On 08/12/16 14:22, Marcin Niestroj wrote:
> 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@xxxxxxxxxxxxxxxx>
This looks like a definite bug that we would want to fix in stable as well.
If possible, could you ensure this is the first patch in the updated series?
Thanks,
Jonathan
> ---
> Patch introduced in v2
>
> drivers/iio/imu/bmi160/bmi160_core.c | 25 ++++++-------------------
> 1 file changed, 6 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
> index 095533c..88bcf3f 100644
> --- a/drivers/iio/imu/bmi160/bmi160_core.c
> +++ b/drivers/iio/imu/bmi160/bmi160_core.c
> @@ -67,10 +67,8 @@
>
> #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) { \
> @@ -153,20 +151,9 @@ 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 {
> @@ -293,7 +280,7 @@ 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;
> }
>
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