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 15:42:08 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Maxime Ripard <maxime@...no.tech>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        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

On Monday, March 29th, 2021 at 5:39 PM, Paul Cercueil <paul@...pouillou.net> wrote:

> Ok, I read that as "all drivers should provide AT LEAST one primary
> plane per CRTC", and not as "all drivers should provide ONE AND ONLY
> ONE primary plane per CRTC". My bad.

Yeah, it's a little complicated to document, because it's possible for
a primary plane to be compatible with multiple CRTCs… We tried to
improve this [1] recently.

[1]: https://dri.freedesktop.org/docs/drm/gpu/drm-kms.html#plane-abstraction