Hi Lucas, On Fri, 2017-11-24 at 18:11 +0100, Lucas Stach wrote: > Am Freitag, den 24.11.2017, 16:49 +0000 schrieb Alexey Brodkin: > [...] > > > > > > > > Yes, a "core" in Vivante speak is a GPU with one DMA frontend. A > > > single > > > frontend can feed both 3D and 2D acceleration engines behind it. On > > > i.MX6 the 2D and 3D engine are on separate cores, but Marvell Dove > > > has > > > a combined 2D/3D core. > > > > Hm, that sounds encouraging. The next question would be if Marvel > > Dove is > > supported in Etnaviv DDX? I guess it's called Armada so the answer if > > yes, right? > > Yes, the Dove was the original platform for the Armada X.Org driver. > Combined 2D/3D cores are supported just fine by etnaviv. Sweet! Maybe another question then. To get kmscube working on our board which uses essentially different bit-streamer device "udl" as opposed to "imx-drm" I had just to say: ---------------------->8---------------------- export MESA_LOADER_DRIVER_OVERRIDE=imx-drm ---------------------->8---------------------- and then all the magic has happened. Will it be ?a) required ?b) enough for Vivante X.org driver? > > > > If we happen to not have 2D core if that's a no go for us for > > > > anything? > > > > > > I don't know if the DDX works properly without 2D acceleration. > > > Weston > > > on the other hand only relies on the 3D accel core for doing > > > compositing, so even if you don't have a 2D engine you will be able > > > to > > > launch a modern Linux graphics stack. > > > > That's really cool! I'm much more interested in Weston ATM, which is > > actually another separate question :) > > I tried to find some details on how to run Weston on Wandboard > > but seems like I was looking at wrong Google again... do you > > know any good manuals for doing that? > > There really is no magic to it. Or better there is, but it's all hidden > in the Mesa implementation. > > You need at least Mesa 17.2 and Weston 3.0 for etnaviv to work > properly. Other than that just set XDG_RUNTIME_DIR to something > sensible and launch Weston with "weston --tty=63", done. Cool, will try that! > > > The etnaviv DDX could also emulate 2D accel over the 3D core by > > > using > > > the X.Org glamor module, but no one has bothered to implement this > > > yet. > > > > Ok we'll see if above case (combined cores) is applicable to us and > > then > > we'll see what to do. > > > > > > > > > > > > > In the meantime I'll try to figure out if we have 2D core or not. > > > > > > You can find out what your GPU provides by looking at the feature > > > bits. > > > chipFeatures_PIPE_2D, chipFeatures_PIPE_3D and chipFeatures_PIPE_VG > > > is > > > what you are looking out for. > > > > Does that info helps to decipher these bits? > > Unfortunately we forgot to expose the major feature bits register in > debugfs. It's gpu->identity.features in the kernel driver, the > interesting bits in there are chipFeatures_PIPE_3D and > chipFeatures_PIPE_2D. Noted! Are you going to add that yourself sometime soon or shall I do it? -Alexey
