drm/bridge: it6505: switch to ->edid_read callback

Prefer using the struct drm_edid based callback and functions.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/5d2579802e277cc562bde6c4e26a5b63ff0e02ae.1706038510.git.jani.nikula@intel.com

drivers/gpu/drm/bridge/ite-it6505.c

@@ -458,7 +458,7 @@ struct it6505 {
 	/* it6505 driver hold option */
 	bool enable_drv_hold;
 
-	struct edid *cached_edid;
+	const struct drm_edid *cached_edid;
 };
 
 struct it6505_step_train_para {
@@ -2263,7 +2263,7 @@ static void it6505_plugged_status_to_codec(struct it6505 *it6505)
 
 static void it6505_remove_edid(struct it6505 *it6505)
 {
-	kfree(it6505->cached_edid);
+	drm_edid_free(it6505->cached_edid);
 	it6505->cached_edid = NULL;
 }
 
@@ -3034,15 +3034,16 @@ it6505_bridge_detect(struct drm_bridge *bridge)
 	return it6505_detect(it6505);
 }
 
-static struct edid *it6505_bridge_get_edid(struct drm_bridge *bridge,
-					   struct drm_connector *connector)
+static const struct drm_edid *it6505_bridge_edid_read(struct drm_bridge *bridge,
+						      struct drm_connector *connector)
 {
 	struct it6505 *it6505 = bridge_to_it6505(bridge);
 	struct device *dev = it6505->dev;
 
 	if (!it6505->cached_edid) {
-		it6505->cached_edid = drm_do_get_edid(connector, it6505_get_edid_block,
-						      it6505);
+		it6505->cached_edid = drm_edid_read_custom(connector,
+							   it6505_get_edid_block,
+							   it6505);
 
 		if (!it6505->cached_edid) {
 			DRM_DEV_DEBUG_DRIVER(dev, "failed to get edid!");
@@ -3050,7 +3051,7 @@ static struct edid *it6505_bridge_get_edid(struct drm_bridge *bridge,
 		}
 	}
 
-	return drm_edid_duplicate(it6505->cached_edid);
+	return drm_edid_dup(it6505->cached_edid);
 }
 
 static const struct drm_bridge_funcs it6505_bridge_funcs = {
@@ -3065,7 +3066,7 @@ static const struct drm_bridge_funcs it6505_bridge_funcs = {
 	.atomic_pre_enable = it6505_bridge_atomic_pre_enable,
 	.atomic_post_disable = it6505_bridge_atomic_post_disable,
 	.detect = it6505_bridge_detect,
-	.get_edid = it6505_bridge_get_edid,
+	.edid_read = it6505_bridge_edid_read,
 };
 
 static __maybe_unused int it6505_bridge_resume(struct device *dev)