diff mbox series

[04/11] rcar-vin: Improve reuse of parallel notifier

Message ID 20210413180253.2575451-5-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State Superseded
Delegated to: Kieran Bingham
Headers show
Series rcar-vin: Add r8a779a0 support | expand

Commit Message

Niklas Söderlund April 13, 2021, 6:02 p.m. UTC
In preparation for adding a new media graph layout move the code reuse
of the parallel notifier setup from probe directly to the current media
graph initialization function. This is needed as there will be no
parallel interface in the new graph layout.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/media/platform/rcar-vin/rcar-core.c | 48 ++++++++++-----------
 1 file changed, 22 insertions(+), 26 deletions(-)

Comments

Jacopo Mondi July 6, 2021, 4:51 p.m. UTC | #1
Hi Niklas,

On Tue, Apr 13, 2021 at 08:02:46PM +0200, Niklas Söderlund wrote:
> In preparation for adding a new media graph layout move the code reuse
> of the parallel notifier setup from probe directly to the current media
> graph initialization function. This is needed as there will be no
> parallel interface in the new graph layout.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
>  drivers/media/platform/rcar-vin/rcar-core.c | 48 ++++++++++-----------
>  1 file changed, 22 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> index da23d55aa72b7f0d..81574bf33116ad59 100644
> --- a/drivers/media/platform/rcar-vin/rcar-core.c
> +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> @@ -702,9 +702,8 @@ static int rvin_parallel_init(struct rvin_dev *vin)
>  	if (ret)
>  		return ret;
>
> -	/* If using mc, it's fine not to have any input registered. */
>  	if (!vin->parallel.asd)
> -		return vin->info->use_mc ? 0 : -ENODEV;
> +		return -ENODEV;

Nit: isn't it better to keep the error handling here ?

>
>  	vin_dbg(vin, "Found parallel subdevice %pOF\n",
>  		to_of_node(vin->parallel.asd->match.fwnode));
> @@ -955,11 +954,9 @@ static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
>
>  static void rvin_csi2_cleanup(struct rvin_dev *vin)
>  {
> -	if (!vin->info->use_mc)
> -		return;
> -
>  	rvin_group_notifier_cleanup(vin);
>  	rvin_group_put(vin);
> +	rvin_free_controls(vin);
>  }
>
>  static int rvin_csi2_init(struct rvin_dev *vin)
> @@ -979,11 +976,18 @@ static int rvin_csi2_init(struct rvin_dev *vin)
>  	if (ret)
>  		goto err_controls;
>
> -	ret = rvin_mc_parse_of_graph(vin);
> -	if (ret)
> +	/* It's OK to not have a parallel subdevice. */
> +	ret = rvin_parallel_init(vin);
> +	if (ret && ret != -ENODEV)
>  		goto err_group;
>
> +	ret = rvin_mc_parse_of_graph(vin);
> +	if (ret)
> +		goto err_parallel;
> +
>  	return 0;
> +err_parallel:
> +	rvin_parallel_cleanup(vin);
>  err_group:
>  	rvin_group_put(vin);
>  err_controls:
> @@ -1469,27 +1473,20 @@ static int rcar_vin_probe(struct platform_device *pdev)
>
>  	platform_set_drvdata(pdev, vin);
>
> -	if (vin->info->use_mc) {
> +	if (vin->info->use_mc)
>  		ret = rvin_csi2_init(vin);
> -		if (ret)
> -			goto error_dma_unregister;
> -	}
> +	else
> +		ret = rvin_parallel_init(vin);
>
> -	ret = rvin_parallel_init(vin);
> -	if (ret)
> -		goto error_group_unregister;
> +	if (ret) {
> +		rvin_dma_unregister(vin);
> +		return ret;
> +	}
>
>  	pm_suspend_ignore_children(&pdev->dev, true);
>  	pm_runtime_enable(&pdev->dev);
>
>  	return 0;
> -error_group_unregister:
> -	rvin_free_controls(vin);
> -	rvin_csi2_cleanup(vin);
> -error_dma_unregister:
> -	rvin_dma_unregister(vin);
> -
> -	return ret;

This looks much much better and seems correct to me!

