drm/i915: Introduce intel_panel_get_modes()

Several connectors want to return the fixed_mode from .get_modes(),
add a helper to do that (and hide the details inside intel_panel.c).
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220311172428.14685-8-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -4588,17 +4588,8 @@ static int intel_dp_get_modes(struct drm_connector *connector)
 	}
 
 	/* Also add fixed mode, which may or may not be present in EDID */
-	if (intel_dp_is_edp(intel_attached_dp(intel_connector)) &&
-	    intel_connector->panel.fixed_mode) {
-		struct drm_display_mode *mode;
-
-		mode = drm_mode_duplicate(connector->dev,
-					  intel_connector->panel.fixed_mode);
-		if (mode) {
-			drm_mode_probed_add(connector, mode);
-			num_modes++;
-		}
-	}
+	if (intel_dp_is_edp(intel_attached_dp(intel_connector)))
+		num_modes += intel_panel_get_modes(intel_connector);
 
 	if (num_modes)
 		return num_modes;

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

@@ -34,26 +34,7 @@ int intel_dsi_tlpx_ns(const struct intel_dsi *intel_dsi)
 
 int intel_dsi_get_modes(struct drm_connector *connector)
 {
-	struct drm_i915_private *i915 = to_i915(connector->dev);
-	struct intel_connector *intel_connector = to_intel_connector(connector);
-	struct drm_display_mode *mode;
-
-	drm_dbg_kms(&i915->drm, "\n");
-
-	if (!intel_connector->panel.fixed_mode) {
-		drm_dbg_kms(&i915->drm, "no fixed mode\n");
-		return 0;
-	}
-
-	mode = drm_mode_duplicate(connector->dev,
-				  intel_connector->panel.fixed_mode);
-	if (!mode) {
-		drm_dbg_kms(&i915->drm, "drm_mode_duplicate failed\n");
-		return 0;
-	}
-
-	drm_mode_probed_add(connector, mode);
-	return 1;
+	return intel_panel_get_modes(to_intel_connector(connector));
 }
 
 enum drm_mode_status intel_dsi_mode_valid(struct drm_connector *connector,

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

@@ -333,8 +333,6 @@ intel_dvo_detect(struct drm_connector *connector, bool force)
 static int intel_dvo_get_modes(struct drm_connector *connector)
 {
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
-	const struct drm_display_mode *fixed_mode =
-		to_intel_connector(connector)->panel.fixed_mode;
 	int num_modes;
 
 	/*
@@ -348,17 +346,7 @@ static int intel_dvo_get_modes(struct drm_connector *connector)
 	if (num_modes)
 		return num_modes;
 
-	if (fixed_mode) {
-		struct drm_display_mode *mode;
-
-		mode = drm_mode_duplicate(connector->dev, fixed_mode);
-		if (mode) {
-			drm_mode_probed_add(connector, mode);
-			num_modes++;
-		}
-	}
-
-	return num_modes;
+	return intel_panel_get_modes(to_intel_connector(connector));
 }
 
 static const struct drm_connector_funcs intel_dvo_connector_funcs = {

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

@@ -476,19 +476,12 @@ static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 static int intel_lvds_get_modes(struct drm_connector *connector)
 {
 	struct intel_connector *intel_connector = to_intel_connector(connector);
-	struct drm_device *dev = connector->dev;
-	struct drm_display_mode *mode;
 
 	/* use cached edid if we have one */
 	if (!IS_ERR_OR_NULL(intel_connector->edid))
 		return drm_add_edid_modes(connector, intel_connector->edid);
 
-	mode = drm_mode_duplicate(dev, intel_connector->panel.fixed_mode);
-	if (mode == NULL)
-		return 0;
-
-	drm_mode_probed_add(connector, mode);
-	return 1;
+	return intel_panel_get_modes(intel_connector);
 }
 
 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {

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

@@ -59,6 +59,24 @@ intel_panel_downclock_mode(struct intel_connector *connector,
 	return connector->panel.downclock_mode;
 }
 
+int intel_panel_get_modes(struct intel_connector *connector)
+{
+	int num_modes = 0;
+
+	if (connector->panel.fixed_mode) {
+		struct drm_display_mode *mode;
+
+		mode = drm_mode_duplicate(connector->base.dev,
+					  connector->panel.fixed_mode);
+		if (mode) {
+			drm_mode_probed_add(&connector->base, mode);
+			num_modes++;
+		}
+	}
+
+	return num_modes;
+}
+
 int intel_panel_compute_config(struct intel_connector *connector,
 			       struct drm_display_mode *adjusted_mode)
 {

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

@@ -30,6 +30,7 @@ intel_panel_fixed_mode(struct intel_connector *connector,
 const struct drm_display_mode *
 intel_panel_downclock_mode(struct intel_connector *connector,
 			   const struct drm_display_mode *adjusted_mode);
+int intel_panel_get_modes(struct intel_connector *connector);
 enum drm_mode_status
 intel_panel_mode_valid(struct intel_connector *connector,
 		       const struct drm_display_mode *mode);