.vblank_quirk                   = sun4i_backend_vblank_quirk,
 };
 
-static struct regmap_config sun4i_backend_regmap_config = {
+static const struct regmap_config sun4i_backend_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
        .reg_stride     = 4,
 
        .fb_create              = drm_gem_fb_create,
 };
 
-static struct drm_mode_config_helper_funcs sun4i_de_mode_config_helpers = {
+static const struct drm_mode_config_helper_funcs sun4i_de_mode_config_helpers = {
        .atomic_commit_tail     = drm_atomic_helper_commit_tail_rpm,
 };
 
 
 }
 EXPORT_SYMBOL(sun4i_frontend_enable);
 
-static struct regmap_config sun4i_frontend_regmap_config = {
+static const struct regmap_config sun4i_frontend_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
        .reg_stride     = 4,
 
        return drm_panel_get_modes(lvds->panel, connector);
 }
 
-static struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
+static const struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
        .get_modes      = sun4i_lvds_get_modes,
 };
 
 
        return MODE_OK;
 }
 
-static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
+static const struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
        .get_modes      = sun4i_rgb_get_modes,
 };
 
        }
 }
 
-static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
+static const struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
        .disable        = sun4i_rgb_encoder_disable,
        .enable         = sun4i_rgb_encoder_enable,
        .mode_valid     = sun4i_rgb_mode_valid,
 
        return 0;
 }
 
-static struct regmap_config sun4i_tcon_regmap_config = {
+static const struct regmap_config sun4i_tcon_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
        .reg_stride     = 4,
 
        regmap_write(tv->regs, SUN4I_TVE_SLAVE_REG, 0);
 }
 
-static struct drm_encoder_helper_funcs sun4i_tv_helper_funcs = {
+static const struct drm_encoder_helper_funcs sun4i_tv_helper_funcs = {
        .disable        = sun4i_tv_disable,
        .enable         = sun4i_tv_enable,
        .mode_set       = sun4i_tv_mode_set,
        return MODE_OK;
 }
 
-static struct drm_connector_helper_funcs sun4i_tv_comp_connector_helper_funcs = {
+static const struct drm_connector_helper_funcs sun4i_tv_comp_connector_helper_funcs = {
        .get_modes      = sun4i_tv_comp_get_modes,
        .mode_valid     = sun4i_tv_comp_mode_valid,
 };
        .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 };
 
-static struct regmap_config sun4i_tv_regmap_config = {
+static const struct regmap_config sun4i_tv_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
        .reg_stride     = 4,
 
        return drm_panel_get_modes(dsi->panel, connector);
 }
 
-static struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = {
+static const struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = {
        .get_modes      = sun6i_dsi_get_modes,
 };
 
 
        }
 }
 
-static struct regmap_config sun8i_hdmi_phy_regmap_config = {
+static const struct regmap_config sun8i_hdmi_phy_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
        .reg_stride     = 4,
 
        .layers_init    = sun8i_layers_init,
 };
 
-static struct regmap_config sun8i_mixer_regmap_config = {
+static const struct regmap_config sun8i_mixer_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
        .reg_stride     = 4,
 
                              true, zpos, old_zpos);
 }
 
-static struct drm_plane_helper_funcs sun8i_ui_layer_helper_funcs = {
+static const struct drm_plane_helper_funcs sun8i_ui_layer_helper_funcs = {
        .prepare_fb     = drm_gem_fb_prepare_fb,
        .atomic_check   = sun8i_ui_layer_atomic_check,
        .atomic_disable = sun8i_ui_layer_atomic_disable,
 
                              true, zpos, old_zpos);
 }
 
-static struct drm_plane_helper_funcs sun8i_vi_layer_helper_funcs = {
+static const struct drm_plane_helper_funcs sun8i_vi_layer_helper_funcs = {
        .prepare_fb     = drm_gem_fb_prepare_fb,
        .atomic_check   = sun8i_vi_layer_atomic_check,
        .atomic_disable = sun8i_vi_layer_atomic_disable,