[PATCH RFC v2 03/24] drm/display: bridge-connector: split code allocation from initialization

[Luca Ceresoli]

Currently drm_bridge_connector_init() does two things:

 * allocate and initialize the drm_bridge_connector
   (which embeds a drm_connector) using drmm
 * initialize and register the embedded drm_connector

For bridge hotplug drmm allocations are not suitable because a connector
may have to be added and removed multiple times in the lifetime of a card.

In preparation to support that, split out from drm_bridge_connector_init()
the code to allocate the drm_bridge_connector, so new (de)allocation code
can reuse all the initialization code.

Signed-off-by: Luca Ceresoli <luca.ceresoli at bootlin.com>
---
 drivers/gpu/drm/display/drm_bridge_connector.c | 62 ++++++++++++++++----------
 1 file changed, 38 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 81f3e26f6fdf..41b51f0f13ae 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -837,27 +837,11 @@ static void drm_bridge_connector_put_bridges(struct drm_device *dev, void *data)
 	drm_bridge_put(bridge_connector->bridge_hdmi_cec);
 }
 
-/**
- * drm_bridge_connector_init - Initialise a connector for a chain of bridges
- * @drm: the DRM device
- * @encoder: the encoder where the bridge chain starts
- *
- * Create a new &drm_bridge_connector for the @drm device. The connector is
- * allocated, initialised, registered with the @drm device and attached to
- * @encoder.
- *
- * The connector is associated with a chain of bridges that starts at
- * the @encoder. All bridges in the chain shall report bridge operation flags
- * (&drm_bridge->ops) and bridge output type (&drm_bridge->type), and none of
- * them may create a DRM connector directly.
- *
- * Returns a pointer to the new connector on success, or a negative error
- * pointer otherwise.
- */
-struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
-						struct drm_encoder *encoder)
+static struct drm_connector *
+drm_bridge_connector_initialize(struct drm_bridge_connector *bridge_connector,
+				struct drm_device *drm,
+				struct drm_encoder *encoder)
 {
-	struct drm_bridge_connector *bridge_connector;
 	struct drm_connector *connector;
 	struct i2c_adapter *ddc = NULL;
 	struct drm_bridge *panel_bridge __free(drm_bridge_put) = NULL;
@@ -865,10 +849,6 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 	int connector_type;
 	int ret;
 
-	bridge_connector = drmm_kzalloc(drm, sizeof(*bridge_connector), GFP_KERNEL);
-	if (!bridge_connector)
-		return ERR_PTR(-ENOMEM);
-
 	ret = drmm_add_action(drm, drm_bridge_connector_put_bridges, bridge_connector);
 	if (ret)
 		return ERR_PTR(ret);
@@ -1154,4 +1134,38 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 
 	return connector;
 }
+
+/**
+ * drm_bridge_connector_init - Initialise a connector for a chain of bridges
+ * @drm: the DRM device
+ * @encoder: the encoder where the bridge chain starts
+ *
+ * Create a new &drm_bridge_connector for the @drm device. The connector is
+ * allocated, initialised, registered with the @drm device and attached to
+ * @encoder.
+ *
+ * The connector is associated with a chain of bridges that starts at
+ * the @encoder. All bridges in the chain shall report bridge operation flags
+ * (&drm_bridge->ops) and bridge output type (&drm_bridge->type), and none of
+ * them may create a DRM connector directly.
+ *
+ * Returns a pointer to the new connector on success, or a negative error
+ * pointer otherwise.
+ */
+struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
+						struct drm_encoder *encoder)
+{
+	struct drm_bridge_connector *bridge_connector;
+	struct drm_connector *connector;
+
+	bridge_connector = drmm_kzalloc(drm, sizeof(*bridge_connector), GFP_KERNEL);
+	if (!bridge_connector)
+		return ERR_PTR(-ENOMEM);
+
+	connector = drm_bridge_connector_initialize(bridge_connector, drm, encoder);
+	if (IS_ERR(connector))
+		return connector;
+
+	return connector;
+}
 EXPORT_SYMBOL_GPL(drm_bridge_connector_init);

-- 
2.55.0