[PATCH] Automatically determine appropriate pipe from plane info

[Roland Scheidegger]

On 9/12/07, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> Rather than keeping a copy of the plane->pipe mapping code in the SAREA,
> just figure out what the real mapping is from the DSP(A|B)CNTR register
> at runtime.  This should be fairly safe since the DRM doesn't actually
> modify the pipe->plane mappings, though there is the possibility for
> app confusion if the DDX changes the mappings between a vblank swap
> submission and completion.
Wouldn't it be simpler (if you don't want that information to be in
the sarea) to just set the mapping with a setparam ioctl rather than
trying to be smart and needing to figure it out every vblank?

Roland