drm/i915: Spruce up assert_sprites_disabled()

Make assert_sprites_disabled() operational on all platforms where
we currently have sprite support enabled.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -1135,13 +1135,11 @@ static void assert_planes_disabled(struct drm_i915_private *dev_priv,
 static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
 				    enum pipe pipe)
 {
+	struct drm_device *dev = dev_priv->dev;
 	int reg, i;
 	u32 val;
 
-	if (!IS_VALLEYVIEW(dev_priv->dev))
-		return;
-
-	/* Need to check both planes against the pipe */
+	if (IS_VALLEYVIEW(dev)) {
 		for (i = 0; i < dev_priv->num_plane; i++) {
 			reg = SPCNTR(pipe, i);
 			val = I915_READ(reg);
@@ -1149,6 +1147,19 @@ static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
 			     "sprite %c assertion failure, should be off on pipe %c but is still active\n",
 			     sprite_name(pipe, i), pipe_name(pipe));
 		}
+	} else if (INTEL_INFO(dev)->gen >= 7) {
+		reg = SPRCTL(pipe);
+		val = I915_READ(reg);
+		WARN((val & SPRITE_ENABLE),
+		     "sprite %c assertion failure, should be off on pipe %c but is still active\n",
+		     plane_name(pipe), pipe_name(pipe));
+	} else if (INTEL_INFO(dev)->gen >= 5) {
+		reg = DVSCNTR(pipe);
+		val = I915_READ(reg);
+		WARN((val & DVS_ENABLE),
+		     "sprite %c assertion failure, should be off on pipe %c but is still active\n",
+		     plane_name(pipe), pipe_name(pipe));
+	}
 }
 
 static void assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)