Hi Laurent,
Looks good, but I have one question. See below.
On 05/23/2015 08:24 PM, Laurent Pinchart wrote:
> Add a new subdev operation to initialize a subdev pad config array, and
> a helper function to allocate and initialize the array. This can be used
> by bridge drivers to implement try format based on subdev pad
> operations.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxx>
> Acked-by: Vaibhav Hiremath <vaibhav.hiremath@xxxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-subdev.c | 19 ++++++++++++++++++-
> include/media/v4l2-subdev.h | 3 +++
> 2 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 63596063b213..d594fe566be2 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -35,7 +35,7 @@
> static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
> {
> #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
> - fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
> + fh->pad = v4l2_subdev_alloc_pad_config(sd);
> if (fh->pad == NULL)
> return -ENOMEM;
> #endif
> @@ -569,6 +569,23 @@ int v4l2_subdev_link_validate(struct media_link *link)
> sink, link, &source_fmt, &sink_fmt);
> }
> EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
> +
> +struct v4l2_subdev_pad_config *v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
> +{
> + struct v4l2_subdev_pad_config *cfg;
> +
> + if (!sd->entity.num_pads)
> + return NULL;
> +
> + cfg = kcalloc(sd->entity.num_pads, sizeof(*cfg), GFP_KERNEL);
> + if (!cfg)
> + return NULL;
> +
> + v4l2_subdev_call(sd, pad, init_cfg, cfg);
> +
> + return cfg;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
> #endif /* CONFIG_MEDIA_CONTROLLER */
>
> void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 8f5da73dacff..7860d67574f5 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -483,6 +483,8 @@ struct v4l2_subdev_pad_config {
> * may be adjusted by the subdev driver to device capabilities.
> */
> struct v4l2_subdev_pad_ops {
> + void (*init_cfg)(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg);
> int (*enum_mbus_code)(struct v4l2_subdev *sd,
> struct v4l2_subdev_pad_config *cfg,
> struct v4l2_subdev_mbus_code_enum *code);
> @@ -675,6 +677,7 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
> struct v4l2_subdev_format *source_fmt,
> struct v4l2_subdev_format *sink_fmt);
> int v4l2_subdev_link_validate(struct media_link *link);
> +struct v4l2_subdev_pad_config *v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd);
Would it make sense to add a simple static inline v4l2_subdev_free_pad_config here?
All it does is a kfree, but still it makes it symmetrical and if we ever need to
do more than a kfree, then we are able to do so.
At the very least this header needs a comment if we don't add a free_pad_config that
the caller needs to kfree the pointer.
Regards,
Hans
> #endif /* CONFIG_MEDIA_CONTROLLER */
> void v4l2_subdev_init(struct v4l2_subdev *sd,
> const struct v4l2_subdev_ops *ops);
>
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