[Intel-gfx] [patch] Fix XV scan line calculation when rotated

[Łukasz Kuryło]

> 
> What I can say is that for a single screen this works and I have 
> instrumented the code to
> see the before and after values to satisfy my self that this works.
> 
> I assume that before transformation the coordinates are clipped to the 
> framebuffer and therefore
> after transformation it is clipped to the crtc.

That's true for case when region spans only one crtc.

> 
> I don't have a dual head config that I can test this out on. Do you?
> 

Yes I work with dual head configuration all the time.

> It would be easy to add a couple ErrorF to resolve this one way or the 
> other.
> Can you do this so that we can remove the uncertainy?

I will try to work on this tomorrow.

> 
> Barry
> 
> 
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