[PATCH RFC v2 01/24] drm/connector: split drmm_connector_hdmi_init() in 3 parts

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

In preparation for adding hotpluggable bridges we need connectors to be
created dynamically, both regular connectors and HDMI ones.

For non-HDMI connectors drm_connector_init() already has a dynamic
variant, but there is none for HDMI. Creating one would be easy by creating
a mostly-identical copy of drmm_connector_hdmi_init(), but it is a long
function so there would be a lot of duplicated code.

drmm_connector_hdmi_init() currently has 3 sections:

 1. sanity checks
 2. call drmm_connector_init()
 3. initialize HDMI-specific fields not initialized at step 2

For the dynamic variant, sectons 1 and 3 would be an exact copy, while
section 2 needs to be different.

To avoid code duplication, split parts 1 and 3 to subfunctions. The next
commit will introduce the dynamic variant.

No functional changes. Just moving code around.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

---

Changes in v2:
- expanded commit message to clarify rationale
- rebased on current drm-misc-next, which required a full rewrite after
  the signature of drmm_connector_hdmi_init() changed in commit
  400c9ede1ea4 ("drm/connector: Add drmm_connector_hdmi_init() with new
  signature")
- renamed drm_connector_hdmi_init() to drm_connector_hdmi_initialize() as
  or it would look like an HDMI version of drm_connector_init()
---
 drivers/gpu/drm/drm_connector.c | 88 +++++++++++++++++++++++++----------------
 1 file changed, 55 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index d94c86bfed86..f5bd08640d25 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -542,37 +542,11 @@ int drmm_connector_init(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drmm_connector_init);
 
-/**
- * drmm_connector_hdmi_init - Init a preallocated HDMI connector
- * @dev: DRM device
- * @connector: A pointer to the HDMI connector to init
- * @funcs: callbacks for this connector
- * @hdmi_funcs: HDMI-related callbacks and capabilities for this connector
- * @connector_type: user visible type of the connector
- * @ddc: optional pointer to the associated ddc adapter
- *
- * Initialises a preallocated HDMI connector. Connectors can be
- * subclassed as part of driver connector objects.
- *
- * Cleanup is automatically handled with a call to
- * drm_connector_cleanup() in a DRM-managed action.
- *
- * The connector structure should be allocated with drmm_kzalloc().
- *
- * The @drm_connector_funcs.destroy hook must be NULL.
- *
- * Returns:
- * Zero on success, error code on failure.
- */
-int drmm_connector_hdmi_init(struct drm_device *dev,
-			     struct drm_connector *connector,
-			     const struct drm_connector_funcs *funcs,
-			     const struct drm_connector_hdmi_funcs *hdmi_funcs,
-			     int connector_type,
-			     struct i2c_adapter *ddc)
+static int drm_connector_hdmi_sanity_checks(struct drm_device *dev,
+					    struct drm_connector *connector,
+					    const struct drm_connector_hdmi_funcs *hdmi_funcs,
+					    int connector_type)
 {
-	int ret;
-
 	if (!hdmi_funcs)
 		return -EINVAL;
 
@@ -613,9 +587,15 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 	      connector_type == DRM_MODE_CONNECTOR_HDMIB))
 		return -EINVAL;
 
-	ret = drmm_connector_init(dev, connector, funcs, connector_type, ddc);
-	if (ret)
-		return ret;
+	return 0;
+}
+
+/* Initialize HDMI-specific resources of a connector */
+static int drm_connector_hdmi_initialize(struct drm_device *dev,
+					 struct drm_connector *connector,
+					 const struct drm_connector_hdmi_funcs *hdmi_funcs)
+{
+	int ret;
 
 	/* TODO: remove after conversion to new drmm_connector_hdmi_init() */
 	connector->hdmi.supported_formats = hdmi_funcs->supported_formats;
@@ -684,6 +664,48 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 
 	return 0;
 }
+
+/**
+ * drmm_connector_hdmi_init - Init a preallocated HDMI connector
+ * @dev: DRM device
+ * @connector: A pointer to the HDMI connector to init
+ * @funcs: callbacks for this connector
+ * @hdmi_funcs: HDMI-related callbacks and capabilities for this connector
+ * @connector_type: user visible type of the connector
+ * @ddc: optional pointer to the associated ddc adapter
+ *
+ * Initialises a preallocated HDMI connector. Connectors can be
+ * subclassed as part of driver connector objects.
+ *
+ * Cleanup is automatically handled with a call to
+ * drm_connector_cleanup() in a DRM-managed action.
+ *
+ * The connector structure should be allocated with drmm_kzalloc().
+ *
+ * The @drm_connector_funcs.destroy hook must be NULL.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drmm_connector_hdmi_init(struct drm_device *dev,
+			     struct drm_connector *connector,
+			     const struct drm_connector_funcs *funcs,
+			     const struct drm_connector_hdmi_funcs *hdmi_funcs,
+			     int connector_type,
+			     struct i2c_adapter *ddc)
+{
+	int ret;
+
+	ret = drm_connector_hdmi_sanity_checks(dev, connector, hdmi_funcs, connector_type);
+	if (ret)
+		return ret;
+
+	ret = drmm_connector_init(dev, connector, funcs, connector_type, ddc);
+	if (ret)
+		return ret;
+
+	return drm_connector_hdmi_initialize(dev, connector, hdmi_funcs);
+}
 EXPORT_SYMBOL(drmm_connector_hdmi_init);
 
 /**

-- 
2.55.0