drm/i915/skl: Take 90/270 rotation into account in watermark calculations

v2: Pass in rotation info to sprite plane updates as well.

v3: Use helper to determine 90/270 rotation. (Michel Thierry)

v4: Rebased for fb modifiers and atomic changes.

For: VIZ-4546
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com> (v3)
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index db0e7bf..811a1db 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -501,6 +501,7 @@
 	bool enabled;
 	bool scaled;
 	u64 tiling;
+	unsigned int rotation;
 };
 
 struct intel_plane {
@@ -994,6 +995,9 @@
 	return rotation & (BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_270));
 }
 
+bool intel_wm_need_update(struct drm_plane *plane,
+			  struct drm_plane_state *state);
+
 /* shared dpll functions */
 struct intel_shared_dpll *intel_crtc_to_shared_dpll(struct intel_crtc *crtc);
 void assert_shared_dpll(struct drm_i915_private *dev_priv,