drm/i915: Signal drm events for atomic

This is part of what atomic must implement. And it's also required
to be able to use the helper nonblocking support.

v2: Always send out the drm event, remove the planes_changed check.
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1465827229-1704-1-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/i915/intel_display.c

@@ -13799,13 +13799,21 @@ static int intel_atomic_commit(struct drm_device *dev,
 		bool modeset = needs_modeset(crtc->state);
 		struct intel_crtc_state *pipe_config =
 			to_intel_crtc_state(crtc->state);
-		bool update_pipe = !modeset && pipe_config->update_pipe;
 
 		if (modeset && crtc->state->active) {
 			update_scanline_offset(to_intel_crtc(crtc));
 			dev_priv->display.crtc_enable(crtc);
 		}
 
+		/* Complete events for now disable pipes here. */
+		if (modeset && !crtc->state->active && crtc->state->event) {
+			spin_lock_irq(&dev->event_lock);
+			drm_crtc_send_vblank_event(crtc, crtc->state->event);
+			spin_unlock_irq(&dev->event_lock);
+
+			crtc->state->event = NULL;
+		}
+
 		if (!modeset)
 			intel_pre_plane_update(to_intel_crtc_state(old_crtc_state));
 
@@ -13813,8 +13821,7 @@ static int intel_atomic_commit(struct drm_device *dev,
 		    drm_atomic_get_existing_plane_state(state, crtc->primary))
 			intel_fbc_enable(intel_crtc);
 
-		if (crtc->state->active &&
-		    (crtc->state->planes_changed || update_pipe))
+		if (crtc->state->active)
 			drm_atomic_helper_commit_planes_on_crtc(old_crtc_state);
 
 		if (pipe_config->base.active && needs_vblank_wait(pipe_config))

drivers/gpu/drm/i915/intel_sprite.c

@@ -166,6 +166,20 @@ void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work
 
 	trace_i915_pipe_update_end(crtc, end_vbl_count, scanline_end);
 
+	/* We're still in the vblank-evade critical section, this can't race.
+	 * Would be slightly nice to just grab the vblank count and arm the
+	 * event outside of the critical section - the spinlock might spin for a
+	 * while ... */
+	if (crtc->base.state->event) {
+		WARN_ON(drm_crtc_vblank_get(&crtc->base) != 0);
+
+		spin_lock(&crtc->base.dev->event_lock);
+		drm_crtc_arm_vblank_event(&crtc->base, crtc->base.state->event);
+		spin_unlock(&crtc->base.dev->event_lock);
+
+		crtc->base.state->event = NULL;
+	}
+
 	local_irq_enable();
 
 	if (crtc->debug.start_vbl_count &&