linux-kernel - [PATCH v7 2/7] staging: imx-drm: imx-hdmi: return defer if can't get ddc i2c adapter

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Date:	Tue, 11 Nov 2014 20:12:27 +0800
From:	Andy Yan <andy.yan@...k-chips.com>
To:	airlied@...ux.ie, Zubair.Kakakhel@...tec.com,
	rmk+kernel@....linux.org.uk, fabio.estevam@...escale.com,
	heiko@...ech.de, djkurtz@...omium.org, ykk@...k-chips.com
Cc:	Andy Yan <andy.yan@...k-chips.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v7 2/7] staging: imx-drm: 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@...k-chips.com>

---

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4:
- defer probe ddc i2c adapter

Changes in v3: None
Changes in v2: None

 drivers/staging/imx-drm/imx-hdmi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/imx-drm/imx-hdmi.c b/drivers/staging/imx-drm/imx-hdmi.c
index 79daec4..c2b035a 100644
--- a/drivers/staging/imx-drm/imx-hdmi.c
+++ b/drivers/staging/imx-drm/imx-hdmi.c
@@ -1611,8 +1611,11 @@ 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)
+		if (!hdmi->ddc) {
 			dev_dbg(hdmi->dev, "failed to read ddc node\n");
+			of_node_put(ddc_node);
+			return -EPROBE_DEFER;
+		}
 
 		of_node_put(ddc_node);
 	} else {
-- 
1.9.1

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