drm/i915: Refactor EDID fixed mode search

Both LVDS and eDP have the same code to look up the preferred mode
from the connector probed_modes list. Move the code to a common
location.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190321132446.22394-1-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_dp.c

@@ -7057,7 +7057,6 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	struct drm_display_mode *fixed_mode = NULL;
 	struct drm_display_mode *downclock_mode = NULL;
 	bool has_dpcd;
-	struct drm_display_mode *scan;
 	enum pipe pipe = INVALID_PIPE;
 	intel_wakeref_t wakeref;
 	struct edid *edid;
@@ -7110,15 +7109,9 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	}
 	intel_connector->edid = edid;
 
-	/* prefer fixed mode from EDID if available */
-	list_for_each_entry(scan, &connector->probed_modes, head) {
-		if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
-			fixed_mode = drm_mode_duplicate(dev, scan);
-			downclock_mode = intel_dp_drrs_init(
-						intel_connector, fixed_mode);
-			break;
-		}
-	}
+	fixed_mode = intel_panel_edid_fixed_mode(intel_connector);
+	if (fixed_mode)
+		downclock_mode = intel_dp_drrs_init(intel_connector, fixed_mode);
 
 	/* fallback to VBT if available for eDP */
 	if (!fixed_mode && dev_priv->vbt.lfp_lvds_vbt_mode) {

drivers/gpu/drm/i915/intel_drv.h

@@ -2157,6 +2157,8 @@ extern struct drm_display_mode *intel_find_panel_downclock(
 				struct drm_i915_private *dev_priv,
 				struct drm_display_mode *fixed_mode,
 				struct drm_connector *connector);
+struct drm_display_mode *
+intel_panel_edid_fixed_mode(struct intel_connector *connector);
 
 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 int intel_backlight_device_register(struct intel_connector *connector);

drivers/gpu/drm/i915/intel_lvds.c

@@ -810,7 +810,6 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	struct intel_connector *intel_connector;
 	struct drm_connector *connector;
 	struct drm_encoder *encoder;
-	struct drm_display_mode *scan; /* *modes, *bios_mode; */
 	struct drm_display_mode *fixed_mode = NULL;
 	struct drm_display_mode *downclock_mode = NULL;
 	struct edid *edid;
@@ -949,16 +948,9 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	}
 	intel_connector->edid = edid;
 
-	list_for_each_entry(scan, &connector->probed_modes, head) {
-		if (scan->type & DRM_MODE_TYPE_PREFERRED) {
-			DRM_DEBUG_KMS("using preferred mode from EDID: ");
-			drm_mode_debug_printmodeline(scan);
-
-			fixed_mode = drm_mode_duplicate(dev, scan);
+	fixed_mode = intel_panel_edid_fixed_mode(intel_connector);
 	if (fixed_mode)
 		goto out;
-		}
-	}
 
 	/* Failed to get EDID, what about VBT? */
 	if (dev_priv->vbt.lfp_lvds_vbt_mode) {

drivers/gpu/drm/i915/intel_panel.c

@@ -99,6 +99,33 @@ intel_find_panel_downclock(struct drm_i915_private *dev_priv,
 		return NULL;
 }
 
+struct drm_display_mode *
+intel_panel_edid_fixed_mode(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	const struct drm_display_mode *scan;
+
+	/* prefer fixed mode from EDID if available */
+	list_for_each_entry(scan, &connector->base.probed_modes, head) {
+		struct drm_display_mode *fixed_mode;
+
+		if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
+			continue;
+
+		fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
+		if (!fixed_mode)
+			return NULL;
+
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using preferred mode from EDID: ",
+			      connector->base.base.id, connector->base.name);
+		drm_mode_debug_printmodeline(fixed_mode);
+
+		return fixed_mode;
+	}
+
+	return NULL;
+}
+
 /* adjusted_mode has been preset to be the panel's fixed mode */
 void
 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,