linux-kernel - Re: [PATCH v3 19/20] media: i2c: ov4689: Refactor ov4689_s

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Message-ID: <20240304213103.GA3239@pendragon.ideasonboard.com>
Date: Mon, 4 Mar 2024 23:31:03 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Mikhail Rudenko <mike.rudenko@...il.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Jacopo Mondi <jacopo@...ndi.org>,
	Tommaso Merciai <tomm.merciai@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH v3 19/20] media: i2c: ov4689: Refactor ov4689_s_stream

Hi Mikhail,

Thank you for the patch.

On Thu, Feb 29, 2024 at 07:53:32PM +0300, Mikhail Rudenko wrote:
> Split ov4689_s_stream into __ov4689_stream_on and __ov4689_stream_off
> functions. Also remove repetitive pm_runtime_put calls and call
> pm_runtime_put once at the end of the __ov4689_stream_off function if
> any error occurred.
> 
> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
> ---
>  drivers/media/i2c/ov4689.c | 100 ++++++++++++++++++++-----------------
>  1 file changed, 53 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> index 2496067b90a0..5cea9b5ba201 100644
> --- a/drivers/media/i2c/ov4689.c
> +++ b/drivers/media/i2c/ov4689.c
> @@ -537,61 +537,67 @@ static int ov4689_setup_blc_anchors(struct ov4689 *ov4689,
>  	return ret;
>  }
>  
> +static int __ov4689_stream_on(struct ov4689 *ov4689,

No need for the __ prefix. Same for __ov4689_stream_off().

> +			      struct v4l2_subdev_state *sd_state)
> +{
> +	int ret;
> +
> +	ret = pm_runtime_resume_and_get(ov4689->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = cci_multi_reg_write(ov4689->regmap, ov4689_common_regs,
> +				  ARRAY_SIZE(ov4689_common_regs), NULL);
> +	if (ret)
> +		goto cleanup_pm;
> +
> +	ret = ov4689_setup_timings(ov4689, sd_state);
> +	if (ret)
> +		goto cleanup_pm;
> +
> +	ret = ov4689_setup_blc_anchors(ov4689, sd_state);
> +	if (ret)
> +		goto cleanup_pm;
> +
> +	ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
> +	if (ret)
> +		goto cleanup_pm;
> +
> +	ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
> +			OV4689_MODE_STREAMING, NULL);
> +	if (ret)
> +		goto cleanup_pm;
> +
> +	return 0;
> +
> + cleanup_pm:

No space before the label. I would also name it just "error".

With those small changes,

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

> +	pm_runtime_put(ov4689->dev);
> +	return ret;
> +}
> +
> +static int __ov4689_stream_off(struct ov4689 *ov4689)
> +{
> +	cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE, OV4689_MODE_SW_STANDBY,
> +		  NULL);
> +	pm_runtime_mark_last_busy(ov4689->dev);
> +	pm_runtime_put_autosuspend(ov4689->dev);
> +
> +	return 0;
> +}
> +
>  static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
>  {
>  	struct ov4689 *ov4689 = to_ov4689(sd);
>  	struct v4l2_subdev_state *sd_state;
> -	struct device *dev = ov4689->dev;
> -	int ret = 0;
> +	int ret;
>  
>  	sd_state = v4l2_subdev_lock_and_get_active_state(&ov4689->subdev);
>  
> -	if (on) {
> -		ret = pm_runtime_resume_and_get(dev);
> -		if (ret < 0)
> -			goto unlock_and_return;
> -
> -		ret = cci_multi_reg_write(ov4689->regmap,
> -					  ov4689_common_regs,
> -					  ARRAY_SIZE(ov4689_common_regs),
> -					  NULL);
> -		if (ret) {
> -			pm_runtime_put(dev);
> -			goto unlock_and_return;
> -		}
> -
> -		ret = ov4689_setup_timings(ov4689, sd_state);
> -		if (ret) {
> -			pm_runtime_put(dev);
> -			goto unlock_and_return;
> -		}
> -
> -		ret = ov4689_setup_blc_anchors(ov4689, sd_state);
> -		if (ret) {
> -			pm_runtime_put(dev);
> -			goto unlock_and_return;
> -		}
> -
> -		ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
> -		if (ret) {
> -			pm_runtime_put(dev);
> -			goto unlock_and_return;
> -		}
> -
> -		ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
> -				OV4689_MODE_STREAMING, NULL);
> -		if (ret) {
> -			pm_runtime_put(dev);
> -			goto unlock_and_return;
> -		}
> -	} else {
> -		cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
> -			  OV4689_MODE_SW_STANDBY, NULL);
> -		pm_runtime_mark_last_busy(dev);
> -		pm_runtime_put_autosuspend(dev);
> -	}
> +	if (on)
> +		ret = __ov4689_stream_on(ov4689, sd_state);
> +	else
> +		ret = __ov4689_stream_off(ov4689);
>  
> -unlock_and_return:
>  	v4l2_subdev_unlock_state(sd_state);
>  
>  	return ret;

-- 
Regards,

Laurent Pinchart