Quoting Ville Syrjala (2018-02-21 16:02:35)
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
> 
> Currently the FBC code doesn't handle the 90/270 degree rotated case
> correctly. We would need the GTT tracking to monitor the fence on the
> normal GTT view (the rotated view doesn't even have a fence). Not quite
> sure how we should program the fence Y offset etc. in that case. For now
> we'll end up disabling FBC with 90/270 degree rotation. Add a FIXME
> to remind people about this fact.

Oh my. plane_state would have to track both normal_vma and rotated_vma,
at least that is less complicated than having rotated_vma automagically
pin the normal_vma.

> v2: Reword the text (Chris)
>     Move the FIXME to the fbc code
> 
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
-Chris
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