Revert "drm/radeon: rework page flip handling v3"

This reverts commit 1aab5514.

Apply the fixed up version instead.

drivers/gpu/drm/radeon/radeon.h

@@ -676,16 +676,14 @@ void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell);
  * IRQS.
  */
 
-struct radeon_flip_work {
-	struct work_struct		flip_work;
-	struct work_struct		unpin_work;
+struct radeon_unpin_work {
+	struct work_struct work;
 	struct radeon_device *rdev;
 	int crtc_id;
-	struct drm_framebuffer		*fb;
+	struct radeon_fence *fence;
 	struct drm_pending_vblank_event *event;
 	struct radeon_bo *old_rbo;
-	struct radeon_bo		*new_rbo;
-	struct radeon_fence		*fence;
+	u64 new_crtc_base;
 };
 
 struct r500_irq_stat_regs {

drivers/gpu/drm/radeon/radeon_mode.h

@@ -325,8 +325,8 @@ struct radeon_crtc {
 	struct drm_display_mode native_mode;
 	int pll_id;
 	/* page flipping */
-	struct workqueue_struct *flip_queue;
-	struct radeon_flip_work *flip_work;
+	struct radeon_unpin_work *unpin_work;
+	int deferred_flip_completion;
 	/* pll sharing */
 	struct radeon_atom_ss ss;
 	bool ss_enabled;