[PATCH 2/2] iio: adc: stm32-dfsdm: fix sample rate for div2 spi clock
When channel clk source is set to "CLKOUT_F" or "CLKOUT_R" (e.g. div2),
sample rate is currently set to half the requested value.
Fixes: eca949800d2d ("IIO: ADC: add stm32 DFSDM support for PDM
microphone")
Signed-off-by: Fabrice Gasnier
---
drivers/iio/adc/stm32-dfsdm-adc.c | 14 --
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c
b/drivers/iio/adc/stm32-dfsdm-adc.c
index dc911b6..b28a716 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -771,7 +771,7 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
struct stm32_dfsdm_filter *fl = >dfsdm->fl_list[adc->fl_id];
struct stm32_dfsdm_channel *ch = >dfsdm->ch_list[chan->channel];
- unsigned int spi_freq = adc->spi_freq;
+ unsigned int spi_freq;
int ret = -EINVAL;
switch (mask) {
@@ -785,8 +785,18 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SAMP_FREQ:
if (!val)
return -EINVAL;
- if (ch->src != DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL)
+
+ switch (ch->src) {
+ case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
spi_freq = adc->dfsdm->spi_master_freq;
+ break;
+ case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING:
+ case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING:
+ spi_freq = adc->dfsdm->spi_master_freq / 2;
+ break;
+ default:
+ spi_freq = adc->spi_freq;
+ }
if (spi_freq % val)
dev_warn(_dev->dev,
--
1.9.1
[PATCH 2/2] iio: adc: stm32-dfsdm: fix sample rate for div2 spi clock
When channel clk source is set to "CLKOUT_F" or "CLKOUT_R" (e.g. div2),
sample rate is currently set to half the requested value.
Fixes: eca949800d2d ("IIO: ADC: add stm32 DFSDM support for PDM
microphone")
Signed-off-by: Fabrice Gasnier
---
drivers/iio/adc/stm32-dfsdm-adc.c | 14 --
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c
b/drivers/iio/adc/stm32-dfsdm-adc.c
index dc911b6..b28a716 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -771,7 +771,7 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
struct stm32_dfsdm_filter *fl = >dfsdm->fl_list[adc->fl_id];
struct stm32_dfsdm_channel *ch = >dfsdm->ch_list[chan->channel];
- unsigned int spi_freq = adc->spi_freq;
+ unsigned int spi_freq;
int ret = -EINVAL;
switch (mask) {
@@ -785,8 +785,18 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SAMP_FREQ:
if (!val)
return -EINVAL;
- if (ch->src != DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL)
+
+ switch (ch->src) {
+ case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
spi_freq = adc->dfsdm->spi_master_freq;
+ break;
+ case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING:
+ case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING:
+ spi_freq = adc->dfsdm->spi_master_freq / 2;
+ break;
+ default:
+ spi_freq = adc->spi_freq;
+ }
if (spi_freq % val)
dev_warn(_dev->dev,
--
1.9.1
