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[PATCH 0/5] [media] Create pads links after entities registration

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  [PATCH 0/5] [media] Create pads links after entities registration Javier Martinez Canillas <javier@osg.samsung.com> - 2015-09-03 18:10 +0200
    [PATCH 3/5] [media] v4l: vsp1: separate links creation from entities init Javier Martinez Canillas <javier@osg.samsung.com> - 2015-09-03 18:10 +0200
    [PATCH 4/5] [media] uvcvideo: create pad links after subdev registration Javier Martinez Canillas <javier@osg.samsung.com> - 2015-09-03 18:10 +0200

#1218407 — [PATCH 0/5] [media] Create pads links after entities registration

Hello,

This series changes all the MC media drivers that are currently creating
pads links before registering the media entities with the media device.

The patches are similar to the ones posted for the OMAP3 ISP driver [0]
and depends on Mauro's "[PATCH v8 00/55] MC next generation patches" [1].

The patches just moves the entities registration logic before pads links
creation and in the case of the vsp1, split the pads links creationg from
the entities initialization logic as it was made for the OMAP3 ISP driver.

Unfortunately I don't have hardware to test these patches and they were
only build tested. So testing that I didn't introduce any regression will
be highly appreciated.

[0]: https://lkml.org/lkml/2015/8/26/453
[1]: http://www.spinics.net/lists/linux-samsung-soc/msg47089.html

Best regards,
Javier


Javier Martinez Canillas (5):
  [media] staging: omap4iss: separate links creation from entities init
  [media] v4l: vsp1: create pad links after subdev registration
  [media] v4l: vsp1: separate links creation from entities init
  [media] uvcvideo: create pad links after subdev registration
  [media] smiapp: create pad links after subdev registration

 drivers/media/i2c/smiapp/smiapp-core.c       |  20 +++---
 drivers/media/platform/vsp1/vsp1_drv.c       |  30 +++++---
 drivers/media/platform/vsp1/vsp1_rpf.c       |  29 +++++---
 drivers/media/platform/vsp1/vsp1_rwpf.h      |   5 ++
 drivers/media/platform/vsp1/vsp1_wpf.c       |  40 +++++++----
 drivers/media/usb/uvc/uvc_entity.c           |  16 +++--
 drivers/staging/media/omap4iss/iss.c         | 101 ++++++++++++++++++---------
 drivers/staging/media/omap4iss/iss_csi2.c    |  35 +++++++---
 drivers/staging/media/omap4iss/iss_csi2.h    |   1 +
 drivers/staging/media/omap4iss/iss_ipipeif.c |  29 ++++----
 drivers/staging/media/omap4iss/iss_ipipeif.h |   1 +
 drivers/staging/media/omap4iss/iss_resizer.c |  29 ++++----
 drivers/staging/media/omap4iss/iss_resizer.h |   1 +
 13 files changed, 224 insertions(+), 113 deletions(-)

-- 
2.4.3

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#1218409 — [PATCH 3/5] [media] v4l: vsp1: separate links creation from entities init

The vsp1 driver initializes the entities and creates the pads links
before the entities are registered with the media device. This doesn't
work now that object IDs are used to create links so the media_device
has to be set.

Split out the pads links creation from the entity initialization so are
made after the entities registration.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
---

 drivers/media/platform/vsp1/vsp1_drv.c  | 14 ++++++++++--
 drivers/media/platform/vsp1/vsp1_rpf.c  | 29 ++++++++++++++++--------
 drivers/media/platform/vsp1/vsp1_rwpf.h |  5 +++++
 drivers/media/platform/vsp1/vsp1_wpf.c  | 40 ++++++++++++++++++++-------------
 4 files changed, 62 insertions(+), 26 deletions(-)

diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
index 2aa427d3ff39..8f995d267646 100644
--- a/drivers/media/platform/vsp1/vsp1_drv.c
+++ b/drivers/media/platform/vsp1/vsp1_drv.c
@@ -260,9 +260,19 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
 
