diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 70e0ff41070cbb174cd6b78008f230470d05b861..a77dd80a97f22dcac2602e301f6f3a2dd8bc2b5c 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -143,7 +143,7 @@ static void hsw_crt_get_config(struct intel_encoder *encoder,
 /* Note: The caller is required to filter out dpms modes not supported by the
  * platform. */
 static void intel_crt_set_dpms(struct intel_encoder *encoder,
-			       struct intel_crtc_state *crtc_state,
+			       const struct intel_crtc_state *crtc_state,
 			       int mode)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -194,28 +194,28 @@ static void intel_crt_set_dpms(struct intel_encoder *encoder,
 }
 
 static void intel_disable_crt(struct intel_encoder *encoder,
-			      struct intel_crtc_state *old_crtc_state,
-			      struct drm_connector_state *old_conn_state)
+			      const struct intel_crtc_state *old_crtc_state,
+			      const struct drm_connector_state *old_conn_state)
 {
 	intel_crt_set_dpms(encoder, old_crtc_state, DRM_MODE_DPMS_OFF);
 }
 
 static void pch_disable_crt(struct intel_encoder *encoder,
-			    struct intel_crtc_state *old_crtc_state,
-			    struct drm_connector_state *old_conn_state)
+			    const struct intel_crtc_state *old_crtc_state,
+			    const struct drm_connector_state *old_conn_state)
 {
 }
 
 static void pch_post_disable_crt(struct intel_encoder *encoder,
-				 struct intel_crtc_state *old_crtc_state,
-				 struct drm_connector_state *old_conn_state)
+				 const struct intel_crtc_state *old_crtc_state,
+				 const struct drm_connector_state *old_conn_state)
 {
 	intel_disable_crt(encoder, old_crtc_state, old_conn_state);
 }
 
 static void hsw_post_disable_crt(struct intel_encoder *encoder,
-				 struct intel_crtc_state *old_crtc_state,
-				 struct drm_connector_state *old_conn_state)
+				 const struct intel_crtc_state *old_crtc_state,
+				 const struct drm_connector_state *old_conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 
@@ -228,8 +228,8 @@ static void hsw_post_disable_crt(struct intel_encoder *encoder,
 }
 
 static void intel_enable_crt(struct intel_encoder *encoder,
-			     struct intel_crtc_state *pipe_config,
-			     struct drm_connector_state *conn_state)
+			     const struct intel_crtc_state *pipe_config,
+			     const struct drm_connector_state *conn_state)
 {
 	intel_crt_set_dpms(encoder, pipe_config, DRM_MODE_DPMS_ON);
 }
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index b5db2ac6bd84c36a6159fb21414d12a5d3bd0a5f..0a316a6ccb5089847eef1b716af25af136be4db6 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -785,7 +785,7 @@ static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
 	DRM_ERROR("Timeout waiting for DDI BUF %c idle bit\n", port_name(port));
 }
 
-static uint32_t hsw_pll_to_ddi_pll_sel(struct intel_shared_dpll *pll)
+static uint32_t hsw_pll_to_ddi_pll_sel(const struct intel_shared_dpll *pll)
 {
 	switch (pll->id) {
 	case DPLL_ID_WRPLL1:
@@ -2080,7 +2080,7 @@ uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
 }
 
 static void intel_ddi_clk_select(struct intel_encoder *encoder,
-				 struct intel_shared_dpll *pll)
+				 const 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);
@@ -2153,7 +2153,7 @@ static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
 				      bool has_infoframe,
 				      const struct intel_crtc_state *crtc_state,
 				      const struct drm_connector_state *conn_state,
-				      struct intel_shared_dpll *pll)
+				      const struct intel_shared_dpll *pll)
 {
 	struct intel_digital_port *intel_dig_port = enc_to_dig_port(&encoder->base);
 	struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
@@ -2182,8 +2182,8 @@ static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
 }
 
 static void intel_ddi_pre_enable(struct intel_encoder *encoder,
-				 struct intel_crtc_state *pipe_config,
-				 struct drm_connector_state *conn_state)
+				 const struct intel_crtc_state *pipe_config,
+				 const struct drm_connector_state *conn_state)
 {
 	int type = encoder->type;
 
