drm: add drm_get_connector_force_name

Follow the naming in debugfs also for logging, add "unknown" for values
beyond the enumerated ones.

v2: add \n in connector_show, make internal to drm (Chris)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1487580708-29340-1-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/drm_connector.c

@@ -128,22 +128,8 @@ static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
 		return;
 
 	if (mode->force) {
-		const char *s;
-
-		switch (mode->force) {
-		case DRM_FORCE_OFF:
-			s = "OFF";
-			break;
-		case DRM_FORCE_ON_DIGITAL:
-			s = "ON - dig";
-			break;
-		default:
-		case DRM_FORCE_ON:
-			s = "ON";
-			break;
-		}
-
-		DRM_INFO("forcing %s connector %s\n", connector->name, s);
+		DRM_INFO("forcing %s connector %s\n", connector->name,
+			 drm_get_connector_force_name(mode->force));
 		connector->force = mode->force;
 	}
 
@@ -492,6 +478,28 @@ const char *drm_get_connector_status_name(enum drm_connector_status status)
 }
 EXPORT_SYMBOL(drm_get_connector_status_name);
 
+/**
+ * drm_get_connector_force_name - return a string for connector force
+ * @force: connector force to get name of
+ *
+ * Returns: const pointer to name.
+ */
+const char *drm_get_connector_force_name(enum drm_connector_force force)
+{
+	switch (force) {
+	case DRM_FORCE_UNSPECIFIED:
+		return "unspecified";
+	case DRM_FORCE_OFF:
+		return "off";
+	case DRM_FORCE_ON:
+		return "on";
+	case DRM_FORCE_ON_DIGITAL:
+		return "digital";
+	default:
+		return "unknown";
+	}
+}
+
 #ifdef CONFIG_LOCKDEP
 static struct lockdep_map connector_list_iter_dep_map = {
 	.name = "drm_connector_list_iter"

drivers/gpu/drm/drm_crtc_internal.h

@@ -142,6 +142,7 @@ int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
 				    struct drm_property *property,
 				    uint64_t value);
 int drm_connector_create_standard_properties(struct drm_device *dev);
+const char *drm_get_connector_force_name(enum drm_connector_force force);
 
 /* IOCTL */
 int drm_mode_connector_property_set_ioctl(struct drm_device *dev,

drivers/gpu/drm/drm_debugfs.c

@@ -261,30 +261,8 @@ int drm_debugfs_cleanup(struct drm_minor *minor)
 static int connector_show(struct seq_file *m, void *data)
 {
 	struct drm_connector *connector = m->private;
-	const char *status;
 
-	switch (connector->force) {
-	case DRM_FORCE_ON:
-		status = "on\n";
-		break;
-
-	case DRM_FORCE_ON_DIGITAL:
-		status = "digital\n";
-		break;
-
-	case DRM_FORCE_OFF:
-		status = "off\n";
-		break;
-
-	case DRM_FORCE_UNSPECIFIED:
-		status = "unspecified\n";
-		break;
-
-	default:
-		return 0;
-	}
-
-	seq_puts(m, status);
+	seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 
 	return 0;
 }