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

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Date:   Sat, 27 Mar 2021 11:26:26 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Simon Ser <contact@...rsion.fr>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, od@...c.me,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] drm: DON'T require each CRTC to have a unique primary
 plane

It has two mutually exclusive background planes (same Z level) + one 
overlay plane.

-Paul


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?