Le jeu. 11 mars 2021 à 12:30, Christoph Hellwig <hch@xxxxxxxxxxxxx> a
écrit :
On Sun, Mar 07, 2021 at 08:28:35PM +0000, Paul Cercueil wrote:
With the module parameter ingenic-drm.cached_gem_buffers, it is
possible
to specify that we want GEM buffers backed by non-coherent memory.
Shouldn't there be a way to discover this through a DT property?
Good question. My original way of thinking was that as this feature
speeds up only software rendering, this is really
application-dependent: a modern desktop where everything is rendered
via the GPU wouldn't benefit much from it. With that in mind, it is
fine as a module option.
On the other hand... the "software rendering is faster with
non-coherent buffers" really is a SoC property, since it is only true
for some generations of Ingenic SoCs and not others. So it would make
sense to have a DT property for it.
-Paul
