linux-kernel - [PATCH 2/2] drm/bridge: it66121: Wait for next bridge to be probed

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Message-Id: <20210827163956.27517-2-paul@crapouillou.net>
Date:   Fri, 27 Aug 2021 17:39:56 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Phong LE <ple@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, list@...ndingux.net,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/2] drm/bridge: it66121: Wait for next bridge to be probed

If run before the next bridge is initialized, of_drm_find_bridge() will
give us a NULL pointer.

If that's the case, return -EPROBE_DEFER; we may have more luck next
time.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/gpu/drm/bridge/ite-it66121.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index b130d01147c6..9dc41a7b9136 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -924,6 +924,9 @@ static int it66121_probe(struct i2c_client *client,
 	ctx->next_bridge = of_drm_find_bridge(ep);
 	of_node_put(ep);
 
+	if (!ctx->next_bridge)
+		return -EPROBE_DEFER;
+
 	i2c_set_clientdata(client, ctx);
 	mutex_init(&ctx->lock);
 
-- 
2.33.0