interrupt type. */ struct inv_mpu6050_state { -#define TIMESTAMP_FIFO_SIZE 16 struct mutex lock; struct iio_trigger *trig; struct inv_mpu6050_chip_config chip_config; const struct inv_mpu6050_reg_map *reg; const struct inv_mpu6050_hw *hw; enum inv_devices chip_type; - spinlock_t time_stamp_lock; struct i2c_mux_core *muxc; struct i2c_client *mux_client; unsigned int powerup_count; struct inv_mpu6050_platform_data plat_data; struct iio_mount_matrix orientation; - DECLARE_KFIFO(timestamps, long long, TIMESTAMP_FIFO_SIZE); struct regmap *map; int irq; u8 irq_mask; @@ -234,7 +226,6 @@ struct inv_mpu6050_state { /* init parameters */ #define INV_MPU6050_INIT_FIFO_RATE 50 -#define INV_MPU6050_TIME_STAMP_TOR 5 #define INV_MPU6050_MAX_FIFO_RATE 1000 #define INV_MPU6050_MIN_FIFO_RATE 4 #define INV_MPU6050_ONE_K_HZ 1000 @@ -300,7 +291,6 @@ enum inv_mpu6050_clock_sel_e { NUM_CLK }; -irqreturn_t inv_mpu6050_irq_handler(int irq, void *p); irqreturn_t inv_mpu6050_read_fifo(int irq, void *p); int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev, int irq_type); int inv_reset_fifo(struct iio_dev *indio_dev); diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c index 1795418438e4..5436d181f2dc 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c @@ -19,20 +19,9 @@ #include <linux/jiffies.h> #include <linux/irq.h> #include <linux/interrupt.h> -#include <linux/kfifo.h> #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; @@ -62,9 +51,6 @@ int inv_reset_fifo(struct iio_dev *indio_dev) 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) { @@ -99,23 +85,6 @@ reset_fifo_fail: } /** - * inv_mpu6050_irq_handler() - Cache a timestamp at each data ready interrupt. - */ -irqreturn_t inv_mpu6050_irq_handler(int irq, void *p) -{ - struct iio_poll_func *pf = p; - struct iio_dev *indio_dev = pf->indio_dev; - struct inv_mpu6050_state *st = iio_priv(indio_dev); - s64 timestamp; - - timestamp = iio_get_time_ns(indio_dev); - kfifo_in_spinlocked(&st->timestamps, ×tamp, 1, - &st->time_stamp_lock); - - return IRQ_WAKE_THREAD; -} - -/** * inv_mpu6050_read_fifo() - Transfer data from hardware FIFO to KFIFO. */ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p) @@ -127,7 +96,7 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p) int result; u8 data[INV_MPU6050_OUTPUT_DATA_SIZE]; u16 fifo_count; - s64 timestamp; + s64 timestamp = pf->timestamp; int int_status; mutex_lock(&st->lock); @@ -171,28 +140,17 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p) goto flush_fifo; if (fifo_count > INV_MPU6050_FIFO_THRESHOLD) goto flush_fifo; - /* Timestamp mismatch. */ - if (kfifo_len(&st->timestamps) > - fifo_count / bytes_per_datum + INV_MPU6050_TIME_STAMP_TOR) - goto flush_fifo; do { result = regmap_bulk_read(st->map, st->reg->fifo_r_w, data, bytes_per_datum); if (result) goto flush_fifo; - - result = kfifo_out(&st->timestamps, ×tamp, 1); - /* when there is no timestamp, put timestamp as 0 */ - if (result == 0) - timestamp = 0; - /* skip first samples if needed */ if (st->skip_samples) st->skip_samples--; else iio_push_to_buffers_with_timestamp(indio_dev, data, timestamp); - fifo_count -= bytes_per_datum; } while (fifo_count >= bytes_per_datum); |