From: Lucas Stach <l.stach@pengutronix.de>
Date: Mon, 10 Jul 2017 14:41:25 +0200
Subject: [PATCH] drm/bridge: tc358767: fix probe without attached output node
References: bnc#1060662
Patch-mainline: v4.12.8
Git-commit: d630213f2a47933e1037909273a20023ba3e598d

commit d630213f2a47933e1037909273a20023ba3e598d upstream.

The output node of the TC358767 is only used if another bridge is chained
behind it. Panels attached to the TC358767 can be detected using the usual
DP AUX probing. This restores the old behavior of ignoring the output if
no endpoint is found.

Fixes: ebc944613567 (drm: convert drivers to use drm_of_find_panel_or_bridge)
Acked-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20170710124125.9019-1-l.stach@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/gpu/drm/bridge/tc358767.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 5c26488e7a2d..0529e500c534 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1255,7 +1255,7 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	/* port@2 is the output port */
 	ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL);
-	if (ret)
+	if (ret && ret != -ENODEV)
 		return ret;
 
 	/* Shut down GPIO is optional */
-- 
2.14.2