On Thu, 5 Nov 2020 18:38:27 +0100
Fabrice Gasnier <fabrice.gasnier@xxxxxx> wrote:
> On 11/5/20 3:29 PM, Olivier Moysan wrote:
> > - 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>
>
> Hi Olivier,
>
> Reviewed-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to poke at it.
Thanks,
Jonathan
>
> Thanks,
> Fabrice
> > ---
> > 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;
> > }
> >
