drm: bridge: Constify mode arguments to bridge .mode_set() operation

The mode and ajusted_mode passed to the bridge .mode_set() operation
should never be modified by the bridge (and are not in any of the
existing bridge drivers). Make them const to make this clear.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

24 files changed, 56 insertions, 55 deletions

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h b/drivers/gpu/drm/bridge/adv7511/adv7511.h
index 73d8ccb97742..2b6e0832d1cf 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
@@ -395,7 +395,7 @@ static inline int adv7511_cec_init(struct device *dev, struct adv7511 *adv7511)
 #ifdef CONFIG_DRM_I2C_ADV7533
 void adv7533_dsi_power_on(struct adv7511 *adv);
 void adv7533_dsi_power_off(struct adv7511 *adv);
-void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode);
+void adv7533_mode_set(struct adv7511 *adv, const struct drm_display_mode *mode);
 int adv7533_patch_registers(struct adv7511 *adv);
 int adv7533_patch_cec_registers(struct adv7511 *adv);
 int adv7533_attach_dsi(struct adv7511 *adv);
@@ -411,7 +411,7 @@ static inline void adv7533_dsi_power_off(struct adv7511 *adv)
 }
 
 static inline void adv7533_mode_set(struct adv7511 *adv,
-				    struct drm_display_mode *mode)
+				    const struct drm_display_mode *mode)
 {
 }
 
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 85c2d407a52e..d0e98caa2e2a 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -676,8 +676,8 @@ static enum drm_mode_status adv7511_mode_valid(struct adv7511 *adv7511,
 }
 
 static void adv7511_mode_set(struct adv7511 *adv7511,
-			     struct drm_display_mode *mode,
-			     struct drm_display_mode *adj_mode)
+			     const struct drm_display_mode *mode,
+			     const struct drm_display_mode *adj_mode)
 {
 	unsigned int low_refresh_rate;
 	unsigned int hsync_polarity = 0;
@@ -839,8 +839,8 @@ static void adv7511_bridge_disable(struct drm_bridge *bridge)
 }
 
 static void adv7511_bridge_mode_set(struct drm_bridge *bridge,
-				    struct drm_display_mode *mode,
-				    struct drm_display_mode *adj_mode)
+				    const struct drm_display_mode *mode,
+				    const struct drm_display_mode *adj_mode)
 {
 	struct adv7511 *adv = bridge_to_adv7511(bridge);
 
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index 185b6d842166..5d5e7d9eded2 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -108,7 +108,7 @@ void adv7533_dsi_power_off(struct adv7511 *adv)
 	regmap_write(adv->regmap_cec, 0x27, 0x0b);
 }
 
-void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode)
+void adv7533_mode_set(struct adv7511 *adv, const struct drm_display_mode *mode)
 {
 	struct mipi_dsi_device *dsi = adv->dsi;
 	int lanes, ret;
diff --git a/drivers/gpu/drm/bridge/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix-anx78xx.c
index f8433c93f463..705620e9f505 100644
--- a/drivers/gpu/drm/bridge/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix-anx78xx.c
@@ -1082,8 +1082,8 @@ static void anx78xx_bridge_disable(struct drm_bridge *bridge)
 }
 
 static void anx78xx_bridge_mode_set(struct drm_bridge *bridge,
-				    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 anx78xx *anx78xx = bridge_to_anx78xx(bridge);
 	struct hdmi_avi_infoframe frame;
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 753e96129ab7..4d5b47585834 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1361,8 +1361,8 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 }
 
 static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
-					struct drm_display_mode *orig_mode,
-					struct drm_display_mode *mode)
+				const struct drm_display_mode *orig_mode,
+				const struct drm_display_mode *mode)
 {
 	struct analogix_dp_device *dp = bridge->driver_private;
 	struct drm_display_info *display_info = &dp->connector.display_info;
diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index bfa902013aa4..a0b3a568dd9c 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -232,8 +232,8 @@ static void sii902x_bridge_enable(struct drm_bridge *bridge)
 }
 
 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
-				    struct drm_display_mode *mode,
-				    struct drm_display_mode *adj)
+				    const struct drm_display_mode *mode,
+				    const struct drm_display_mode *adj)
 {
 	struct sii902x *sii902x = bridge_to_sii902x(bridge);
 	struct regmap *regmap = sii902x->regmap;
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 64c3cf027518..4fed3eda6ded 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1998,8 +1998,8 @@ dw_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
 }
 
 static void dw_hdmi_bridge_mode_set(struct drm_bridge *bridge,
-				    struct drm_display_mode *orig_mode,
-				    struct drm_display_mode *mode)
+				    const struct drm_display_mode *orig_mode,
+				    const struct drm_display_mode *mode)
 {
 	struct dw_hdmi *hdmi = bridge->driver_private;
 
