media: i2c: imx355: Drop system suspend and resume handlers

Stopping streaming on a camera pipeline at system suspend time, and
restarting it at system resume time, requires coordinated action between
the bridge driver and the camera sensor driver. This is handled by the
bridge driver calling the sensor's .s_stream() handler at system suspend
and resume time. There is thus no need for the sensor to independently
implement system sleep PM operations. Drop them.

The streaming field of the driver's private structure is now unused,
drop it as well.

Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/i2c/imx355.c

···
 	 * Protect access to sensor v4l2 controls.
 	 */
 	struct mutex mutex;
-
-	/* Streaming on/off */
-	bool streaming;
 };
 
 static const struct imx355_reg imx355_global_regs[] = {
···
 		pm_runtime_put(&client->dev);
 	}
 
-	imx355->streaming = enable;
-
 	/* vflip and hflip cannot change during streaming */
 	__v4l2_ctrl_grab(imx355->vflip, enable);
 	__v4l2_ctrl_grab(imx355->hflip, enable);
···
 err_unlock:
 	mutex_unlock(&imx355->mutex);
 
-	return ret;
-}
-
-static int __maybe_unused imx355_suspend(struct device *dev)
-{
-	struct v4l2_subdev *sd = dev_get_drvdata(dev);
-	struct imx355 *imx355 = to_imx355(sd);
-
-	if (imx355->streaming)
-		imx355_stop_streaming(imx355);
-
-	return 0;
-}
-
-static int __maybe_unused imx355_resume(struct device *dev)
-{
-	struct v4l2_subdev *sd = dev_get_drvdata(dev);
-	struct imx355 *imx355 = to_imx355(sd);
-	int ret;
-
-	if (imx355->streaming) {
-		ret = imx355_start_streaming(imx355);
-		if (ret)
-			goto error;
-	}
-
-	return 0;
-
-error:
-	imx355_stop_streaming(imx355);
-	imx355->streaming = 0;
 	return ret;
 }
 
···
 	mutex_destroy(&imx355->mutex);
 }
 
-static const struct dev_pm_ops imx355_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(imx355_suspend, imx355_resume)
-};
-
 static const struct acpi_device_id imx355_acpi_ids[] __maybe_unused = {
 	{ "SONY355A" },
 	{ /* sentinel */ }
···
 static struct i2c_driver imx355_i2c_driver = {
 	.driver = {
 		.name = "imx355",
-		.pm = &imx355_pm_ops,
 		.acpi_match_table = ACPI_PTR(imx355_acpi_ids),
 	},
 	.probe = imx355_probe,