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

Signed-off-by: Andy Yan <andy....@rock-chips.com>
Reviewed-by: Daniel Kurtz <djku...@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");
        }
-- 
1.9.1


_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Reply via email to