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Subject[PATCH 2/2] ASoC: stm32: dfsdm: add actual resolution trace
Date
Add a trace to report actual resolution of audio samples.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
drivers/iio/adc/stm32-dfsdm-adc.c | 4 ++++
drivers/iio/adc/stm32-dfsdm.h | 2 ++
2 files changed, 6 insertions(+)

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 5e10fb4f3704..b7e9ef1a6eec 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -293,6 +293,7 @@ static int stm32_dfsdm_compute_osrs(struct stm32_dfsdm_filter *fl,
max >>= flo->rshift;
}
flo->max = (s32)max;
+ flo->bits = bits;

pr_debug("%s: fast %d, fosr %d, iosr %d, res 0x%llx/%d bits, rshift %d, lshift %d\n",
__func__, fast, flo->fosr, flo->iosr,
@@ -476,6 +477,9 @@ static int stm32_dfsdm_channels_configure(struct iio_dev *indio_dev,
if (!flo->res)
return -EINVAL;

+ dev_dbg(&indio_dev->dev, "Samples actual resolution: %d bits",
+ min(flo->bits, (u32)DFSDM_DATA_RES - 1));
+
for_each_set_bit(bit, &adc->smask,
sizeof(adc->smask) * BITS_PER_BYTE) {
chan = indio_dev->channels + bit;
diff --git a/drivers/iio/adc/stm32-dfsdm.h b/drivers/iio/adc/stm32-dfsdm.h
index 5dbdae4ed881..4afc1f528b78 100644
--- a/drivers/iio/adc/stm32-dfsdm.h
+++ b/drivers/iio/adc/stm32-dfsdm.h
@@ -249,6 +249,7 @@ enum stm32_dfsdm_sinc_order {
* @rshift: output sample right shift (hardware shift)
* @lshift: output sample left shift (software shift)
* @res: output sample resolution
+ * @bits: output sample resolution in bits
* @max: output sample maximum positive value
*/
struct stm32_dfsdm_filter_osr {
@@ -257,6 +258,7 @@ struct stm32_dfsdm_filter_osr {
unsigned int rshift;
unsigned int lshift;
u64 res;
+ u32 bits;
s32 max;
};

--
2.17.1
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