Currently, the V4L2 subdevice is also created when the device is not available/connected. In this case, dmesg shows the following: [ 10.419510] imx290 7-001a: Error writing reg 0x301c: -6 [ 10.428981] imx290 7-001a: Error writing reg 0x3020: -6 [ 10.442712] imx290 7-001a: Error writing reg 0x3018: -6 [ 10.454018] imx290 7-001a: Error writing reg 0x3020: -6 which seems to come from imx290_ctrl_update() after the subdev init is finished. However, as the errors are ignored, the subdev is initialized but simply does not work. From userspace perspective, there is no visible difference between a working and not-working subdevice (except when trying it out or watching for the error message). This commit adds a simple availability check before starting with the subdev initialization to error out instead. Signed-off-by: Benjamin Bara <benjamin.bara@xxxxxxxxxxx> --- drivers/media/i2c/imx290.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c index 4150e6e4b9a6..a86076e42a36 100644 --- a/drivers/media/i2c/imx290.c +++ b/drivers/media/i2c/imx290.c @@ -1580,6 +1580,11 @@ static int imx290_probe(struct i2c_client *client) pm_runtime_set_autosuspend_delay(dev, 1000); pm_runtime_use_autosuspend(dev); + /* Make sure the sensor is available before V4L2 subdev init. */ + ret = cci_read(imx290->regmap, IMX290_STANDBY, NULL, NULL); + if (ret) + goto err_pm; + /* Initialize the V4L2 subdev. */ ret = imx290_subdev_init(imx290); if (ret) -- 2.46.0
