drm/i915: Constify adjusted_mode

Make adjusted_mode const whereever we don't have to modify it. This only
covers cases when we have a local adjusted_mode variable, and doesn't
make any difference for cases where we just dereference
pipe_config->adjusted_mode.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

19 files changed, 44 insertions, 53 deletions

diff --git a/drivers/gpu/drm/i915/dvo.h b/drivers/gpu/drm/i915/dvo.h
index 312163379db9..0e2c1b9648a7 100644
--- a/drivers/gpu/drm/i915/dvo.h
+++ b/drivers/gpu/drm/i915/dvo.h
@@ -94,8 +94,8 @@ struct intel_dvo_dev_ops {
 	 * after this function is called.
 	 */
 	void (*mode_set)(struct intel_dvo_device *dvo,
-			 struct drm_display_mode *mode,
-			 struct drm_display_mode *adjusted_mode);
+			 const struct drm_display_mode *mode,
+			 const struct drm_display_mode *adjusted_mode);
 
 	/*
 	 * Probe for a connected output, and return detect_status.
diff --git a/drivers/gpu/drm/i915/dvo_ch7017.c b/drivers/gpu/drm/i915/dvo_ch7017.c
index 86b27d1d90c2..cbb22027a3ce 100644
--- a/drivers/gpu/drm/i915/dvo_ch7017.c
+++ b/drivers/gpu/drm/i915/dvo_ch7017.c
@@ -255,8 +255,8 @@ static enum drm_mode_status ch7017_mode_valid(struct intel_dvo_device *dvo,
 }
 
 static void ch7017_mode_set(struct intel_dvo_device *dvo,
-			    struct drm_display_mode *mode,
-			    struct drm_display_mode *adjusted_mode)
+			    const struct drm_display_mode *mode,
+			    const struct drm_display_mode *adjusted_mode)
 {
 	uint8_t lvds_pll_feedback_div, lvds_pll_vco_control;
 	uint8_t outputs_enable, lvds_control_2, lvds_power_down;
diff --git a/drivers/gpu/drm/i915/dvo_ch7xxx.c b/drivers/gpu/drm/i915/dvo_ch7xxx.c
index 80449f475960..4b4acc1a06fe 100644
--- a/drivers/gpu/drm/i915/dvo_ch7xxx.c
+++ b/drivers/gpu/drm/i915/dvo_ch7xxx.c
@@ -275,8 +275,8 @@ static enum drm_mode_status ch7xxx_mode_valid(struct intel_dvo_device *dvo,
 }
 
 static void ch7xxx_mode_set(struct intel_dvo_device *dvo,
-			    struct drm_display_mode *mode,
-			    struct drm_display_mode *adjusted_mode)
+			    const struct drm_display_mode *mode,
+			    const struct drm_display_mode *adjusted_mode)
 {
 	uint8_t tvco, tpcp, tpd, tlpf, idf;
 
diff --git a/drivers/gpu/drm/i915/dvo_ivch.c b/drivers/gpu/drm/i915/dvo_ivch.c
index e082f75317a0..ff9f1b077d83 100644
--- a/drivers/gpu/drm/i915/dvo_ivch.c
+++ b/drivers/gpu/drm/i915/dvo_ivch.c
@@ -394,8 +394,8 @@ static bool ivch_get_hw_state(struct intel_dvo_device *dvo)
 }
 
 static void ivch_mode_set(struct intel_dvo_device *dvo,
-			  struct drm_display_mode *mode,
-			  struct drm_display_mode *adjusted_mode)
+			  const struct drm_display_mode *mode,
+			  const struct drm_display_mode *adjusted_mode)
 {
 	struct ivch_priv *priv = dvo->dev_priv;
 	uint16_t vr40 = 0;
diff --git a/drivers/gpu/drm/i915/dvo_ns2501.c b/drivers/gpu/drm/i915/dvo_ns2501.c
index 97ae8aa157e9..063859fff0f0 100644
--- a/drivers/gpu/drm/i915/dvo_ns2501.c
+++ b/drivers/gpu/drm/i915/dvo_ns2501.c
@@ -546,8 +546,8 @@ static enum drm_mode_status ns2501_mode_valid(struct intel_dvo_device *dvo,
 }
 
