Hi Hans,
Thank you for the patch.
On Thursday 04 December 2014 10:54:57 Hans Verkuil wrote:
> From: Hans Verkuil <hans.verk...@cisco.com>
>
> When a new subdevice is registered this new function is called to allocate
> and initialize a pad_config array. This allows bridge drivers to use the
> pad ops that require such an array as argument.
While I agree that a v4l2_subdev_create_pad_configs() function is needed, I
don't think the pad configs should be stored in the subdev structure. This
would defeat the whole point of having a try mechanism based on private
configs. Bridge drivers should instead create the configs on demand, use them,
and delete them afterwards.
> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
> ---
> drivers/media/v4l2-core/v4l2-device.c | 11 ++++++++++-
> drivers/media/v4l2-core/v4l2-subdev.c | 36 ++++++++++++++++++++++++++++++++
> include/media/v4l2-subdev.h | 4 ++++
> 3 files changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-device.c
> b/drivers/media/v4l2-core/v4l2-device.c index 015f92a..5c8d402 100644
> --- a/drivers/media/v4l2-core/v4l2-device.c
> +++ b/drivers/media/v4l2-core/v4l2-device.c
> @@ -183,12 +183,16 @@ int v4l2_device_register_subdev(struct v4l2_device
> *v4l2_dev, if (err)
> goto error_unregister;
>
> + err = v4l2_subdev_create_pad_configs(sd);
> + if (err)
> + goto error_unregister;
> +
I don't thin
> #if defined(CONFIG_MEDIA_CONTROLLER)
> /* Register the entity. */
> if (v4l2_dev->mdev) {
> err = media_device_register_entity(v4l2_dev->mdev, entity);
> if (err < 0)
> - goto error_unregister;
> + goto error_free_pad_configs;
> }
> #endif
>
> @@ -198,6 +202,9 @@ int v4l2_device_register_subdev(struct v4l2_device
> *v4l2_dev,
>
> return 0;
>
> +error_free_pad_configs:
> + kfree(sd->pad_configs);
> + sd->pad_configs = NULL;
> error_unregister:
> if (sd->internal_ops && sd->internal_ops->unregistered)
> sd->internal_ops->unregistered(sd);
> @@ -282,6 +289,8 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev
> *sd)
>
> if (sd->internal_ops && sd->internal_ops->unregistered)
> sd->internal_ops->unregistered(sd);
> + kfree(sd->pad_configs);
> + sd->pad_configs = NULL;
> sd->v4l2_dev = NULL;
>
> #if defined(CONFIG_MEDIA_CONTROLLER)
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c
> b/drivers/media/v4l2-core/v4l2-subdev.c index 3c8b198..a7b874e 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -560,6 +560,41 @@ int v4l2_subdev_link_validate(struct media_link *link)
> EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
> #endif /* CONFIG_MEDIA_CONTROLLER */
>
> +int v4l2_subdev_create_pad_configs(struct v4l2_subdev *sd)
> +{
> +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
> + struct v4l2_subdev_format fmt = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + unsigned pads = sd->entity.num_pads;
> + unsigned pad;
> + int err;
> +
> + if (pads == 0)
> + return 0;
> + sd->pad_configs = kcalloc(pads, sizeof(*sd->pad_configs), GFP_KERNEL);
> + if (sd->pad_configs == NULL)
> + return -ENOMEM;
> + for (pad = 0; pad < pads; pad++) {
> + fmt.pad = pad;
> + err = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
> +
> + if (err && err != -ENOIOCTLCMD) {
> + kfree(sd->pad_configs);
> + sd->pad_configs = NULL;
> + return err;
> + }
> + sd->pad_configs[pad].try_fmt = fmt.format;
> + sd->pad_configs[pad].try_crop.width = fmt.format.width;
> + sd->pad_configs[pad].try_crop.height = fmt.format.height;
> + sd->pad_configs[pad].try_compose.width = fmt.format.width;
> + sd->pad_configs[pad].try_compose.height = fmt.format.height;
> + }
> +#endif
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_subdev_create_pad_configs);
> +
> void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops
> *ops) {
> INIT_LIST_HEAD(&sd->list);
> @@ -571,6 +606,7 @@ void v4l2_subdev_init(struct v4l2_subdev *sd, const
> struct v4l2_subdev_ops *ops) sd->grp_id = 0;
> sd->dev_priv = NULL;
> sd->host_priv = NULL;
> + sd->pad_configs = NULL;
> #if defined(CONFIG_MEDIA_CONTROLLER)
> sd->entity.name = sd->name;
> sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 175dc4f..e9e8b15 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -611,6 +611,8 @@ struct v4l2_subdev {
> char name[V4L2_SUBDEV_NAME_SIZE];
> /* can be used to group similar subdevs, value is driver-specific */
> u32 grp_id;
> + /* Used by bridge drivers to allocate a pad config array */
> + struct v4l2_subdev_pad_config *pad_configs;
> /* pointer to private data */
> void *dev_priv;
> void *host_priv;
> @@ -689,6 +691,8 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev
> *sd, struct v4l2_subdev_format *sink_fmt);
> int v4l2_subdev_link_validate(struct media_link *link);
> #endif /* CONFIG_MEDIA_CONTROLLER */
> +
> +int v4l2_subdev_create_pad_configs(struct v4l2_subdev *sd);
> void v4l2_subdev_init(struct v4l2_subdev *sd,
> const struct v4l2_subdev_ops *ops);
--
Regards,
Laurent Pinchart
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