 	/* Create links. */
 	list_for_each_entry(entity, &vsp1->entities, list_dev) {
-		if (entity->type == VSP1_ENTITY_LIF ||
-		    entity->type == VSP1_ENTITY_RPF)
+		if (entity->type == VSP1_ENTITY_LIF) {
+			ret = vsp1_wpf_create_pads_links(vsp1, entity);
+			if (ret < 0)
+				goto done;
+			continue;
+		}
+
+		if (entity->type == VSP1_ENTITY_RPF) {
+			ret = vsp1_rpf_create_pads_links(vsp1, entity);
+			if (ret < 0)
+				goto done;
 			continue;
+		}
 
 		ret = vsp1_create_links(vsp1, entity);
 		if (ret < 0)
diff --git a/drivers/media/platform/vsp1/vsp1_rpf.c b/drivers/media/platform/vsp1/vsp1_rpf.c
index b60a528a8fe8..38aebdf691b5 100644
--- a/drivers/media/platform/vsp1/vsp1_rpf.c
+++ b/drivers/media/platform/vsp1/vsp1_rpf.c
@@ -277,18 +277,29 @@ struct vsp1_rwpf *vsp1_rpf_create(struct vsp1_device *vsp1, unsigned int index)
 
 	rpf->entity.video = video;
 
-	/* Connect the video device to the RPF. */
-	ret = media_create_pad_link(&rpf->video.video.entity, 0,
-				       &rpf->entity.subdev.entity,
-				       RWPF_PAD_SINK,
-				       MEDIA_LNK_FL_ENABLED |
-				       MEDIA_LNK_FL_IMMUTABLE);
-	if (ret < 0)
-		goto error;
-
 	return rpf;
 
 error:
 	vsp1_entity_destroy(&rpf->entity);
 	return ERR_PTR(ret);
 }
+
+/*
+ * vsp1_rpf_create_pads_links_create_pads_links() - RPF pads links creation
+ * @vsp1: Pointer to VSP1 device
+ * @entity: Pointer to VSP1 entity
+ *
+ * return negative error code or zero on success
+ */
+int vsp1_rpf_create_pads_links(struct vsp1_device *vsp1,
+			       struct vsp1_entity *entity)
+{
+	struct vsp1_rwpf *rpf = to_rwpf(&entity->subdev);
+
+	/* Connect the video device to the RPF. */
+	return media_create_pad_link(&rpf->video.video.entity, 0,
+				     &rpf->entity.subdev.entity,
+				     RWPF_PAD_SINK,
+				     MEDIA_LNK_FL_ENABLED |
+				     MEDIA_LNK_FL_IMMUTABLE);
+}
diff --git a/drivers/media/platform/vsp1/vsp1_rwpf.h b/drivers/media/platform/vsp1/vsp1_rwpf.h
index f452dce1a931..6638b3587369 100644
--- a/drivers/media/platform/vsp1/vsp1_rwpf.h
+++ b/drivers/media/platform/vsp1/vsp1_rwpf.h
@@ -50,6 +50,11 @@ static inline struct vsp1_rwpf *to_rwpf(struct v4l2_subdev *subdev)
 struct vsp1_rwpf *vsp1_rpf_create(struct vsp1_device *vsp1, unsigned int index);
 struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index);
 
+int vsp1_rpf_create_pads_links(struct vsp1_device *vsp1,
+			       struct vsp1_entity *entity);
+int vsp1_wpf_create_pads_links(struct vsp1_device *vsp1,
+			       struct vsp1_entity *entity);
+
 int vsp1_rwpf_enum_mbus_code(struct v4l2_subdev *subdev,
 			     struct v4l2_subdev_pad_config *cfg,
 			     struct v4l2_subdev_mbus_code_enum *code);
diff --git a/drivers/media/platform/vsp1/vsp1_wpf.c b/drivers/media/platform/vsp1/vsp1_wpf.c
index d39aa4b8aea1..1be363e4f741 100644
--- a/drivers/media/platform/vsp1/vsp1_wpf.c
+++ b/drivers/media/platform/vsp1/vsp1_wpf.c
@@ -220,7 +220,6 @@ struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
 	struct v4l2_subdev *subdev;
 	struct vsp1_video *video;
 	struct vsp1_rwpf *wpf;
-	unsigned int flags;
 	int ret;
 
