drm/omap: Remove src field from omap_dss_device structure

The field is only used to check whether the device is connected, and we
can do so by checking the dss field instead. Remove the src field.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/base.c

@@ -176,7 +176,7 @@ EXPORT_SYMBOL(omapdss_device_next_output);
 
 static bool omapdss_device_is_connected(struct omap_dss_device *dssdev)
 {
-	return dssdev->src;
+	return dssdev->dss;
 }
 
 int omapdss_device_connect(struct dss_device *dss,
@@ -198,11 +198,6 @@ int omapdss_device_connect(struct dss_device *dss,
 		return ret;
 	}
 
-	if (src) {
-		WARN_ON(dst->src);
-		dst->src = src;
-	}
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(omapdss_device_connect);
@@ -217,13 +212,6 @@ void omapdss_device_disconnect(struct omap_dss_device *src,
 		return;
 	}
 
-	if (src) {
-		if (WARN_ON(dst->src != src))
-			return;
-
-		dst->src = NULL;
-	}
-
 	WARN_ON(dst->state != OMAP_DSS_DISPLAY_DISABLED);
 
 	dst->ops->disconnect(src, dst);

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -409,7 +409,6 @@ struct omap_dss_device {
 	struct module *owner;
 
 	struct dss_device *dss;
-	struct omap_dss_device *src;
 	struct omap_dss_device *next;
 
 	struct list_head list;