@@ -2204,8 +2204,8 @@ static void intel_ddi_pre_enable(struct intel_encoder *encoder,
 }
 
 static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
-				   struct intel_crtc_state *old_crtc_state,
-				   struct drm_connector_state *old_conn_state)
+				   const struct intel_crtc_state *old_crtc_state,
+				   const struct drm_connector_state *old_conn_state)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
@@ -2270,8 +2270,8 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
 }
 
 void intel_ddi_fdi_post_disable(struct intel_encoder *encoder,
-				struct intel_crtc_state *old_crtc_state,
-				struct drm_connector_state *old_conn_state)
+				const struct intel_crtc_state *old_crtc_state,
+				const struct drm_connector_state *old_conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	uint32_t val;
@@ -2303,8 +2303,8 @@ void intel_ddi_fdi_post_disable(struct intel_encoder *encoder,
 }
 
 static void intel_enable_ddi(struct intel_encoder *intel_encoder,
-			     struct intel_crtc_state *pipe_config,
-			     struct drm_connector_state *conn_state)
+			     const struct intel_crtc_state *pipe_config,
+			     const struct drm_connector_state *conn_state)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
@@ -2344,8 +2344,8 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
 }
 
 static void intel_disable_ddi(struct intel_encoder *intel_encoder,
-			      struct intel_crtc_state *old_crtc_state,
-			      struct drm_connector_state *old_conn_state)
+			      const struct intel_crtc_state *old_crtc_state,
+			      const struct drm_connector_state *old_conn_state)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
 	int type = intel_encoder->type;
@@ -2369,8 +2369,8 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
 }
 
 static void bxt_ddi_pre_pll_enable(struct intel_encoder *encoder,
-				   struct intel_crtc_state *pipe_config,
-				   struct drm_connector_state *conn_state)
+				   const struct intel_crtc_state *pipe_config,
+				   const struct drm_connector_state *conn_state)
 {
 	uint8_t mask = pipe_config->lane_lat_optim_mask;
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index dc5b1064bfe150112cdd13653d34bc753862a5b1..d3e5fdf0d2fa3769cd64a8b56518043c77c4c6d9 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1861,7 +1861,7 @@ void intel_dp_set_link_params(struct intel_dp *intel_dp,
 }
 
 static void intel_dp_prepare(struct intel_encoder *encoder,
-			     struct intel_crtc_state *pipe_config)
+			     const struct intel_crtc_state *pipe_config)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -2461,7 +2461,7 @@ static void assert_edp_pll(struct drm_i915_private *dev_priv, bool state)
 #define assert_edp_pll_disabled(d) assert_edp_pll((d), false)
 
 static void ironlake_edp_pll_on(struct intel_dp *intel_dp,
-				struct intel_crtc_state *pipe_config)
+				const struct intel_crtc_state *pipe_config)
 {
 	struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -2688,8 +2688,8 @@ static void intel_dp_get_config(struct intel_encoder *encoder,
 }
 
 static void intel_disable_dp(struct intel_encoder *encoder,
-			     struct intel_crtc_state *old_crtc_state,
-			     struct drm_connector_state *old_conn_state)
+			     const struct intel_crtc_state *old_crtc_state,
+			     const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -2713,8 +2713,8 @@ static void intel_disable_dp(struct intel_encoder *encoder,
 }
 
 static void ilk_post_disable_dp(struct intel_encoder *encoder,
-				struct intel_crtc_state *old_crtc_state,
-				struct drm_connector_state *old_conn_state)
+				const struct intel_crtc_state *old_crtc_state,
+				const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	enum port port = dp_to_dig_port(intel_dp)->port;
@@ -2727,8 +2727,8 @@ static void ilk_post_disable_dp(struct intel_encoder *encoder,
 }
 
 static void vlv_post_disable_dp(struct intel_encoder *encoder,
-				struct intel_crtc_state *old_crtc_state,
-				struct drm_connector_state *old_conn_state)
+				const struct intel_crtc_state *old_crtc_state,
+				const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
@@ -2736,8 +2736,8 @@ static void vlv_post_disable_dp(struct intel_encoder *encoder,
 }
 
 static void chv_post_disable_dp(struct intel_encoder *encoder,
-				struct intel_crtc_state *old_crtc_state,
-				struct drm_connector_state *old_conn_state)
+				const struct intel_crtc_state *old_crtc_state,
+				const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	struct drm_device *dev = encoder->base.dev;
@@ -2842,7 +2842,7 @@ _intel_dp_set_link_train(struct intel_dp *intel_dp,
 }
 
 static void intel_dp_enable_port(struct intel_dp *intel_dp,
-				 struct intel_crtc_state *old_crtc_state)
+				 const struct intel_crtc_state *old_crtc_state)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -2866,8 +2866,8 @@ static void intel_dp_enable_port(struct intel_dp *intel_dp,
 }
 
 static void intel_enable_dp(struct intel_encoder *encoder,
-			    struct intel_crtc_state *pipe_config,
-			    struct drm_connector_state *conn_state)
+			    const struct intel_crtc_state *pipe_config,
+			    const struct drm_connector_state *conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	struct drm_device *dev = encoder->base.dev;
@@ -2914,16 +2914,16 @@ static void intel_enable_dp(struct intel_encoder *encoder,
 }
 
