drm/i915: Calculate the sprite WM based on the source width instead of the destination width
Using the destination width in the sprite WM calculations isn't correct. We should be using the source width. Note: This doesn't affect hsw since it does not support sprite scaling. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> [danvet: Add review note from Paulo to the commit message.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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