 static void ns2501_mode_set(struct intel_dvo_device *dvo,
-			    struct drm_display_mode *mode,
-			    struct drm_display_mode *adjusted_mode)
+			    const struct drm_display_mode *mode,
+			    const struct drm_display_mode *adjusted_mode)
 {
 	const struct ns2501_configuration *conf;
 	struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
diff --git a/drivers/gpu/drm/i915/dvo_sil164.c b/drivers/gpu/drm/i915/dvo_sil164.c
index fa0114967076..26f13eb634f9 100644
--- a/drivers/gpu/drm/i915/dvo_sil164.c
+++ b/drivers/gpu/drm/i915/dvo_sil164.c
@@ -190,8 +190,8 @@ static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
 }
 
 static void sil164_mode_set(struct intel_dvo_device *dvo,
-			    struct drm_display_mode *mode,
-			    struct drm_display_mode *adjusted_mode)
+			    const struct drm_display_mode *mode,
+			    const struct drm_display_mode *adjusted_mode)
 {
 	/* As long as the basics are set up, since we don't have clock
 	 * dependencies in the mode setup, we can just leave the
diff --git a/drivers/gpu/drm/i915/dvo_tfp410.c b/drivers/gpu/drm/i915/dvo_tfp410.c
index 7853719a0e81..6f1a0a6d4e22 100644
--- a/drivers/gpu/drm/i915/dvo_tfp410.c
+++ b/drivers/gpu/drm/i915/dvo_tfp410.c
@@ -222,8 +222,8 @@ static enum drm_mode_status tfp410_mode_valid(struct intel_dvo_device *dvo,
 }
 
 static void tfp410_mode_set(struct intel_dvo_device *dvo,
-			    struct drm_display_mode *mode,
-			    struct drm_display_mode *adjusted_mode)
+			    const struct drm_display_mode *mode,
+			    const struct drm_display_mode *adjusted_mode)
 {
 	/* As long as the basics are set up, since we don't have clock dependencies
 	* in the mode setup, we can just leave the registers alone and everything
diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index e4c30e8c2674..b08b4a7fae49 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -397,7 +397,7 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
-	struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 	struct drm_connector *connector;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 6ce38e3edf21..cac7928ebc49 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -158,7 +158,7 @@ static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crt *crt = intel_encoder_to_crt(encoder);
 	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 	u32 adpa;
 
 	if (INTEL_INFO(dev)->gen >= 5)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5105e09b65cc..47bf13ff5e24 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4392,7 +4392,7 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
 int skl_update_scaler_crtc(struct intel_crtc_state *state)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(state->base.crtc);
-	struct drm_display_mode *adjusted_mode = &state->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &state->base.adjusted_mode;
 
 	DRM_DEBUG_KMS("Updating scaler for [CRTC:%i] scaler_user index %u.%u\n",
 		      intel_crtc->base.base.id, intel_crtc->pipe, SKL_CRTC_INDEX);
@@ -6477,7 +6477,7 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
 				       struct intel_crtc_state *pipe_config)
 {
 	struct drm_device *dev = intel_crtc->base.dev;
-	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	int lane, link_bw, fdi_dotclock, ret;
 	bool needs_recompute = false;
 
