linux-kernel - Re: [PATCH v3 1/2] media: i2c: imx219: switch to {enable,disable}

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Message-ID: <Z8hjy8CiM-QcjTME@kekkonen.localdomain>
Date: Wed, 5 Mar 2025 14:46:35 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tarang Raval <tarang.raval@...iconsignals.io>
Cc: kieran.bingham@...asonboard.com,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] media: i2c: imx219: switch to
 {enable,disable}_streams

Hi Tarang,

Thanks for the update.

On Wed, Mar 05, 2025 at 07:51:15PM +0530, Tarang Raval wrote:
> Switch from s_stream to enable_streams and disable_streams callbacks.
> 
> Signed-off-by: Tarang Raval <tarang.raval@...iconsignals.io>
> ---
>  drivers/media/i2c/imx219.c | 36 +++++++++++++++++-------------------
>  1 file changed, 17 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index f662c9d75511..12f1aa8824fe 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -723,12 +723,17 @@ static int imx219_configure_lanes(struct imx219 *imx219)
>  				  ARRAY_SIZE(imx219_4lane_regs), NULL);
>  };
>  
> -static int imx219_start_streaming(struct imx219 *imx219,
> -				  struct v4l2_subdev_state *state)
> +static int imx219_enable_streams(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *state, u32 pad,
> +				 u64 streams_mask)
>  {
> +	struct imx219 *imx219 = to_imx219(sd);
>  	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
>  	int ret;
>  
> +	if (pad != 0)
> +		return -EINVAL;

There's no need to check for the pad argument: {enable,disable}_streams may
be called on source pads only.

> +
>  	ret = pm_runtime_resume_and_get(&client->dev);
>  	if (ret < 0)
>  		return ret;
> @@ -778,11 +783,17 @@ static int imx219_start_streaming(struct imx219 *imx219,
>  	return ret;
>  }
>  
> -static void imx219_stop_streaming(struct imx219 *imx219)
> +static int imx219_disable_streams(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_state *state, u32 pad,
> +				  u64 streams_mask)
>  {
> +	struct imx219 *imx219 = to_imx219(sd);
>  	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
>  	int ret;
>  
> +	if (pad != 0)
> +		return -EINVAL;

Ditto.

> +
>  	/* set stream off register */
>  	ret = cci_write(imx219->regmap, IMX219_REG_MODE_SELECT,
>  			IMX219_MODE_STANDBY, NULL);
> @@ -793,22 +804,7 @@ static void imx219_stop_streaming(struct imx219 *imx219)
>  	__v4l2_ctrl_grab(imx219->hflip, false);
>  
>  	pm_runtime_put(&client->dev);
> -}
> -
> -static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
> -{
> -	struct imx219 *imx219 = to_imx219(sd);
> -	struct v4l2_subdev_state *state;
> -	int ret = 0;
> -
> -	state = v4l2_subdev_lock_and_get_active_state(sd);
> -
> -	if (enable)
> -		ret = imx219_start_streaming(imx219, state);
> -	else
> -		imx219_stop_streaming(imx219);
>  
> -	v4l2_subdev_unlock_state(state);
>  	return ret;
>  }
>  
> @@ -992,7 +988,7 @@ static int imx219_init_state(struct v4l2_subdev *sd,
>  }
>  
>  static const struct v4l2_subdev_video_ops imx219_video_ops = {
> -	.s_stream = imx219_set_stream,
> +	.s_stream = v4l2_subdev_s_stream_helper,
>  };
>  
>  static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
> @@ -1001,6 +997,8 @@ static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
>  	.set_fmt = imx219_set_pad_format,
>  	.get_selection = imx219_get_selection,
>  	.enum_frame_size = imx219_enum_frame_size,
> +	.enable_streams = imx219_enable_streams,
> +	.disable_streams = imx219_disable_streams,
>  };
>  
>  static const struct v4l2_subdev_ops imx219_subdev_ops = {

-- 
Regards,

Sakari Ailus