Re: [PATCH v2] media: i2c: ov9282: Add test pattern control

[Sakari Ailus]

Hi Xiaolei,

Thanks for the update.

On Wed, Mar 18, 2026 at 01:16:18PM +0800, Xiaolei Wang wrote:
> Add V4L2_CID_TEST_PATTERN control with bar and solid white patterns.
> Since the OV9282 is a monochrome sensor, white is more useful than
> black for solid pattern testing.
> 
> Signed-off-by: Xiaolei Wang <xiaolei.wang@xxxxxxxxxxxxx>
> ---
> 
> Changes in v2:
>  - Rename to "Bar" / "Solid White" since OV9282 is a monochrome
>    sensor (Dave)
>  - Use cci_write instead of cci_update_bits (Dave)
>  - Default solid pattern to white (Dave)
>  Link to v1: https://patchwork.linuxtv.org/project/linux-media/patch/20260316090558.1537823-1-xiaolei.wang@xxxxxxxxxxxxx/
> 
>  drivers/media/i2c/ov9282.c | 61 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 60 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
> index 2167fb73ea41..85f612e7ab28 100644
> --- a/drivers/media/i2c/ov9282.c
> +++ b/drivers/media/i2c/ov9282.c
> @@ -104,6 +104,17 @@
>  #define OV9282_REG_STROBE_FRAME_SPAN		CCI_REG32(0x3925)
>  #define OV9282_STROBE_FRAME_SPAN_DEFAULT	0x0000001a
>  
> +/* Test Pattern registers */
> +#define OV9282_REG_TEST_PATTERN_BAR	CCI_REG8(0x5e00)
> +#define OV9282_TEST_PATTERN_BAR_EN	BIT(7)
> +#define OV9282_REG_TEST_PATTERN_SOLID	CCI_REG8(0x4320)
> +#define OV9282_TEST_PATTERN_SOLID_EN	BIT(1)
> +#define OV9282_TEST_PATTERN_SOLID_DEFAULT	0x80
> +#define OV9282_REG_SOLID_P1		CCI_REG16(0x4322)
> +#define OV9282_REG_SOLID_P2		CCI_REG16(0x4324)
> +#define OV9282_REG_SOLID_P3		CCI_REG16(0x4328)
> +#define OV9282_REG_SOLID_P4		CCI_REG16(0x4326)
> +
>  /* Input clock rate */
>  #define OV9282_INCLK_RATE	24000000
>  
> @@ -462,6 +473,18 @@ static const struct ov9282_mode supported_modes[] = {
>  	},
>  };
>  
> +enum {
> +	OV9282_TEST_PATTERN_DISABLED,
> +	OV9282_TEST_PATTERN_BAR,
> +	OV9282_TEST_PATTERN_SOLID_WHITE,
> +};
> +
> +static const char * const ov9282_test_pattern_menu[] = {
> +	"Disabled",
> +	"Bar",
> +	"Solid White",
> +};
> +
>  /**
>   * to_ov9282() - ov9282 V4L2 sub-device to ov9282 device.
>   * @subdev: pointer to ov9282 V4L2 sub-device
> @@ -586,6 +609,32 @@ static u32 ov9282_flash_duration_to_us(struct ov9282 *ov9282, u32 value)
>  	return DIV_ROUND_UP(value * frame_width, OV9282_STROBE_SPAN_FACTOR);
>  }
>  
> +static int ov9282_set_ctrl_test_pattern(struct ov9282 *ov9282, int pattern)
> +{
> +	int ret;
> +
> +	ret = cci_write(ov9282->regmap, OV9282_REG_TEST_PATTERN_BAR,
> +			pattern == OV9282_TEST_PATTERN_BAR ?
> +			OV9282_TEST_PATTERN_BAR_EN : 0, NULL);
> +	if (ret)
> +		return ret;
> +
> +	if (pattern == OV9282_TEST_PATTERN_SOLID_WHITE) {
> +		/* Set all four pixel values to 0x3ff (white) */
> +		cci_write(ov9282->regmap, OV9282_REG_SOLID_P1, 0x3ff, &ret);
> +		cci_write(ov9282->regmap, OV9282_REG_SOLID_P2, 0x3ff, &ret);
> +		cci_write(ov9282->regmap, OV9282_REG_SOLID_P3, 0x3ff, &ret);
> +		cci_write(ov9282->regmap, OV9282_REG_SOLID_P4, 0x3ff, &ret);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return cci_write(ov9282->regmap, OV9282_REG_TEST_PATTERN_SOLID,
> +			 pattern == OV9282_TEST_PATTERN_SOLID_WHITE ?
> +			 OV9282_TEST_PATTERN_SOLID_DEFAULT | OV9282_TEST_PATTERN_SOLID_EN :
> +			 OV9282_TEST_PATTERN_SOLID_DEFAULT, NULL);

As OV9282_TEST_PATTERN_SOLID_DEFAULT isn't conditional, you can keep it out
of the ternary operator.

> +}
> +
>  /**
>   * ov9282_set_ctrl() - Set subdevice control
>   * @ctrl: pointer to v4l2_ctrl structure
> @@ -662,6 +711,11 @@ static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl)
>  	case V4L2_CID_FLASH_DURATION:
>  		ret = cci_write(ov9282->regmap, OV9282_REG_STROBE_FRAME_SPAN, ctrl->val, NULL);
>  		break;
> +
> +	case V4L2_CID_TEST_PATTERN:
> +		ret = ov9282_set_ctrl_test_pattern(ov9282, ctrl->val);
> +		break;
> +
>  	default:
>  		dev_err(ov9282->dev, "Invalid control %d", ctrl->id);
>  		ret = -EINVAL;
> @@ -1242,7 +1296,7 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
>  	u32 lpfr;
>  	int ret;
>  
> -	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 12);
> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 13);
>  	if (ret)
>  		return ret;
>  
> @@ -1314,6 +1368,11 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
>  				  V4L2_CID_FLASH_DURATION, 0, exposure_us, 1,
>  				  OV9282_STROBE_FRAME_SPAN_DEFAULT);
>  
> +	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &ov9282_ctrl_ops,
> +				     V4L2_CID_TEST_PATTERN,
> +				     ARRAY_SIZE(ov9282_test_pattern_menu) - 1,
> +				     0, 0, ov9282_test_pattern_menu);
> +
>  	ret = v4l2_fwnode_device_parse(ov9282->dev, &props);
>  	if (!ret) {
>  		/* Failure sets ctrl_hdlr->error, which we check afterwards anyway */

-- 
Regards,

Sakari Ailus