[PATCH V3] DMA: PL330: Add check if device tree compatible

[PATCH V3] DMA: PL330: Add check if device tree compatible

[Padmavathi Venna]

This patch register the dma controller with generic dma helpers only
in DT case. This also adds some extra error handling in the driver.

Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Reported-by: Sachin Kamat <sachin.kamat@linaro.org>
---

Based on Vinod Koul next branch.

Changes since V2:
	- Removed pl330_free_chan_resources for error handling in probe. 

Changes since V1:
	- return silently when of_dma_controller_register fails, as
	  suggested by Arnd.

 drivers/dma/pl330.c |   33 ++++++++++++++++++++++-----------
 1 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 345e2a1..fa388c1c 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2882,7 +2882,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	struct dma_pl330_platdata *pdat;
 	struct dma_pl330_dmac *pdmac;
-	struct dma_pl330_chan *pch;
+	struct dma_pl330_chan *pch, *_p;
 	struct pl330_info *pi;
 	struct dma_device *pd;
 	struct resource *res;
@@ -2984,7 +2984,17 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 	ret = dma_async_device_register(pd);
 	if (ret) {
 		dev_err(&adev->dev, "unable to register DMAC\n");
-		goto probe_err2;
+		goto probe_err3;
+	}
+
+	if (adev->dev.of_node) {
+		ret = of_dma_controller_register(adev->dev.of_node,
+					 of_dma_pl330_xlate, pdmac);
+		if (ret) {
+			dev_err(&adev->dev,
+				"unable to register DMA to the generic"
+				"DT DMA helpers\n");
+		}
 	}
 
 	dev_info(&adev->dev,
@@ -2995,16 +3005,15 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 		pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan,
 		pi->pcfg.num_peri, pi->pcfg.num_events);
 
-	ret = of_dma_controller_register(adev->dev.of_node,
-					 of_dma_pl330_xlate, pdmac);
-	if (ret) {
-		dev_err(&adev->dev,
-		"unable to register DMA to the generic DT DMA helpers\n");
-		goto probe_err2;
-	}
-
 	return 0;
+probe_err3:
+	amba_set_drvdata(adev, NULL);
 
+	/* Idle the DMAC */
+	list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels,
+			chan.device_node)
+		/* Remove the channel */
+		list_del(&pch->chan.device_node);
 probe_err2:
 	pl330_del(pi);
 probe_err1:
@@ -3023,8 +3032,10 @@ static int pl330_remove(struct amba_device *adev)
 	if (!pdmac)
 		return 0;
 
-	of_dma_controller_free(adev->dev.of_node);
+	if (adev->dev.of_node)
+		of_dma_controller_free(adev->dev.of_node);
 
+	dma_async_device_unregister(&pdmac->ddma);
 	amba_set_drvdata(adev, NULL);
 
 	/* Idle the DMAC */
-- 
1.7.4.4

Re: [PATCH V3] DMA: PL330: Add check if device tree compatible

[Vinod Koul]

On Tue, Apr 02, 2013 at 04:46:45PM +0530, Padmavathi Venna wrote:
> This patch register the dma controller with generic dma helpers only
> in DT case. This also adds some extra error handling in the driver.
> 
> Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
> Reported-by: Sachin Kamat <sachin.kamat@linaro.org>
> ---
> 
> Based on Vinod Koul next branch.
> 
> Changes since V2:
> 	- Removed pl330_free_chan_resources for error handling in probe. 
> 
> Changes since V1:
> 	- return silently when of_dma_controller_register fails, as
> 	  suggested by Arnd.
> 
>  drivers/dma/pl330.c |   33 ++++++++++++++++++++++-----------
>  1 files changed, 22 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index 345e2a1..fa388c1c 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -2882,7 +2882,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  {
>  	struct dma_pl330_platdata *pdat;
>  	struct dma_pl330_dmac *pdmac;
> -	struct dma_pl330_chan *pch;
> +	struct dma_pl330_chan *pch, *_p;
>  	struct pl330_info *pi;
>  	struct dma_device *pd;
>  	struct resource *res;
> @@ -2984,7 +2984,17 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  	ret = dma_async_device_register(pd);
>  	if (ret) {
>  		dev_err(&adev->dev, "unable to register DMAC\n");
> -		goto probe_err2;
> +		goto probe_err3;
> +	}
> +
> +	if (adev->dev.of_node) {
> +		ret = of_dma_controller_register(adev->dev.of_node,
> +					 of_dma_pl330_xlate, pdmac);
> +		if (ret) {
> +			dev_err(&adev->dev,
> +				"unable to register DMA to the generic"
> +				"DT DMA helpers\n");
This could have been in a single line

I have applied it to fixes.

--
~Vinod
> +		}
>  	}
>  
>  	dev_info(&adev->dev,
> @@ -2995,16 +3005,15 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  		pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan,
>  		pi->pcfg.num_peri, pi->pcfg.num_events);
>  
> -	ret = of_dma_controller_register(adev->dev.of_node,
> -					 of_dma_pl330_xlate, pdmac);
> -	if (ret) {
> -		dev_err(&adev->dev,
> -		"unable to register DMA to the generic DT DMA helpers\n");
> -		goto probe_err2;
> -	}
> -
>  	return 0;
> +probe_err3:
> +	amba_set_drvdata(adev, NULL);
>  
> +	/* Idle the DMAC */
> +	list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels,
> +			chan.device_node)
> +		/* Remove the channel */
> +		list_del(&pch->chan.device_node);
>  probe_err2:
>  	pl330_del(pi);
>  probe_err1:
> @@ -3023,8 +3032,10 @@ static int pl330_remove(struct amba_device *adev)
>  	if (!pdmac)
>  		return 0;
>  
> -	of_dma_controller_free(adev->dev.of_node);
> +	if (adev->dev.of_node)
> +		of_dma_controller_free(adev->dev.of_node);
>  
> +	dma_async_device_unregister(&pdmac->ddma);
>  	amba_set_drvdata(adev, NULL);
>  
>  	/* Idle the DMAC */
> -- 
> 1.7.4.4
>