linux-kernel - [PATCH v9 2/9] staging: imx-drm: imx-hdmi: return defer if can't get ddc i2c adapter

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Message-Id: <1415883284-3425-1-git-send-email-andy.yan@rock-chips.com>
Date:	Thu, 13 Nov 2014 20:54:44 +0800
From:	Andy Yan <andy.yan@...k-chips.com>
To:	airlied@...ux.ie, heiko@...ech.de, fabio.estevam@...escale.com,
	rmk+kernel@....linux.org.uk
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>,
	Andy yan <andy.yan@...k-chips.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Sean Paul <seanpaul@...omium.org>,
	Inki Dae <inki.dae@...sung.com>,
	Dave Airlie <airlied@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	Zubair.Kakakhel@...tec.com, djkurtz@...gle.com, ykk@...k-chips.com,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, jay.xu@...k-chips.com,
	Pawel Moll <pawel.moll@....com>, mark.yao@...k-chips.com,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: [PATCH v9 2/9] 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 v9: None
Changes in v8: None
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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