[PATCH 2/2] drm: simple_kms_helper: add support for bridges

[Andrea Merello]

Introduce drm_simple_display_pipe_attach_bridge() in order
to make it possible to use drm encoders with the simple display
pipes managed by simple_kms_helpers

Suggested-by: Daniel Vetter <daniel at ffwll.ch>
Signed-off-by: Andrea Merello <andrea.merello at gmail.com>
Cc: Noralf Trønnes <noralf at tronnes.org>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: David Airlie <airlied at linux.ie>

diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index 3a48c7c..05ee61d 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -133,6 +133,28 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
 };

 /**
+ * drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
+ * @pipe: simple display pipe object
+ * @bridge: bridge to attach
+ *
+ * Makes it possible to still use the drm_simple_display_pipe helpers when
+ * a DRM bridge has to be used.
+ * Note that you probably want to initialize the pipe by passing a NULL
+ * connector to drm_simple_display_pipe_init()
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
+					struct drm_bridge *bridge)
+{
+	bridge->encoder = &pipe->encoder;
+	pipe->encoder.bridge = bridge;
+	return drm_bridge_attach(pipe->encoder.dev, bridge);
+}
+EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
+
+/**
  * drm_simple_display_pipe_init - Initialize a simple display pipeline
  * @dev: DRM device
  * @pipe: simple display pipe object to initialize
diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
index 2690397..1d73bcf 100644
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -85,6 +85,9 @@ struct drm_simple_display_pipe {
 	const struct drm_simple_display_pipe_funcs *funcs;
 };

+int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
+					struct drm_bridge *bridge);
+
 int drm_simple_display_pipe_init(struct drm_device *dev,
 			struct drm_simple_display_pipe *pipe,
 			const struct drm_simple_display_pipe_funcs *funcs,
--
2.7.4