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

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Date:   Mon, 29 Mar 2021 17:35:41 +0300
From:   Pekka Paalanen <ppaalanen@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Simon Ser <contact@...rsion.fr>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        od@...c.me, dri-devel@...ts.freedesktop.org, stable@...r.kernel.org
Subject: Re: [PATCH] drm: DON'T require each CRTC to have a unique primary
 plane

On Mon, 29 Mar 2021 12:41:00 +0100
Paul Cercueil <paul@...pouillou.net> wrote:

> Hi,
> 
> Le lun. 29 mars 2021 à 11:15, Pekka Paalanen <ppaalanen@...il.com> a 
> écrit :
> > On Sat, 27 Mar 2021 11:26:26 +0000
> > Paul Cercueil <paul@...pouillou.net> wrote:
> >   
> >>  It has two mutually exclusive background planes (same Z level) + one
> >>  overlay plane.  
> > 
> > What's the difference between the two background planes?
> > 
> > How will generic userspace know to pick the "right" one?  
> 
> First primary plane cannot scale, supports RGB and C8. Second primary 
> plane goes through the IPU, and as such can scale and convert pixel 
> formats; it supports RGB, non-planar YUV, and multi-planar YUV.
> 
> Right now the userspace apps we have will simply pick the first one 
> that fits the bill.

What would be the downside of exposing just one "virtual" primary
plane, and then have the driver pick one of the two hardware planes as
appropriate per modeset?

Thanks,
pq

> >>  Le sam. 27 mars 2021 à 11:24, Simon Ser <contact@...rsion.fr> a 
> >> écrit
> >>  :  
> >>  > On Saturday, March 27th, 2021 at 12:22 PM, Paul Cercueil
> >>  > <paul@...pouillou.net> 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.  
> >>  >
> >>  > Why does this driver expose two primary planes, if it only has a
> >>  > single
> >>  > CRTC?  
> >> 
> >> 
> >>  _______________________________________________
> >>  dri-devel mailing list
> >>  dri-devel@...ts.freedesktop.org
> >>  https://lists.freedesktop.org/mailman/listinfo/dri-devel  
> >   
> 
> 

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