Hi Hans,
On Thursday 21 May 2015 07:55:10 Hans Verkuil wrote:
> On 05/20/2015 06:39 PM, William Towle wrote:
> > Add detection of source pad number for drivers aware of the media
> > controller API, so that soc_camera/rcar_vin can create device nodes
> > to support a driver such as adv7604.c (for HDMI on Lager) underneath.
> >
> > Signed-off-by: William Towle <william.towle@xxxxxxxxxxxxxxx>
> > Reviewed-by: Rob Taylor <rob.taylor@xxxxxxxxxxxxxxx>
> > ---
> >
> > drivers/media/platform/soc_camera/rcar_vin.c | 4 ++++
> > drivers/media/platform/soc_camera/soc_camera.c | 27 ++++++++++++++++++-
> > include/media/soc_camera.h | 1 +
> > 3 files changed, 31 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/soc_camera/rcar_vin.c
> > b/drivers/media/platform/soc_camera/rcar_vin.c index 0f67646..b4e9b43
> > 100644
> > --- a/drivers/media/platform/soc_camera/rcar_vin.c
> > +++ b/drivers/media/platform/soc_camera/rcar_vin.c
> > @@ -1364,8 +1364,12 @@ static int rcar_vin_get_formats(struct
> > soc_camera_device *icd, unsigned int idx,
> > struct v4l2_mbus_framefmt *mf = &fmt.format;
> > struct v4l2_rect rect;
> > struct device *dev = icd->parent;
> > + struct media_pad *remote_pad;
> > int shift;
> >
> > + remote_pad = media_entity_remote_pad(
> > + &icd->vdev->entity.pads[0]);
> > + fmt.pad = remote_pad->index;
>
> This won't work if CONFIG_MEDIA_CONTROLLER isn't defined. All these media
> calls would all have to be under #ifdef CONFIG_MEDIA_CONTROLLER.
>
> Unfortunately, if it is not defined, then you still have no way of finding
> the source pad.
>
> Laurent, do you think if it would make sense to add a new subdev core op
> that will return the default source pad (I'm saying 'default' in case there
> are more) of a subdev? That way it can be used in non-MC drivers. We never
> needed the source pad before, but now we do, and this op only needs to be
> implemented if the default source pad != 0.
I'm not too fond of that. Is there something wrong with the method implemented
in this patch ? Is the dependency on CONFIG_MEDIA_CONTROLLER an issue ?
> > ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
> > if (ret < 0)
> > return ret;
> > diff --git a/drivers/media/platform/soc_camera/soc_camera.c
> > b/drivers/media/platform/soc_camera/soc_camera.c index d708df4..126d645
> > 100644
> > --- a/drivers/media/platform/soc_camera/soc_camera.c
> > +++ b/drivers/media/platform/soc_camera/soc_camera.c
> > @@ -1293,6 +1293,7 @@ static int soc_camera_probe_finish(struct
> > soc_camera_device *icd)
> > .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> > };
> > struct v4l2_mbus_framefmt *mf = &fmt.format;
> > + int src_pad_idx = -1;
> > int ret;
> >
> > sd->grp_id = soc_camera_grp_id(icd);
> > @@ -1311,7 +1312,25 @@ static int soc_camera_probe_finish(struct
> > soc_camera_device *icd)
> > }
> >
> > /* At this point client .probe() should have run already */
> > - ret = soc_camera_init_user_formats(icd);
> > + ret = media_entity_init(&icd->vdev->entity, 1, &icd->pad, 0);
> > + if (!ret) {
> > + for (src_pad_idx = 0; src_pad_idx < sd->entity.num_pads;
> > + src_pad_idx++)
> > + if (sd->entity.pads[src_pad_idx].flags
> > + == MEDIA_PAD_FL_SOURCE)
> > + break;
> > +
> > + if (src_pad_idx < sd->entity.num_pads) {
> > + if (!media_entity_create_link(
> > + &icd->vdev->entity, 0,
> > + &sd->entity, src_pad_idx,
> > + MEDIA_LNK_FL_IMMUTABLE |
> > + MEDIA_LNK_FL_ENABLED)) {
> > + ret = soc_camera_init_user_formats(icd);
> > + }
> > + }
> > + }
> > +
> > if (ret < 0)
> > goto eusrfmt;
> >
> > @@ -1322,6 +1341,7 @@ static int soc_camera_probe_finish(struct
> > soc_camera_device *icd)
> > goto evidstart;
> >
> > /* Try to improve our guess of a reasonable window format */
> > + fmt.pad = src_pad_idx;
> > if (!v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt)) {
> > icd->user_width = mf->width;
> > icd->user_height = mf->height;
> > @@ -1335,6 +1355,7 @@ static int soc_camera_probe_finish(struct
> > soc_camera_device *icd)
> > evidstart:
> > soc_camera_free_user_formats(icd);
> >
> > eusrfmt:
> > + media_entity_cleanup(&icd->vdev->entity);
> > soc_camera_remove_device(icd);
> >
> > return ret;
> > @@ -1856,6 +1877,10 @@ static int soc_camera_remove(struct
> > soc_camera_device *icd)>
> > if (icd->num_user_formats)
> > soc_camera_free_user_formats(icd);
> >
> > + if (icd->vdev->entity.num_pads) {
> > + media_entity_cleanup(&icd->vdev->entity);
> > + }
> > +
> > if (icd->clk) {
> > /* For the synchronous case */
> > v4l2_clk_unregister(icd->clk);
> > diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
> > index 2f6261f..f0c5238 100644
> > --- a/include/media/soc_camera.h
> > +++ b/include/media/soc_camera.h
> > @@ -42,6 +42,7 @@ struct soc_camera_device {
> > unsigned char devnum; /* Device number per host */
> > struct soc_camera_sense *sense; /* See comment in struct definition
> > */
> > struct video_device *vdev;
> > + struct media_pad pad;
> > struct v4l2_ctrl_handler ctrl_handler;
> > const struct soc_camera_format_xlate *current_fmt;
> > struct soc_camera_format_xlate *user_formats;
--
Regards,
Laurent Pinchart
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