drm/omap: dss: Create global list of all omap_dss_device instances

The omap_dss_device instances are stored in two separate lists,
depending on whether they are panels or outputs. Create a third list
that stores all omap_dss_device instances to allow generic code to
operate on all instances.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

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

@@ -14,24 +14,17 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/list.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
-#include <linux/list.h>
 
 #include "dss.h"
 #include "omapdss.h"
 
 static struct dss_device *dss_device;
 
-static struct list_head omapdss_comp_list;
-
-struct omapdss_comp_node {
-	struct list_head list;
-	struct device_node *node;
-	bool dss_core_component;
-};
-
 struct dss_device *omapdss_get_dss(void)
 {
 	return dss_device;
@@ -56,6 +49,40 @@ const struct dispc_ops *dispc_get_ops(struct dss_device *dss)
 }
 EXPORT_SYMBOL(dispc_get_ops);
 
+
+/* -----------------------------------------------------------------------------
+ * OMAP DSS Devices Handling
+ */
+
+static LIST_HEAD(omapdss_devices_list);
+static DEFINE_MUTEX(omapdss_devices_lock);
+
+void omapdss_device_register(struct omap_dss_device *dssdev)
+{
+	mutex_lock(&omapdss_devices_lock);
+	list_add_tail(&dssdev->list, &omapdss_devices_list);
+	mutex_unlock(&omapdss_devices_lock);
+}
+
+void omapdss_device_unregister(struct omap_dss_device *dssdev)
+{
+	mutex_lock(&omapdss_devices_lock);
+	list_del(&dssdev->list);
+	mutex_unlock(&omapdss_devices_lock);
+}
+
+/* -----------------------------------------------------------------------------
+ * Components Handling
+ */
+
+static struct list_head omapdss_comp_list;
+
+struct omapdss_comp_node {
+	struct list_head list;
+	struct device_node *node;
+	bool dss_core_component;
+};
+
 static bool omapdss_list_contains(const struct device_node *node)
 {
 	struct omapdss_comp_node *comp;

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

@@ -56,6 +56,8 @@ int omapdss_register_display(struct omap_dss_device *dssdev)
 	mutex_lock(&panel_list_mutex);
 	list_add_tail(&dssdev->panel_list, &panel_list);
 	mutex_unlock(&panel_list_mutex);
+
+	omapdss_device_register(dssdev);
 	return 0;
 }
 EXPORT_SYMBOL(omapdss_register_display);
@@ -65,6 +67,8 @@ void omapdss_unregister_display(struct omap_dss_device *dssdev)
 	mutex_lock(&panel_list_mutex);
 	list_del(&dssdev->panel_list);
 	mutex_unlock(&panel_list_mutex);
+
+	omapdss_device_register(dssdev);
 }
 EXPORT_SYMBOL(omapdss_unregister_display);
 

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

@@ -450,6 +450,7 @@ struct omap_dss_device {
 
 	struct module *owner;
 
+	struct list_head list;
 	struct list_head panel_list;
 
 	unsigned int alias_id;
@@ -560,6 +561,9 @@ static inline bool omapdss_is_initialized(void)
 int omapdss_register_display(struct omap_dss_device *dssdev);
 void omapdss_unregister_display(struct omap_dss_device *dssdev);
 
+void omapdss_device_register(struct omap_dss_device *dssdev);
+void omapdss_device_unregister(struct omap_dss_device *dssdev);
+
 struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev);
 void omap_dss_put_device(struct omap_dss_device *dssdev);
 #define for_each_dss_dev(d) while ((d = omap_dss_get_next_device(d)) != NULL)

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

@@ -97,6 +97,7 @@ EXPORT_SYMBOL(omapdss_output_unset_device);
 int omapdss_register_output(struct omap_dss_device *out)
 {
 	list_add_tail(&out->output_list, &output_list);
+	omapdss_device_register(out);
 	return 0;
 }
 EXPORT_SYMBOL(omapdss_register_output);
@@ -104,6 +105,7 @@ EXPORT_SYMBOL(omapdss_register_output);
 void omapdss_unregister_output(struct omap_dss_device *out)
 {
 	list_del(&out->output_list);
+	omapdss_device_unregister(out);
 }
 EXPORT_SYMBOL(omapdss_unregister_output);