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iio: bmi160: Fix time needed to sleep after command execution

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Datasheet specifies typical and maximum execution times for which CMD
register is occupied after previous command execution. We took these
values as minimum and maximum time for usleep_range() call before making
a new command execution.

To be sure, that the CMD register is no longer occupied we need to wait
*at least* the maximum time specified by datasheet.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Marcin Niestroj 2016-12-08 15:22:58 +01:00 committed by Jonathan Cameron
parent e91c3dfcd3
commit 01d1f7a99e
1 changed files with 6 additions and 19 deletions
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25
drivers/iio/imu/bmi160/bmi160_core.c
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@ -66,10 +66,8 @@
#define BMI160_REG_DUMMY 0x7F
#define BMI160_ACCEL_PMU_MIN_USLEEP 3200
#define BMI160_ACCEL_PMU_MAX_USLEEP 3800
#define BMI160_GYRO_PMU_MIN_USLEEP 55000
#define BMI160_GYRO_PMU_MAX_USLEEP 80000
#define BMI160_ACCEL_PMU_MIN_USLEEP 3800
#define BMI160_GYRO_PMU_MIN_USLEEP 80000
#define BMI160_SOFTRESET_USLEEP 1000
#define BMI160_CHANNEL(_type, _axis, _index) { \
@ -151,20 +149,9 @@ static struct bmi160_regs bmi160_regs[] = {
},
};
struct bmi160_pmu_time {
unsigned long min;
unsigned long max;
};
static struct bmi160_pmu_time bmi160_pmu_time[] = {
[BMI160_ACCEL] = {
.min = BMI160_ACCEL_PMU_MIN_USLEEP,
.max = BMI160_ACCEL_PMU_MAX_USLEEP
},
[BMI160_GYRO] = {
.min = BMI160_GYRO_PMU_MIN_USLEEP,
.max = BMI160_GYRO_PMU_MIN_USLEEP,
},
static unsigned long bmi160_pmu_time[] = {
[BMI160_ACCEL] = BMI160_ACCEL_PMU_MIN_USLEEP,
[BMI160_GYRO] = BMI160_GYRO_PMU_MIN_USLEEP,
};
struct bmi160_scale {
@ -289,7 +276,7 @@ int bmi160_set_mode(struct bmi160_data *data, enum bmi160_sensor_type t,
if (ret < 0)
return ret;
usleep_range(bmi160_pmu_time[t].min, bmi160_pmu_time[t].max);
usleep_range(bmi160_pmu_time[t], bmi160_pmu_time[t] + 1000);
return 0;
}