Re: [PATCH v2 5/5] drm/ingenic: Add option to alloc cached GEM buffers

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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





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