drm/i915: Use ring->flush() instead of MI_FLUSH

Use the ring abstraction to hide the details of having choose the
appropriate flushing method.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_drv.h

@@ -1001,6 +1001,10 @@ void i915_gem_retire_requests(struct drm_device *dev);
 void i915_gem_reset_flushing_list(struct drm_device *dev);
 void i915_gem_reset_inactive_gpu_domains(struct drm_device *dev);
 void i915_gem_clflush_object(struct drm_gem_object *obj);
+void i915_gem_flush_ring(struct drm_device *dev,
+			 struct intel_ring_buffer *ring,
+			 uint32_t invalidate_domains,
+			 uint32_t flush_domains);
 int i915_gem_object_set_domain(struct drm_gem_object *obj,
 			       uint32_t read_domains,
 			       uint32_t write_domain);

drivers/gpu/drm/i915/i915_gem.c

@@ -1908,7 +1908,7 @@ i915_wait_request(struct drm_device *dev, uint32_t seqno,
 	return i915_do_wait_request(dev, seqno, 1, ring);
 }
 
-static void
+void
 i915_gem_flush_ring(struct drm_device *dev,
 		    struct intel_ring_buffer *ring,
 		    uint32_t invalidate_domains,

drivers/gpu/drm/i915/intel_display.c

@@ -5056,24 +5056,23 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	atomic_inc(&obj_priv->pending_flip);
 	work->pending_flip_obj = obj;
 
-	if (was_dirty || IS_GEN3(dev) || IS_GEN2(dev)) {
-		BEGIN_LP_RING(2);
-		if (IS_GEN3(dev) || IS_GEN2(dev)) {
-			u32 flip_mask;
+	/* Schedule the pipelined flush */
+	if (was_dirty)
+		i915_gem_flush_ring(dev, obj_priv->ring, 0, was_dirty);
 
-			/* Can't queue multiple flips, so wait for the previous
-			 * one to finish before executing the next.
-			 */
+	if (IS_GEN3(dev) || IS_GEN2(dev)) {
+		u32 flip_mask;
 
-			if (intel_crtc->plane)
-				flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
-			else
-				flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
-
-			OUT_RING(MI_WAIT_FOR_EVENT | flip_mask);
-		} else
-			OUT_RING(MI_NOOP);
-		OUT_RING(MI_FLUSH);
+		/* Can't queue multiple flips, so wait for the previous
+		 * one to finish before executing the next.
+		 */
+		BEGIN_LP_RING(2);
+		if (intel_crtc->plane)
+			flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
+		else
+			flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
+		OUT_RING(MI_WAIT_FOR_EVENT | flip_mask);
+		OUT_RING(MI_NOOP);
 		ADVANCE_LP_RING();
 	}