drm: Remove drm_fb_helper add, add all and remove connector calls

drm_fb_helper_{add,remove}_one_connector() and
drm_fb_helper_single_add_all_connectors() are dummy functions now
and serve no purpose. Hence remove their calls.

This is the preparatory step for removing the
drm_fb_helper_{add,remove}_one_connector() functions from
drm_fb_helper.h

This removal is done using below sementic patch and unused variable
compilation warnings are fixed manually.

@@
@@

- drm_fb_helper_single_add_all_connectors(...);

@@
expression e1;
statement S;
@@
- e1 = drm_fb_helper_single_add_all_connectors(...);
- S

@@
@@

- drm_fb_helper_add_one_connector(...);

@@
@@

- drm_fb_helper_remove_one_connector(...);

Changes since v1:
* Squashed warning fixes into the patch that introduced the
  warnings (into 5/7) (Laurent, Emil, Lyude)
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200305120434.111091-6-pankaj.laxminarayan.bharadiya@intel.com

drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c

@@ -342,8 +342,6 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev)
 		return ret;
 	}
 
-	drm_fb_helper_single_add_all_connectors(&rfbdev->helper);
-
 	/* disable all the possible outputs/crtcs before entering KMS mode */
 	if (!amdgpu_device_has_dc_support(adev))
 		drm_helper_disable_unused_functions(adev->ddev);

drivers/gpu/drm/armada/armada_fbdev.c

@@ -135,12 +135,6 @@ int armada_fbdev_init(struct drm_device *dev)
 		goto err_fb_helper;
 	}
 
-	ret = drm_fb_helper_single_add_all_connectors(fbh);
-	if (ret) {
-		DRM_ERROR("failed to add fb connectors\n");
-		goto err_fb_setup;
-	}
-
 	ret = drm_fb_helper_initial_config(fbh, 32);
 	if (ret) {
 		DRM_ERROR("failed to set initial config\n");

drivers/gpu/drm/bridge/tc358764.c

@@ -375,7 +375,6 @@ static int tc358764_attach(struct drm_bridge *bridge,
 	drm_connector_attach_encoder(&ctx->connector, bridge->encoder);
 	drm_panel_attach(ctx->panel, &ctx->connector);
 	ctx->connector.funcs->reset(&ctx->connector);
-	drm_fb_helper_add_one_connector(drm->fb_helper, &ctx->connector);
 	drm_connector_register(&ctx->connector);
 
 	return 0;
@@ -384,10 +383,8 @@ static int tc358764_attach(struct drm_bridge *bridge,
 static void tc358764_detach(struct drm_bridge *bridge)
 {
 	struct tc358764 *ctx = bridge_to_tc358764(bridge);
-	struct drm_device *drm = bridge->dev;
 
 	drm_connector_unregister(&ctx->connector);
-	drm_fb_helper_remove_one_connector(drm->fb_helper, &ctx->connector);
 	drm_panel_detach(ctx->panel);
 	ctx->panel = NULL;
 	drm_connector_put(&ctx->connector);

drivers/gpu/drm/exynos/exynos_drm_dsi.c

@@ -1514,7 +1514,6 @@ static int exynos_dsi_create_connector(struct drm_encoder *encoder)
 		return 0;
 
 	connector->funcs->reset(connector);
-	drm_fb_helper_add_one_connector(drm->fb_helper, connector);
 	drm_connector_register(connector);
 	return 0;
 }

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

@@ -207,14 +207,6 @@ int exynos_drm_fbdev_init(struct drm_device *dev)
 		goto err_init;
 	}
 
-	ret = drm_fb_helper_single_add_all_connectors(helper);
-	if (ret < 0) {
-		DRM_DEV_ERROR(dev->dev,
-			      "failed to register drm_fb_helper_connector.\n");
-		goto err_setup;
-
-	}
-
 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev->dev,

drivers/gpu/drm/gma500/framebuffer.c

@@ -517,10 +517,6 @@ int psb_fbdev_init(struct drm_device *dev)
 	if (ret)
 		goto free;
 