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 2f4b145b73af..23a5977a3b0a 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -248,7 +248,7 @@ static inline bool dw_mipi_is_dual_mode(struct dw_mipi_dsi *dsi)
  * The controller should generate 2 frames before
  * preparing the peripheral.
  */
-static void dw_mipi_dsi_wait_for_two_frames(struct drm_display_mode *mode)
+static void dw_mipi_dsi_wait_for_two_frames(const struct drm_display_mode *mode)
 {
 	int refresh, two_frames;
 
@@ -564,7 +564,7 @@ static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
 }
 
 static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
-				   struct drm_display_mode *mode)
+				   const struct drm_display_mode *mode)
 {
 	u32 val = 0, color = 0;
 
@@ -607,7 +607,7 @@ static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
 }
 
 static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
-					    struct drm_display_mode *mode)
+					    const struct drm_display_mode *mode)
 {
 	/*
 	 * TODO dw drv improvements
@@ -642,7 +642,7 @@ static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
 
 /* Get lane byte clock cycles. */
 static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
-					   struct drm_display_mode *mode,
+					   const struct drm_display_mode *mode,
 					   u32 hcomponent)
 {
 	u32 frac, lbcc;
@@ -658,7 +658,7 @@ static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
 }
 
 static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
-					  struct drm_display_mode *mode)
+					  const struct drm_display_mode *mode)
 {
 	u32 htotal, hsa, hbp, lbcc;
 
@@ -681,7 +681,7 @@ static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
 }
 
 static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
-					       struct drm_display_mode *mode)
+					const struct drm_display_mode *mode)
 {
 	u32 vactive, vsa, vfp, vbp;
 
@@ -818,7 +818,7 @@ static unsigned int dw_mipi_dsi_get_lanes(struct dw_mipi_dsi *dsi)
 }
 
 static void dw_mipi_dsi_mode_set(struct dw_mipi_dsi *dsi,
-				struct drm_display_mode *adjusted_mode)
+				 const struct drm_display_mode *adjusted_mode)
 {
 	const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
 	void *priv_data = dsi->plat_data->priv_data;
@@ -861,8 +861,8 @@ static void dw_mipi_dsi_mode_set(struct dw_mipi_dsi *dsi,
 }
 
 static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
-					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 dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
 
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 8e28e738cb52..4df07f4cbff5 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -203,7 +203,7 @@ struct tc_data {
 	/* display edid */
 	struct edid		*edid;
 	/* current mode */
-	struct drm_display_mode	*mode;
+	const struct drm_display_mode	*mode;
 
 	u32			rev;
 	u8			assr;
@@ -648,7 +648,8 @@ err_dpcd_read:
 	return ret;
 }
 
-static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
+static int tc_set_video_mode(struct tc_data *tc,
+			     const struct drm_display_mode *mode)
 {
 	int ret;
 	int vid_sync_dly;
@@ -1113,8 +1114,8 @@ static enum drm_mode_status tc_connector_mode_valid(struct drm_connector *connec
 }
 
 static void tc_bridge_mode_set(struct drm_bridge *bridge,
-			       struct drm_display_mode *mode,
-			       struct drm_display_mode *adj)
+			       const struct drm_display_mode *mode,
+			       const struct drm_display_mode *adj)
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
 
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index ba7025041e46..138b2711d389 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -294,8 +294,8 @@ EXPORT_SYMBOL(drm_bridge_post_disable);
  * Note: the bridge passed should be the one closest to the encoder
  */
 void drm_bridge_mode_set(struct drm_bridge *bridge,
-			struct drm_display_mode *mode,
-			struct drm_display_mode *adjusted_mode)
+			 const struct drm_display_mode *mode,
+			 const struct drm_display_mode *adjusted_mode)
 {
 	if (!bridge)
 		return;
diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index 2fd299a58297..dd02e8a323ef 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -246,8 +246,8 @@ already_disabled:
 }
 
 static void mic_mode_set(struct drm_bridge *bridge,
-			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 exynos_mic *mic = bridge->driver_private;
 
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index a7c39f39793f..a6ba461749b2 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -845,7 +845,7 @@ static int tda998x_write_aif(struct tda998x_priv *priv,
 }
 
 static void
-tda998x_write_avi(struct tda998x_priv *priv, struct drm_display_mode *mode)
+tda998x_write_avi(struct tda998x_priv *priv, const struct drm_display_mode *mode)
 {
 	union hdmi_infoframe frame;
 
