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media: i2c: imx258: Follow normal V4L2 behaviours for clipping exposure

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V4L2 sensor drivers are expected to clip the supported exposure
range based on the VBLANK configured.
IMX258 wasn't doing that as register 0x350 (FRM_LENGTH_CTL)
switches it to a mode where frame length tracks coarse exposure time.

Disable this mode and clip the range for V4L2_CID_EXPOSURE appropriately
based on V4L2_CID_VBLANK.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Luis Garcia <git@luigi311.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Dave Stevenson 2024-05-01 09:24:27 -06:00 committed by Hans Verkuil
parent c699953f61
commit 8eaf1994a4
1 changed files with 23 additions and 2 deletions
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25
drivers/media/i2c/imx258.c
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@ -37,10 +37,11 @@
/* Exposure control */
#define IMX258_REG_EXPOSURE 0x0202
#define IMX258_EXPOSURE_OFFSET 10
#define IMX258_EXPOSURE_MIN 4
#define IMX258_EXPOSURE_STEP 1
#define IMX258_EXPOSURE_DEFAULT 0x640
#define IMX258_EXPOSURE_MAX 65535
#define IMX258_EXPOSURE_MAX (IMX258_VTS_MAX - IMX258_EXPOSURE_OFFSET)
/* Analog gain control */
#define IMX258_REG_ANALOG_GAIN 0x0204
@ -371,7 +372,7 @@ static const struct imx258_reg mode_common_regs[] = {
{ 0x303A, 0x00 },
{ 0x303B, 0x10 },
{ 0x300D, 0x00 },
{ 0x0350, 0x01 },
{ 0x0350, 0x00 },
{ 0x0204, 0x00 },
{ 0x0205, 0x00 },
{ 0x020E, 0x01 },
@ -734,6 +735,19 @@ static int imx258_update_digital_gain(struct imx258 *imx258, u32 len, u32 val)
return 0;
}
static void imx258_adjust_exposure_range(struct imx258 *imx258)
{
int exposure_max, exposure_def;
/* Honour the VBLANK limits when setting exposure. */
exposure_max = imx258->cur_mode->height + imx258->vblank->val -
IMX258_EXPOSURE_OFFSET;
exposure_def = min(exposure_max, imx258->exposure->val);
__v4l2_ctrl_modify_range(imx258->exposure, imx258->exposure->minimum,
exposure_max, imx258->exposure->step,
exposure_def);
}
static int imx258_set_ctrl(struct v4l2_ctrl *ctrl)
{
struct imx258 *imx258 =
@ -741,6 +755,13 @@ static int imx258_set_ctrl(struct v4l2_ctrl *ctrl)
struct i2c_client *client = v4l2_get_subdevdata(&imx258->sd);
int ret = 0;
/*
* The VBLANK control may change the limits of usable exposure, so check
* and adjust if necessary.
*/
if (ctrl->id == V4L2_CID_VBLANK)
imx258_adjust_exposure_range(imx258);
/*
* Applying V4L2 control value only happens
* when power is up for streaming