[PATCH v3 12/21] drm/bridge: Add an ->atomic_check() hook

[Laurent Pinchart]

Hi Boris,

On Tue, Dec 03, 2019 at 11:11:51AM +0100, Boris Brezillon wrote:
> On Mon, 2 Dec 2019 19:03:36 +0200 Laurent Pinchart wrote:
> 
> > > +	/**
> > > +	 * @atomic_check:
> > > +	 *
> > > +	 * This method is responsible for checking bridge state correctness.
> > > +	 * It can also check the state of the surrounding components in chain
> > > +	 * to make sure the whole pipeline can work properly.  
> > 
> > As explained in the review of the RFC, I think it's a mistake not to
> > define the semantics of this operation precisely, and in particular not
> > to define explictly what parameters bridge drivers are allowed to modify
> > here. I however don't want to make this a prerequisite for your series,
> > so
> > 
> > Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > 
> > but I'm sure we'll regret this later when different bridges will have
> > slightly incompatible implementations.
> 
> Nothing prevents us from working on this clarification after the patch
> series has been merged. I just said I couldn't come up with a good
> set of rules on my own, as I don't really know what bridge->mode_fixup()
> allows us to modify in the first place.

We can of course work on it later, but we both know it won't happen for
some time, until different bridges will behave differently and we'll
have to sort a really big mess :-)

-- 
Regards,

Laurent Pinchart