@@ -1339,8 +1339,8 @@ static void tda998x_bridge_disable(struct drm_bridge *bridge)
 }
 
 static void tda998x_bridge_mode_set(struct drm_bridge *bridge,
-				    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 tda998x_priv *priv = bridge_to_tda998x_priv(bridge);
 	unsigned long tmds_clock;
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 862f3ec22131..994f0d8646bf 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1370,8 +1370,8 @@ static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
 }
 
 static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
-				     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 mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 08f3fc6771b7..9c6b31c2d79f 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -168,7 +168,7 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host,
 			bool is_dual_dsi);
 int msm_dsi_host_power_off(struct mipi_dsi_host *host);
 int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
-					struct drm_display_mode *mode);
+				  const struct drm_display_mode *mode);
 struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host,
 					unsigned long *panel_flags);
 struct drm_bridge *msm_dsi_host_get_bridge(struct mipi_dsi_host *host);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 38e481d2d606..610183db1daf 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -2424,7 +2424,7 @@ unlock_ret:
 }
 
 int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
-					struct drm_display_mode *mode)
+				  const struct drm_display_mode *mode)
 {
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 80aa6344185e..bdb063b2dc4a 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -527,8 +527,8 @@ disable_phy:
 }
 
 static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
-		struct drm_display_mode *mode,
-		struct drm_display_mode *adjusted_mode)
+		const struct drm_display_mode *mode,
+		const struct drm_display_mode *adjusted_mode)
 {
 	int id = dsi_mgr_bridge_get_id(bridge);
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
diff --git a/drivers/gpu/drm/msm/edp/edp_bridge.c b/drivers/gpu/drm/msm/edp/edp_bridge.c
index 931a5c97cccf..86366ba03e60 100644
--- a/drivers/gpu/drm/msm/edp/edp_bridge.c
+++ b/drivers/gpu/drm/msm/edp/edp_bridge.c
@@ -52,8 +52,8 @@ static void edp_bridge_post_disable(struct drm_bridge *bridge)
 }
 
 static void edp_bridge_mode_set(struct drm_bridge *bridge,
-		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 drm_device *dev = bridge->dev;
 	struct drm_connector *connector;
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index 98d61c690260..b42feb80531b 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -207,8 +207,8 @@ static void msm_hdmi_bridge_post_disable(struct drm_bridge *bridge)
 }
 
 static void msm_hdmi_bridge_mode_set(struct drm_bridge *bridge,
-		 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 hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
 	struct hdmi *hdmi = hdmi_bridge->hdmi;
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 534a128a869d..c62136a1e941 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -520,8 +520,8 @@ static void rcar_lvds_get_lvds_mode(struct rcar_lvds *lvds)
 }
 
 static void rcar_lvds_mode_set(struct drm_bridge *bridge,
-			       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 rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
 
diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
index 7ee359bcee62..ef8486e5e2cd 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -467,7 +467,7 @@ static int dw_mipi_dsi_phy_init(void *priv_data)
 }
 
 static int
-dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
+dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
 			  unsigned long mode_flags, u32 lanes, u32 format,
 			  unsigned int *lane_mbps)
 {
diff --git a/drivers/gpu/drm/sti/sti_dvo.c b/drivers/gpu/drm/sti/sti_dvo.c
index b08376b7611b..6d33772f77eb 100644
--- a/drivers/gpu/drm/sti/sti_dvo.c
+++ b/drivers/gpu/drm/sti/sti_dvo.c
@@ -277,8 +277,8 @@ static void sti_dvo_pre_enable(struct drm_bridge *bridge)
 }
 
 static void sti_dvo_set_mode(struct drm_bridge *bridge,
-			     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 sti_dvo *dvo = bridge->driver_private;
 	struct sti_mixer *mixer = to_sti_mixer(dvo->encoder->crtc);
diff --git a/drivers/gpu/drm/sti/sti_hda.c b/drivers/gpu/drm/sti/sti_hda.c
index 19b9b5ed1297..a63dd5eb7081 100644
--- a/drivers/gpu/drm/sti/sti_hda.c
+++ b/drivers/gpu/drm/sti/sti_hda.c
@@ -508,8 +508,8 @@ static void sti_hda_pre_enable(struct drm_bridge *bridge)
 }
 
 static void sti_hda_set_mode(struct drm_bridge *bridge,
-		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 sti_hda *hda = bridge->driver_private;
 	u32 mode_idx;
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index ccf718404a1c..fbef4ad6c8ef 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -917,8 +917,8 @@ static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
 }
 
 static void sti_hdmi_set_mode(struct drm_bridge *bridge,
-		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 sti_hdmi *hdmi = bridge->driver_private;
 	int ret;
diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index a514b593f37c..a672b59a2226 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -215,7 +215,7 @@ static int dw_mipi_dsi_phy_init(void *priv_data)
 }
 
 static int
-dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
+dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
 			  unsigned long mode_flags, u32 lanes, u32 format,
 			  unsigned int *lane_mbps)
 {