[PATCH] media: rkisp1: Don't create data links for non-sensor subdevs

[Jacopo Mondi]

Hi Dan

On Mon, Jun 06, 2022 at 11:51:49PM +0100, Daniel Scally wrote:
> With the introduction of ancillary links, not all subdevs linked to
> the ISP's v4l2_dev necessarily represent sensors / bridges. Check the
> function for the subdevs and skip any that represent lens or flash
> controllers before creating data links.
>
> Signed-off-by: Daniel Scally <djrscally at gmail.com>
> ---
>
> This should fix the issues that have been noticed, but perhaps a new flag like
> MEDIA_ENT_FL_HAS_SOURCE or something would be a better way to denote subdevs
> that need data links?
>

I agree this a bit fragile...

I noticed ancillary links are only created for subdev notifiers,
which have a populated 'sd' and consequentially an entity. Could an
helper that walks the links of the notifier's subdev links and checks
if the subdev at hand is already linked, help ? Maybe with an optional
set of link flags to match on ?


>  drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> index 3f5cfa7eb937..e90f0216cb06 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> @@ -134,6 +134,10 @@ static int rkisp1_create_links(struct rkisp1_device *rkisp1)
>  		    sd == &rkisp1->resizer_devs[RKISP1_SELFPATH].sd)
>  			continue;
>
> +		if (sd->entity.function == MEDIA_ENT_F_LENS ||
> +		    sd->entity.function == MEDIA_ENT_F_FLASH)
> +			continue;
> +
>  		ret = media_entity_get_fwnode_pad(&sd->entity, sd->fwnode,
>  						  MEDIA_PAD_FL_SOURCE);
>  		if (ret < 0) {
> --
> 2.25.1
>