drm/nouveau: shutdown display on suspend/hibernate

Known to fix some serious issues with hibernate on a couple of systems.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -206,6 +206,31 @@ static struct drm_prop_enum_list dither_depth[] = {
 	}                                                                      \
 } while(0)
 
+int
+nouveau_display_init(struct drm_device *dev)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nouveau_display_engine *disp = &dev_priv->engine.display;
+	int ret;
+
+	ret = disp->init(dev);
+	if (ret == 0) {
+		drm_kms_helper_poll_enable(dev);
+	}
+
+	return ret;
+}
+
+void
+nouveau_display_fini(struct drm_device *dev)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nouveau_display_engine *disp = &dev_priv->engine.display;
+
+	drm_kms_helper_poll_disable(dev);
+	disp->fini(dev);
+}
+
 int
 nouveau_display_create(struct drm_device *dev)
 {
@@ -258,13 +283,19 @@ nouveau_display_create(struct drm_device *dev)
 		dev->mode_config.max_height = 8192;
 	}
 
+	drm_kms_helper_poll_init(dev);
+	drm_kms_helper_poll_disable(dev);
+
 	ret = disp->create(dev);
 	if (ret)
 		return ret;
 
-	ret = disp->init(dev);
-	if (ret)
-		disp->destroy(dev);
+	if (dev->mode_config.num_crtc) {
+		ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+		if (ret)
+			return ret;
+	}
+
 	return ret;
 }
 
@@ -274,8 +305,11 @@ nouveau_display_destroy(struct drm_device *dev)
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_display_engine *disp = &dev_priv->engine.display;
 
-	disp->fini(dev);
+	drm_vblank_cleanup(dev);
+
 	disp->destroy(dev);
+
+	drm_kms_helper_poll_fini(dev);
 	drm_mode_config_cleanup(dev);
 }
 

drivers/gpu/drm/nouveau/nouveau_drv.c

@@ -178,7 +178,8 @@ nouveau_pci_suspend(struct pci_dev *pdev, pm_message_t pm_state)
 	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 		return 0;
 
-	drm_kms_helper_poll_disable(dev);
+	NV_INFO(dev, "Disabling display...\n");
+	nouveau_display_fini(dev);
 
 	NV_INFO(dev, "Disabling fbcon...\n");
 	nouveau_fbcon_set_suspend(dev, 1);
@@ -357,8 +358,7 @@ nouveau_pci_resume(struct pci_dev *pdev)
 	nouveau_fbcon_set_suspend(dev, 0);
 	nouveau_fbcon_zfill_all(dev);
 
-	engine->display.init(dev);
-	drm_kms_helper_poll_enable(dev);
+	nouveau_display_init(dev);
 
 	/* Force CLUT to get re-loaded during modeset */
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -1449,6 +1449,8 @@ extern int nouveau_gem_ioctl_info(struct drm_device *, void *,
 /* nouveau_display.c */
 int nouveau_display_create(struct drm_device *dev);
 void nouveau_display_destroy(struct drm_device *dev);
+int nouveau_display_init(struct drm_device *dev);
+void nouveau_display_fini(struct drm_device *dev);
 int nouveau_vblank_enable(struct drm_device *dev, int crtc);
 void nouveau_vblank_disable(struct drm_device *dev, int crtc);
 int nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -763,12 +763,11 @@ nouveau_card_init(struct drm_device *dev)
 	}
 
 	if (dev->mode_config.num_crtc) {
-		ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+		ret = nouveau_display_init(dev);
 		if (ret)
 			goto out_chan;
 
 		nouveau_fbcon_init(dev);
-		drm_kms_helper_poll_init(dev);
 	}
 
 	return 0;
@@ -829,9 +828,8 @@ static void nouveau_card_takedown(struct drm_device *dev)
 	int e;
 
 	if (dev->mode_config.num_crtc) {
-		drm_kms_helper_poll_fini(dev);
 		nouveau_fbcon_fini(dev);
-		drm_vblank_cleanup(dev);
+		nouveau_display_fini(dev);
 	}
 
 	if (dev_priv->channel) {