drm/i915: Helper function to determine GGTT view from plane state

For now only default implementation defaulting to normal view.

v2: Some code review cleanups. (Joonas Lahtinen)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> (v2)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -2288,6 +2288,15 @@ intel_fb_align_height(struct drm_device *dev, unsigned int height,
 					       fb_format_modifier));
 }
 
+static int
+intel_fill_fb_ggtt_view(struct i915_ggtt_view *view, struct drm_framebuffer *fb,
+			const struct drm_plane_state *plane_state)
+{
+	*view = i915_ggtt_view_normal;
+
+	return 0;
+}
+
 int
 intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 			   struct drm_framebuffer *fb,
@@ -2297,6 +2306,7 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 	struct drm_device *dev = fb->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	struct i915_ggtt_view view;
 	u32 alignment;
 	int ret;
 
@@ -2333,6 +2343,10 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 		return -EINVAL;
 	}
 
+	ret = intel_fill_fb_ggtt_view(&view, fb, plane_state);
+	if (ret)
+		return ret;
+
 	/* Note that the w/a also requires 64 PTE of padding following the
 	 * bo. We currently fill all unused PTE with the shadow page and so
 	 * we should always have valid PTE following the scanout preventing
@@ -2352,7 +2366,7 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 
 	dev_priv->mm.interruptible = false;
 	ret = i915_gem_object_pin_to_display_plane(obj, alignment, pipelined,
-						   &i915_ggtt_view_normal);
+						   &view);
 	if (ret)
 		goto err_interruptible;
 
@@ -2372,7 +2386,7 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 	return 0;
 
 err_unpin:
-	i915_gem_object_unpin_from_display_plane(obj, &i915_ggtt_view_normal);
+	i915_gem_object_unpin_from_display_plane(obj, &view);
 err_interruptible:
 	dev_priv->mm.interruptible = true;
 	intel_runtime_pm_put(dev_priv);
@@ -2383,11 +2397,16 @@ static void intel_unpin_fb_obj(struct drm_framebuffer *fb,
 			       const struct drm_plane_state *plane_state)
 {
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	struct i915_ggtt_view view;
+	int ret;
 
 	WARN_ON(!mutex_is_locked(&obj->base.dev->struct_mutex));
 
+	ret = intel_fill_fb_ggtt_view(&view, fb, plane_state);
+	WARN_ONCE(ret, "Couldn't get view from plane state!");
+
 	i915_gem_object_unpin_fence(obj);
-	i915_gem_object_unpin_from_display_plane(obj, &i915_ggtt_view_normal);
+	i915_gem_object_unpin_from_display_plane(obj, &view);
 }
 
 /* Computes the linear offset to the base tile and adjusts x, y. bytes per pixel