LinuxTV Patchwork [2/3] rcar-vin: Add control for alpha component

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Submitter Niklas Söderlund
Date May 16, 2019, 12:47 a.m.
Message ID <20190516004746.3794-3-niklas.soderlund+renesas@ragnatech.se>
Download mbox | patch
Permalink /patch/56179/
State New
Delegated to: Hans Verkuil
Headers show

Comments

Niklas Söderlund - May 16, 2019, 12:47 a.m.
In preparation to adding support for RGB pixel formats with an alpha
component add a control to allow the user to control which alpha value
should be used.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/media/platform/rcar-vin/rcar-core.c | 53 ++++++++++++++++++++-
 drivers/media/platform/rcar-vin/rcar-dma.c  |  5 ++
 drivers/media/platform/rcar-vin/rcar-vin.h  |  5 ++
 3 files changed, 61 insertions(+), 2 deletions(-)
Laurent Pinchart - May 16, 2019, 10:01 a.m.
Hi Niklas,

Thank you for the patch.

On Thu, May 16, 2019 at 02:47:45AM +0200, Niklas Söderlund wrote:
> In preparation to adding support for RGB pixel formats with an alpha
> component add a control to allow the user to control which alpha value
> should be used.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
>  drivers/media/platform/rcar-vin/rcar-core.c | 53 ++++++++++++++++++++-
>  drivers/media/platform/rcar-vin/rcar-dma.c  |  5 ++
>  drivers/media/platform/rcar-vin/rcar-vin.h  |  5 ++
>  3 files changed, 61 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> index 64f9cf790445d14e..ee6e6cb39c749675 100644
> --- a/drivers/media/platform/rcar-vin/rcar-core.c
> +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> @@ -389,6 +389,28 @@ static void rvin_group_put(struct rvin_dev *vin)
>  	kref_put(&group->refcount, rvin_group_release);
>  }
>  
> +/* -----------------------------------------------------------------------------
> + * Controls
> + */
> +
> +static int rvin_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct rvin_dev *vin =
> +		container_of(ctrl->handler, struct rvin_dev, ctrl_handler);
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_ALPHA_COMPONENT:
> +		rvin_set_alpha(vin, ctrl->val);

You can set vin->alpha here directly, no need for a rvin_set_alpha()
function.

> +		break;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops rvin_ctrl_ops = {
> +	.s_ctrl = rvin_s_ctrl,
> +};
> +
>  /* -----------------------------------------------------------------------------
>   * Async notifier
>   */
> @@ -478,6 +500,15 @@ static int rvin_parallel_subdevice_attach(struct rvin_dev *vin,
>  	if (ret < 0)
>  		return ret;
>  
> +	v4l2_ctrl_new_std(&vin->ctrl_handler, &rvin_ctrl_ops,
> +			  V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 255);
> +
> +	if (vin->ctrl_handler.error) {
> +		ret = vin->ctrl_handler.error;
> +		v4l2_ctrl_handler_free(&vin->ctrl_handler);
> +		return ret;
> +	}
> +
>  	ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, subdev->ctrl_handler,
>  				    NULL, true);
>  	if (ret < 0) {
> @@ -870,6 +901,21 @@ static int rvin_mc_init(struct rvin_dev *vin)
>  	if (ret)
>  		rvin_group_put(vin);
>  
> +	ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 1);
> +	if (ret < 0)
> +		return ret;
> +
> +	v4l2_ctrl_new_std(&vin->ctrl_handler, &rvin_ctrl_ops,
> +			  V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 255);
> +
> +	if (vin->ctrl_handler.error) {
> +		ret = vin->ctrl_handler.error;
> +		v4l2_ctrl_handler_free(&vin->ctrl_handler);
> +		return ret;
> +	}
> +
> +	vin->vdev.ctrl_handler = &vin->ctrl_handler;
> +
>  	return ret;
>  }
>  
> @@ -1245,6 +1291,7 @@ static int rcar_vin_probe(struct platform_device *pdev)
>  
>  	vin->dev = &pdev->dev;
>  	vin->info = of_device_get_match_data(&pdev->dev);
> +	vin->alpha = 0xff;
>  
>  	/*
>  	 * Special care is needed on r8a7795 ES1.x since it
> @@ -1288,6 +1335,8 @@ static int rcar_vin_probe(struct platform_device *pdev)
>  	return 0;
>  
>  error_group_unregister:
> +	v4l2_ctrl_handler_free(&vin->ctrl_handler);
> +
>  	if (vin->info->use_mc) {
>  		mutex_lock(&vin->group->lock);
>  		if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) {
> @@ -1323,10 +1372,10 @@ static int rcar_vin_remove(struct platform_device *pdev)
>  		}
>  		mutex_unlock(&vin->group->lock);
>  		rvin_group_put(vin);
> -	} else {
> -		v4l2_ctrl_handler_free(&vin->ctrl_handler);
>  	}
>  
> +	v4l2_ctrl_handler_free(&vin->ctrl_handler);
> +
>  	rvin_dma_unregister(vin);
>  
>  	return 0;
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> index 2d146ecf93d66ad5..4e991cce5fb56a90 100644
> --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> @@ -1343,3 +1343,8 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
>  
>  	return 0;
>  }
> +
> +void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha)
> +{
> +	vin->alpha = alpha;
> +}
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
> index 0b13b34d03e3dce4..365dfde06ec25add 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -178,6 +178,8 @@ struct rvin_info {
>   * @compose:		active composing
>   * @source:		active size of the video source
>   * @std:		active video standard of the video source
> + *

