Re: [PATCH v3 2/2] media: i2c: ov772x: Add test pattern control

Laurent Pinchart
2020-09-04T01:29:19Z

Hi Prabhakar,

Thank you for the patch.

On Mon, Aug 24, 2020 at 08:04:06PM +0100, Lad Prabhakar wrote:
> Add support for test pattern control supported by the sensor.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> drivers/media/i2c/ov772x.c | 25 ++++++++++++++++++++++++-
> include/media/i2c/ov772x.h | 1 +
> 2 files changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> index 67764d647526..f267d8abd742 100644
> --- a/drivers/media/i2c/ov772x.c
> +++ b/drivers/media/i2c/ov772x.c
> @@ -227,7 +227,7 @@
>
> /* COM3 */
> #define SWAP_MASK (SWAP_RGB | SWAP_YUV | SWAP_ML)
> -#define IMG_MASK (VFLIP_IMG | HFLIP_IMG)
> +#define IMG_MASK (VFLIP_IMG | HFLIP_IMG | SCOLOR_TEST)
>
> #define VFLIP_IMG 0x80 /* Vertical flip image ON/OFF selection */
> #define HFLIP_IMG 0x40 /* Horizontal mirror image ON/OFF selection */
> @@ -425,6 +425,7 @@ struct ov772x_priv {
> const struct ov772x_win_size *win;
> struct v4l2_ctrl *vflip_ctrl;
> struct v4l2_ctrl *hflip_ctrl;
> + unsigned int test_pattern;
> /* band_filter = COM8[5] ? 256 - BDBASE : 0 */
> struct v4l2_ctrl *band_filter_ctrl;
> unsigned int fps;
> @@ -540,6 +541,11 @@ static const struct ov772x_win_size ov772x_win_sizes[] = {
> },
> };
>
> +static const char * const ov772x_test_pattern_menu[] = {
> + "Disabled",
> + "Vertical Color Bar Type 1",
> +};
> +
> /*
> * frame rate settings lists
> */
> @@ -762,6 +768,13 @@ static int ov772x_s_frame_interval(struct v4l2_subdev *sd,
> return ret;
> }
>
> +static int ov772x_enable_test_pattern(struct ov772x_priv *priv, u32 pattern)
> +{
> + priv->test_pattern = pattern;
> + return regmap_update_bits(priv->regmap, COM3, SCOLOR_TEST,
> + pattern ? SCOLOR_TEST : 0x00);
> +}
> +
> static int ov772x_s_ctrl(struct v4l2_ctrl *ctrl)
> {
> struct ov772x_priv *priv = container_of(ctrl->handler,
> @@ -809,6 +822,8 @@ static int ov772x_s_ctrl(struct v4l2_ctrl *ctrl)
> }
>
> return ret;
> + case V4L2_CID_TEST_PATTERN:
> + return ov772x_enable_test_pattern(priv, ctrl->val);
> }
>
> return -EINVAL;
> @@ -1103,10 +1118,14 @@ static int ov772x_set_params(struct ov772x_priv *priv,
> val |= VFLIP_IMG;
> if (priv->info && (priv->info->flags & OV772X_FLAG_HFLIP))
> val |= HFLIP_IMG;
> + if (priv->info && (priv->info->flags & OV772X_FLAG_TEST_PATTERN))
> + val |= SCOLOR_TEST;

Why do you need this new flag ? First of all flags are only used on
systems that use platform data, which has been deprecated in favour of
DT for a long time, and then I don't see a need to enable the test
pattern from platform data.

> if (priv->vflip_ctrl->val)
> val ^= VFLIP_IMG;
> if (priv->hflip_ctrl->val)
> val ^= HFLIP_IMG;
> + if (priv->test_pattern)
> + val ^= SCOLOR_TEST;

It would be nice if we could replace the manual handling of controls in
this function by a call to v4l2_ctrl_handler_setup(), but that's a
candidate for a separate patch.

>
> ret = regmap_update_bits(priv->regmap, COM3, SWAP_MASK | IMG_MASK, val);
> if (ret < 0)
> @@ -1404,6 +1423,10 @@ static int ov772x_probe(struct i2c_client *client)
> priv->band_filter_ctrl = v4l2_ctrl_new_std(&priv->hdl, &ov772x_ctrl_ops,
> V4L2_CID_BAND_STOP_FILTER,
> 0, 256, 1, 0);
> + v4l2_ctrl_new_std_menu_items(&priv->hdl, &ov772x_ctrl_ops,
> + V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(ov772x_test_pattern_menu) - 1,
> + 0, 0, ov772x_test_pattern_menu);
> priv->subdev.ctrl_handler = &priv->hdl;
> if (priv->hdl.error) {
> ret = priv->hdl.error;
> diff --git a/include/media/i2c/ov772x.h b/include/media/i2c/ov772x.h
> index a1702d420087..65e6f8d2f4bb 100644
> --- a/include/media/i2c/ov772x.h
> +++ b/include/media/i2c/ov772x.h
> @@ -12,6 +12,7 @@
> /* for flags */
> #define OV772X_FLAG_VFLIP (1 << 0) /* Vertical flip image */
> #define OV772X_FLAG_HFLIP (1 << 1) /* Horizontal flip image */
> +#define OV772X_FLAG_TEST_PATTERN (1 << 2) /* Test pattern */
>
> /*
> * for Edge ctrl

--
Regards,

Laurent Pinchart