drm/arc: Use drmm_mode_config_cleanup

With autocleanup through drm_device management we can delete all the
code. Possible now that there's no confusion against devm_kzalloc'ed
structures anymore.

I inlined arcpgu_setup_mode_config because it's tiny and the newly
needed return value handling would have been more ...

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210112084358.2771527-7-daniel.vetter@ffwll.ch

drivers/gpu/drm/arc/arcpgu_crtc.c

@@ -207,10 +207,8 @@ int arc_pgu_setup_crtc(struct drm_device *drm)
 
 	ret = drm_crtc_init_with_planes(drm, &arcpgu->pipe.crtc, primary, NULL,
 					&arc_pgu_crtc_funcs, NULL);
-	if (ret) {
-		drm_plane_cleanup(primary);
+	if (ret)
 		return ret;
-	}
 
 	drm_crtc_helper_add(&arcpgu->pipe.crtc, &arc_pgu_crtc_helper_funcs);
 	return 0;

drivers/gpu/drm/arc/arcpgu_drv.c

@@ -30,16 +30,6 @@ static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
 	.atomic_commit = drm_atomic_helper_commit,
 };
 
-static void arcpgu_setup_mode_config(struct drm_device *drm)
-{
-	drm_mode_config_init(drm);
-	drm->mode_config.min_width = 0;
-	drm->mode_config.min_height = 0;
-	drm->mode_config.max_width = 1920;
-	drm->mode_config.max_height = 1080;
-	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
-}
-
 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
 
 static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
@@ -54,7 +44,15 @@ static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
 	if (IS_ERR(arcpgu->clk))
 		return PTR_ERR(arcpgu->clk);
 
-	arcpgu_setup_mode_config(drm);
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = 1920;
+	drm->mode_config.max_height = 1080;
+	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
@@ -108,7 +106,6 @@ static int arcpgu_unload(struct drm_device *drm)
 {
 	drm_kms_helper_poll_fini(drm);
 	drm_atomic_helper_shutdown(drm);
-	drm_mode_config_cleanup(drm);
 
 	return 0;
 }

drivers/gpu/drm/arc/arcpgu_hdmi.c

@@ -39,9 +39,5 @@ int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
 		return ret;
 
 	/* Link drm_bridge to encoder */
-	ret = drm_bridge_attach(encoder, bridge, NULL, 0);
-	if (ret)
-		drm_encoder_cleanup(encoder);
-
-	return ret;
+	return drm_bridge_attach(encoder, bridge, NULL, 0);
 }

drivers/gpu/drm/arc/arcpgu_sim.c

@@ -73,21 +73,14 @@ int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
 			DRM_MODE_CONNECTOR_VIRTUAL);
 	if (ret < 0) {
 		dev_err(drm->dev, "failed to initialize drm connector\n");
-		goto error_encoder_cleanup;
+		return ret;
 	}
 
 	ret = drm_connector_attach_encoder(connector, encoder);
 	if (ret < 0) {
 		dev_err(drm->dev, "could not attach connector to encoder\n");
-		goto error_connector_cleanup;
+		return ret;
 	}
 
 	return 0;
-
-error_connector_cleanup:
-	drm_connector_cleanup(connector);
-
-error_encoder_cleanup:
-	drm_encoder_cleanup(encoder);
-	return ret;
 }