 	wpf = devm_kzalloc(vsp1->dev, sizeof(*wpf), GFP_KERNEL);
@@ -276,20 +275,6 @@ struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
 		goto error;
 
 	wpf->entity.video = video;
-
-	/* Connect the video device to the WPF. All connections are immutable
-	 * except for the WPF0 source link if a LIF is present.
-	 */
-	flags = MEDIA_LNK_FL_ENABLED;
-	if (!(vsp1->pdata.features & VSP1_HAS_LIF) || index != 0)
-		flags |= MEDIA_LNK_FL_IMMUTABLE;
-
-	ret = media_create_pad_link(&wpf->entity.subdev.entity,
-				       RWPF_PAD_SOURCE,
-				       &wpf->video.video.entity, 0, flags);
-	if (ret < 0)
-		goto error;
-
 	wpf->entity.sink = &wpf->video.video.entity;
 
 	return wpf;
@@ -298,3 +283,28 @@ error:
 	vsp1_entity_destroy(&wpf->entity);
 	return ERR_PTR(ret);
 }
+
+/*
+ * vsp1_wpf_create_pads_links_create_pads_links() - RPF pads links creation
+ * @vsp1: Pointer to VSP1 device
+ * @entity: Pointer to VSP1 entity
+ *
+ * return negative error code or zero on success
+ */
+int vsp1_wpf_create_pads_links(struct vsp1_device *vsp1,
+			       struct vsp1_entity *entity)
+{
+	struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
+	unsigned int flags;
+
+	/* Connect the video device to the WPF. All connections are immutable
+	 * except for the WPF0 source link if a LIF is present.
+	 */
+	flags = MEDIA_LNK_FL_ENABLED;
+	if (!(vsp1->pdata.features & VSP1_HAS_LIF) || entity->index != 0)
+		flags |= MEDIA_LNK_FL_IMMUTABLE;
+
+	return media_create_pad_link(&wpf->entity.subdev.entity,
+				     RWPF_PAD_SOURCE,
+				     &wpf->video.video.entity, 0, flags);
+}
-- 
2.4.3

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#1218414 — [PATCH 4/5] [media] uvcvideo: create pad links after subdev registration

The uvc driver creates the pads links before the media entity is
registered with the media device. This doesn't work now that obj
IDs are used to create links so the media_device has to be set.

Move entities registration logic before pads links creation.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
---

 drivers/media/usb/uvc/uvc_entity.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c
index 429e428ccd93..9dde1f86cc4b 100644
--- a/drivers/media/usb/uvc/uvc_entity.c
+++ b/drivers/media/usb/uvc/uvc_entity.c
@@ -37,6 +37,10 @@ static int uvc_mc_register_entity(struct uvc_video_chain *chain,
 	if (sink == NULL)
 		return 0;
 
+	ret = v4l2_device_register_subdev(&chain->dev->vdev, &entity->subdev);
+	if (ret < 0)
+		return ret;
+
 	for (i = 0; i < entity->num_pads; ++i) {
 		struct media_entity *source;
 		struct uvc_entity *remote;
@@ -46,8 +50,10 @@ static int uvc_mc_register_entity(struct uvc_video_chain *chain,
 			continue;
 
 		remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]);
-		if (remote == NULL)
-			return -EINVAL;
+		if (remote == NULL) {
+			ret = -EINVAL;
+			goto error;
+		}
 
 		source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
 		       ? (remote->vdev ? &remote->vdev->entity : NULL)
@@ -59,13 +65,15 @@ static int uvc_mc_register_entity(struct uvc_video_chain *chain,
 		ret = media_create_pad_link(source, remote_pad,
 					       sink, i, flags);
 		if (ret < 0)
-			return ret;
+			goto error;
 	}
 
 	if (UVC_ENTITY_TYPE(entity) == UVC_TT_STREAMING)
 		return 0;
 
-	return v4l2_device_register_subdev(&chain->dev->vdev, &entity->subdev);
+error:
+	v4l2_device_unregister_subdev(&entity->subdev);
+	return ret;
 }
 
 static struct v4l2_subdev_ops uvc_subdev_ops = {
-- 
2.4.3

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