[RFC 3/4] drm: fixed: Add dfixed_frac() macro

[Thierry Reding]

* Stephen Warren wrote:
> On 04/11/2012 06:10 AM, Thierry Reding wrote:
> > This commit is taken from the Chromium tree and was originally written
> > by Robert Morell.
> 
> Maybe just cherry-pick it from there? That way, the git authorship will
> show up as Robert.

I can do that. Though I'll have to remove the Chromium-specific tags.

Thierry
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