- Remove processing related to DMA in irq handler as this
data transfer is managed directly in DMA callback.
- Update comment in stm32_adc_set_watermark() function.
Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxx>
---
drivers/iio/adc/stm32-adc.c | 29 ++++++-----------------------
1 file changed, 6 insertions(+), 23 deletions(-)
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index b3f31f147347..08be826f1462 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -1310,7 +1310,7 @@ static int stm32_adc_set_watermark(struct iio_dev *indio_dev, unsigned int val)
* dma cyclic transfers are used, buffer is split into two periods.
* There should be :
* - always one buffer (period) dma is working on
- * - one buffer (period) driver can push with iio_trigger_poll().
+ * - one buffer (period) driver can push data.
*/
watermark = min(watermark, val * (unsigned)(sizeof(u16)));
adc->rx_buf_sz = min(rx_buf_sz, watermark * 2 * adc->num_conv);
@@ -1573,31 +1573,14 @@ static irqreturn_t stm32_adc_trigger_handler(int irq, void *p)
dev_dbg(&indio_dev->dev, "%s bufi=%d\n", __func__, adc->bufi);
- if (!adc->dma_chan) {
- /* reset buffer index */
- adc->bufi = 0;
- iio_push_to_buffers_with_timestamp(indio_dev, adc->buffer,
- pf->timestamp);
- } else {
- int residue = stm32_adc_dma_residue(adc);
-
- while (residue >= indio_dev->scan_bytes) {
- u16 *buffer = (u16 *)&adc->rx_buf[adc->bufi];
-
- iio_push_to_buffers_with_timestamp(indio_dev, buffer,
- pf->timestamp);
- residue -= indio_dev->scan_bytes;
- adc->bufi += indio_dev->scan_bytes;
- if (adc->bufi >= adc->rx_buf_sz)
- adc->bufi = 0;
- }
- }
-
+ /* reset buffer index */
+ adc->bufi = 0;
+ iio_push_to_buffers_with_timestamp(indio_dev, adc->buffer,
+ pf->timestamp);
iio_trigger_notify_done(indio_dev->trig);
/* re-enable eoc irq */
- if (!adc->dma_chan)
- stm32_adc_conv_irq_enable(adc);
+ stm32_adc_conv_irq_enable(adc);
return IRQ_HANDLED;
}
--
2.17.1
