drm/bridge: tc358767: fix probe without attached output node

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>

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 5c26488e7a2d7a0320ddf321375b8ff4c200185f..0529e500c5341ed5e0d93bb658cd42d9288b13ad 100644 (file)
--- 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 */