linux-kernel - Re: [PATCH v2 06/20] media: i2c: ov4689: Refactor ov4689_set

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Date: Mon, 8 Jan 2024 11:16:07 +0000
From: Sakari Ailus <sakari.ailus@....fi>
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>,
	Laurent Pinchart <laurent.pinchart@...asonboard.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 v2 06/20] media: i2c: ov4689: Refactor ov4689_set_ctrl

Hi Mikhail,

On Mon, Dec 18, 2023 at 08:40:27PM +0300, Mikhail Rudenko wrote:
> Introduce local variable for regmap within the ov4689_set_ctrl
> function. This adjustment eliminates repetition within the function.
> 
> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
> ---
>  drivers/media/i2c/ov4689.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> index 3b20eba59c9c..d42f5d1a1ba8 100644
> --- a/drivers/media/i2c/ov4689.c
> +++ b/drivers/media/i2c/ov4689.c
> @@ -580,6 +580,7 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>  {
>  	struct ov4689 *ov4689 =
>  		container_of(ctrl->handler, struct ov4689, ctrl_handler);
> +	struct regmap *regmap = ov4689->regmap;
>  	struct device *dev = ov4689->dev;
>  	int sensor_gain;
>  	s64 max_expo;
> @@ -603,16 +604,15 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>  	switch (ctrl->id) {
>  	case V4L2_CID_EXPOSURE:
>  		/* 4 least significant bits of exposure are fractional part */
> -		ret = cci_write(ov4689->regmap, OV4689_REG_EXPOSURE,
> -				ctrl->val << 4, NULL);
> +		cci_write(regmap, OV4689_REG_EXPOSURE, ctrl->val << 4, &ret);

If you do this, ret needs to have been initialised to 0, but it isn't.

Same for the changes below.

>  		break;
>  	case V4L2_CID_ANALOGUE_GAIN:
>  		ret = ov4689_map_gain(ov4689, ctrl->val, &sensor_gain);
> -		cci_write(ov4689->regmap, OV4689_REG_GAIN, sensor_gain, &ret);
> +		cci_write(regmap, OV4689_REG_GAIN, sensor_gain, &ret);
>  		break;
>  	case V4L2_CID_VBLANK:
> -		ret = cci_write(ov4689->regmap, OV4689_REG_VTS,
> -				ctrl->val + ov4689->cur_mode->height, NULL);
> +		cci_write(regmap, OV4689_REG_VTS,
> +			  ctrl->val + ov4689->cur_mode->height, &ret);
>  		break;
>  	case V4L2_CID_TEST_PATTERN:
>  		ret = ov4689_enable_test_pattern(ov4689, ctrl->val);
> @@ -625,7 +625,6 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>  	}
>  
>  	pm_runtime_put(dev);
> -

I thought it was nice.

>  	return ret;
>  }
>  

-- 
Regards,

Sakari Ailus