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| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2018-03-13 17:23:05 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-03-18 01:32:31 +0300 |
| commit | 7531cf59bfa082769887ec70c2029838ea139f11 (patch) | |
| tree | a2fca46b73389c59e35c90e582e2bdf9692c5062 /drivers/iio/adc/ltc2485.c | |
| parent | 490fba90a90eb7b741f57fefd2bcf2c1e11eb471 (diff) | |
| download | linux-7531cf59bfa082769887ec70c2029838ea139f11.tar.xz | |
iio: adc: stm32-dfsdm: fix successive oversampling settings
When doing successive oversampling settings, it may fail to update filter
parameters silently:
- First time oversampling is being set, it will be successful, as fl->res
is 0 initially.
- Next attempts with various oversamp value may return 0 (success), but
keep previous filter parameters, due to 'res' never reaches above or
equal current 'fl->res'.
This is particularly true when setting sampling frequency (that relies on
oversamp). Typical failure without error:
- run 1st test @16kHz samp freq will succeed
- run new test @8kHz will succeed as well
- run new test @16kHz (again): sample rate will remain 8kHz without error
Fixes: e2e6771c6462 ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc/ltc2485.c')
0 files changed, 0 insertions, 0 deletions