 static void g4x_enable_dp(struct intel_encoder *encoder,
-			  struct intel_crtc_state *pipe_config,
-			  struct drm_connector_state *conn_state)
+			  const struct intel_crtc_state *pipe_config,
+			  const struct drm_connector_state *conn_state)
 {
 	intel_enable_dp(encoder, pipe_config, conn_state);
 	intel_edp_backlight_on(pipe_config, conn_state);
 }
 
 static void vlv_enable_dp(struct intel_encoder *encoder,
-			  struct intel_crtc_state *pipe_config,
-			  struct drm_connector_state *conn_state)
+			  const struct intel_crtc_state *pipe_config,
+			  const struct drm_connector_state *conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
@@ -2932,8 +2932,8 @@ static void vlv_enable_dp(struct intel_encoder *encoder,
 }
 
 static void g4x_pre_enable_dp(struct intel_encoder *encoder,
-			      struct intel_crtc_state *pipe_config,
-			      struct drm_connector_state *conn_state)
+			      const struct intel_crtc_state *pipe_config,
+			      const struct drm_connector_state *conn_state)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	enum port port = dp_to_dig_port(intel_dp)->port;
@@ -3055,8 +3055,8 @@ static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp)
 }
 
 static void vlv_pre_enable_dp(struct intel_encoder *encoder,
-			      struct intel_crtc_state *pipe_config,
-			      struct drm_connector_state *conn_state)
+			      const struct intel_crtc_state *pipe_config,
+			      const struct drm_connector_state *conn_state)
 {
 	vlv_phy_pre_encoder_enable(encoder);
 
@@ -3064,8 +3064,8 @@ static void vlv_pre_enable_dp(struct intel_encoder *encoder,
 }
 
 static void vlv_dp_pre_pll_enable(struct intel_encoder *encoder,
-				  struct intel_crtc_state *pipe_config,
-				  struct drm_connector_state *conn_state)
+				  const struct intel_crtc_state *pipe_config,
+				  const struct drm_connector_state *conn_state)
 {
 	intel_dp_prepare(encoder, pipe_config);
 
@@ -3073,8 +3073,8 @@ static void vlv_dp_pre_pll_enable(struct intel_encoder *encoder,
 }
 
 static void chv_pre_enable_dp(struct intel_encoder *encoder,
-			      struct intel_crtc_state *pipe_config,
-			      struct drm_connector_state *conn_state)
+			      const struct intel_crtc_state *pipe_config,
+			      const struct drm_connector_state *conn_state)
 {
 	chv_phy_pre_encoder_enable(encoder);
 
@@ -3085,8 +3085,8 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder,
 }
 
 static void chv_dp_pre_pll_enable(struct intel_encoder *encoder,
-				  struct intel_crtc_state *pipe_config,
-				  struct drm_connector_state *conn_state)
+				  const struct intel_crtc_state *pipe_config,
+				  const struct drm_connector_state *conn_state)
 {
 	intel_dp_prepare(encoder, pipe_config);
 
@@ -3094,8 +3094,8 @@ static void chv_dp_pre_pll_enable(struct intel_encoder *encoder,
 }
 
 static void chv_dp_post_pll_disable(struct intel_encoder *encoder,
-				    struct intel_crtc_state *pipe_config,
-				    struct drm_connector_state *conn_state)
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
 {
 	chv_phy_post_pll_disable(encoder);
 }
@@ -5450,7 +5450,7 @@ static void intel_dp_pps_init(struct drm_device *dev,
  * The caller of this function needs to take a lock on dev_priv->drrs.
  */
 static void intel_dp_set_drrs_state(struct drm_i915_private *dev_priv,
-				    struct intel_crtc_state *crtc_state,
+				    const struct intel_crtc_state *crtc_state,
 				    int refresh_rate)
 {
 	struct intel_encoder *encoder;
@@ -5547,7 +5547,7 @@ static void intel_dp_set_drrs_state(struct drm_i915_private *dev_priv,
  * Initializes frontbuffer_bits and drrs.dp
  */
 void intel_edp_drrs_enable(struct intel_dp *intel_dp,
-			   struct intel_crtc_state *crtc_state)
+			   const struct intel_crtc_state *crtc_state)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -5578,7 +5578,7 @@ void intel_edp_drrs_enable(struct intel_dp *intel_dp,
  *
  */
 void intel_edp_drrs_disable(struct intel_dp *intel_dp,
-			    struct intel_crtc_state *old_crtc_state)
+			    const struct intel_crtc_state *old_crtc_state)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 	struct drm_i915_private *dev_priv = to_i915(dev);
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 93fc8ab9bb31813f59242ab303942d0bf8473621..8e3aad0ea60be94a3ab6fd7a6b63ca9ba21aba21 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -123,8 +123,8 @@ static int intel_dp_mst_atomic_check(struct drm_connector *connector,
 }
 
 static void intel_mst_disable_dp(struct intel_encoder *encoder,
-				 struct intel_crtc_state *old_crtc_state,
-				 struct drm_connector_state *old_conn_state)
+				 const struct intel_crtc_state *old_crtc_state,
+				 const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 	struct intel_digital_port *intel_dig_port = intel_mst->primary;
@@ -146,8 +146,8 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
 }
 
