drm/i915/lvds: Pass fixed_mode to compute_is_dual_link_lvds()

We want to eventually get rid of the connector->panel.fixed_mode
pointer so avoid using it during LVDS setup. Since this all
happens during the encoder init we already have the fixed_mode
around, just pass that in.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220311172428.14685-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_lvds.c

@@ -784,7 +784,8 @@ bool intel_is_dual_link_lvds(struct drm_i915_private *dev_priv)
 	return encoder && to_lvds_encoder(&encoder->base)->is_dual_link;
 }
 
-static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
+static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder,
+				      const struct drm_display_mode *fixed_mode)
 {
 	struct drm_device *dev = lvds_encoder->base.base.dev;
 	unsigned int val;
@@ -795,7 +796,7 @@ static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 		return dev_priv->params.lvds_channel_mode == 2;
 
 	/* single channel LVDS is limited to 112 MHz */
-	if (lvds_encoder->attached_connector->panel.fixed_mode->clock > 112999)
+	if (fixed_mode->clock > 112999)
 		return true;
 
 	if (dmi_check_system(intel_dual_link_lvds))
@@ -1004,7 +1005,7 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
 	intel_backlight_setup(intel_connector, INVALID_PIPE);
 
-	lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
+	lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder, fixed_mode);
 	drm_dbg_kms(&dev_priv->drm, "detected %s-link lvds configuration\n",
 		    lvds_encoder->is_dual_link ? "dual" : "single");