@@ -6556,7 +6556,7 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 
 	/* FIXME should check pixel clock limits on all platforms */
 	if (INTEL_INFO(dev)->gen < 4) {
@@ -7624,7 +7624,7 @@ static void intel_set_pipe_timings(struct intel_crtc *intel_crtc)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	enum pipe pipe = intel_crtc->pipe;
 	enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
-	struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
 	uint32_t crtc_vtotal, crtc_vblank_end;
 	int vsyncshift = 0;
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 06a2b1046daf..77f733007e32 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1587,7 +1587,7 @@ static void intel_dp_prepare(struct intel_encoder *encoder)
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	enum port port = dp_to_dig_port(intel_dp)->port;
 	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 
 	intel_dp_set_link_params(intel_dp, crtc->config);
 
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index cccf014d55c1..ca4d0220ecd4 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -40,7 +40,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	struct drm_atomic_state *state;
 	int bpp, i;
 	int lane_count, slots;
-	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	struct drm_connector *drm_connector;
 	struct intel_connector *connector, *found = NULL;
 	struct drm_connector_state *connector_state;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c96289dba380..c98ed81c3a2e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -683,7 +683,7 @@ struct intel_hdmi {
 				const void *frame, ssize_t len);
 	void (*set_infoframes)(struct drm_encoder *encoder,
 			       bool enable,
-			       struct drm_display_mode *adjusted_mode);
+			       const struct drm_display_mode *adjusted_mode);
 	bool (*infoframe_enabled)(struct drm_encoder *encoder);
 };
 
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 4fb97c07bbc2..eb86ba7faaac 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -774,7 +774,7 @@ static void intel_dsi_prepare(struct intel_encoder *intel_encoder)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
-	struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
 	enum port port;
 	unsigned int bpp = intel_crtc->config->pipe_bpp;
 	u32 val, tmp;
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 555afbcb6043..8492053e0ff0 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -251,7 +251,7 @@ static void intel_dvo_pre_enable(struct intel_encoder *encoder)
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 	struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 	int pipe = crtc->pipe;
 	u32 dvo_val;
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 08f8399f8418..af231ede4776 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -447,7 +447,7 @@ static void intel_write_infoframe(struct drm_encoder *encoder,
 }
 
 static void intel_hdmi_set_avi_infoframe(struct drm_encoder *encoder,
-					 struct drm_display_mode *adjusted_mode)
+					 const struct drm_display_mode *adjusted_mode)
 {
 	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -491,7 +491,7 @@ static void intel_hdmi_set_spd_infoframe(struct drm_encoder *encoder)
 
 static void
 intel_hdmi_set_hdmi_infoframe(struct drm_encoder *encoder,
-			      struct drm_display_mode *adjusted_mode)
+			      const struct drm_display_mode *adjusted_mode)
 {
 	union hdmi_infoframe frame;
 	int ret;
@@ -506,7 +506,7 @@ intel_hdmi_set_hdmi_infoframe(struct drm_encoder *encoder,
 
 static void g4x_set_infoframes(struct drm_encoder *encoder,
 			       bool enable,
-			       struct drm_display_mode *adjusted_mode)
+			       const struct drm_display_mode *adjusted_mode)
 {
 	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
@@ -658,7 +658,7 @@ static bool intel_hdmi_set_gcp_infoframe(struct drm_encoder *encoder)
 
 static void ibx_set_infoframes(struct drm_encoder *encoder,
 			       bool enable,
-			       struct drm_display_mode *adjusted_mode)
+			       const struct drm_display_mode *adjusted_mode)
 {
 	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -710,7 +710,7 @@ static void ibx_set_infoframes(struct drm_encoder *encoder,
 
 static void cpt_set_infoframes(struct drm_encoder *encoder,
 			       bool enable,
-			       struct drm_display_mode *adjusted_mode)
+			       const struct drm_display_mode *adjusted_mode)
 {
 	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -752,7 +752,7 @@ static void cpt_set_infoframes(struct drm_encoder *encoder,
 
 static void vlv_set_infoframes(struct drm_encoder *encoder,
 			       bool enable,
-			       struct drm_display_mode *adjusted_mode)
+			       const struct drm_display_mode *adjusted_mode)
 {
 	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
@@ -804,7 +804,7 @@ static void vlv_set_infoframes(struct drm_encoder *encoder,
 