 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
-				      struct intel_crtc_state *old_crtc_state,
-				      struct drm_connector_state *old_conn_state)
+				      const struct intel_crtc_state *old_crtc_state,
+				      const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 	struct intel_digital_port *intel_dig_port = intel_mst->primary;
@@ -176,8 +176,8 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 }
 
 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
-				    struct intel_crtc_state *pipe_config,
-				    struct drm_connector_state *conn_state)
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
 {
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 	struct intel_digital_port *intel_dig_port = intel_mst->primary;
@@ -219,8 +219,8 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 }
 
 static void intel_mst_enable_dp(struct intel_encoder *encoder,
-				struct intel_crtc_state *pipe_config,
-				struct drm_connector_state *conn_state)
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
 {
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
 	struct intel_digital_port *intel_dig_port = intel_mst->primary;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 987db690a3d4d07e0c969ff6417ec3aeb0926fd1..7527ebe8500a86dfcbd571888b22f0e07ee9a81a 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -220,23 +220,23 @@ struct intel_encoder {
 			       struct intel_crtc_state *,
 			       struct drm_connector_state *);
 	void (*pre_pll_enable)(struct intel_encoder *,
-			       struct intel_crtc_state *,
-			       struct drm_connector_state *);
+			       const struct intel_crtc_state *,
+			       const struct drm_connector_state *);
 	void (*pre_enable)(struct intel_encoder *,
-			   struct intel_crtc_state *,
-			   struct drm_connector_state *);
+			   const struct intel_crtc_state *,
+			   const struct drm_connector_state *);
 	void (*enable)(struct intel_encoder *,
-		       struct intel_crtc_state *,
-		       struct drm_connector_state *);
+		       const struct intel_crtc_state *,
+		       const struct drm_connector_state *);
 	void (*disable)(struct intel_encoder *,
-			struct intel_crtc_state *,
-			struct drm_connector_state *);
+			const struct intel_crtc_state *,
+			const struct drm_connector_state *);
 	void (*post_disable)(struct intel_encoder *,
-			     struct intel_crtc_state *,
-			     struct drm_connector_state *);
+			     const struct intel_crtc_state *,
+			     const struct drm_connector_state *);
 	void (*post_pll_disable)(struct intel_encoder *,
-				 struct intel_crtc_state *,
-				 struct drm_connector_state *);
+				 const struct intel_crtc_state *,
+				 const struct drm_connector_state *);
 	/* Read out the current hw state of this connector, returning true if
 	 * the encoder is active. If the encoder is enabled it also set the pipe
 	 * it is connected to in the pipe parameter. */
@@ -1247,8 +1247,8 @@ void intel_crt_reset(struct drm_encoder *encoder);
 
 /* intel_ddi.c */
 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);
+				const struct intel_crtc_state *old_crtc_state,
+				const struct drm_connector_state *old_conn_state);
 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);
@@ -1520,9 +1520,9 @@ void intel_power_sequencer_reset(struct drm_i915_private *dev_priv);
 uint32_t intel_dp_pack_aux(const uint8_t *src, int src_bytes);
 void intel_plane_destroy(struct drm_plane *plane);
 void intel_edp_drrs_enable(struct intel_dp *intel_dp,
-			   struct intel_crtc_state *crtc_state);
+			   const struct intel_crtc_state *crtc_state);
 void intel_edp_drrs_disable(struct intel_dp *intel_dp,
-			   struct intel_crtc_state *crtc_state);
+			    const struct intel_crtc_state *crtc_state);
 void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
 			       unsigned int frontbuffer_bits);
 void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index f0c11aec5ea5c99933f4243d9ce408692cd66cda..2a0f5d337beac9da05c5143c07a4ebb54b0c684b 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -731,7 +731,7 @@ static void intel_dsi_port_disable(struct intel_encoder *encoder)
 }
 
