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media: imx355: Define the exposure offset, and use that define

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The difference between frame length and max exposure time in
lines is 10. That had been used as a bare value in calculations.

Move it to a define, and use that define.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
This commit is contained in:
Dave Stevenson
2026-07-15 12:43:29 +01:00
committed by Sakari Ailus
parent ba533bb043
commit f31cb77bb1
1 changed files with 3 additions and 2 deletions
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5
drivers/media/i2c/imx355.c
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@@ -51,6 +51,7 @@
#define IMX355_EXPOSURE_MIN 1
#define IMX355_EXPOSURE_STEP 1
#define IMX355_EXPOSURE_DEFAULT 0x0282
#define IMX355_EXPOSURE_OFFSET 10
/* Analog gain control */
#define IMX355_REG_ANALOG_GAIN CCI_REG16(0x0204)
@@ -635,7 +636,7 @@ static int imx355_set_ctrl(struct v4l2_ctrl *ctrl)
switch (ctrl->id) {
case V4L2_CID_VBLANK:
/* Update max exposure while meeting expected vblanking */
max = imx355->cur_mode->height + ctrl->val - 10;
max = imx355->cur_mode->height + ctrl->val - IMX355_EXPOSURE_OFFSET;
__v4l2_ctrl_modify_range(imx355->exposure,
imx355->exposure->minimum,
max, imx355->exposure->step, max);
@@ -1130,7 +1131,7 @@ static int imx355_init_controls(struct imx355 *imx355)
imx355->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
/* fll >= exposure time + adjust parameter (default value is 10) */
exposure_max = mode->fll_def - 10;
exposure_max = mode->fll_def - IMX355_EXPOSURE_OFFSET;
imx355->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &imx355_ctrl_ops,
V4L2_CID_EXPOSURE,
IMX355_EXPOSURE_MIN, exposure_max,