On Mon, 29 Mar 2021 12:41:00 +0100 Paul Cercueil paul@crapouillou.net wrote:
Hi,
Le lun. 29 mars 2021 à 11:15, Pekka Paalanen ppaalanen@gmail.com a écrit :
On Sat, 27 Mar 2021 11:26:26 +0000 Paul Cercueil paul@crapouillou.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@emersion.fr a écrit :
On Saturday, March 27th, 2021 at 12:22 PM, Paul Cercueil paul@crapouillou.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?
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