media: ov5647: Support V4L2_CID_PIXEL_RATE

Clients need to know the pixel rate in order to compute exposure
and frame rate values. Advertise it.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov5647.c

@@ -76,6 +76,7 @@ struct regval_list {
 struct ov5647_mode {
 	struct v4l2_mbus_framefmt	format;
 	struct v4l2_rect		crop;
+	u64				pixel_rate;
 	const struct regval_list	*reg_list;
 	unsigned int			num_regs;
 };
@@ -96,6 +97,7 @@ struct ov5647 {
 	bool				clock_ncont;
 	struct v4l2_ctrl_handler	ctrls;
 	const struct ov5647_mode	*mode;
+	struct v4l2_ctrl		*pixel_rate;
 };
 
 static inline struct ov5647 *to_sensor(struct v4l2_subdev *sd)
@@ -582,6 +584,7 @@ static const struct ov5647_mode ov5647_8bpp_modes[] = {
 			.width		= 1280,
 			.height		= 960,
 		},
+		.pixel_rate	= 77291670,
 		.reg_list	= ov5647_640x480_8bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_640x480_8bpp)
 	},
@@ -603,6 +606,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 			.width		= 2592,
 			.height		= 1944
 		},
+		.pixel_rate	= 87500000,
 		.reg_list	= ov5647_2592x1944_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_2592x1944_10bpp)
 	},
@@ -621,6 +625,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 			.width		= 1928,
 			.height		= 1080,
 		},
+		.pixel_rate	= 81666700,
 		.reg_list	= ov5647_1080p30_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_1080p30_10bpp)
 	},
@@ -639,6 +644,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 			.width		= 2592,
 			.height		= 1944,
 		},
+		.pixel_rate	= 81666700,
 		.reg_list	= ov5647_2x2binned_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_2x2binned_10bpp)
 	},
@@ -657,6 +663,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 			.width		= 2560,
 			.height		= 1920,
 		},
+		.pixel_rate	= 55000000,
 		.reg_list	= ov5647_640x480_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_640x480_10bpp)
 	},
@@ -1080,10 +1087,13 @@ static int ov5647_set_pad_fmt(struct v4l2_subdev *sd,
 
 	/* Update the sensor mode and apply at it at streamon time. */
 	mutex_lock(&sensor->lock);
-	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 		*v4l2_subdev_get_try_format(sd, cfg, format->pad) = mode->format;
-	else
+	} else {
 		sensor->mode = mode;
+		__v4l2_ctrl_modify_range(sensor->pixel_rate, mode->pixel_rate,
+					 mode->pixel_rate, 1, mode->pixel_rate);
+	}
 	*fmt = mode->format;
 	mutex_unlock(&sensor->lock);
 
@@ -1288,6 +1298,9 @@ static int ov5647_s_ctrl(struct v4l2_ctrl *ctrl)
 		return  ov5647_s_analogue_gain(sd, ctrl->val);
 	case V4L2_CID_EXPOSURE:
 		return ov5647_s_exposure(sd, ctrl->val);
+	case V4L2_CID_PIXEL_RATE:
+		/* Read-only, but we adjust it based on mode. */
+		return 0;
 	default:
 		dev_info(&client->dev,
 			 "Control (id:0x%x, val:0x%x) not supported\n",
@@ -1306,7 +1319,7 @@ static int ov5647_init_controls(struct ov5647 *sensor)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
 
-	v4l2_ctrl_handler_init(&sensor->ctrls, 5);
+	v4l2_ctrl_handler_init(&sensor->ctrls, 6);
 
 	v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
 			  V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
@@ -1326,18 +1339,26 @@ static int ov5647_init_controls(struct ov5647 *sensor)
 	v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
 			  V4L2_CID_ANALOGUE_GAIN, 16, 1023, 1, 32);
 
-	if (sensor->ctrls.error) {
-		dev_err(&client->dev,
-			"%s Controls initialization failed (%d)\n",
-			__func__, sensor->ctrls.error);
-		v4l2_ctrl_handler_free(&sensor->ctrls);
-
-		return sensor->ctrls.error;
-	}
+	/* By default, PIXEL_RATE is read only, but it does change per mode */
+	sensor->pixel_rate = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
+					       V4L2_CID_PIXEL_RATE,
+					       sensor->mode->pixel_rate,
+					       sensor->mode->pixel_rate, 1,
+					       sensor->mode->pixel_rate);
+	if (sensor->ctrls.error)
+		goto handler_free;
 
+	sensor->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 	sensor->sd.ctrl_handler = &sensor->ctrls;
 
 	return 0;
+
+handler_free:
+	dev_err(&client->dev, "%s Controls initialization failed (%d)\n",
+		__func__, sensor->ctrls.error);
+	v4l2_ctrl_handler_free(&sensor->ctrls);
+
+	return sensor->ctrls.error;
 }
 
 static int ov5647_parse_dt(struct ov5647 *sensor, struct device_node *np)