LF-16700 drm/bridge: it6263: Fix getting EDID for DRM_BRIDGE_ATTACH_NO_CONNECTOR case

If DRM_BRIDGE_ATTACH_NO_CONNECTOR flag is set when attaching the bridge,
this bridge driver won't create a DRM connector but instead relying on
other drivers to do that, i.e., a bridge connector is created by a DRM
driver.  In that case, it6263_get_edid() should use the connector
parameter of it6263_bridge_edid_read() to get EDID instead of the
connector created by this driver for the !DRM_BRIDGE_ATTACH_NO_CONNECTOR
case and cached in the main struct it6263, since the latter one is not
initialized at all for the DRM_BRIDGE_ATTACH_NO_CONNECTOR case.  Note
that it6263_bridge_edid_read(), as the drm_bridge_funcs::edid_read
callback, is supposed to be only called by bridge connector for the
DRM_BRIDGE_ATTACH_NO_CONNECTOR case.  So, pass the connector parameter
from it6263_bridge_edid_read() to it6263_get_edid() and use it to get
get EDID to avoid accessing the uninitialized connector.  While at it,
change the it6263_get_edid() function call in it6263_connector_get_modes()
accordingly.

Signed-off-by: Ji Luo <ji.luo@nxp.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Tested-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Co-developed-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>

Author: luoji-nxp

drivers/gpu/drm/bridge/it6263.c

@@ -594,12 +594,13 @@ it6263_read_edid(void *data, u8 *buf, unsigned int block, size_t len)
 	return 0;
 }
 
-static const struct drm_edid *it6263_get_edid(struct it6263 *it6263)
+static const struct drm_edid *
+it6263_get_edid(struct it6263 *it6263, struct drm_connector *connector)
 {
 	const struct drm_edid *drm_edid;
 	const struct edid *edid;
 
-	drm_edid = drm_edid_read_custom(&it6263->connector, it6263_read_edid, it6263);
+	drm_edid = drm_edid_read_custom(connector, it6263_read_edid, it6263);
 	if (!drm_edid) {
 		dev_warn(&it6263->hdmi_i2c->dev, "Failed to read EDID\n");
 		return NULL;
@@ -640,7 +641,7 @@ static int it6263_connector_get_modes(struct drm_connector *connector)
 	int num = 0;
 	int ret;
 
-	drm_edid = it6263_get_edid(it6263);
+	drm_edid = it6263_get_edid(it6263, connector);
 	if (!drm_edid)
 		return 0;
 
@@ -871,7 +872,7 @@ it6263_bridge_edid_read(struct drm_bridge *bridge,
 {
 	struct it6263 *it6263 = bridge_to_it6263(bridge);
 
-	return it6263_get_edid(it6263);
+	return it6263_get_edid(it6263, connector);
 }
 
 static enum drm_mode_status