-	ret = drm_fb_helper_single_add_all_connectors(fb_helper);
-	if (ret)
-		goto fini;
-
 	/* disable all the possible outputs/crtcs before entering KMS mode */
 	drm_helper_disable_unused_functions(dev);
 

drivers/gpu/drm/i915/display/intel_fbdev.c

@@ -462,8 +462,6 @@ int intel_fbdev_init(struct drm_device *dev)
 	dev_priv->fbdev = ifbdev;
 	INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 
-	drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
-
 	return 0;
 }
 

drivers/gpu/drm/msm/msm_fbdev.c

@@ -166,10 +166,6 @@ struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 		goto fail;
 	}
 
-	ret = drm_fb_helper_single_add_all_connectors(helper);
-	if (ret)
-		goto fini;
-
 	/* the fw fb could be anywhere in memory */
 	drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false);
 

drivers/gpu/drm/nouveau/dispnv50/disp.c

@@ -1260,23 +1260,16 @@ static void
 nv50_mstm_destroy_connector(struct drm_dp_mst_topology_mgr *mgr,
 			    struct drm_connector *connector)
 {
-	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct nv50_mstc *mstc = nv50_mstc(connector);
 
 	drm_connector_unregister(&mstc->connector);
 
-	drm_fb_helper_remove_one_connector(&drm->fbcon->helper, &mstc->connector);
-
 	drm_connector_put(&mstc->connector);
 }
 
 static void
 nv50_mstm_register_connector(struct drm_connector *connector)
 {
-	struct nouveau_drm *drm = nouveau_drm(connector->dev);
-
-	drm_fb_helper_add_one_connector(&drm->fbcon->helper, connector);
-
 	drm_connector_register(connector);
 }
 

drivers/gpu/drm/nouveau/nouveau_fbcon.c

@@ -562,10 +562,6 @@ nouveau_fbcon_init(struct drm_device *dev)
 	if (ret)
 		goto free;
 
-	ret = drm_fb_helper_single_add_all_connectors(&fbcon->helper);
-	if (ret)
-		goto fini;
-
 	if (preferred_bpp != 8 && preferred_bpp != 16 && preferred_bpp != 32) {
 		if (drm->client.device.info.ram_size <= 32 * 1024 * 1024)
 			preferred_bpp = 8;

drivers/gpu/drm/omapdrm/omap_fbdev.c

@@ -246,10 +246,6 @@ void omap_fbdev_init(struct drm_device *dev)
 	if (ret)
 		goto fail;
 
-	ret = drm_fb_helper_single_add_all_connectors(helper);
-	if (ret)
-		goto fini;
-
 	ret = drm_fb_helper_initial_config(helper, 32);
 	if (ret)
 		goto fini;

drivers/gpu/drm/radeon/radeon_fb.c

@@ -358,10 +358,6 @@ int radeon_fbdev_init(struct radeon_device *rdev)
 	if (ret)
 		goto free;
 
-	ret = drm_fb_helper_single_add_all_connectors(&rfbdev->helper);
-	if (ret)
-		goto fini;
-
 	/* disable all the possible outputs/crtcs before entering KMS mode */
 	drm_helper_disable_unused_functions(rdev->ddev);
 

drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c

@@ -132,13 +132,6 @@ int rockchip_drm_fbdev_init(struct drm_device *dev)
 		return ret;
 	}
 
-	ret = drm_fb_helper_single_add_all_connectors(helper);
-	if (ret < 0) {
-		DRM_DEV_ERROR(dev->dev,
-			      "Failed to add connectors - %d.\n", ret);
-		goto err_drm_fb_helper_fini;
-	}
-
 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dev->dev,

drivers/gpu/drm/tegra/fb.c

@@ -321,12 +321,6 @@ static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
 		return err;
 	}
 
-	err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
-	if (err < 0) {
-		dev_err(drm->dev, "failed to add connectors: %d\n", err);
-		goto fini;
-	}
-
 	err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 	if (err < 0) {
 		dev_err(drm->dev, "failed to set initial configuration: %d\n",