Do you need a blank line here ?

Apart from that the patch looks good to me.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> + * @alpha:		Alpha component to fill in for supported pixel formats
>   */
>  struct rvin_dev {
>  	struct device *dev;
> @@ -215,6 +217,8 @@ struct rvin_dev {
>  	struct v4l2_rect compose;
>  	struct v4l2_rect source;
>  	v4l2_std_id std;
> +
> +	unsigned int alpha;
>  };
>  
>  #define vin_to_source(vin)		((vin)->parallel->subdev)
> @@ -266,5 +270,6 @@ const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);
>  void rvin_crop_scale_comp(struct rvin_dev *vin);
>  
>  int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel);
> +void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha);
>  
>  #endif
Niklas Söderlund - May 16, 2019, 1:04 p.m.
Hi Laurent,

Thanks for your feedback.

On 2019-05-16 13:01:38 +0300, Laurent Pinchart wrote:
> Hi Niklas,
> 
> Thank you for the patch.
> 
> On Thu, May 16, 2019 at 02:47:45AM +0200, Niklas Söderlund wrote:
> > In preparation to adding support for RGB pixel formats with an alpha
> > component add a control to allow the user to control which alpha value
> > should be used.
> > 
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> > ---
> >  drivers/media/platform/rcar-vin/rcar-core.c | 53 ++++++++++++++++++++-
> >  drivers/media/platform/rcar-vin/rcar-dma.c  |  5 ++
> >  drivers/media/platform/rcar-vin/rcar-vin.h  |  5 ++
> >  3 files changed, 61 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> > index 64f9cf790445d14e..ee6e6cb39c749675 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-core.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> > @@ -389,6 +389,28 @@ static void rvin_group_put(struct rvin_dev *vin)
> >  	kref_put(&group->refcount, rvin_group_release);
> >  }
> >  
> > +/* -----------------------------------------------------------------------------
> > + * Controls
> > + */
> > +
> > +static int rvin_s_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct rvin_dev *vin =
> > +		container_of(ctrl->handler, struct rvin_dev, ctrl_handler);
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_ALPHA_COMPONENT:
> > +		rvin_set_alpha(vin, ctrl->val);
> 
> You can set vin->alpha here directly, no need for a rvin_set_alpha()
> function.

I think you discovers the reason for this in 3/3. I could set vin->alpha 
directly here and introduce rvin_set_alpha() in 3/3. I opted for this 
approach as the reason form not margin 2/3 and 3/3 into a single patch 
is that I only want the register writes in 3/3.