>  }
>
>  static int rcar_vin_remove(struct platform_device *pdev)
> @@ -1500,11 +1497,10 @@ static int rcar_vin_remove(struct platform_device *pdev)
>
>  	rvin_v4l2_unregister(vin);
>
> -	rvin_parallel_cleanup(vin);
> -
> -	rvin_csi2_cleanup(vin);
> -
> -	rvin_free_controls(vin);
> +	if (vin->info->use_mc)
> +		rvin_csi2_cleanup(vin);
> +	else
> +		rvin_parallel_cleanup(vin);

In the case use_mc == true but a parallel input was registered as well
this won't clean up the parallel notifier it seems.

Does it hurt to clean it up unconditionally ?

Thanks
  j
>
>  	rvin_dma_unregister(vin);
>
> --
> 2.31.1
>
Niklas Söderlund July 7, 2021, 8:51 a.m. UTC | #2
Hi Jacopo,

Thanks for your feedback.

On 2021-07-06 18:51:41 +0200, Jacopo Mondi wrote:
> Hi Niklas,
> 
> On Tue, Apr 13, 2021 at 08:02:46PM +0200, Niklas Söderlund wrote:
> > In preparation for adding a new media graph layout move the code reuse
> > of the parallel notifier setup from probe directly to the current media
> > graph initialization function. This is needed as there will be no
> > parallel interface in the new graph layout.
> >
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> > ---
> >  drivers/media/platform/rcar-vin/rcar-core.c | 48 ++++++++++-----------
> >  1 file changed, 22 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> > index da23d55aa72b7f0d..81574bf33116ad59 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-core.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> > @@ -702,9 +702,8 @@ static int rvin_parallel_init(struct rvin_dev *vin)
> >  	if (ret)
> >  		return ret;
> >
> > -	/* If using mc, it's fine not to have any input registered. */
> >  	if (!vin->parallel.asd)
> > -		return vin->info->use_mc ? 0 : -ENODEV;
> > +		return -ENODEV;
> 
> Nit: isn't it better to keep the error handling here ?

I'm trying to reduce the number of use_mc checks and if needed only keep 
it in code paths where it's relevant. I like moving it to the _csi2_ 
functions. But I agree _csi2_ is a bad prefix, it should likely be 
renamed somewhen in the future as it now really means _gen3_ minus v3u 
:-)

> 
> >
> >  	vin_dbg(vin, "Found parallel subdevice %pOF\n",
> >  		to_of_node(vin->parallel.asd->match.fwnode));
> > @@ -955,11 +954,9 @@ static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
> >
> >  static void rvin_csi2_cleanup(struct rvin_dev *vin)
> >  {
> > -	if (!vin->info->use_mc)
> > -		return;
> > -
> >  	rvin_group_notifier_cleanup(vin);
> >  	rvin_group_put(vin);
> > +	rvin_free_controls(vin);
> >  }
> >
> >  static int rvin_csi2_init(struct rvin_dev *vin)
> > @@ -979,11 +976,18 @@ static int rvin_csi2_init(struct rvin_dev *vin)
> >  	if (ret)
> >  		goto err_controls;
> >
> > -	ret = rvin_mc_parse_of_graph(vin);
> > -	if (ret)
> > +	/* It's OK to not have a parallel subdevice. */
> > +	ret = rvin_parallel_init(vin);
> > +	if (ret && ret != -ENODEV)
> >  		goto err_group;
> >
> > +	ret = rvin_mc_parse_of_graph(vin);
> > +	if (ret)
> > +		goto err_parallel;
> > +
> >  	return 0;
> > +err_parallel:
> > +	rvin_parallel_cleanup(vin);
> >  err_group:
> >  	rvin_group_put(vin);
> >  err_controls:
> > @@ -1469,27 +1473,20 @@ static int rcar_vin_probe(struct platform_device *pdev)
> >
> >  	platform_set_drvdata(pdev, vin);
> >
> > -	if (vin->info->use_mc) {
> > +	if (vin->info->use_mc)
> >  		ret = rvin_csi2_init(vin);
> > -		if (ret)
> > -			goto error_dma_unregister;
> > -	}
> > +	else
> > +		ret = rvin_parallel_init(vin);
> >
> > -	ret = rvin_parallel_init(vin);
> > -	if (ret)
> > -		goto error_group_unregister;
> > +	if (ret) {
> > +		rvin_dma_unregister(vin);
> > +		return ret;
> > +	}
> >
> >  	pm_suspend_ignore_children(&pdev->dev, true);
> >  	pm_runtime_enable(&pdev->dev);
> >
> >  	return 0;
> > -error_group_unregister:
> > -	rvin_free_controls(vin);
> > -	rvin_csi2_cleanup(vin);
> > -error_dma_unregister:
> > -	rvin_dma_unregister(vin);
> > -
> > -	return ret;
> 
> This looks much much better and seems correct to me!
> 
> >  }
> >
> >  static int rcar_vin_remove(struct platform_device *pdev)
> > @@ -1500,11 +1497,10 @@ static int rcar_vin_remove(struct platform_device *pdev)
> >
> >  	rvin_v4l2_unregister(vin);
> >
> > -	rvin_parallel_cleanup(vin);
> > -
> > -	rvin_csi2_cleanup(vin);
> > -
> > -	rvin_free_controls(vin);
> > +	if (vin->info->use_mc)
> > +		rvin_csi2_cleanup(vin);
> > +	else
> > +		rvin_parallel_cleanup(vin);
> 
> In the case use_mc == true but a parallel input was registered as well
> this won't clean up the parallel notifier it seems.

