media: tegra-video: Separate CSI stream enable and disable implementations

This patch separates implementation of CSI stream enable and disable
into separate functions for readability.
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/tegra-video/csi.c

@@ -232,34 +232,53 @@ static int tegra_csi_g_frame_interval(struct v4l2_subdev *subdev,
 	return 0;
 }
 
-static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
+static int tegra_csi_enable_stream(struct v4l2_subdev *subdev)
 {
 	struct tegra_vi_channel *chan = v4l2_get_subdev_hostdata(subdev);
 	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
 	struct tegra_csi *csi = csi_chan->csi;
-	int ret = 0;
+	int ret;
+
+	ret = pm_runtime_get_sync(csi->dev);
+	if (ret < 0) {
+		dev_err(csi->dev, "failed to get runtime PM: %d\n", ret);
+		pm_runtime_put_noidle(csi->dev);
+		return ret;
+	}
 
 	csi_chan->pg_mode = chan->pg_mode;
-	if (enable) {
-		ret = pm_runtime_get_sync(csi->dev);
-		if (ret < 0) {
-			dev_err(csi->dev,
-				"failed to get runtime PM: %d\n", ret);
-			pm_runtime_put_noidle(csi->dev);
-			return ret;
-		}
+	ret = csi->ops->csi_start_streaming(csi_chan);
+	if (ret < 0)
+		goto rpm_put;
 
-		ret = csi->ops->csi_start_streaming(csi_chan);
-		if (ret < 0)
-			goto rpm_put;
+	return 0;
 
-		return 0;
-	}
+rpm_put:
+	pm_runtime_put(csi->dev);
+	return ret;
+}
+
+static int tegra_csi_disable_stream(struct v4l2_subdev *subdev)
+{
+	struct tegra_csi_channel *csi_chan = to_csi_chan(subdev);
+	struct tegra_csi *csi = csi_chan->csi;
 
 	csi->ops->csi_stop_streaming(csi_chan);
 
-rpm_put:
 	pm_runtime_put(csi->dev);
+
+	return 0;
+}
+
+static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+	int ret;
+
+	if (enable)
+		ret = tegra_csi_enable_stream(subdev);
+	else
+		ret = tegra_csi_disable_stream(subdev);
+
 	return ret;
 }