linux-kernel - Re: [PATCH 4/6] media: imx335: Update HBLANK range on mode change

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Message-ID: <175508054445.560048.732077947659016819@ping.linuxembedded.co.uk>
Date: Wed, 13 Aug 2025 11:22:24 +0100
From: Kieran Bingham <kieran.bingham@...asonboard.com>
To: Jai Luthra <jai.luthra@...asonboard.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, Jai Luthra <jai.luthra@...asonboard.com>
Subject: Re: [PATCH 4/6] media: imx335: Update HBLANK range on mode change

Quoting Jai Luthra (2025-08-13 08:20:35)
> While switching modes, updating to a different value of HBLANK isn't
> sufficient, as this is a read-only control with a single allowed value,
> and thus hblank_min == hblank_max == hblank of the default mode.
> 
> So to correctly update the user-facing value of the HBLANK parameter,
> which is necessary for correct framerate calculation, update the whole
> range when switching modes.
> 

Seems reasonable to me.


Reviewed-by: Kieran Bingham <kieran.bingham@...asonboard.com>

> Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
> ---
>  drivers/media/i2c/imx335.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
> index dbf2db4bf9cbfd792ff5865264c6f465eb79a43b..c61a6952f828fd8b945746ae2f53f5517e98c410 100644
> --- a/drivers/media/i2c/imx335.c
> +++ b/drivers/media/i2c/imx335.c
> @@ -485,7 +485,8 @@ static int imx335_update_controls(struct imx335 *imx335,
>         if (ret)
>                 return ret;
>  
> -       ret = __v4l2_ctrl_s_ctrl(imx335->hblank_ctrl, mode->hblank);
> +       ret = __v4l2_ctrl_modify_range(imx335->hblank_ctrl, mode->hblank,
> +                                      mode->hblank, 1, mode->hblank);
>         if (ret)
>                 return ret;
>  
> 
> -- 
> 2.50.1
>