[PATCH 5.15 767/779] drm/bridge: tc358767: Fix (e)DP bridge endpoint parsing in dedicated function

[Greg Kroah-Hartman]

From: Marek Vasut <marex@xxxxxxx>

commit 9030a9e571b3ba250d3d450a98310e3c74ecaff4 upstream.

Per toshiba,tc358767.yaml DT binding document, port@2 the output (e)DP
port is optional. In case this port is not described in DT, the bridge
driver operates in DPI-to-DP mode. The drm_of_find_panel_or_bridge()
call in tc_probe_edp_bridge_endpoint() returns -ENODEV in case port@2
is not present in DT and this specific return value is incorrectly
propagated outside of tc_probe_edp_bridge_endpoint() function. All
other error values must be propagated and are propagated correctly.

Return 0 in case the port@2 is missing instead, that reinstates the
original behavior before the commit this patch fixes.

Fixes: 8478095a8c4b ("drm/bridge: tc358767: Move (e)DP bridge endpoint parsing into dedicated function")
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Jonas Karlman <jonas@xxxxxxxxx>
Cc: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: Marek Vasut <marex@xxxxxxx>
Cc: Maxime Ripard <maxime@xxxxxxxxxx>
Cc: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Cc: Robert Foss <robert.foss@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220428213132.447890-1-marex@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/tc358767.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1573,7 +1573,7 @@ static int tc_probe_edp_bridge_endpoint(
 		tc->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
 	}
 
-	return ret;
+	return 0;
 }
 
 static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)