[media] v4l: vsp1: Make the userspace API optional

The R-Car Gen3 SoCs include VSP instances dedicated to the DU that will
be controlled entirely by the rcar-du-drm driver through the KMS API. To
support that use case make the userspace V4L2 API optional.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vsp1/vsp1.h

@@ -50,6 +50,7 @@ struct vsp1_platform_data {
 	unsigned int uds_count;
 	unsigned int wpf_count;
 	unsigned int num_bru_inputs;
+	bool uapi;
 };
 
 struct vsp1_device {

drivers/media/platform/vsp1/vsp1_drv.c

@@ -143,6 +143,9 @@ static int vsp1_create_links(struct vsp1_device *vsp1)
 			return ret;
 	}
 
+	if (!vsp1->pdata.uapi)
+		return 0;
+
 	for (i = 0; i < vsp1->pdata.rpf_count; ++i) {
 		struct vsp1_rwpf *rpf = vsp1->rpf[i];
 
@@ -267,7 +270,6 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 	}
 
 	for (i = 0; i < vsp1->pdata.rpf_count; ++i) {
-		struct vsp1_video *video;
 		struct vsp1_rwpf *rpf;
 
 		rpf = vsp1_rpf_create(vsp1, i);
@@ -279,7 +281,9 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 		vsp1->rpf[i] = rpf;
 		list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
 
-		video = vsp1_video_create(vsp1, rpf);
+		if (vsp1->pdata.uapi) {
+			struct vsp1_video *video = vsp1_video_create(vsp1, rpf);
+
 			if (IS_ERR(video)) {
 				ret = PTR_ERR(video);
 				goto done;
@@ -287,6 +291,7 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 
 			list_add_tail(&video->list, &vsp1->videos);
 		}
+	}
 
 	if (vsp1->pdata.features & VSP1_HAS_SRU) {
 		vsp1->sru = vsp1_sru_create(vsp1);
@@ -312,7 +317,6 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 	}
 
 	for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
-		struct vsp1_video *video;
 		struct vsp1_rwpf *wpf;
 
 		wpf = vsp1_wpf_create(vsp1, i);
@@ -324,7 +328,9 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 		vsp1->wpf[i] = wpf;
 		list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
 
-		video = vsp1_video_create(vsp1, wpf);
+		if (vsp1->pdata.uapi) {
+			struct vsp1_video *video = vsp1_video_create(vsp1, wpf);
+
 			if (IS_ERR(video)) {
 				ret = PTR_ERR(video);
 				goto done;
@@ -333,6 +339,7 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 			list_add_tail(&video->list, &vsp1->videos);
 			wpf->entity.sink = &video->video.entity;
 		}
+	}
 
 	/* Register all subdevs. */
 	list_for_each_entry(entity, &vsp1->entities, list_dev) {
@@ -347,9 +354,11 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 	if (ret < 0)
 		goto done;
 
+	if (vsp1->pdata.uapi) {
 		ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
 		if (ret < 0)
 			goto done;
+	}
 
 	ret = media_device_register(mdev);
 
@@ -545,6 +554,7 @@ static int vsp1_parse_dt(struct vsp1_device *vsp1)
 
 	pdata->features |= VSP1_HAS_BRU;
 	pdata->num_bru_inputs = 4;
+	pdata->uapi = true;
 
 	return 0;
 }

drivers/media/platform/vsp1/vsp1_entity.c

@@ -45,7 +45,7 @@ int vsp1_entity_set_streaming(struct vsp1_entity *entity, bool streaming)
 	if (!streaming)
 		return 0;
 
-	if (!entity->subdev.ctrl_handler)
+	if (!entity->vsp1->pdata.uapi || !entity->subdev.ctrl_handler)
 		return 0;
 
 	ret = v4l2_ctrl_handler_setup(entity->subdev.ctrl_handler);

drivers/media/platform/vsp1/vsp1_sru.c

@@ -151,10 +151,12 @@ static int sru_s_stream(struct v4l2_subdev *subdev, int enable)
 	/* Take the control handler lock to ensure that the CTRL0 value won't be
 	 * changed behind our back by a set control operation.
 	 */
+	if (sru->entity.vsp1->pdata.uapi)
 		mutex_lock(sru->ctrls.lock);
 	ctrl0 |= vsp1_sru_read(sru, VI6_SRU_CTRL0)
 	       & (VI6_SRU_CTRL0_PARAM0_MASK | VI6_SRU_CTRL0_PARAM1_MASK);
 	vsp1_sru_write(sru, VI6_SRU_CTRL0, ctrl0);
+	if (sru->entity.vsp1->pdata.uapi)
 		mutex_unlock(sru->ctrls.lock);
 
 	vsp1_sru_write(sru, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);

drivers/media/platform/vsp1/vsp1_wpf.c

@@ -151,9 +151,11 @@ static int wpf_s_stream(struct v4l2_subdev *subdev, int enable)
 	/* Take the control handler lock to ensure that the PDV value won't be
 	 * changed behind our back by a set control operation.
 	 */
+	if (vsp1->pdata.uapi)
 		mutex_lock(wpf->ctrls.lock);
 	outfmt |= vsp1_wpf_read(wpf, VI6_WPF_OUTFMT) & VI6_WPF_OUTFMT_PDV_MASK;
 	vsp1_wpf_write(wpf, VI6_WPF_OUTFMT, outfmt);
+	if (vsp1->pdata.uapi)
 		mutex_unlock(wpf->ctrls.lock);
 
 	vsp1_write(vsp1, VI6_DPR_WPF_FPORCH(wpf->entity.index),