> 
> > +		break;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_ctrl_ops rvin_ctrl_ops = {
> > +	.s_ctrl = rvin_s_ctrl,
> > +};
> > +
> >  /* -----------------------------------------------------------------------------
> >   * Async notifier
> >   */
> > @@ -478,6 +500,15 @@ static int rvin_parallel_subdevice_attach(struct rvin_dev *vin,
> >  	if (ret < 0)
> >  		return ret;
> >  
> > +	v4l2_ctrl_new_std(&vin->ctrl_handler, &rvin_ctrl_ops,
> > +			  V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 255);
> > +
> > +	if (vin->ctrl_handler.error) {
> > +		ret = vin->ctrl_handler.error;
> > +		v4l2_ctrl_handler_free(&vin->ctrl_handler);
> > +		return ret;
> > +	}
> > +
> >  	ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, subdev->ctrl_handler,
> >  				    NULL, true);
> >  	if (ret < 0) {
> > @@ -870,6 +901,21 @@ static int rvin_mc_init(struct rvin_dev *vin)
> >  	if (ret)
> >  		rvin_group_put(vin);
> >  
> > +	ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 1);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	v4l2_ctrl_new_std(&vin->ctrl_handler, &rvin_ctrl_ops,
> > +			  V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 255);
> > +
> > +	if (vin->ctrl_handler.error) {
> > +		ret = vin->ctrl_handler.error;
> > +		v4l2_ctrl_handler_free(&vin->ctrl_handler);
> > +		return ret;
> > +	}
> > +
> > +	vin->vdev.ctrl_handler = &vin->ctrl_handler;
> > +
> >  	return ret;
> >  }
> >  
> > @@ -1245,6 +1291,7 @@ static int rcar_vin_probe(struct platform_device *pdev)
> >  
> >  	vin->dev = &pdev->dev;
> >  	vin->info = of_device_get_match_data(&pdev->dev);
> > +	vin->alpha = 0xff;
> >  
> >  	/*
> >  	 * Special care is needed on r8a7795 ES1.x since it
> > @@ -1288,6 +1335,8 @@ static int rcar_vin_probe(struct platform_device *pdev)
> >  	return 0;
> >  
> >  error_group_unregister:
> > +	v4l2_ctrl_handler_free(&vin->ctrl_handler);
> > +
> >  	if (vin->info->use_mc) {
> >  		mutex_lock(&vin->group->lock);
> >  		if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) {
> > @@ -1323,10 +1372,10 @@ static int rcar_vin_remove(struct platform_device *pdev)
> >  		}
> >  		mutex_unlock(&vin->group->lock);
> >  		rvin_group_put(vin);
> > -	} else {
> > -		v4l2_ctrl_handler_free(&vin->ctrl_handler);
> >  	}
> >  
> > +	v4l2_ctrl_handler_free(&vin->ctrl_handler);
> > +
> >  	rvin_dma_unregister(vin);
> >  
> >  	return 0;
> > diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> > index 2d146ecf93d66ad5..4e991cce5fb56a90 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> > @@ -1343,3 +1343,8 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
> >  
> >  	return 0;
> >  }
> > +
> > +void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha)
> > +{
> > +	vin->alpha = alpha;
> > +}
> > diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
> > index 0b13b34d03e3dce4..365dfde06ec25add 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> > +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> > @@ -178,6 +178,8 @@ struct rvin_info {
> >   * @compose:		active composing
> >   * @source:		active size of the video source
> >   * @std:		active video standard of the video source
> > + *
> 
> Do you need a blank line here ?

I don't need it, but it make sens in my head on how I group variables in 
sturct rvin_info. There already exists blank lines in the structure for 
this grouping of variables thinking. If you are OK with it I would 
prefer to keep it, but I do not feel strongly about it.

> 
> Apart from that the patch looks good to me.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Thanks!

> 
> > + * @alpha:		Alpha component to fill in for supported pixel formats
> >   */
> >  struct rvin_dev {
> >  	struct device *dev;
> > @@ -215,6 +217,8 @@ struct rvin_dev {
> >  	struct v4l2_rect compose;
> >  	struct v4l2_rect source;
> >  	v4l2_std_id std;
> > +
> > +	unsigned int alpha;
> >  };
> >  
> >  #define vin_to_source(vin)		((vin)->parallel->subdev)
> > @@ -266,5 +270,6 @@ const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);
> >  void rvin_crop_scale_comp(struct rvin_dev *vin);
> >  
> >  int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel);
> > +void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha);
> >  
> >  #endif
> 
> -- 
> Regards,
> 
> Laurent Pinchart