Good catch! rvin_parallel_cleanup() should be called from 
rvin_csi2_cleanup() as rvin_parallel_init() is called form 
rvin_csi2_init(). I will fix.

> 
> Does it hurt to clean it up unconditionally ?
> 
> Thanks
>   j
> >
> >  	rvin_dma_unregister(vin);
> >
> > --
> > 2.31.1
> >
diff mbox series

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index da23d55aa72b7f0d..81574bf33116ad59 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -702,9 +702,8 @@  static int rvin_parallel_init(struct rvin_dev *vin)
 	if (ret)
 		return ret;
 
-	/* If using mc, it's fine not to have any input registered. */
 	if (!vin->parallel.asd)
-		return vin->info->use_mc ? 0 : -ENODEV;
+		return -ENODEV;
 
 	vin_dbg(vin, "Found parallel subdevice %pOF\n",
 		to_of_node(vin->parallel.asd->match.fwnode));
@@ -955,11 +954,9 @@  static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
 
 static void rvin_csi2_cleanup(struct rvin_dev *vin)
 {
-	if (!vin->info->use_mc)
-		return;
-
 	rvin_group_notifier_cleanup(vin);
 	rvin_group_put(vin);
+	rvin_free_controls(vin);
 }
 
 static int rvin_csi2_init(struct rvin_dev *vin)
@@ -979,11 +976,18 @@  static int rvin_csi2_init(struct rvin_dev *vin)
 	if (ret)
 		goto err_controls;
 
-	ret = rvin_mc_parse_of_graph(vin);
-	if (ret)
+	/* It's OK to not have a parallel subdevice. */
+	ret = rvin_parallel_init(vin);
+	if (ret && ret != -ENODEV)
 		goto err_group;
 
+	ret = rvin_mc_parse_of_graph(vin);
+	if (ret)
+		goto err_parallel;
+
 	return 0;
+err_parallel:
+	rvin_parallel_cleanup(vin);
 err_group:
 	rvin_group_put(vin);
 err_controls:
@@ -1469,27 +1473,20 @@  static int rcar_vin_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, vin);
 
-	if (vin->info->use_mc) {
+	if (vin->info->use_mc)
 		ret = rvin_csi2_init(vin);
-		if (ret)
-			goto error_dma_unregister;
-	}
+	else
+		ret = rvin_parallel_init(vin);
 
-	ret = rvin_parallel_init(vin);
-	if (ret)
-		goto error_group_unregister;
+	if (ret) {
+		rvin_dma_unregister(vin);
+		return ret;
+	}
 
 	pm_suspend_ignore_children(&pdev->dev, true);
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
-error_group_unregister:
-	rvin_free_controls(vin);
-	rvin_csi2_cleanup(vin);
-error_dma_unregister:
-	rvin_dma_unregister(vin);
-
-	return ret;
 }
 
 static int rcar_vin_remove(struct platform_device *pdev)
@@ -1500,11 +1497,10 @@  static int rcar_vin_remove(struct platform_device *pdev)
 
 	rvin_v4l2_unregister(vin);
 
-	rvin_parallel_cleanup(vin);
-
-	rvin_csi2_cleanup(vin);
-
-	rvin_free_controls(vin);
+	if (vin->info->use_mc)
+		rvin_csi2_cleanup(vin);
+	else
+		rvin_parallel_cleanup(vin);
 
 	rvin_dma_unregister(vin);