 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
-			      struct intel_crtc_state *pipe_config);
+			      const struct intel_crtc_state *pipe_config);
 static void intel_dsi_unprepare(struct intel_encoder *encoder);
 
 static void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec)
@@ -783,8 +783,8 @@ static void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec)
  */
 
 static void intel_dsi_pre_enable(struct intel_encoder *encoder,
-				 struct intel_crtc_state *pipe_config,
-				 struct drm_connector_state *conn_state)
+				 const struct intel_crtc_state *pipe_config,
+				 const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
@@ -878,8 +878,8 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder,
  * the pre_enable hook.
  */
 static void intel_dsi_enable_nop(struct intel_encoder *encoder,
-				 struct intel_crtc_state *pipe_config,
-				 struct drm_connector_state *conn_state)
+				 const struct intel_crtc_state *pipe_config,
+				 const struct drm_connector_state *conn_state)
 {
 	DRM_DEBUG_KMS("\n");
 }
@@ -889,8 +889,8 @@ static void intel_dsi_enable_nop(struct intel_encoder *encoder,
  * the post_disable hook.
  */
 static void intel_dsi_disable(struct intel_encoder *encoder,
-			      struct intel_crtc_state *old_crtc_state,
-			      struct drm_connector_state *old_conn_state)
+			      const struct intel_crtc_state *old_crtc_state,
+			      const struct drm_connector_state *old_conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -936,8 +936,8 @@ static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
 }
 
 static void intel_dsi_post_disable(struct intel_encoder *encoder,
-				   struct intel_crtc_state *pipe_config,
-				   struct drm_connector_state *conn_state)
+				   const struct intel_crtc_state *pipe_config,
+				   const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
@@ -1077,7 +1077,7 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
 }
 
 static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
-				 struct intel_crtc_state *pipe_config)
+				    struct intel_crtc_state *pipe_config)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1381,7 +1381,7 @@ static u32 pixel_format_to_reg(enum mipi_dsi_pixel_format fmt)
 }
 
 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
-			      struct intel_crtc_state *pipe_config)
+			      const struct intel_crtc_state *pipe_config)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_device *dev = encoder->dev;
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index c0a027274c0661570b1dc1c69ecbcbc3f3039f76..5c562e1f56ae57b5c628cef0a96318eb71ceda31 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -175,8 +175,8 @@ static void intel_dvo_get_config(struct intel_encoder *encoder,
 }
 
 static void intel_disable_dvo(struct intel_encoder *encoder,
-			      struct intel_crtc_state *old_crtc_state,
-			      struct drm_connector_state *old_conn_state)
+			      const struct intel_crtc_state *old_crtc_state,
+			      const struct drm_connector_state *old_conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
@@ -189,8 +189,8 @@ static void intel_disable_dvo(struct intel_encoder *encoder,
 }
 
 static void intel_enable_dvo(struct intel_encoder *encoder,
-			     struct intel_crtc_state *pipe_config,
-			     struct drm_connector_state *conn_state)
+			     const struct intel_crtc_state *pipe_config,
+			     const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
@@ -258,8 +258,8 @@ static bool intel_dvo_compute_config(struct intel_encoder *encoder,
 }
 
 static void intel_dvo_pre_enable(struct intel_encoder *encoder,
-				 struct intel_crtc_state *pipe_config,
-				 struct drm_connector_state *conn_state)
+				 const struct intel_crtc_state *pipe_config,
+				 const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 65083876294d254c39f964e545d82c30c5b1cd2a..e6f8f30ce7bdc9e4d77196ab6aacaad5c250d86e 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -992,8 +992,8 @@ static void intel_hdmi_get_config(struct intel_encoder *encoder,
 }
 
 static void intel_enable_hdmi_audio(struct intel_encoder *encoder,
-				    struct intel_crtc_state *pipe_config,
-				    struct drm_connector_state *conn_state)
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 
@@ -1004,8 +1004,8 @@ static void intel_enable_hdmi_audio(struct intel_encoder *encoder,
 }
 
 static void g4x_enable_hdmi(struct intel_encoder *encoder,
-			    struct intel_crtc_state *pipe_config,
-			    struct drm_connector_state *conn_state)
+			    const struct intel_crtc_state *pipe_config,
+			    const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1026,8 +1026,8 @@ static void g4x_enable_hdmi(struct intel_encoder *encoder,
 }
 
 static void ibx_enable_hdmi(struct intel_encoder *encoder,
-			    struct intel_crtc_state *pipe_config,
-			    struct drm_connector_state *conn_state)
+			    const struct intel_crtc_state *pipe_config,
+			    const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1076,8 +1076,8 @@ static void ibx_enable_hdmi(struct intel_encoder *encoder,
 }
 
 static void cpt_enable_hdmi(struct intel_encoder *encoder,
-			    struct intel_crtc_state *pipe_config,
-			    struct drm_connector_state *conn_state)
+			    const struct intel_crtc_state *pipe_config,
+			    const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1131,14 +1131,14 @@ static void cpt_enable_hdmi(struct intel_encoder *encoder,
 }
 