 static void hsw_set_infoframes(struct drm_encoder *encoder,
 			       bool enable,
-			       struct drm_display_mode *adjusted_mode)
+			       const struct drm_display_mode *adjusted_mode)
 {
 	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
@@ -841,7 +841,7 @@ static void intel_hdmi_prepare(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
-	struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 	u32 hdmi_val;
 
 	hdmi_val = SDVO_ENCODING_HDMI;
@@ -1537,7 +1537,7 @@ static void intel_hdmi_pre_enable(struct intel_encoder *encoder)
 {
 	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
 
 	intel_hdmi_prepare(encoder);
 
@@ -1554,7 +1554,7 @@ static void vlv_hdmi_pre_enable(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc =
 		to_intel_crtc(encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
 	enum dpio_channel port = vlv_dport_to_channel(dport);
 	int pipe = intel_crtc->pipe;
 	u32 val;
@@ -1820,7 +1820,7 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc =
 		to_intel_crtc(encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
 	enum dpio_channel ch = vlv_dport_to_channel(dport);
 	int pipe = intel_crtc->pipe;
 	int data, i, stagger;
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 2806049e3a62..dd71e7f139e3 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -105,12 +105,8 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 			struct intel_crtc_state *pipe_config,
 			int fitting_mode)
 {
-	struct drm_display_mode *adjusted_mode;
-	int x, y, width, height;
-
-	adjusted_mode = &pipe_config->base.adjusted_mode;
-
-	x = y = width = height = 0;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+	int x = 0, y = 0, width = 0, height = 0;
 
 	/* Native modes don't need fitting */
 	if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
@@ -230,7 +226,7 @@ static inline u32 panel_fitter_scaling(u32 source, u32 target)
 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 			      u32 *pfit_control)
 {
-	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 	u32 scaled_width = adjusted_mode->crtc_hdisplay *
 		pipe_config->pipe_src_h;
 	u32 scaled_height = pipe_config->pipe_src_w *
@@ -310,9 +306,7 @@ void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 {
 	struct drm_device *dev = intel_crtc->base.dev;
 	u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
-	struct drm_display_mode *adjusted_mode;
-
-	adjusted_mode = &pipe_config->base.adjusted_mode;
+	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 
 	/* Native modes don't need fitting */
 	if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d5c60bbb9c4c..7da3358405d4 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -703,12 +703,9 @@ static void pineview_update_wm(struct drm_crtc *unused_crtc)
 
 	crtc = single_enabled_crtc(dev);
 	if (crtc) {
-		const struct drm_display_mode *adjusted_mode;
+		const struct drm_display_mode *adjusted_mode = &to_intel_crtc(crtc)->config->base.adjusted_mode;
 		int pixel_size = crtc->primary->state->fb->bits_per_pixel / 8;
-		int clock;
-
-		adjusted_mode = &to_intel_crtc(crtc)->config->base.adjusted_mode;
-		clock = adjusted_mode->crtc_clock;
+		int clock = adjusted_mode->crtc_clock;
 
 		/* Display SR */
 		wm = intel_calculate_wm(clock, &pineview_display_wm,
@@ -2086,7 +2083,7 @@ hsw_compute_linetime_wm(struct drm_device *dev, struct drm_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
 	u32 linetime, ips_linetime;
 
 	if (!intel_crtc->active)
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 9df6bbd1872c..857b1bd71156 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1189,7 +1189,7 @@ static void intel_sdvo_pre_enable(struct intel_encoder *intel_encoder)
 	struct drm_device *dev = intel_encoder->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *crtc = to_intel_crtc(intel_encoder->base.crtc);
-	struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
+	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 	struct drm_display_mode *mode = &crtc->config->base.mode;
 	struct intel_sdvo *intel_sdvo = to_sdvo(intel_encoder);
 	u32 sdvox;