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drm_mode_getplane
2019 Apr 03
0
[PATCH] drm/cirrus: rewrite and modernize driver.
..., you're adding a format-conversion blit in
> the middle for no reason. If I could ask the kernel for the entire list
> of supported formats, I could only set up the shadow if it was
> necessary.
There's already a list of supported formats for each DRM plane, which
you can get via drmModeGetPlane (being careful to enable universal
planes so you can discover the primary plane). The same information is
present in the 'IN_FORMATS' property, which is more difficult to parse
but also tells you about modifiers.
modesetting already pulls all this out (at least in the atomic path)
so we ca...