 static void vlv_enable_hdmi(struct intel_encoder *encoder,
-			    struct intel_crtc_state *pipe_config,
-			    struct drm_connector_state *conn_state)
+			    const struct intel_crtc_state *pipe_config,
+			    const struct drm_connector_state *conn_state)
 {
 }
 
 static void intel_disable_hdmi(struct intel_encoder *encoder,
-			       struct intel_crtc_state *old_crtc_state,
-			       struct drm_connector_state *old_conn_state)
+			       const struct intel_crtc_state *old_crtc_state,
+			       const struct drm_connector_state *old_conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1194,8 +1194,8 @@ static void intel_disable_hdmi(struct intel_encoder *encoder,
 }
 
 static void g4x_disable_hdmi(struct intel_encoder *encoder,
-			     struct intel_crtc_state *old_crtc_state,
-			     struct drm_connector_state *old_conn_state)
+			     const struct intel_crtc_state *old_crtc_state,
+			     const struct drm_connector_state *old_conn_state)
 {
 	if (old_crtc_state->has_audio)
 		intel_audio_codec_disable(encoder);
@@ -1204,16 +1204,16 @@ static void g4x_disable_hdmi(struct intel_encoder *encoder,
 }
 
 static void pch_disable_hdmi(struct intel_encoder *encoder,
-			     struct intel_crtc_state *old_crtc_state,
-			     struct drm_connector_state *old_conn_state)
+			     const struct intel_crtc_state *old_crtc_state,
+			     const struct drm_connector_state *old_conn_state)
 {
 	if (old_crtc_state->has_audio)
 		intel_audio_codec_disable(encoder);
 }
 
 static void pch_post_disable_hdmi(struct intel_encoder *encoder,
-				  struct intel_crtc_state *old_crtc_state,
-				  struct drm_connector_state *old_conn_state)
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
 {
 	intel_disable_hdmi(encoder, old_crtc_state, old_conn_state);
 }
@@ -1318,7 +1318,7 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
 	return status;
 }
 
-static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state)
+static bool hdmi_12bpc_possible(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv =
 		to_i915(crtc_state->base.crtc->dev);
@@ -1646,8 +1646,8 @@ static int intel_hdmi_get_modes(struct drm_connector *connector)
 }
 
 static void intel_hdmi_pre_enable(struct intel_encoder *encoder,
-				  struct intel_crtc_state *pipe_config,
-				  struct drm_connector_state *conn_state)
+				  const struct intel_crtc_state *pipe_config,
+				  const struct drm_connector_state *conn_state)
 {
 	struct intel_digital_port *intel_dig_port =
 		enc_to_dig_port(&encoder->base);
@@ -1660,8 +1660,8 @@ static void intel_hdmi_pre_enable(struct intel_encoder *encoder,
 }
 
 static void vlv_hdmi_pre_enable(struct intel_encoder *encoder,
-				struct intel_crtc_state *pipe_config,
-				struct drm_connector_state *conn_state)
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
 {
 	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
 	struct drm_device *dev = encoder->base.dev;
@@ -1683,8 +1683,8 @@ static void vlv_hdmi_pre_enable(struct intel_encoder *encoder,
 }
 
 static void vlv_hdmi_pre_pll_enable(struct intel_encoder *encoder,
-				    struct intel_crtc_state *pipe_config,
-				    struct drm_connector_state *conn_state)
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
 {
 	intel_hdmi_prepare(encoder, pipe_config);
 
@@ -1692,8 +1692,8 @@ static void vlv_hdmi_pre_pll_enable(struct intel_encoder *encoder,
 }
 
 static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder,
-				    struct intel_crtc_state *pipe_config,
-				    struct drm_connector_state *conn_state)
+				    const struct intel_crtc_state *pipe_config,
+				    const struct drm_connector_state *conn_state)
 {
 	intel_hdmi_prepare(encoder, pipe_config);
 
