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 maxime@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...
Maxime