OMAPDSS: APPLY: track whether a manager is enabled

Add "enabled" field to struct omap_overlay_manager, which tells if the
output is enabled or not. This will be used in apply.c in the following
patches.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/apply.c

@@ -657,10 +657,12 @@ int omap_dss_mgr_apply(struct omap_overlay_manager *mgr)
 void dss_mgr_enable(struct omap_overlay_manager *mgr)
 {
 	dispc_mgr_enable(mgr->id, true);
+	mgr->enabled = true;
 }
 
 void dss_mgr_disable(struct omap_overlay_manager *mgr)
 {
 	dispc_mgr_enable(mgr->id, false);
+	mgr->enabled = false;
 }
 

include/video/omapdss.h

@@ -432,6 +432,8 @@ struct omap_overlay_manager {
 	struct omap_dss_device *device;
 	struct omap_overlay_manager_info info;
 
+	bool enabled;
+
 	bool device_changed;
 	/* if true, info has been changed but not applied() yet */
 	bool info_dirty;