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SubjectRe: [PATCH 4/7] iio: adc: stm32-dfsdm: fix multiple channel initialization
On Fri, 23 Feb 2018 13:50:58 +0100
Fabrice Gasnier <fabrice.gasnier@st.com> wrote:

> When several channels are registered (e.g. via st,adc-channels property):
> - channels array is wrongly filled in. Only 1st element in array is being
> initialized with last registered channel.
> Fix it by passing reference to relevant channel (e.g. array[index]).
> - only last initialized channel can work properly (e.g. unique 'ch_id'
> is used). Converting any other channel result in conversion timeout.
> Fix it by getting rid of 'ch_id', use chan->channel instead.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Applied to the fixes-togreg branch of iio.git.

Thanks,

Jonathan

> ---
> drivers/iio/adc/stm32-dfsdm-adc.c | 39 +++++++++++++++++++++------------------
> 1 file changed, 21 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 0eff811..01422d1 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -54,7 +54,6 @@ struct stm32_dfsdm_adc {
> struct stm32_dfsdm *dfsdm;
> const struct stm32_dfsdm_dev_data *dev_data;
> unsigned int fl_id;
> - unsigned int ch_id;
>
> /* ADC specific */
> unsigned int oversamp;
> @@ -384,7 +383,7 @@ static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev,
> {
> struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[adc->fl_id];
> - struct stm32_dfsdm_channel *ch = &adc->dfsdm->ch_list[adc->ch_id];
> + struct stm32_dfsdm_channel *ch = &adc->dfsdm->ch_list[chan->channel];
> unsigned int sample_freq = adc->sample_freq;
> unsigned int spi_freq;
> int ret;
> @@ -419,18 +418,20 @@ static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev,
> return len;
> }
>
> -static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc, bool dma)
> +static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc,
> + const struct iio_chan_spec *chan,
> + bool dma)
> {
> struct regmap *regmap = adc->dfsdm->regmap;
> int ret;
> unsigned int dma_en = 0, cont_en = 0;
>
> - ret = stm32_dfsdm_start_channel(adc->dfsdm, adc->ch_id);
> + ret = stm32_dfsdm_start_channel(adc->dfsdm, chan->channel);
> if (ret < 0)
> return ret;
>
> ret = stm32_dfsdm_filter_configure(adc->dfsdm, adc->fl_id,
> - adc->ch_id);
> + chan->channel);
> if (ret < 0)
> goto stop_channels;
>
> @@ -464,12 +465,13 @@ static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc, bool dma)
>
> regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> DFSDM_CR1_RCONT_MASK, 0);
> - stm32_dfsdm_stop_channel(adc->dfsdm, adc->ch_id);
> + stm32_dfsdm_stop_channel(adc->dfsdm, chan->channel);
>
> return ret;
> }
>
> -static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc)
> +static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc,
> + const struct iio_chan_spec *chan)
> {
> struct regmap *regmap = adc->dfsdm->regmap;
>
> @@ -482,7 +484,7 @@ static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc)
> regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> DFSDM_CR1_RCONT_MASK, 0);
>
> - stm32_dfsdm_stop_channel(adc->dfsdm, adc->ch_id);
> + stm32_dfsdm_stop_channel(adc->dfsdm, chan->channel);
> }
>
> static int stm32_dfsdm_set_watermark(struct iio_dev *indio_dev,
> @@ -609,6 +611,7 @@ static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev)
> static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
> {
> struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> + const struct iio_chan_spec *chan = &indio_dev->channels[0];
> int ret;
>
> /* Reset adc buffer index */
> @@ -618,7 +621,7 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
> if (ret < 0)
> return ret;
>
> - ret = stm32_dfsdm_start_conv(adc, true);
> + ret = stm32_dfsdm_start_conv(adc, chan, true);
> if (ret) {
> dev_err(&indio_dev->dev, "Can't start conversion\n");
> goto stop_dfsdm;
> @@ -635,7 +638,7 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
> return 0;
>
> err_stop_conv:
> - stm32_dfsdm_stop_conv(adc);
> + stm32_dfsdm_stop_conv(adc, chan);
> stop_dfsdm:
> stm32_dfsdm_stop_dfsdm(adc->dfsdm);
>
> @@ -645,11 +648,12 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
> static int stm32_dfsdm_predisable(struct iio_dev *indio_dev)
> {
> struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> + const struct iio_chan_spec *chan = &indio_dev->channels[0];
>
> if (adc->dma_chan)
> dmaengine_terminate_all(adc->dma_chan);
>
> - stm32_dfsdm_stop_conv(adc);
> + stm32_dfsdm_stop_conv(adc, chan);
>
> stm32_dfsdm_stop_dfsdm(adc->dfsdm);
>
> @@ -730,7 +734,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev,
> if (ret < 0)
> goto stop_dfsdm;
>
> - ret = stm32_dfsdm_start_conv(adc, false);
> + ret = stm32_dfsdm_start_conv(adc, chan, false);
> if (ret < 0) {
> regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id),
> DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(0));
> @@ -751,7 +755,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev,
> else
> ret = IIO_VAL_INT;
>
> - stm32_dfsdm_stop_conv(adc);
> + stm32_dfsdm_stop_conv(adc, chan);
>
> stop_dfsdm:
> stm32_dfsdm_stop_dfsdm(adc->dfsdm);
> @@ -765,7 +769,7 @@ 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 = &adc->dfsdm->fl_list[adc->fl_id];
> - struct stm32_dfsdm_channel *ch = &adc->dfsdm->ch_list[adc->ch_id];
> + struct stm32_dfsdm_channel *ch = &adc->dfsdm->ch_list[chan->channel];
> unsigned int spi_freq = adc->spi_freq;
> int ret = -EINVAL;
>
> @@ -972,7 +976,6 @@ static int stm32_dfsdm_adc_chan_init_one(struct iio_dev *indio_dev,
> }
> ch->scan_type.realbits = 24;
> ch->scan_type.storagebits = 32;
> - adc->ch_id = ch->channel;
>
> return stm32_dfsdm_chan_configure(adc->dfsdm,
> &adc->dfsdm->ch_list[ch->channel]);
> @@ -1001,7 +1004,7 @@ static int stm32_dfsdm_audio_init(struct iio_dev *indio_dev)
> }
> ch->info_mask_separate = BIT(IIO_CHAN_INFO_SAMP_FREQ);
>
> - d_ch = &adc->dfsdm->ch_list[adc->ch_id];
> + d_ch = &adc->dfsdm->ch_list[ch->channel];
> if (d_ch->src != DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL)
> adc->spi_freq = adc->dfsdm->spi_master_freq;
>
> @@ -1042,8 +1045,8 @@ static int stm32_dfsdm_adc_init(struct iio_dev *indio_dev)
> return -ENOMEM;
>
> for (chan_idx = 0; chan_idx < num_ch; chan_idx++) {
> - ch->scan_index = chan_idx;
> - ret = stm32_dfsdm_adc_chan_init_one(indio_dev, ch);
> + ch[chan_idx].scan_index = chan_idx;
> + ret = stm32_dfsdm_adc_chan_init_one(indio_dev, &ch[chan_idx]);
> if (ret < 0) {
> dev_err(&indio_dev->dev, "Channels init failed\n");
> return ret;

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