Em Tue, 25 Aug 2015 11:23:24 +0200
Hans Verkuil <hverkuil@xxxxxxxxx> escreveu:
> On 08/23/15 22:17, Mauro Carvalho Chehab wrote:
> > Now that interfaces and entities are distinct, it makes no sense
> > of keeping something named as MEDIA_ENT_T_DEVNODE.
> >
> > This change was done with this script:
> >
> > for i in $(git grep -l MEDIA_ENT_T|grep -v uapi/linux/media.h); do sed s,MEDIA_ENT_T_DEVNODE_V4L,MEDIA_ENT_T_V4L2_VIDEO, <$i >a && mv a $i; done
> >
> > Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
> >
> > diff --git a/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml b/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml
> > index 5872f8bbf774..910243d4edb8 100644
> > --- a/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml
> > +++ b/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml
> > @@ -183,7 +183,7 @@
> > <entry>Unknown device node</entry>
> > </row>
> > <row>
> > - <entry><constant>MEDIA_ENT_T_DEVNODE_V4L</constant></entry>
> > + <entry><constant>MEDIA_ENT_T_V4L2_VIDEO</constant></entry>
> > <entry>V4L video, radio or vbi device node</entry>
> > </row>
>
> OK, this makes no sense and that ties in with my confusion of the previous patch.
>
> These are not device nodes, in the new scheme these are DMA entities (I know,
> naming TDB) that have an associated interface.
Yes. Well, DMA is a bad name. It won't cover USB devices, where the DMA
engine is outside the V4L2 drivers, nor it would work for RDS radio data,
with may not need any DMA at all on no-USB devices, as the data flows via
the I2C bus.
> I think a much better approach would be to add entity type(s) for such DMA
> engines in patch 24, then use that new name in existing drivers and split
> up the existing DEVNODE_V4L media_entity into a media_entity and a
> media_intf_devnode:
Sorry, but I didn't get. That's precisely what I did ;)
> The current media_entity defined in struct video_device has to be replaced
> by media_intf_devnode, and the DMA entity has to be added as a new entity
> to these drivers.
If I do this way, it would break bisectability. I need first to replace
the names, but keep them as entities, and then add the interfaces.
>
> This reflects these two action items from our meeting:
>
> Migration: add v4l-subdev media_interface: Laurent
> Migration: add explicit DMA Engine entity: Laurent
>
> Unless Laurent says differently I think this is something you'll have to
> do given Laurent's workload.
Yes. The above action items are covered on this series.
What patch 24 does is to define the new namespace, moving the legacy
symbols kept due to backward compatibility on a separate part of the
header.
Then, patches 25-38 replace the occurrences of the deprecated names
by the new ones.
Nothing is touched at the interfaces yet, to avoid breaking bisectability.
Then, the next patches add interfaces support at the V4L side.
> I think doing this at this stage of the patch series is crucial, otherwise
> the remaining patches really make no sense.
>
> I'll skip reviewing patches 26-38 for now.
>
> Regards,
>
> Hans
>
> > <row>
> > diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
> > index 92e8116dc28f..88cd789cdaf7 100644
> > --- a/drivers/media/platform/xilinx/xilinx-dma.c
> > +++ b/drivers/media/platform/xilinx/xilinx-dma.c
> > @@ -193,7 +193,7 @@ static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
> > while ((entity = media_entity_graph_walk_next(&graph))) {
> > struct xvip_dma *dma;
> >
> > - if (entity->type != MEDIA_ENT_T_DEVNODE_V4L)
> > + if (entity->type != MEDIA_ENT_T_V4L2_VIDEO)
> > continue;
> >
> > dma = to_xvip_dma(media_entity_to_video_device(entity));
> > diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> > index 71a1b93b0790..44b330589787 100644
> > --- a/drivers/media/v4l2-core/v4l2-dev.c
> > +++ b/drivers/media/v4l2-core/v4l2-dev.c
> > @@ -912,7 +912,7 @@ int __video_register_device(struct video_device *vdev, int type, int nr,
> > /* Part 5: Register the entity. */
> > if (vdev->v4l2_dev->mdev &&
> > vdev->vfl_type != VFL_TYPE_SUBDEV) {
> > - vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
> > + vdev->entity.type = MEDIA_ENT_T_V4L2_VIDEO;
> > vdev->entity.name = vdev->name;
> > vdev->entity.info.dev.major = VIDEO_MAJOR;
> > vdev->entity.info.dev.minor = vdev->minor;
> > diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> > index 83615b8fb46a..e6e1115d8215 100644
> > --- a/drivers/media/v4l2-core/v4l2-subdev.c
> > +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> > @@ -535,7 +535,7 @@ v4l2_subdev_link_validate_get_format(struct media_pad *pad,
> > return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
> > }
> >
> > - WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L,
> > + WARN(pad->entity->type != MEDIA_ENT_T_V4L2_VIDEO,
> > "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
> > pad->entity->type, pad->entity->name);
> >
> >
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