@@ -1701,23 +1701,23 @@ static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder,
 }
 
 static void chv_hdmi_post_pll_disable(struct intel_encoder *encoder,
-				      struct intel_crtc_state *old_crtc_state,
-				      struct drm_connector_state *old_conn_state)
+				      const struct intel_crtc_state *old_crtc_state,
+				      const struct drm_connector_state *old_conn_state)
 {
 	chv_phy_post_pll_disable(encoder);
 }
 
 static void vlv_hdmi_post_disable(struct intel_encoder *encoder,
-				  struct intel_crtc_state *old_crtc_state,
-				  struct drm_connector_state *old_conn_state)
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
 {
 	/* Reset lanes to avoid HDMI flicker (VLV w/a) */
 	vlv_phy_reset_lanes(encoder);
 }
 
 static void chv_hdmi_post_disable(struct intel_encoder *encoder,
-				  struct intel_crtc_state *old_crtc_state,
-				  struct drm_connector_state *old_conn_state)
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1731,8 +1731,8 @@ static void chv_hdmi_post_disable(struct intel_encoder *encoder,
 }
 
 static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
-				struct intel_crtc_state *pipe_config,
-				struct drm_connector_state *conn_state)
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
 {
 	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
 	struct drm_device *dev = encoder->base.dev;
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 8e215777c7f49460499e23a915a1a4b88366838e..a9813aea89d8ca1383254d7d2907e768aaa62e5b 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -229,8 +229,8 @@ static void intel_lvds_pps_init_hw(struct drm_i915_private *dev_priv,
 }
 
 static void intel_pre_enable_lvds(struct intel_encoder *encoder,
-				  struct intel_crtc_state *pipe_config,
-				  struct drm_connector_state *conn_state)
+				  const struct intel_crtc_state *pipe_config,
+				  const struct drm_connector_state *conn_state)
 {
 	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -306,8 +306,8 @@ static void intel_pre_enable_lvds(struct intel_encoder *encoder,
  * Sets the power state for the panel.
  */
 static void intel_enable_lvds(struct intel_encoder *encoder,
-			      struct intel_crtc_state *pipe_config,
-			      struct drm_connector_state *conn_state)
+			      const struct intel_crtc_state *pipe_config,
+			      const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
@@ -324,8 +324,8 @@ static void intel_enable_lvds(struct intel_encoder *encoder,
 }
 
 static void intel_disable_lvds(struct intel_encoder *encoder,
-			       struct intel_crtc_state *old_crtc_state,
-			       struct drm_connector_state *old_conn_state)
+			       const struct intel_crtc_state *old_crtc_state,
+			       const struct drm_connector_state *old_conn_state)
 {
 	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -339,8 +339,8 @@ static void intel_disable_lvds(struct intel_encoder *encoder,
 }
 
 static void gmch_disable_lvds(struct intel_encoder *encoder,
-			      struct intel_crtc_state *old_crtc_state,
-			      struct drm_connector_state *old_conn_state)
+			      const struct intel_crtc_state *old_crtc_state,
+			      const struct drm_connector_state *old_conn_state)
 
 {
 	intel_panel_disable_backlight(old_conn_state);
@@ -349,15 +349,15 @@ static void gmch_disable_lvds(struct intel_encoder *encoder,
 }
 
 static void pch_disable_lvds(struct intel_encoder *encoder,
-			     struct intel_crtc_state *old_crtc_state,
-			     struct drm_connector_state *old_conn_state)
+			     const struct intel_crtc_state *old_crtc_state,
+			     const struct drm_connector_state *old_conn_state)
 {
 	intel_panel_disable_backlight(old_conn_state);
 }
 
 static void pch_post_disable_lvds(struct intel_encoder *encoder,
-				  struct intel_crtc_state *old_crtc_state,
-				  struct drm_connector_state *old_conn_state)
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
 {
 	intel_disable_lvds(encoder, old_crtc_state, old_conn_state);
 }
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 3dc38c2ef4c35d6c3e50348bd60580eb9d500d16..9509a18eb00d84f286d525ac7802f7a2da3bd049 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -201,11 +201,8 @@ to_intel_sdvo_connector(struct drm_connector *connector)
 	return container_of(connector, struct intel_sdvo_connector, base.base);
 }
 
-static struct intel_sdvo_connector_state *
-to_intel_sdvo_connector_state(struct drm_connector_state *conn_state)
-{
-	return container_of(conn_state, struct intel_sdvo_connector_state, base.base);
-}
+#define to_intel_sdvo_connector_state(conn_state) \
+	container_of((conn_state), struct intel_sdvo_connector_state, base.base)
 
 static bool
 intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, uint16_t flags);
@@ -998,7 +995,7 @@ static bool intel_sdvo_write_infoframe(struct intel_sdvo *intel_sdvo,
 }
 
 static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo,
-					 struct intel_crtc_state *pipe_config)
+					 const struct intel_crtc_state *pipe_config)
 {
 	uint8_t sdvo_data[HDMI_INFOFRAME_SIZE(AVI)];
 	union hdmi_infoframe frame;
@@ -1032,7 +1029,7 @@ static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo,
 }
 
 static bool intel_sdvo_set_tv_format(struct intel_sdvo *intel_sdvo,
-				     struct drm_connector_state *conn_state)
+				     const struct drm_connector_state *conn_state)
 {
 	struct intel_sdvo_tv_format format;
 	uint32_t format_map;
@@ -1202,9 +1199,9 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
 	} while (0)
 
