Re: [PATCH] drm: DON'T require each CRTC to have a unique primary plane

[Paul Cercueil]

Hi Maxime,

Le lun. 29 mars 2021 à 16:07, Maxime Ripard <maxime@xxxxxxxxxx> a 
écrit :
> On Sat, Mar 27, 2021 at 11:22:14AM +0000, Paul Cercueil wrote:
> >  The ingenic-drm driver has two mutually exclusive primary planes
> >  already; so the fact that a CRTC must have one and only one primary
> >  plane is an invalid assumption.
>
> I mean, no? It's been documented for a while that a CRTC should only
> have a single primary, so I'd say that the invalid assumption was that
> it was possible to have multiple primary planes for a CRTC.

Documented where?

I did read the doc of "enum drm_plane_type" in <drm/drm_plane.h>, and 
the DRM_PLANE_TYPE_PRIMARY describes my two planes, so I went with that.

-Paul

> Since it looks like you have two mutually exclusive planes, just 
> expose
> one and be done with it?
>
> Maxime