[Mesa-dev] [Nouveau] [RFC] tegra: Initial support

Alexandre Courbot acourbot at nvidia.com
Thu Nov 27 21:14:24 PST 2014

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?

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