linux-kernel - [PATCH v9 05/10] media: tegra-video: Separate CSI stream enable and disable implementations

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Date:   Thu, 6 Aug 2020 12:01:29 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     <skomatineni@...dia.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <frankc@...dia.com>, <hverkuil@...all.nl>,
        <sakari.ailus@....fi>, <robh+dt@...nel.org>,
        <helen.koike@...labora.com>
CC:     <digetx@...il.com>, <gregkh@...uxfoundation.org>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v9 05/10] 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@...il.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
 drivers/staging/media/tegra-video/csi.c | 51 ++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 16 deletions(-)

diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index fb667df..cfe6187 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/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;
 }
 
-- 
2.7.4