[v2,4/8] iio: adc: stm32-dfsdm: move dma slave config to start routine
diff mbox series

Message ID 1553186849-6261-5-git-send-email-fabrice.gasnier@st.com
State New, archived
Headers show
Series
  • iio: adc: stm32-dfsdm: add buffer modes
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Commit Message

Fabrice Gasnier March 21, 2019, 4:47 p.m. UTC
Move DMA slave configuration to start routine: depending on regular or
injected mode is in use, DMA needs to read resp. RDATAR or JDATAR.
This is precursor patch to introduce injected mode (used for scan).

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 drivers/iio/adc/stm32-dfsdm-adc.c | 31 +++++++++++--------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

Comments

Jonathan Cameron March 24, 2019, 4:45 p.m. UTC | #1
On Thu, 21 Mar 2019 17:47:25 +0100
Fabrice Gasnier <fabrice.gasnier@st.com> wrote:

> Move DMA slave configuration to start routine: depending on regular or
> injected mode is in use, DMA needs to read resp. RDATAR or JDATAR.
> This is precursor patch to introduce injected mode (used for scan).
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>

Applied, thanks,

Jonathan
> ---
>  drivers/iio/adc/stm32-dfsdm-adc.c | 31 +++++++++++--------------------
>  1 file changed, 11 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 818627f..66e2ea0 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -556,6 +556,11 @@ static void stm32_dfsdm_audio_dma_buffer_done(void *data)
>  static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev)
>  {
>  	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> +	struct dma_slave_config config = {
> +		.src_addr = (dma_addr_t)adc->dfsdm->phys_base +
> +			DFSDM_RDATAR(adc->fl_id),
> +		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
> +	};
>  	struct dma_async_tx_descriptor *desc;
>  	dma_cookie_t cookie;
>  	int ret;
> @@ -566,6 +571,10 @@ static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev)
>  	dev_dbg(&indio_dev->dev, "%s size=%d watermark=%d\n", __func__,
>  		adc->buf_sz, adc->buf_sz / 2);
>  
> +	ret = dmaengine_slave_config(adc->dma_chan, &config);
> +	if (ret)
> +		return ret;
> +
>  	/* Prepare a DMA cyclic transaction */
>  	desc = dmaengine_prep_dma_cyclic(adc->dma_chan,
>  					 adc->dma_buf,
> @@ -925,12 +934,6 @@ static void stm32_dfsdm_dma_release(struct iio_dev *indio_dev)
>  static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev)
>  {
>  	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> -	struct dma_slave_config config = {
> -		.src_addr = (dma_addr_t)adc->dfsdm->phys_base +
> -			DFSDM_RDATAR(adc->fl_id),
> -		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
> -	};
> -	int ret;
>  
>  	adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx");
>  	if (!adc->dma_chan)
> @@ -940,23 +943,11 @@ static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev)
>  					 DFSDM_DMA_BUFFER_SIZE,
>  					 &adc->dma_buf, GFP_KERNEL);
>  	if (!adc->rx_buf) {
> -		ret = -ENOMEM;
> -		goto err_release;
> +		dma_release_channel(adc->dma_chan);
> +		return -ENOMEM;
>  	}
>  
> -	ret = dmaengine_slave_config(adc->dma_chan, &config);
> -	if (ret)
> -		goto err_free;
> -
>  	return 0;
> -
> -err_free:
> -	dma_free_coherent(adc->dma_chan->device->dev, DFSDM_DMA_BUFFER_SIZE,
> -			  adc->rx_buf, adc->dma_buf);
> -err_release:
> -	dma_release_channel(adc->dma_chan);
> -
> -	return ret;
>  }
>  
>  static int stm32_dfsdm_adc_chan_init_one(struct iio_dev *indio_dev,

Patch
diff mbox series

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 818627f..66e2ea0 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -556,6 +556,11 @@  static void stm32_dfsdm_audio_dma_buffer_done(void *data)
 static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev)
 {
 	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
+	struct dma_slave_config config = {
+		.src_addr = (dma_addr_t)adc->dfsdm->phys_base +
+			DFSDM_RDATAR(adc->fl_id),
+		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+	};
 	struct dma_async_tx_descriptor *desc;
 	dma_cookie_t cookie;
 	int ret;
@@ -566,6 +571,10 @@  static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev)
 	dev_dbg(&indio_dev->dev, "%s size=%d watermark=%d\n", __func__,
 		adc->buf_sz, adc->buf_sz / 2);
 
+	ret = dmaengine_slave_config(adc->dma_chan, &config);
+	if (ret)
+		return ret;
+
 	/* Prepare a DMA cyclic transaction */
 	desc = dmaengine_prep_dma_cyclic(adc->dma_chan,
 					 adc->dma_buf,
@@ -925,12 +934,6 @@  static void stm32_dfsdm_dma_release(struct iio_dev *indio_dev)
 static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev)
 {
 	struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
-	struct dma_slave_config config = {
-		.src_addr = (dma_addr_t)adc->dfsdm->phys_base +
-			DFSDM_RDATAR(adc->fl_id),
-		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
-	};
-	int ret;
 
 	adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx");
 	if (!adc->dma_chan)
@@ -940,23 +943,11 @@  static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev)
 					 DFSDM_DMA_BUFFER_SIZE,
 					 &adc->dma_buf, GFP_KERNEL);
 	if (!adc->rx_buf) {
-		ret = -ENOMEM;
-		goto err_release;
+		dma_release_channel(adc->dma_chan);
+		return -ENOMEM;
 	}
 
-	ret = dmaengine_slave_config(adc->dma_chan, &config);
-	if (ret)
-		goto err_free;
-
 	return 0;
-
-err_free:
-	dma_free_coherent(adc->dma_chan->device->dev, DFSDM_DMA_BUFFER_SIZE,
-			  adc->rx_buf, adc->dma_buf);
-err_release:
-	dma_release_channel(adc->dma_chan);
-
-	return ret;
 }
 
 static int stm32_dfsdm_adc_chan_init_one(struct iio_dev *indio_dev,