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Date:   Sun, 24 Mar 2019 16:44:14 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <linux-iio@...r.kernel.org>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <arnaud.pouliquen@...com>, <olivier.moysan@...com>
Subject: Re: [PATCH v2 3/8] iio: adc: stm32-dfsdm: move dma enable from
 start_conv() to start_dma()

On Thu, 21 Mar 2019 17:47:24 +0100
Fabrice Gasnier <fabrice.gasnier@...com> wrote:

> Move DMA enable (e.g. set RDMAEN bit) away from start_conv() that is used
> for both buffer and single conversions. Thus, single conv rely on
> interrupt, not dma.
> Note: take care to prepare all DMA stuff and set RDMAEN before starting
> filter (can be set only when DFEN=0).
> 
> This is precursor patch to ease support of triggered buffer mode.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
Applied,

Thanks,

Jonathan

> ---
>  drivers/iio/adc/stm32-dfsdm-adc.c | 77 +++++++++++++++++++--------------------
>  1 file changed, 38 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 8690672..818627f 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -429,12 +429,10 @@ static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev,
>  }
>  
>  static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc,
> -				  const struct iio_chan_spec *chan,
> -				  bool dma)
> +				  const struct iio_chan_spec *chan)
>  {
>  	struct regmap *regmap = adc->dfsdm->regmap;
>  	int ret;
> -	unsigned int dma_en = 0;
>  
>  	ret = stm32_dfsdm_start_channel(adc->dfsdm, chan->channel);
>  	if (ret < 0)
> @@ -444,25 +442,12 @@ static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc,
>  	if (ret < 0)
>  		goto stop_channels;
>  
> -	if (dma) {
> -		/* Enable DMA transfer*/
> -		dma_en =  DFSDM_CR1_RDMAEN(1);
> -	}
> -	/* Enable DMA transfer*/
> -	ret = regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> -				 DFSDM_CR1_RDMAEN_MASK, dma_en);
> -	if (ret < 0)
> -		goto filter_unconfigure;
> -
>  	ret = stm32_dfsdm_start_filter(adc->dfsdm, adc->fl_id);
>  	if (ret < 0)
> -		goto stop_dma;
> +		goto filter_unconfigure;
>  
>  	return 0;
>  
> -stop_dma:
> -	regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> -			   DFSDM_CR1_RDMAEN_MASK, 0);
>  filter_unconfigure:
>  	regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
>  			   DFSDM_CR1_CFG_MASK, 0);
> @@ -479,10 +464,6 @@ static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc,
>  
>  	stm32_dfsdm_stop_filter(adc->dfsdm, adc->fl_id);
>  
> -	/* Clean conversion options */
> -	regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> -			   DFSDM_CR1_RDMAEN_MASK, 0);
> -
>  	regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
>  			   DFSDM_CR1_CFG_MASK, 0);
>  
> @@ -599,15 +580,36 @@ static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev)
>  
>  	cookie = dmaengine_submit(desc);
>  	ret = dma_submit_error(cookie);
> -	if (ret) {
> -		dmaengine_terminate_all(adc->dma_chan);
> -		return ret;
> -	}
> +	if (ret)
> +		goto err_stop_dma;
>  
>  	/* Issue pending DMA requests */
>  	dma_async_issue_pending(adc->dma_chan);
>  
> +	/* Enable DMA transfer*/
> +	ret = regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR1(adc->fl_id),
> +				 DFSDM_CR1_RDMAEN_MASK, DFSDM_CR1_RDMAEN_MASK);
> +	if (ret < 0)
> +		goto err_stop_dma;
> +
>  	return 0;
> +
> +err_stop_dma:
> +	dmaengine_terminate_all(adc->dma_chan);
> +
> +	return ret;
> +}
> +
> +static void stm32_dfsdm_adc_dma_stop(struct iio_dev *indio_dev)
> +{
> +	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> +
> +	if (!adc->dma_chan)
> +		return;
> +
> +	regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR1(adc->fl_id),
> +			   DFSDM_CR1_RDMAEN_MASK, 0);
> +	dmaengine_terminate_all(adc->dma_chan);
>  }
>  
>  static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
> @@ -623,24 +625,22 @@ static int stm32_dfsdm_postenable(struct iio_dev *indio_dev)
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = stm32_dfsdm_start_conv(adc, chan, true);
> +	ret = stm32_dfsdm_adc_dma_start(indio_dev);
>  	if (ret) {
> -		dev_err(&indio_dev->dev, "Can't start conversion\n");
> +		dev_err(&indio_dev->dev, "Can't start DMA\n");
>  		goto stop_dfsdm;
>  	}
>  
> -	if (adc->dma_chan) {
> -		ret = stm32_dfsdm_adc_dma_start(indio_dev);
> -		if (ret) {
> -			dev_err(&indio_dev->dev, "Can't start DMA\n");
> -			goto err_stop_conv;
> -		}
> +	ret = stm32_dfsdm_start_conv(adc, chan);
> +	if (ret) {
> +		dev_err(&indio_dev->dev, "Can't start conversion\n");
> +		goto err_stop_dma;
>  	}
>  
>  	return 0;
>  
> -err_stop_conv:
> -	stm32_dfsdm_stop_conv(adc, chan);
> +err_stop_dma:
> +	stm32_dfsdm_adc_dma_stop(indio_dev);
>  stop_dfsdm:
>  	stm32_dfsdm_stop_dfsdm(adc->dfsdm);
>  
> @@ -652,11 +652,10 @@ 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, chan);
>  
> +	stm32_dfsdm_adc_dma_stop(indio_dev);
> +
>  	stm32_dfsdm_stop_dfsdm(adc->dfsdm);
>  
>  	return 0;
> @@ -736,7 +735,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev,
>  	if (ret < 0)
>  		goto stop_dfsdm;
>  
> -	ret = stm32_dfsdm_start_conv(adc, chan, false);
> +	ret = stm32_dfsdm_start_conv(adc, chan);
>  	if (ret < 0) {
>  		regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id),
>  				   DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(0));

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