 static void intel_sdvo_update_props(struct intel_sdvo *intel_sdvo,
-				    struct intel_sdvo_connector_state *sdvo_state)
+				    const struct intel_sdvo_connector_state *sdvo_state)
 {
-	struct drm_connector_state *conn_state = &sdvo_state->base.base;
+	const struct drm_connector_state *conn_state = &sdvo_state->base.base;
 	struct intel_sdvo_connector *intel_sdvo_conn =
 		to_intel_sdvo_connector(conn_state->connector);
 	uint16_t val;
@@ -1258,14 +1255,15 @@ static void intel_sdvo_update_props(struct intel_sdvo *intel_sdvo,
 }
 
 static void intel_sdvo_pre_enable(struct intel_encoder *intel_encoder,
-				  struct intel_crtc_state *crtc_state,
-				  struct drm_connector_state *conn_state)
+				  const struct intel_crtc_state *crtc_state,
+				  const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
 	const struct drm_display_mode *adjusted_mode = &crtc_state->base.adjusted_mode;
-	struct intel_sdvo_connector_state *sdvo_state = to_intel_sdvo_connector_state(conn_state);
-	struct drm_display_mode *mode = &crtc_state->base.mode;
+	const struct intel_sdvo_connector_state *sdvo_state =
+		to_intel_sdvo_connector_state(conn_state);
+	const struct drm_display_mode *mode = &crtc_state->base.mode;
 	struct intel_sdvo *intel_sdvo = to_sdvo(intel_encoder);
 	u32 sdvox;
 	struct intel_sdvo_in_out_map in_out;
@@ -1507,8 +1505,8 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
 }
 
 static void intel_disable_sdvo(struct intel_encoder *encoder,
-			       struct intel_crtc_state *old_crtc_state,
-			       struct drm_connector_state *conn_state)
+			       const struct intel_crtc_state *old_crtc_state,
+			       const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
@@ -1552,21 +1550,21 @@ static void intel_disable_sdvo(struct intel_encoder *encoder,
 }
 
 static void pch_disable_sdvo(struct intel_encoder *encoder,
-			     struct intel_crtc_state *old_crtc_state,
-			     struct drm_connector_state *old_conn_state)
+			     const struct intel_crtc_state *old_crtc_state,
+			     const struct drm_connector_state *old_conn_state)
 {
 }
 
 static void pch_post_disable_sdvo(struct intel_encoder *encoder,
-				  struct intel_crtc_state *old_crtc_state,
-				  struct drm_connector_state *old_conn_state)
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
 {
 	intel_disable_sdvo(encoder, old_crtc_state, old_conn_state);
 }
 
 static void intel_enable_sdvo(struct intel_encoder *encoder,
-			      struct intel_crtc_state *pipe_config,
-			      struct drm_connector_state *conn_state)
+			      const struct intel_crtc_state *pipe_config,
+			      const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 906893c006d8b48f7c4df38fc55a2dd358b084f3..0cc999fa09c5636904e58579313a05b9a162f3e5 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -814,8 +814,8 @@ intel_tv_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe)
 
 static void
 intel_enable_tv(struct intel_encoder *encoder,
-		struct intel_crtc_state *pipe_config,
-		struct drm_connector_state *conn_state)
+		const struct intel_crtc_state *pipe_config,
+		const struct drm_connector_state *conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -829,8 +829,8 @@ intel_enable_tv(struct intel_encoder *encoder,
 
 static void
 intel_disable_tv(struct intel_encoder *encoder,
-		 struct intel_crtc_state *old_crtc_state,
-		 struct drm_connector_state *old_conn_state)
+		 const struct intel_crtc_state *old_crtc_state,
+		 const struct drm_connector_state *old_conn_state)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -838,7 +838,7 @@ intel_disable_tv(struct intel_encoder *encoder,
 	I915_WRITE(TV_CTL, I915_READ(TV_CTL) & ~TV_ENC_ENABLE);
 }
 
-static const struct tv_mode *intel_tv_mode_find(struct drm_connector_state *conn_state)
+static const struct tv_mode *intel_tv_mode_find(const struct drm_connector_state *conn_state)
 {
 	int format = conn_state->tv.mode;
 
@@ -976,8 +976,8 @@ static void set_color_conversion(struct drm_i915_private *dev_priv,
 }
 
 static void intel_tv_pre_enable(struct intel_encoder *encoder,
-				struct intel_crtc_state *pipe_config,
-				struct drm_connector_state *conn_state)
+				const struct intel_crtc_state *pipe_config,
+				const struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);