drm/i915: Extract intel_panel_vbt_sdvo_fixed_mode()

We have a function for duplicating the VBT LFP mode. Add the same
for the VBT SDVO mode.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220323182935.4701-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -272,6 +272,26 @@ intel_panel_vbt_lfp_fixed_mode(struct intel_connector *connector)
 	return fixed_mode;
 }
 
+struct drm_display_mode *
+intel_panel_vbt_sdvo_fixed_mode(struct intel_connector *connector)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	struct drm_display_mode *fixed_mode;
+
+	if (!i915->vbt.sdvo_lvds_vbt_mode)
+		return NULL;
+
+	fixed_mode = drm_mode_duplicate(&i915->drm,
+					i915->vbt.sdvo_lvds_vbt_mode);
+	if (!fixed_mode)
+		return NULL;
+
+	/* Guarantee the mode is preferred */
+	fixed_mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
+
+	return fixed_mode;
+}
+
 /* adjusted_mode has been preset to be the panel's fixed mode */
 static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 			     const struct drm_connector_state *conn_state)

drivers/gpu/drm/i915/display/intel_panel.h

@@ -48,5 +48,7 @@ struct drm_display_mode *
 intel_panel_edid_fixed_mode(struct intel_connector *connector);
 struct drm_display_mode *
 intel_panel_vbt_lfp_fixed_mode(struct intel_connector *connector);
+struct drm_display_mode *
+intel_panel_vbt_sdvo_fixed_mode(struct intel_connector *connector);
 
 #endif /* __INTEL_PANEL_H__ */

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

@@ -2301,17 +2301,11 @@ static int intel_sdvo_get_lvds_modes(struct drm_connector *connector)
 	 * Fetch modes from VBT. For SDVO prefer the VBT mode since some
 	 * SDVO->LVDS transcoders can't cope with the EDID mode.
 	 */
-	if (dev_priv->vbt.sdvo_lvds_vbt_mode != NULL) {
-		newmode = drm_mode_duplicate(connector->dev,
-					     dev_priv->vbt.sdvo_lvds_vbt_mode);
-		if (newmode != NULL) {
-			/* Guarantee the mode is preferred */
-			newmode->type = (DRM_MODE_TYPE_PREFERRED |
-					 DRM_MODE_TYPE_DRIVER);
+	newmode = intel_panel_vbt_sdvo_fixed_mode(to_intel_connector(connector));
+	if (newmode) {
 		drm_mode_probed_add(connector, newmode);
 		num_modes++;
 	}
-	}
 
 	/*
 	 * Attempt to get the mode list from DDC.