* values in advance. This function programs the correct values for
  * DP/eDP/FDI use cases.
  */
-void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder)
+static void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder)
 {
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        u32 iboost_bit = 0;
                   DP_TP_CTL_ENABLE);
 }
 
-void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder)
+static void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder)
 {
        struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
        struct intel_digital_port *intel_dig_port =
        return DDI_BUF_TRANS_SELECT(level);
 }
 
-void intel_ddi_clk_select(struct intel_encoder *encoder,
-                         struct intel_shared_dpll *pll)
+static void intel_ddi_clk_select(struct intel_encoder *encoder,
+                                struct intel_shared_dpll *pll)
 {
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        enum port port = intel_ddi_get_encoder_port(encoder);
 
 void intel_crt_reset(struct drm_encoder *encoder);
 
 /* intel_ddi.c */
-void intel_ddi_clk_select(struct intel_encoder *encoder,
-                         struct intel_shared_dpll *pll);
 void intel_ddi_fdi_post_disable(struct intel_encoder *intel_encoder,
                                struct intel_crtc_state *old_crtc_state,
                                struct drm_connector_state *old_conn_state);
-void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder);
 void hsw_fdi_link_train(struct intel_crtc *crtc,
                        const struct intel_crtc_state *crtc_state);
 void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port);
 void intel_ddi_get_config(struct intel_encoder *encoder,
                          struct intel_crtc_state *pipe_config);
 
-void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder);
 void intel_ddi_clock_get(struct intel_encoder *encoder,
                         struct intel_crtc_state *pipe_config);
 void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,