drm/nv50: enable page flipping

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -297,6 +297,14 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 	mutex_lock(&chan->mutex);
 
 	/* Emit a page flip */
+	if (dev_priv->card_type >= NV_50) {
+		ret = nv50_display_flip_next(crtc, fb, chan);
+		if (ret) {
+			nouveau_channel_put(&chan);
+			goto fail_unreserve;
+		}
+	}
+
 	ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
 	nouveau_channel_put(&chan);
 	if (ret)
@@ -347,7 +355,8 @@ nouveau_finish_page_flip(struct nouveau_channel *chan,
 	}
 
 	list_del(&s->head);
-	*ps = *s;
+	if (ps)
+		*ps = *s;
 	kfree(s);
 
 	spin_unlock_irqrestore(&dev->event_lock, flags);

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -1118,7 +1118,7 @@ int nouveau_ioctl_getparam(struct drm_device *dev, void *data,
 		getparam->value = 1;
 		break;
 	case NOUVEAU_GETPARAM_HAS_PAGEFLIP:
-		getparam->value = (dev_priv->card_type < NV_50);
+		getparam->value = (dev_priv->card_type < NV_C0) ? 1 : 0;
 		break;
 	case NOUVEAU_GETPARAM_GRAPH_UNITS:
 		/* NV40 and NV50 versions are quite different, but register

drivers/gpu/drm/nouveau/nv50_graph.c

@@ -409,12 +409,7 @@ static int
 nv50_graph_nvsw_mthd_page_flip(struct nouveau_channel *chan,
 			       u32 class, u32 mthd, u32 data)
 {
-	struct nouveau_page_flip_state s;
-
-	if (!nouveau_finish_page_flip(chan, &s)) {
-		/* XXX - Do something here */
-	}
-
+	nouveau_finish_page_flip(chan, NULL);
 	return 0;
 }