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index 64f9cf790445d14e..ee6e6cb39c749675 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -389,6 +389,28 @@  static void rvin_group_put(struct rvin_dev *vin)
 	kref_put(&group->refcount, rvin_group_release);
 }
 
+/* -----------------------------------------------------------------------------
+ * Controls
+ */
+
+static int rvin_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct rvin_dev *vin =
+		container_of(ctrl->handler, struct rvin_dev, ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_ALPHA_COMPONENT:
+		rvin_set_alpha(vin, ctrl->val);
+		break;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops rvin_ctrl_ops = {
+	.s_ctrl = rvin_s_ctrl,
+};
+
 /* -----------------------------------------------------------------------------
  * Async notifier
  */
@@ -478,6 +500,15 @@  static int rvin_parallel_subdevice_attach(struct rvin_dev *vin,
 	if (ret < 0)
 		return ret;
 
+	v4l2_ctrl_new_std(&vin->ctrl_handler, &rvin_ctrl_ops,
+			  V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 255);
+
+	if (vin->ctrl_handler.error) {
+		ret = vin->ctrl_handler.error;
+		v4l2_ctrl_handler_free(&vin->ctrl_handler);
+		return ret;
+	}
+
 	ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, subdev->ctrl_handler,
 				    NULL, true);
 	if (ret < 0) {
@@ -870,6 +901,21 @@  static int rvin_mc_init(struct rvin_dev *vin)
 	if (ret)
 		rvin_group_put(vin);
 
+	ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 1);
+	if (ret < 0)
+		return ret;
+
+	v4l2_ctrl_new_std(&vin->ctrl_handler, &rvin_ctrl_ops,
+			  V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 255);
+
+	if (vin->ctrl_handler.error) {
+		ret = vin->ctrl_handler.error;
+		v4l2_ctrl_handler_free(&vin->ctrl_handler);
+		return ret;
+	}
+
+	vin->vdev.ctrl_handler = &vin->ctrl_handler;
+
 	return ret;
 }
 
@@ -1245,6 +1291,7 @@  static int rcar_vin_probe(struct platform_device *pdev)
 
 	vin->dev = &pdev->dev;
 	vin->info = of_device_get_match_data(&pdev->dev);
+	vin->alpha = 0xff;
 
 	/*
 	 * Special care is needed on r8a7795 ES1.x since it
@@ -1288,6 +1335,8 @@  static int rcar_vin_probe(struct platform_device *pdev)
 	return 0;
 
 error_group_unregister:
+	v4l2_ctrl_handler_free(&vin->ctrl_handler);
+
 	if (vin->info->use_mc) {
 		mutex_lock(&vin->group->lock);
 		if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) {
@@ -1323,10 +1372,10 @@  static int rcar_vin_remove(struct platform_device *pdev)
 		}
 		mutex_unlock(&vin->group->lock);
 		rvin_group_put(vin);
-	} else {
-		v4l2_ctrl_handler_free(&vin->ctrl_handler);
 	}
 
+	v4l2_ctrl_handler_free(&vin->ctrl_handler);
+
 	rvin_dma_unregister(vin);
 
 	return 0;
diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index 2d146ecf93d66ad5..4e991cce5fb56a90 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -1343,3 +1343,8 @@  int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
 
 	return 0;
 }
+
+void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha)
+{
+	vin->alpha = alpha;
+}
diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
index 0b13b34d03e3dce4..365dfde06ec25add 100644
--- a/drivers/media/platform/rcar-vin/rcar-vin.h
+++ b/drivers/media/platform/rcar-vin/rcar-vin.h
@@ -178,6 +178,8 @@  struct rvin_info {
  * @compose:		active composing
  * @source:		active size of the video source
  * @std:		active video standard of the video source
+ *
+ * @alpha:		Alpha component to fill in for supported pixel formats
  */
 struct rvin_dev {
 	struct device *dev;
@@ -215,6 +217,8 @@  struct rvin_dev {
 	struct v4l2_rect compose;
 	struct v4l2_rect source;
 	v4l2_std_id std;
+
+	unsigned int alpha;
 };
 
 #define vin_to_source(vin)		((vin)->parallel->subdev)
@@ -266,5 +270,6 @@  const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);
 void rvin_crop_scale_comp(struct rvin_dev *vin);
 
 int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel);
+void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha);
 
 #endif

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