linux-kernel - Re: [PATCH v2 14/20] media: i2c: ov4689: Implement manual color balance controls

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Date: Fri, 23 Feb 2024 13:31:11 +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 v2 14/20] media: i2c: ov4689: Implement manual color
 balance controls

Hi Mikhail,

Thank you for the patch.

On Mon, Dec 18, 2023 at 08:40:35PM +0300, Mikhail Rudenko wrote:
> The OV4689 sensor has separate red and blue gain settings (up to 4x).
> Implement appropriate controls in the driver. Default gain values
> are not modified.
> 
> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>

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

> ---
>  drivers/media/i2c/ov4689.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> index 579362570ba4..b43fb1d7b15f 100644
> --- a/drivers/media/i2c/ov4689.c
> +++ b/drivers/media/i2c/ov4689.c
> @@ -56,6 +56,13 @@
>  #define OV4689_TIMING_FLIP_BOTH		(OV4689_TIMING_FLIP_ARRAY |\
>  					 OV4689_TIMING_FLIP_DIGITAL)
>  
> +#define OV4689_REG_WB_GAIN_RED		CCI_REG16(0x500c)
> +#define OV4689_REG_WB_GAIN_BLUE		CCI_REG16(0x5010)
> +#define OV4689_WB_GAIN_MIN		1
> +#define OV4689_WB_GAIN_MAX		0xfff
> +#define OV4689_WB_GAIN_STEP		1
> +#define OV4689_WB_GAIN_DEFAULT		0x400
> +
>  #define OV4689_REG_TEST_PATTERN		CCI_REG8(0x5040)
>  #define OV4689_TEST_PATTERN_ENABLE	0x80
>  #define OV4689_TEST_PATTERN_DISABLE	0x0
> @@ -632,6 +639,12 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>  	case V4L2_CID_DIGITAL_GAIN:
>  		cci_write(regmap, OV4689_REG_DIG_GAIN, ctrl->val, &ret);
>  		break;
> +	case V4L2_CID_RED_BALANCE:
> +		cci_write(regmap, OV4689_REG_WB_GAIN_RED, ctrl->val, &ret);
> +		break;
> +	case V4L2_CID_BLUE_BALANCE:
> +		cci_write(regmap, OV4689_REG_WB_GAIN_BLUE, ctrl->val, &ret);
> +		break;
>  	default:
>  		dev_warn(dev, "%s Unhandled id:0x%x, val:0x%x\n",
>  			 __func__, ctrl->id, ctrl->val);
> @@ -662,7 +675,7 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
>  
>  	handler = &ov4689->ctrl_handler;
>  	mode = ov4689->cur_mode;
> -	ret = v4l2_ctrl_handler_init(handler, 13);
> +	ret = v4l2_ctrl_handler_init(handler, 15);
>  	if (ret)
>  		return ret;
>  
> @@ -709,6 +722,14 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
>  			  OV4689_DIG_GAIN_MIN, OV4689_DIG_GAIN_MAX,
>  			  OV4689_DIG_GAIN_STEP, OV4689_DIG_GAIN_DEFAULT);
>  
> +	v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_RED_BALANCE,
> +			  OV4689_WB_GAIN_MIN, OV4689_WB_GAIN_MAX,
> +			  OV4689_WB_GAIN_STEP, OV4689_WB_GAIN_DEFAULT);
> +
> +	v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_BLUE_BALANCE,
> +			  OV4689_WB_GAIN_MIN, OV4689_WB_GAIN_MAX,
> +			  OV4689_WB_GAIN_STEP, OV4689_WB_GAIN_DEFAULT);
> +
>  	if (handler->error) {
>  		ret = handler->error;
>  		dev_err(ov4689->dev, "Failed to init controls(%d)\n", ret);

-- 
Regards,

Laurent Pinchart