linux-kernel - Re: [PATCH] media: i2c: imx334: add support for test pattern generator

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Date:   Fri, 4 Aug 2023 11:49:16 +0000
From:   Sakari Ailus <sakari.ailus@....fi>
To:     shravan kumar <shravan.chippa@...rochip.com>
Cc:     paul.j.murphy@...el.com, daniele.alessandrelli@...el.com,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: imx334: add support for test pattern
 generator

Hi Shravan,

On Mon, Jul 10, 2023 at 03:21:11PM +0530, shravan kumar wrote:
> From: Shravan Chippa <shravan.chippa@...rochip.com>
> 
> Add support for the imx334's test pattern generator.
> By default the test pattern generator is disabled, so add support for
> enabling and disabling horizontal and vertical colour bars.
> 
> Signed-off-by: Shravan Chippa <shravan.chippa@...rochip.com>
> ---
>  drivers/media/i2c/imx334.c | 57 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
> index b65c526a5f1c..248ab65a6725 100644
> --- a/drivers/media/i2c/imx334.c
> +++ b/drivers/media/i2c/imx334.c
> @@ -56,6 +56,24 @@
>  #define IMX334_REG_MIN		0x00
>  #define IMX334_REG_MAX		0xfffff
>  
> +/* Test Pattern Control */
> +#define IMX334_REG_TP		0x329e
> +#define IMX334_TP_COLOR_HBARS	0xA
> +#define IMX334_TP_COLOR_VBARS	0xB
> +
> +#define IMX334_TPG_EN_DOUT	0x329c
> +#define IMX334_TP_ENABLE	0x1
> +#define IMX334_TP_DISABLE	0x0
> +
> +#define IMX334_TPG_COLORW	0x32a0
> +#define IMX334_TPG_COLORW_120P	0x13
> +
> +#define IMX334_TP_CLK_EN	0x3148
> +#define IMX334_TP_CLK_EN_VAL	0x10
> +#define IMX334_TP_CLK_DIS_VAL	0x0
> +
> +#define IMX334_DIG_CLP_MODE	0x3280
> +
>  /**
>   * struct imx334_reg - imx334 sensor register
>   * @address: Register address
> @@ -429,6 +447,18 @@ static const struct imx334_reg mode_3840x2160_regs[] = {
>  	{0x3a29, 0x00},
>  };
>  
> +static const char * const imx334_test_pattern_menu[] = {
> +	"Disabled",
> +	"Color Bars Ver",
> +	"Color Bars Hor",

I'd try to align this with what's already there.

E.g. "Vertical Color Bars" and "Horizontal Color Bars".

Seems fine otherwise. Please cc me for v2.

> +};
> +
> +static const int imx334_test_pattern_val[] = {
> +	IMX334_TP_DISABLE,
> +	IMX334_TP_COLOR_HBARS,
> +	IMX334_TP_COLOR_VBARS,
> +};
> +
>  static const struct imx334_reg raw10_framefmt_regs[] = {
>  	{0x3050, 0x00},
>  	{0x319d, 0x00},
> @@ -711,6 +741,26 @@ static int imx334_set_ctrl(struct v4l2_ctrl *ctrl)
>  	case V4L2_CID_HBLANK:
>  		ret = 0;
>  		break;
> +	case V4L2_CID_TEST_PATTERN:
> +		if (ctrl->val) {
> +			imx334_write_reg(imx334, IMX334_TP_CLK_EN, 1,
> +					 IMX334_TP_CLK_EN_VAL);
> +			imx334_write_reg(imx334, IMX334_DIG_CLP_MODE, 1, 0x0);
> +			imx334_write_reg(imx334, IMX334_TPG_COLORW, 1,
> +					 IMX334_TPG_COLORW_120P);
> +			imx334_write_reg(imx334, IMX334_REG_TP, 1,
> +					 imx334_test_pattern_val[ctrl->val]);
> +			imx334_write_reg(imx334, IMX334_TPG_EN_DOUT, 1,
> +					 IMX334_TP_ENABLE);
> +		} else {
> +			imx334_write_reg(imx334, IMX334_DIG_CLP_MODE, 1, 0x1);
> +			imx334_write_reg(imx334, IMX334_TP_CLK_EN, 1,
> +					 IMX334_TP_CLK_DIS_VAL);
> +			imx334_write_reg(imx334, IMX334_TPG_EN_DOUT, 1,
> +					 IMX334_TP_DISABLE);
> +		}
> +		ret = 0;
> +		break;
>  	default:
>  		dev_err(imx334->dev, "Invalid control %d", ctrl->id);
>  		ret = -EINVAL;
> @@ -1217,7 +1267,7 @@ static int imx334_init_controls(struct imx334 *imx334)
>  	u32 lpfr;
>  	int ret;
>  
> -	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 6);
> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 7);
>  	if (ret)
>  		return ret;
>  
> @@ -1277,6 +1327,11 @@ static int imx334_init_controls(struct imx334 *imx334)
>  	if (imx334->hblank_ctrl)
>  		imx334->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>  
> +	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx334_ctrl_ops,
> +				     V4L2_CID_TEST_PATTERN,
> +				     ARRAY_SIZE(imx334_test_pattern_menu) - 1,
> +				     0, 0, imx334_test_pattern_menu);
> +
>  	if (ctrl_hdlr->error) {
>  		dev_err(imx334->dev, "control init failed: %d",
>  			ctrl_hdlr->error);
> -- 
> 2.34.1
> 

-- 
Kind regards,

Sakari Ailus