drm/bochs: atomic: add atomic_flush+atomic_enable callbacks.

Conversion to atomic modesetting, step one.
Add atomic crtc helper callbacks.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20190111053752.4004-4-kraxel@redhat.com

drivers/gpu/drm/bochs/bochs_kms.c

@@ -115,6 +115,29 @@ static int bochs_crtc_page_flip(struct drm_crtc *crtc,
 	return 0;
 }
 
+static void bochs_crtc_atomic_enable(struct drm_crtc *crtc,
+				     struct drm_crtc_state *old_crtc_state)
+{
+}
+
+static void bochs_crtc_atomic_flush(struct drm_crtc *crtc,
+				    struct drm_crtc_state *old_crtc_state)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_pending_vblank_event *event;
+
+	if (crtc->state && crtc->state->event) {
+		unsigned long irqflags;
+
+		spin_lock_irqsave(&dev->event_lock, irqflags);
+		event = crtc->state->event;
+		crtc->state->event = NULL;
+		drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irqrestore(&dev->event_lock, irqflags);
+	}
+}
+
+
 /* These provide the minimum set of functions required to handle a CRTC */
 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 	.set_config = drm_crtc_helper_set_config,
@@ -128,6 +151,8 @@ static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 	.mode_set_base = bochs_crtc_mode_set_base,
 	.prepare = bochs_crtc_prepare,
 	.commit = bochs_crtc_commit,
+	.atomic_enable = bochs_crtc_atomic_enable,
+	.atomic_flush = bochs_crtc_atomic_flush,
 };
 
 static const uint32_t bochs_formats[] = {