On Fri, Nov 28, 2014 at 05:52:26PM +0900, Alexandre Courbot wrote: > On Fri, Nov 28, 2014 at 5:48 PM, Thierry Reding > <thierry.red...@gmail.com> wrote: > > On Fri, Nov 28, 2014 at 02:14:24PM +0900, Alexandre Courbot wrote: > >> On 11/28/2014 01:39 AM, Thierry Reding wrote: > >> >Tegra K1 and later use a GPU that can be driven by the Nouveau driver. > >> >But the GPU is a pure render node and has no display engine, hence the > >> >scanout needs to happen on the Tegra display hardware. The GPU and the > >> >display engine each have a separate DRM device node exposed by the > >> >kernel. > >> > > >> >To make the setup appear as a single device, this driver instantiates > >> >a Nouveau screen with each instance of a Tegra screen and forwards GPU > >> >requests to the Nouveau screen. For purposes of scanout it will import > >> >buffers created on the GPU into the display driver. Handles that > >> >userspace requests are those of the display driver so that they can be > >> >used to create framebuffers. > >> > > >> >This has been tested with some GBM test programs, as well as kmscube and > >> >weston. All of those run without modifications, but I'm sure there is a > >> >lot that can be improved. > >> > >> Tested with kmscube and Weston and I can confirm this works. However, EGL > >> clients inside Weston have their window filled with garbage (they seem to > >> run fine otherwise). Do you also experience this? > > > > To be honest, that wasn't part of my set of test cases. I had assumed > > that since Weston could composite buffers into a final scan out buffer > > everything else would just work as well. Do you have any particular > > demos that aren't working? > > Anything using EGL under Wayland - the simplest case would be > weston-simple-egl. glmark2 also displays a broken window, but then > crashes shortly after. With weston-simpe-egl I get the framerate > feedback and can see the GPU performance counters moving as expected, > indicating that the app is rendering correctly but that Weston gets > the wrong buffer to display.
Okay, I'll need to look into this more closely. Thanks for reporting. Thierry
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