From: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Exposure is clipped by the VTS of the mode, so it needs to be updated
when this is changed.
Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
---
drivers/media/i2c/ov5647.c | 39 ++++++++++++++++++++++++++++++++++----
1 file changed, 35 insertions(+), 4 deletions(-)
diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
index 654009be0d110..70eafc5390e1f 100644
--- a/drivers/media/i2c/ov5647.c
+++ b/drivers/media/i2c/ov5647.c
@@ -73,6 +73,11 @@
#define OV5647_VBLANK_MIN 4
#define OV5647_VTS_MAX 32767
+#define OV5647_EXPOSURE_MIN 4
+#define OV5647_EXPOSURE_STEP 1
+#define OV5647_EXPOSURE_DEFAULT 1000
+#define OV5647_EXPOSURE_MAX 65535
+
struct regval_list {
u16 addr;
u8 data;
@@ -107,6 +112,7 @@ struct ov5647 {
struct v4l2_ctrl *pixel_rate;
struct v4l2_ctrl *hblank;
struct v4l2_ctrl *vblank;
+ struct v4l2_ctrl *exposure;
};
static inline struct ov5647 *to_sensor(struct v4l2_subdev *sd)
@@ -1092,6 +1098,7 @@ static int ov5647_set_pad_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *fmt = &format->format;
const struct ov5647_mode *ov5647_mode_list;
struct ov5647 *sensor = to_sensor(sd);
+
const struct ov5647_mode *mode;
unsigned int num_modes;
unsigned int i;
@@ -1123,6 +1130,7 @@ 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 exposure_max, exposure_def;
int hblank, vblank;
sensor->mode = mode;
@@ -1138,6 +1146,13 @@ static int ov5647_set_pad_fmt(struct v4l2_subdev *sd,
OV5647_VTS_MAX - mode->format.height,
1, vblank);
__v4l2_ctrl_s_ctrl(sensor->vblank, vblank);
+
+ exposure_max = mode->vts - 4;
+ exposure_def = min(exposure_max, OV5647_EXPOSURE_DEFAULT);
+ __v4l2_ctrl_modify_range(sensor->exposure,
+ sensor->exposure->minimum,
+ exposure_max, sensor->exposure->step,
+ exposure_def);
}
*fmt = mode->format;
mutex_unlock(&sensor->lock);
@@ -1324,6 +1339,18 @@ static int ov5647_s_ctrl(struct v4l2_ctrl *ctrl)
/* v4l2_ctrl_lock() locks our own mutex */
+ if (ctrl->id == V4L2_CID_VBLANK) {
+ int exposure_max, exposure_def;
+
+ /* Update max exposure while meeting expected vblanking */
+ exposure_max = sensor->mode->format.height + ctrl->val - 4;
+ exposure_def = min(exposure_max, OV5647_EXPOSURE_DEFAULT);
+ __v4l2_ctrl_modify_range(sensor->exposure,
+ sensor->exposure->minimum,
+ exposure_max, sensor->exposure->step,
+ exposure_def);
+ }
+
/*
* If the device is not powered up by the host driver do
* not apply any controls to H/W at this time. Instead
@@ -1369,7 +1396,7 @@ static const struct v4l2_ctrl_ops ov5647_ctrl_ops = {
static int ov5647_init_controls(struct ov5647 *sensor)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
- int hblank;
+ int hblank, exposure_max, exposure_def;
v4l2_ctrl_handler_init(&sensor->ctrls, 8);
@@ -1383,9 +1410,13 @@ static int ov5647_init_controls(struct ov5647 *sensor)
V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL,
0, V4L2_EXPOSURE_MANUAL);
- /* min: 4 lines; max: 0xffff lines; default: 1000 lines. */
- v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
- V4L2_CID_EXPOSURE, 4, 65535, 1, 1000);
+ exposure_max = sensor->mode->vts - 4;
+ exposure_def = min(exposure_max, OV5647_EXPOSURE_DEFAULT);
+ sensor->exposure = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
+ V4L2_CID_EXPOSURE,
+ OV5647_EXPOSURE_MIN,
+ exposure_max, OV5647_EXPOSURE_STEP,
+ exposure_def);
/* min: 16 = 1.0x; max (10 bits); default: 32 = 2.0x. */
v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
--
2.29.1
