From: Andy Yan <andy.yan@rock-chips.com>
Date: Fri, 5 Dec 2014 06:24:28 +0000 (+0800)
Subject: drm: imx: imx-hdmi: return defer if can't get ddc i2c adapter
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c2c3848851a723a0e5e0fec22df395a885edf459;p=openwrt%2Fstaging%2Fblogic.git

drm: imx: imx-hdmi: return defer if can't get ddc i2c adapter

drm driver may probe before the i2c bus, so the driver should
defer probing until it is available

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---

diff --git a/drivers/gpu/drm/imx/imx-hdmi.c b/drivers/gpu/drm/imx/imx-hdmi.c
index 3f96a5e6670d..3118dde3ea62 100644
--- a/drivers/gpu/drm/imx/imx-hdmi.c
+++ b/drivers/gpu/drm/imx/imx-hdmi.c
@@ -1611,10 +1611,12 @@ static int imx_hdmi_bind(struct device *dev, struct device *master, void *data)
 	ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0);
 	if (ddc_node) {
 		hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node);
-		if (!hdmi->ddc)
+		of_node_put(ddc_node);
+		if (!hdmi->ddc) {
 			dev_dbg(hdmi->dev, "failed to read ddc node\n");
+			return -EPROBE_DEFER;
+		}
 
-		of_node_put(ddc_node);
 	} else {
 		dev_dbg(hdmi->dev, "no ddc property found\n");
 	}