On Mon, Mar 29, 2021 at 04:15:28PM +0100, Paul Cercueil wrote: > Hi Maxime, > > Le lun. 29 mars 2021 à 16:07, Maxime Ripard <max...@cerno.tech> 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.
At least since 4.9, this was in the documentation generated for DRM: https://elixir.bootlin.com/linux/v4.9.263/source/drivers/gpu/drm/drm_plane.c#L43 Maxime
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