drm/komeda: Attach scaler to drm as private object

According to the komeda pipeline configuration, attach scaler to drm as
private object.

v2: Rebase
Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c

@@ -60,6 +60,49 @@ static int komeda_layer_obj_add(struct komeda_kms_dev *kms,
 	return 0;
 }
 
+static struct drm_private_state *
+komeda_scaler_atomic_duplicate_state(struct drm_private_obj *obj)
+{
+	struct komeda_scaler_state *st;
+
+	st = kmemdup(obj->state, sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return NULL;
+
+	komeda_component_state_reset(&st->base);
+	__drm_atomic_helper_private_obj_duplicate_state(obj, &st->base.obj);
+
+	return &st->base.obj;
+}
+
+static void
+komeda_scaler_atomic_destroy_state(struct drm_private_obj *obj,
+				   struct drm_private_state *state)
+{
+	kfree(to_scaler_st(priv_to_comp_st(state)));
+}
+
+static const struct drm_private_state_funcs komeda_scaler_obj_funcs = {
+	.atomic_duplicate_state	= komeda_scaler_atomic_duplicate_state,
+	.atomic_destroy_state	= komeda_scaler_atomic_destroy_state,
+};
+
+static int komeda_scaler_obj_add(struct komeda_kms_dev *kms,
+				 struct komeda_scaler *scaler)
+{
+	struct komeda_scaler_state *st;
+
+	st = kzalloc(sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return -ENOMEM;
+
+	st->base.component = &scaler->base;
+	drm_atomic_private_obj_init(&kms->base,
+				    &scaler->base.obj, &st->base.obj,
+				    &komeda_scaler_obj_funcs);
+	return 0;
+}
+
 static struct drm_private_state *
 komeda_compiz_atomic_duplicate_state(struct drm_private_obj *obj)
 {
@@ -258,6 +301,12 @@ int komeda_kms_add_private_objs(struct komeda_kms_dev *kms,
 				return err;
 		}
 
+		for (j = 0; j < pipe->n_scalers; j++) {
+			err = komeda_scaler_obj_add(kms, pipe->scalers[j]);
+			if (err)
+				return err;
+		}
+
 		err = komeda_compiz_obj_add(kms, pipe->compiz);
 		if (err)
 			return err;