linux-kernel - [PATCH 4.12 21/65] drm/bridge: tc358767: fix probe without attached output node

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Message-Id: <20170815011943.237179162@linuxfoundation.org>
Date:   Mon, 14 Aug 2017 18:19:12 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Archit Taneja <architt@...eaurora.org>
Subject: [PATCH 4.12 21/65] drm/bridge: tc358767: fix probe without attached output node

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lucas Stach <l.stach@...gutronix.de>

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@...entembedded.com>
Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Signed-off-by: Archit Taneja <architt@...eaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20170710124125.9019-1-l.stach@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -1255,7 +1255,7 @@ static int tc_probe(struct i2c_client *c
 
 	/* 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 */