[Intel-gfx] [PATCH 2/2] drm/i915: calculate pfit changes in set_config v3

[Jesse Barnes]

On Tue, 11 Nov 2014 12:30:47 -0800
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> This should allow us to avoid mode sets for some panel fitter config
> changes.
> 
> v2:
>   - fixup pfit comment (Ander)
> v3:
>   - fixup pfit disable shortcut, only apply to gen4 for now (Jesse)
> 

Daniel pointed out offline that in the !fastboot case, this will fail
to do the pipe size update if we ever try to skip the mode set when
changing the pfit state.

To address that we'll need to handle the pfit changes more generally
anyway, which gets tricky when we're trying to discard the BIOS state.

Ander, if you want to tackle this as part of your multi-pipe stuff,
feel free, otherwise I'll get to it after the holidays.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center