drm/omap: Make the video_mode pointer to .set_timings() const

The .set_timings() operations of the omap_dss_device instances don't
need to modify the passed timings. Make the pointer const.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/dpi.c

@@ -479,7 +479,7 @@ static void dpi_display_disable(struct omap_dss_device *dssdev)
 }
 
 static void dpi_set_timings(struct omap_dss_device *dssdev,
-			    struct videomode *vm)
+			    const struct videomode *vm)
 {
 	struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -263,7 +263,7 @@ static int hdmi_display_check_timings(struct omap_dss_device *dssdev,
 }
 
 static void hdmi_display_set_timings(struct omap_dss_device *dssdev,
-				     struct videomode *vm)
+				     const struct videomode *vm)
 {
 	struct omap_hdmi *hdmi = dssdev_to_hdmi(dssdev);
 

drivers/gpu/drm/omapdrm/dss/hdmi5.c

@@ -262,7 +262,7 @@ static int hdmi_display_check_timings(struct omap_dss_device *dssdev,
 }
 
 static void hdmi_display_set_timings(struct omap_dss_device *dssdev,
-				     struct videomode *vm)
+				     const struct videomode *vm)
 {
 	struct omap_hdmi *hdmi = dssdev_to_hdmi(dssdev);
 

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -368,7 +368,7 @@ struct omap_dss_device_ops {
 	void (*get_timings)(struct omap_dss_device *dssdev,
 			    struct videomode *vm);
 	void (*set_timings)(struct omap_dss_device *dssdev,
-			    struct videomode *vm);
+			    const struct videomode *vm);
 
 	bool (*detect)(struct omap_dss_device *dssdev);
 

drivers/gpu/drm/omapdrm/dss/sdi.c

@@ -230,7 +230,7 @@ static void sdi_display_disable(struct omap_dss_device *dssdev)
 }
 
 static void sdi_set_timings(struct omap_dss_device *dssdev,
-			    struct videomode *vm)
+			    const struct videomode *vm)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
 

drivers/gpu/drm/omapdrm/dss/venc.c

@@ -569,7 +569,7 @@ static void venc_display_disable(struct omap_dss_device *dssdev)
 }
 
 static void venc_set_timings(struct omap_dss_device *dssdev,
-			     struct videomode *vm)
+			     const struct videomode *vm)
 {
 	struct venc_device *venc = dssdev_to_venc(dssdev);
 	struct videomode actual_vm;