media: ov5647: Support V4L2_CID_VBLANK control

Adds vblank control to allow for frame rate control.
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

@@ -50,6 +50,8 @@
 #define OV5647_REG_AEC_AGC		0x3503
 #define OV5647_REG_GAIN_HI		0x350a
 #define OV5647_REG_GAIN_LO		0x350b
+#define OV5647_REG_VTS_HI		0x380e
+#define OV5647_REG_VTS_LO		0x380f
 #define OV5647_REG_FRAME_OFF_NUMBER	0x4202
 #define OV5647_REG_MIPI_CTRL00		0x4800
 #define OV5647_REG_MIPI_CTRL14		0x4814
@@ -68,6 +70,9 @@
 #define OV5647_PIXEL_ARRAY_WIDTH	2592U
 #define OV5647_PIXEL_ARRAY_HEIGHT	1944U
 
+#define OV5647_VBLANK_MIN		4
+#define OV5647_VTS_MAX			32767
+
 struct regval_list {
 	u16 addr;
 	u8 data;
@@ -78,6 +83,7 @@ struct ov5647_mode {
 	struct v4l2_rect		crop;
 	u64				pixel_rate;
 	int				hts;
+	int				vts;
 	const struct regval_list	*reg_list;
 	unsigned int			num_regs;
 };
@@ -100,6 +106,7 @@ struct ov5647 {
 	const struct ov5647_mode	*mode;
 	struct v4l2_ctrl		*pixel_rate;
 	struct v4l2_ctrl		*hblank;
+	struct v4l2_ctrl		*vblank;
 };
 
 static inline struct ov5647 *to_sensor(struct v4l2_subdev *sd)
@@ -151,8 +158,6 @@ static const struct regval_list ov5647_640x480_8bpp[] = {
 	{0x3b07, 0x0c},
 	{0x380c, 0x07},
 	{0x380d, 0x68},
-	{0x380e, 0x03},
-	{0x380f, 0xd8},
 	{0x3814, 0x31},
 	{0x3815, 0x31},
 	{0x3708, 0x64},
@@ -588,6 +593,7 @@ static const struct ov5647_mode ov5647_8bpp_modes[] = {
 		},
 		.pixel_rate	= 77291670,
 		.hts		= 1896,
+		.vts		= 0x3d8,
 		.reg_list	= ov5647_640x480_8bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_640x480_8bpp)
 	},
@@ -611,6 +617,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 		},
 		.pixel_rate	= 87500000,
 		.hts		= 2844,
+		.vts		= 0x7b0,
 		.reg_list	= ov5647_2592x1944_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_2592x1944_10bpp)
 	},
@@ -631,6 +638,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 		},
 		.pixel_rate	= 81666700,
 		.hts		= 2416,
+		.vts		= 0x450,
 		.reg_list	= ov5647_1080p30_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_1080p30_10bpp)
 	},
@@ -651,6 +659,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 		},
 		.pixel_rate	= 81666700,
 		.hts		= 1896,
+		.vts		= 0x59b,
 		.reg_list	= ov5647_2x2binned_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_2x2binned_10bpp)
 	},
@@ -671,6 +680,7 @@ static const struct ov5647_mode ov5647_10bpp_modes[] = {
 		},
 		.pixel_rate	= 55000000,
 		.hts		= 1852,
+		.vts		= 0x1f8,
 		.reg_list	= ov5647_640x480_10bpp,
 		.num_regs	= ARRAY_SIZE(ov5647_640x480_10bpp)
 	},
@@ -695,6 +705,22 @@ static const struct ov5647_format_list ov5647_formats[] = {
 #define OV5647_DEFAULT_MODE	(&ov5647_formats[1].modes[3])
 #define OV5647_DEFAULT_FORMAT	(ov5647_formats[1].modes[3].format)
 
+static int ov5647_write16(struct v4l2_subdev *sd, u16 reg, u16 val)
+{
+	unsigned char data[4] = { reg >> 8, reg & 0xff, val >> 8, val & 0xff};
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	int ret;
+
+	ret = i2c_master_send(client, data, 4);
+	if (ret < 0) {
+		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
+			__func__, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val)
 {
 	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
@@ -1097,7 +1123,7 @@ static int ov5647_set_pad_fmt(struct v4l2_subdev *sd,
 	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 		*v4l2_subdev_get_try_format(sd, cfg, format->pad) = mode->format;
 	} else {
-		int hblank;
+		int hblank, vblank;
 
 		sensor->mode = mode;
 		__v4l2_ctrl_modify_range(sensor->pixel_rate, mode->pixel_rate,
@@ -1106,6 +1132,12 @@ static int ov5647_set_pad_fmt(struct v4l2_subdev *sd,
 		hblank = mode->hts - mode->format.width;
 		__v4l2_ctrl_modify_range(sensor->hblank, hblank, hblank, 1,
 					 hblank);
+
+		vblank = mode->vts - mode->format.height;
+		__v4l2_ctrl_modify_range(sensor->vblank, OV5647_VBLANK_MIN,
+					 OV5647_VTS_MAX - mode->format.height,
+					 1, vblank);
+		__v4l2_ctrl_s_ctrl(sensor->vblank, vblank);
 	}
 	*fmt = mode->format;
 	mutex_unlock(&sensor->lock);
@@ -1317,6 +1349,9 @@ static int ov5647_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_HBLANK:
 		/* Read-only, but we adjust it based on mode. */
 		return 0;
+	case V4L2_CID_VBLANK:
+		return ov5647_write16(sd, OV5647_REG_VTS_HI,
+				      sensor->mode->format.height + ctrl->val);
 	default:
 		dev_info(&client->dev,
 			 "Control (id:0x%x, val:0x%x) not supported\n",
@@ -1336,7 +1371,7 @@ static int ov5647_init_controls(struct ov5647 *sensor)
 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
 	int hblank;
 
-	v4l2_ctrl_handler_init(&sensor->ctrls, 7);
+	v4l2_ctrl_handler_init(&sensor->ctrls, 8);
 
 	v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
 			  V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
@@ -1369,6 +1404,13 @@ static int ov5647_init_controls(struct ov5647 *sensor)
 					   V4L2_CID_HBLANK, hblank, hblank, 1,
 					   hblank);
 
+	sensor->vblank = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
+					   V4L2_CID_VBLANK, OV5647_VBLANK_MIN,
+					   OV5647_VTS_MAX -
+					   sensor->mode->format.height, 1,
+					   sensor->mode->vts -
+					   sensor->mode->format.height);
+
 	if (sensor->ctrls.error)
 		goto handler_free;