drm/i915/opregion: convert intel_opregion_get_edid() to struct drm_edid

Simplify validation and use by converting to drm_edid.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6abb01f1e97d54a3c11bec24377f035df412b492.1674643465.git.jani.nikula@intel.com

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

@@ -5298,18 +5298,12 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	mutex_lock(&dev_priv->drm.mode_config.mutex);
 	drm_edid = drm_edid_read_ddc(connector, &intel_dp->aux.ddc);
 	if (!drm_edid) {
-		const struct edid *edid;
-
 		/* Fallback to EDID from ACPI OpRegion, if any */
-		/* FIXME: Make intel_opregion_get_edid() return drm_edid */
-		edid = intel_opregion_get_edid(intel_connector);
-		if (edid) {
-			drm_edid = drm_edid_alloc(edid, (edid->extensions + 1) * EDID_LENGTH);
+		drm_edid = intel_opregion_get_edid(intel_connector);
+		if (drm_edid)
 			drm_dbg_kms(&dev_priv->drm,
 				    "[CONNECTOR:%d:%s] Using OpRegion EDID\n",
 				    connector->base.id, connector->name);
-			kfree(edid);
-		}
 	}
 	if (drm_edid) {
 		if (drm_edid_connector_update(connector, drm_edid) ||

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

@@ -1101,41 +1101,34 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
  * The EDID in the OpRegion, or NULL if there is none or it's invalid.
  *
  */
-struct edid *intel_opregion_get_edid(struct intel_connector *intel_connector)
+const struct drm_edid *intel_opregion_get_edid(struct intel_connector *intel_connector)
 {
 	struct drm_connector *connector = &intel_connector->base;
 	struct drm_i915_private *i915 = to_i915(connector->dev);
 	struct intel_opregion *opregion = &i915->display.opregion;
-	const void *in_edid;
-	const struct edid *edid;
-	struct edid *new_edid;
+	const struct drm_edid *drm_edid;
+	const void *edid;
 	int len;
 
 	if (!opregion->asle_ext)
 		return NULL;
 
-	in_edid = opregion->asle_ext->bddc;
+	edid = opregion->asle_ext->bddc;
 
 	/* Validity corresponds to number of 128-byte blocks */
 	len = (opregion->asle_ext->phed & ASLE_PHED_EDID_VALID_MASK) * 128;
-	if (!len || !memchr_inv(in_edid, 0, len))
+	if (!len || !memchr_inv(edid, 0, len))
 		return NULL;
 
-	edid = in_edid;
+	drm_edid = drm_edid_alloc(edid, len);
 
-	if (len < EDID_LENGTH * (1 + edid->extensions)) {
-		drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5): too short\n");
-		return NULL;
-	}
-	new_edid = drm_edid_duplicate(edid);
-	if (!new_edid)
-		return NULL;
-	if (!drm_edid_is_valid(new_edid)) {
-		kfree(new_edid);
+	if (!drm_edid_valid(drm_edid)) {
 		drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5)\n");
-		return NULL;
+		drm_edid_free(drm_edid);
+		drm_edid = NULL;
 	}
-	return new_edid;
+
+	return drm_edid;
 }
 
 bool intel_opregion_headless_sku(struct drm_i915_private *i915)

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

@@ -74,7 +74,7 @@ int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
 int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
 				  pci_power_t state);
 int intel_opregion_get_panel_type(struct drm_i915_private *dev_priv);
-struct edid *intel_opregion_get_edid(struct intel_connector *connector);
+const struct drm_edid *intel_opregion_get_edid(struct intel_connector *connector);
 
 bool intel_opregion_headless_sku(struct drm_i915_private *i915);
 
@@ -123,7 +123,7 @@ static inline int intel_opregion_get_panel_type(struct drm_i915_private *dev)
 	return -ENODEV;
 }
 
-static inline struct edid *
+static inline const struct drm_edid *
 intel_opregion_get_edid(struct intel_connector *connector)
 {
 	return NULL;