linux-kernel - Re: [PATCH v2 15/16] media: i2c: ov5647: Tidy up PIXEL

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Message-ID: <CAPY8ntCGnTNk4Bk5+QRV45jD7nfqZOToZ260YwfbvTQEJR7DFw@mail.gmail.com>
Date: Mon, 1 Dec 2025 18:14:47 +0000
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Jai Luthra <jai.luthra@...asonboard.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>, Jacopo Mondi <jacopo@...ndi.org>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Naushir Patuck <naush@...pberrypi.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, Mauro Carvalho Chehab <mchehab+huawei@...nel.org>, 
	Kieran Bingham <kieran.bingham@...asonboard.com>, 
	David Plowman <david.plowman@...pberrypi.com>, 
	Laurent Pinchart <laurent.pinchart@...asonboard.com>, Peter Robinson <pbrobinson@...il.com>, 
	Stefan Wahren <wahrenst@....net>, "Ivan T. Ivanov" <iivanov@...e.de>, 
	Jacopo Mondi <jacopo.mondi@...asonboard.com>
Subject: Re: [PATCH v2 15/16] media: i2c: ov5647: Tidy up PIXEL_RATE control

Hi Jai

On Tue, 18 Nov 2025 at 12:04, Jai Luthra <jai.luthra@...asonboard.com> wrote:
>
> The pixel rate control is marked as read-only by the framework itself,
> so no need to mark it explicitly in the driver. Also, we can set the ops
> to NULL to avoid checking for it in the s_ctrl implementation.
>
> Suggested-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
> Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

> ---
>  drivers/media/i2c/ov5647.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> index 3a2c25a6b6808bf1289a2357ac5b79bf6bf99daa..71107d74f2900b39233a52b29a229282bd087963 100644
> --- a/drivers/media/i2c/ov5647.c
> +++ b/drivers/media/i2c/ov5647.c
> @@ -1195,12 +1195,6 @@ static int ov5647_s_ctrl(struct v4l2_ctrl *ctrl)
>                 ret = ov5647_write(sd, OV5647_REG_ISPCTRL3D,
>                                    ov5647_test_pattern_val[ctrl->val]);
>                 break;
> -
> -       /* Read-only, but we adjust it based on mode. */
> -       case V4L2_CID_PIXEL_RATE:
> -               /* Read-only, but we adjust it based on mode. */
> -               break;
> -
>         case V4L2_CID_HFLIP:
>                 /* There's an in-built hflip in the sensor, so account for that here. */
>                 ov5647_s_flip(sd, OV5647_REG_TIMING_TC_H, !ctrl->val);
> @@ -1267,7 +1261,7 @@ static int ov5647_init_controls(struct ov5647 *sensor)
>                           V4L2_CID_ANALOGUE_GAIN, 16, 1023, 1, 32);
>
>         /* By default, PIXEL_RATE is read only, but it does change per mode */
> -       sensor->pixel_rate = v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
> +       sensor->pixel_rate = v4l2_ctrl_new_std(&sensor->ctrls, NULL,
>                                                V4L2_CID_PIXEL_RATE,
>                                                sensor->mode->pixel_rate,
>                                                sensor->mode->pixel_rate, 1,
> @@ -1306,7 +1300,6 @@ static int ov5647_init_controls(struct ov5647 *sensor)
>         if (sensor->ctrls.error)
>                 goto handler_free;
>
> -       sensor->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>         sensor->sd.ctrl_handler = &sensor->ctrls;
>
>         return 0;
>
> --
> 2.51.1
>