Re: [PATCH v7 08/27] media: entity: Add has_route entity operation

[Jacopo Mondi <jacopo@jmondi.org>]

Hi Sakari,

On Sun, Jul 11, 2021 at 06:26:26PM +0300, Sakari Ailus wrote:
> On Thu, Jul 08, 2021 at 02:43:10PM +0200, Jacopo Mondi wrote:
> > Hi Tomi,
> >    a small note
> >
> > On Mon, May 24, 2021 at 01:43:49PM +0300, Tomi Valkeinen wrote:
> > > From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > >
> > > The optional operation can be used by entities to report whether two
> > > pads are internally connected.
> > >
> > > While at there, fix a Sphinx compiler warning in a comment block a few
> > > lines above.
> > >
> > > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > > Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> > > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> > > ---
> > >  include/media/media-entity.h | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > >
> > > diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> > > index 516d73a2941e..ad4020b2df65 100644
> > > --- a/include/media/media-entity.h
> > > +++ b/include/media/media-entity.h
> > > @@ -187,6 +187,7 @@ enum media_pad_signal_type {
> > >   * @flags:	Pad flags, as defined in
> > >   *		:ref:`include/uapi/linux/media.h <media_header>`
> > >   *		(seek for ``MEDIA_PAD_FL_*``)
> > > + *
> > >   * .. note::
> > >   *
> > >   *    @stream_count reference count must never be negative, but is a signed
> > > @@ -214,6 +215,10 @@ struct media_pad {
> > >   * @link_validate:	Return whether a link is valid from the entity point of
> > >   *			view. The media_pipeline_start() function
> > >   *			validates all links by calling this operation. Optional.
> > > + * @has_route:		Return whether a route exists inside the entity between
> > > + *			two given pads. Pads are passed to the operation ordered
> > > + *			by index. Optional: If the operation isn't implemented
> >
> > According to the next patch, this doesn't seem to be 'Optional:' :)
>
> How? Few drivers will implement this in the end, and that's been taken into
> account in code AFAIU.

What I meant is that it's not optional that all pads are considered
connected if the op is not implemented. Or maybe this should have read
as "Implementing the operation is optional" ?

>
> --
> Sakari Ailus