drm/i915: Refactor non-EDID fixed mode duplication

All the non-EDID fixed mode functions basically do the exact
same thing. Let's refactor the common bits into a shared
function.

There are minor differences on how the mode types are populated,
whether the display info physical size is updated, and the debug
print. The differences are purely accidental, so unifying them is
actually a good thing.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220331112822.11462-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -243,68 +243,62 @@ void intel_panel_add_edid_fixed_mode(struct intel_connector *connector)
 	list_add_tail(&fixed_mode->head, &connector->panel.fixed_modes);
 }
 
-void intel_panel_add_vbt_lfp_fixed_mode(struct intel_connector *connector)
+static void intel_panel_add_fixed_mode(struct intel_connector *connector,
+				       struct drm_display_mode *fixed_mode,
+				       const char *type)
 {
-	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 	struct drm_display_info *info = &connector->base.display_info;
-	struct drm_display_mode *fixed_mode;
 
-	if (!dev_priv->vbt.lfp_lvds_vbt_mode)
-		return;
-
-	fixed_mode = drm_mode_duplicate(&dev_priv->drm,
-					dev_priv->vbt.lfp_lvds_vbt_mode);
 	if (!fixed_mode)
 		return;
 
-	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
-
-	drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] using mode from VBT: " DRM_MODE_FMT "\n",
-		    connector->base.base.id, connector->base.name,
-		    DRM_MODE_ARG(fixed_mode));
+	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
 
 	info->width_mm = fixed_mode->width_mm;
 	info->height_mm = fixed_mode->height_mm;
 
+	drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] using %s fixed mode: " DRM_MODE_FMT "\n",
+		    connector->base.base.id, connector->base.name, type,
+		    DRM_MODE_ARG(fixed_mode));
+
 	list_add_tail(&fixed_mode->head, &connector->panel.fixed_modes);
 }
 
-void intel_panel_add_vbt_sdvo_fixed_mode(struct intel_connector *connector)
+void intel_panel_add_vbt_lfp_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;
+	const struct drm_display_mode *mode;
 
-	fixed_mode = drm_mode_duplicate(&i915->drm,
-					i915->vbt.sdvo_lvds_vbt_mode);
-	if (!fixed_mode)
+	mode = i915->vbt.lfp_lvds_vbt_mode;
+	if (!mode)
 		return;
 
-	/* Guarantee the mode is preferred */
-	fixed_mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
-
-	list_add_tail(&fixed_mode->head, &connector->panel.fixed_modes);
+	intel_panel_add_fixed_mode(connector,
+				   drm_mode_duplicate(&i915->drm, mode),
+				   "VBT LFP");
 }
 
-void intel_panel_add_encoder_fixed_mode(struct intel_connector *connector,
-					struct intel_encoder *encoder)
+void intel_panel_add_vbt_sdvo_fixed_mode(struct intel_connector *connector)
 {
 	struct drm_i915_private *i915 = to_i915(connector->base.dev);
-	struct drm_display_mode *fixed_mode;
+	const struct drm_display_mode *mode;
 
-	fixed_mode = intel_encoder_current_mode(encoder);
-	if (!fixed_mode)
+	mode = i915->vbt.sdvo_lvds_vbt_mode;
+	if (!mode)
 		return;
 
-	drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] using current (BIOS) mode: " DRM_MODE_FMT "\n",
-		    connector->base.base.id, connector->base.name,
-		    DRM_MODE_ARG(fixed_mode));
-
-	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
+	intel_panel_add_fixed_mode(connector,
+				   drm_mode_duplicate(&i915->drm, mode),
+				   "VBT SDVO");
+}
 
-	list_add_tail(&fixed_mode->head, &connector->panel.fixed_modes);
+void intel_panel_add_encoder_fixed_mode(struct intel_connector *connector,
+					struct intel_encoder *encoder)
+{
+	intel_panel_add_fixed_mode(connector,
+				   intel_encoder_current_mode(encoder),
+				   "current (BIOS)");
 }
 
 /* adjusted_mode has been preset to be the panel's fixed mode */