[PATCH v18 02/12] drm: imx: imx-hdmi: return defer if can't get ddc i2c adapter

Andy Yan andy.yan at rock-chips.com
Thu Dec 4 22:24:28 PST 2014

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 at rock-chips.com>
Reviewed-by: Daniel Kurtz <djkurtz at chromium.org>


Changes in v18: None
Changes in v17: None
Changes in v16: None
Changes in v15: None
Changes in v14: None
Changes in v13: None
Changes in v12:
- refactor of_node_put(ddc_node)

Changes in v11: None
Changes in v10: None
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

 drivers/gpu/drm/imx/imx-hdmi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/imx/imx-hdmi.c b/drivers/gpu/drm/imx/imx-hdmi.c
index 7fd90ae..7a54d20 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");

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