[PATCH v2 2/2] drm/tegra: output: rgb: Don't register connector if bridge is used

[Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

We rely on the connector that is created by the bridge, and thus, the
Tegra's output connector is not needed in this case because it will be
an unused connector.

Signed-off-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/gpu/drm/tegra/rgb.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c
index 4be4dfd4a68a..6e6b3fee1d87 100644
--- a/drivers/gpu/drm/tegra/rgb.c
+++ b/drivers/gpu/drm/tegra/rgb.c
@@ -275,21 +275,32 @@ int tegra_dc_rgb_init(struct drm_device *drm, struct tegra_dc *dc)
 	if (!dc->rgb)
 		return -ENODEV;
 
+	drm_encoder_init(drm, &output->encoder, &tegra_rgb_encoder_funcs,
+			 DRM_MODE_ENCODER_LVDS, NULL);
+	drm_encoder_helper_add(&output->encoder,
+			       &tegra_rgb_encoder_helper_funcs);
+
+	/*
+	 * We don't create a parent "output bridge" that sets the
+	 * DRM_BRIDGE_ATTACH_NO_CONNECTOR flag for drm_bridge_attach(),
+	 * and thus, the bridge creates connector for us in this case.
+	 * The output's connector is unused and not needed if bridge is
+	 * used, so skip the connector's registration in this case.
+	 */
+	if (output->bridge)
+		goto init_output;
+
 	drm_connector_init(drm, &output->connector, &tegra_rgb_connector_funcs,
 			   DRM_MODE_CONNECTOR_LVDS);
 	drm_connector_helper_add(&output->connector,
 				 &tegra_rgb_connector_helper_funcs);
 	output->connector.dpms = DRM_MODE_DPMS_OFF;
 
-	drm_encoder_init(drm, &output->encoder, &tegra_rgb_encoder_funcs,
-			 DRM_MODE_ENCODER_LVDS, NULL);
-	drm_encoder_helper_add(&output->encoder,
-			       &tegra_rgb_encoder_helper_funcs);
-
 	drm_connector_attach_encoder(&output->connector,
 					  &output->encoder);
 	drm_connector_register(&output->connector);
 
+init_output:
 	err = tegra_output_init(drm, output);
 	if (err < 0) {
 		dev_err(output->dev, "failed to initialize output: %d\n", err);
-- 
2.26.0