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

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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>
This commit is contained in:
Andy Yan 2014-12-05 14:24:28 +08:00 committed by Philipp Zabel
parent b587833933
commit c2c3848851
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/imx/imx-hdmi.c
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@ -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)
dev_dbg(hdmi->dev, "failed to read ddc node\n");
of_node_put(ddc_node);
if (!hdmi->ddc) {
dev_dbg(hdmi->dev, "failed to read ddc node\n");
return -EPROBE_DEFER;
}
} else {
dev_dbg(hdmi->dev, "no ddc property found\n");
}