Re: [PATCH] media: imx335: Set vblank immediately

From: nicolas
Date: Fri Feb 14 2025 - 09:45:33 EST


Hi,

Le vendredi 14 février 2025 à 22:37 +0900, Paul Elder a écrit :
> When the vblank v4l2 control is set, it does not get written to the
> hardware immediately. It only gets updated when exposure is set.
> Change
> the behavior such that the vblank is written immediately when the
> control is set.

Not my field of competence, but won't this cause a flicker ?

Nicolas

>
> Signed-off-by: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>
> ---
>  drivers/media/i2c/imx335.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
> index fcfd1d851bd4..e73a23bbbc89 100644
> --- a/drivers/media/i2c/imx335.c
> +++ b/drivers/media/i2c/imx335.c
> @@ -559,12 +559,12 @@ static int imx335_set_ctrl(struct v4l2_ctrl
> *ctrl)
>   imx335->vblank,
>   imx335->vblank + imx335->cur_mode->height);
>  
> - return __v4l2_ctrl_modify_range(imx335->exp_ctrl,
> - IMX335_EXPOSURE_MIN,
> - imx335->vblank +
> - imx335->cur_mode-
> >height -
> -
> IMX335_EXPOSURE_OFFSET,
> - 1,
> IMX335_EXPOSURE_DEFAULT);
> + __v4l2_ctrl_modify_range(imx335->exp_ctrl,
> +   IMX335_EXPOSURE_MIN,
> +   imx335->vblank +
> +   imx335->cur_mode->height -
> +   IMX335_EXPOSURE_OFFSET,
> +   1,
> IMX335_EXPOSURE_DEFAULT);
>   }
>  
>   /*
> @@ -575,6 +575,13 @@ static int imx335_set_ctrl(struct v4l2_ctrl
> *ctrl)
>   return 0;
>  
>   switch (ctrl->id) {
> + case V4L2_CID_VBLANK:
> + exposure = imx335->exp_ctrl->val;
> + analog_gain = imx335->again_ctrl->val;
> +
> + ret = imx335_update_exp_gain(imx335, exposure,
> analog_gain);
> +
> + break;
>   case V4L2_CID_EXPOSURE:
>   exposure = ctrl->val;
>   analog_gain = imx335->again_ctrl->val;