[Intel-gfx] scaling on ivy bridge

[Paulo Zanoni]

2012/10/9 ron minnich <rminnich at gmail.com>:
> I have a display that is, e.g., 2560x1600 on an ivybridge. I'd like to
> set it up so that the software sees a display with half that
> resolution, i.e. the software that draws into the frame buffer (this
> is a bios) can draw into what it sees as a 1280x800 display.
>
> I've tried a few things but I'm realizing I don't understand the
> ivybridge panel fitter at all. This display is on PIPEA. It appears on
> sandybridge one can write
> PFA_VSCALE, PFA_HSCALE, PFA_WIN_SZ, and PFA_WIN_POS and _PFA_CTL_1 and
> it all works.
>
> On Ivybridge it seems far more complex. Or am I missing something? I
> don't see any fitting code in the drm driver itself, so I'm not quite
> sure how it's done.

Take a look at this tool:
http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/tree/tools/intel_panel_fitter.c

It's not guaranteed to work, but it may serve as a starting point for
your implementation.

>
> Thanks in advance, as always.
>
> ron
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-- 
Paulo Zanoni