linux-kernel - [Patch 1/3] media: ov5640: add PIXEL

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Date:   Wed, 25 Sep 2019 10:22:59 -0500
From:   Benoit Parrot <bparrot@...com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
CC:     <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Benoit Parrot <bparrot@...com>
Subject: [Patch 1/3] media: ov5640: add PIXEL_RATE control

Add v4l2 controls to report the pixel rates of each mode. This is
needed by some CSI2 receiver in order to perform proper DPHY
configuration.

Signed-off-by: Benoit Parrot <bparrot@...com>
---
 drivers/media/i2c/ov5640.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 500d9bbff10b..c2a44f30d56e 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -193,6 +193,9 @@ struct ov5640_mode_info {
 
 struct ov5640_ctrls {
 	struct v4l2_ctrl_handler handler;
+	struct {
+		struct v4l2_ctrl *pixel_rate;
+	};
 	struct {
 		struct v4l2_ctrl *auto_exp;
 		struct v4l2_ctrl *exposure;
@@ -241,6 +244,7 @@ struct ov5640_dev {
 	const struct ov5640_mode_info *last_mode;
 	enum ov5640_frame_rate current_fr;
 	struct v4l2_fract frame_interval;
+	u64 pixel_rate;
 
 	struct ov5640_ctrls ctrls;
 
@@ -2202,6 +2206,7 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd,
 	const struct ov5640_mode_info *new_mode;
 	struct v4l2_mbus_framefmt *mbus_fmt = &format->format;
 	struct v4l2_mbus_framefmt *fmt;
+	u64 rate;
 	int ret;
 
 	if (format->pad != 0)
@@ -2233,6 +2238,12 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd,
 	if (mbus_fmt->code != sensor->fmt.code)
 		sensor->pending_fmt_change = true;
 
+	rate = sensor->current_mode->vtot * sensor->current_mode->htot;
+	rate *= ov5640_framerates[sensor->current_fr];
+	sensor->pixel_rate = rate;
+
+	__v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate,
+				 sensor->pixel_rate);
 out:
 	mutex_unlock(&sensor->lock);
 	return ret;
@@ -2657,6 +2668,13 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 	/* we can use our own mutex for the ctrl lock */
 	hdl->lock = &sensor->lock;
 
+	/* Clock related controls */
+	ctrls->pixel_rate =
+		v4l2_ctrl_new_std(hdl, ops,
+				  V4L2_CID_PIXEL_RATE, 0, INT_MAX, 1,
+				  55969920);
+	ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
 	/* Auto/manual white balance */
 	ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
 					   V4L2_CID_AUTO_WHITE_BALANCE,
@@ -2782,6 +2800,7 @@ static int ov5640_s_frame_interval(struct v4l2_subdev *sd,
 	struct ov5640_dev *sensor = to_ov5640_dev(sd);
 	const struct ov5640_mode_info *mode;
 	int frame_rate, ret = 0;
+	u64 rate;
 
 	if (fi->pad != 0)
 		return -EINVAL;
@@ -2816,6 +2835,12 @@ static int ov5640_s_frame_interval(struct v4l2_subdev *sd,
 		sensor->frame_interval = fi->interval;
 		sensor->current_mode = mode;
 		sensor->pending_mode_change = true;
+
+		rate = sensor->current_mode->vtot * sensor->current_mode->htot;
+		rate *= ov5640_framerates[sensor->current_fr];
+		sensor->pixel_rate = rate;
+		__v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate,
+					 sensor->pixel_rate);
 	}
 out:
 	mutex_unlock(&sensor->lock);
-- 
2.17.1