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media: i2c: cap exposure at height + vblank in ov8865

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Exposure limits depend on the total height; when vblank is altered (and
thus the total height is altered), change the exposure limits to reflect
the new cap.

Signed-off-by: Daniel Scally <djrscally@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Daniel Scally 2021-11-23 01:00:12 +01:00 committed by Mauro Carvalho Chehab
parent 295786e535
commit ca28690ebe
1 changed files with 26 additions and 2 deletions
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28
drivers/media/i2c/ov8865.c
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@ -143,6 +143,7 @@
#define OV8865_EXPOSURE_CTRL_L_REG 0x3502
#define OV8865_EXPOSURE_CTRL_L(v) ((v) & GENMASK(7, 0))
#define OV8865_EXPOSURE_GAIN_MANUAL_REG 0x3503
#define OV8865_INTEGRATION_TIME_MARGIN 8
#define OV8865_GAIN_CTRL_H_REG 0x3508
#define OV8865_GAIN_CTRL_H(v) (((v) & GENMASK(12, 8)) >> 8)
@ -677,6 +678,7 @@ struct ov8865_ctrls {
struct v4l2_ctrl *pixel_rate;
struct v4l2_ctrl *hblank;
struct v4l2_ctrl *vblank;
struct v4l2_ctrl *exposure;
struct v4l2_ctrl_handler handler;
};
@ -2454,6 +2456,20 @@ static int ov8865_s_ctrl(struct v4l2_ctrl *ctrl)
unsigned int index;
int ret;
/* If VBLANK is altered we need to update exposure to compensate */
if (ctrl->id == V4L2_CID_VBLANK) {
int exposure_max;
exposure_max = sensor->state.mode->output_size_y + ctrl->val -
OV8865_INTEGRATION_TIME_MARGIN;
__v4l2_ctrl_modify_range(sensor->ctrls.exposure,
sensor->ctrls.exposure->minimum,
exposure_max,
sensor->ctrls.exposure->step,
min(sensor->ctrls.exposure->val,
exposure_max));
}
/* Wait for the sensor to be on before setting controls. */
if (pm_runtime_suspended(sensor->dev))
return 0;
@ -2510,8 +2526,8 @@ static int ov8865_ctrls_init(struct ov8865_sensor *sensor)
/* Exposure */
v4l2_ctrl_new_std(handler, ops, V4L2_CID_EXPOSURE, 16, 1048575, 16,
512);
ctrls->exposure = v4l2_ctrl_new_std(handler, ops, V4L2_CID_EXPOSURE, 16,
1048575, 16, 512);
/* Gain */
@ -2700,6 +2716,7 @@ static int ov8865_set_fmt(struct v4l2_subdev *subdev,
u32 mbus_code = 0;
unsigned int hblank;
unsigned int index;
int exposure_max;
int ret = 0;
mutex_lock(&sensor->mutex);
@ -2747,6 +2764,13 @@ static int ov8865_set_fmt(struct v4l2_subdev *subdev,
__v4l2_ctrl_modify_range(sensor->ctrls.hblank, hblank, hblank, 1,
hblank);
exposure_max = mode->vts - OV8865_INTEGRATION_TIME_MARGIN;
__v4l2_ctrl_modify_range(sensor->ctrls.exposure,
sensor->ctrls.exposure->minimum, exposure_max,
sensor->ctrls.exposure->step,
min(sensor->ctrls.exposure->val,
exposure_max));
complete:
mutex_unlock(&sensor->mutex);