linux-kernel - Re: [PATCH v2 08/11] media: i2c: ov5645: Switch to {enable,disable}

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Message-ID: <20240924225515.GQ7165@pendragon.ideasonboard.com>
Date: Wed, 25 Sep 2024 01:55:15 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Kieran Bingham <kieran.bingham@...asonboard.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Jacopo Mondi <jacopo.mondi@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 08/11] media: i2c: ov5645: Switch to
 {enable,disable}_streams

Hi Prabhakar,

Thank you for the patch.

On Tue, Sep 10, 2024 at 06:06:07PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Switch from s_stream to enable_streams and disable_streams callbacks.

Here too you should explain why. The "why" is the most important part of
any commit message.

> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

> ---
>  drivers/media/i2c/ov5645.c | 90 +++++++++++++++++++-------------------
>  1 file changed, 46 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index 9497ec737cb7..dc93514608ee 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -923,71 +923,71 @@ static int ov5645_get_selection(struct v4l2_subdev *sd,
>  	return 0;
>  }
>  
> -static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> +static int ov5645_enable_streams(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *state, u32 pad,
> +				 u64 streams_mask)
>  {
> -	struct ov5645 *ov5645 = to_ov5645(subdev);
> -	struct v4l2_subdev_state *state;
> +	struct ov5645 *ov5645 = to_ov5645(sd);
>  	int ret;
>  
> -	state = v4l2_subdev_lock_and_get_active_state(&ov5645->sd);
> -
> -	if (enable) {
> -		ret = pm_runtime_resume_and_get(ov5645->dev);
> -		if (ret < 0) {
> -			v4l2_subdev_unlock_state(state);
> -			return ret;
> -		}
> +	ret = pm_runtime_resume_and_get(ov5645->dev);
> +	if (ret < 0)
> +		return ret;
>  
> -		ret = ov5645_set_register_array(ov5645,
> +	ret = ov5645_set_register_array(ov5645,
>  					ov5645->current_mode->data,
>  					ov5645->current_mode->data_size);
> -		if (ret < 0) {
> -			dev_err(ov5645->dev, "could not set mode %dx%d\n",
> -				ov5645->current_mode->width,
> -				ov5645->current_mode->height);
> -			goto err_rpm_put;
> -		}
> -		ret = __v4l2_ctrl_handler_setup(&ov5645->ctrls);
> -		if (ret < 0) {
> -			dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> -			goto err_rpm_put;
> -		}
> -
> -		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
> -		if (ret < 0)
> -			goto err_rpm_put;
> -
> -		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> -				       OV5645_SYSTEM_CTRL0_START);
> -		if (ret < 0)
> -			goto err_rpm_put;
> -	} else {
> -		ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> -		if (ret < 0)
> -			goto stream_off_rpm_put;
> +	if (ret < 0) {
> +		dev_err(ov5645->dev, "could not set mode %dx%d\n",
> +			ov5645->current_mode->width,
> +			ov5645->current_mode->height);
> +		goto err_rpm_put;
> +	}
> +	ret = __v4l2_ctrl_handler_setup(&ov5645->ctrls);
> +	if (ret < 0) {
> +		dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> +		goto err_rpm_put;
> +	}
>  
> -		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> -				       OV5645_SYSTEM_CTRL0_STOP);
> +	ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x45);
> +	if (ret < 0)
> +		goto err_rpm_put;
>  
> -		goto stream_off_rpm_put;
> -	}
> +	ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> +			       OV5645_SYSTEM_CTRL0_START);
> +	if (ret < 0)
> +		goto err_rpm_put;
>  
> -	v4l2_subdev_unlock_state(state);
>  	return 0;
>  
>  err_rpm_put:
>  	pm_runtime_put_sync(ov5645->dev);
>  	return ret;
> +}
> +
> +static int ov5645_disable_streams(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_state *state, u32 pad,
> +				  u64 streams_mask)
> +{
> +	struct ov5645 *ov5645 = to_ov5645(sd);
> +	int ret;
> +
> +	ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
> +	if (ret < 0)
> +		goto rpm_put;
> +
> +	ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> +			       OV5645_SYSTEM_CTRL0_STOP);
>  
> -stream_off_rpm_put:
> +rpm_put:
>  	pm_runtime_mark_last_busy(ov5645->dev);
>  	pm_runtime_put_autosuspend(ov5645->dev);
> -	v4l2_subdev_unlock_state(state);
> +
>  	return ret;
>  }
>  
>  static const struct v4l2_subdev_video_ops ov5645_video_ops = {
> -	.s_stream = ov5645_s_stream,
> +	.s_stream = v4l2_subdev_s_stream_helper,
>  };
>  
>  static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
> @@ -996,6 +996,8 @@ static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
>  	.get_fmt = v4l2_subdev_get_fmt,
>  	.set_fmt = ov5645_set_format,
>  	.get_selection = ov5645_get_selection,
> +	.enable_streams = ov5645_enable_streams,
> +	.disable_streams = ov5645_disable_streams,
>  };
>  
>  static const struct v4l2_subdev_core_ops ov5645_core_ops = {

-- 
Regards,

Laurent Pinchart