On 30/12/16 10:49, Jonathan Cameron wrote:
> 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?
Actually don't worry. It applies cleanly to my fixes-togreg-post-rc1 branch anyway
so I'll take it that way and send upstream asap.
Applied to the fixes-togreg-post-rc1 branch and marked for stable.
Thanks,
Jonathan
>
> 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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