linux-kernel - Re: [PATCH 4/4] media: i2c: ov2685: Add .get

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Message-ID: <20230129112927.jyx3c2hxkhwvqmyq@uno.localdomain>
Date:   Sun, 29 Jan 2023 12:29:27 +0100
From:   Jacopo Mondi <jacopo.mondi@...asonboard.com>
To:     Luca Weiss <luca@...tu.xyz>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jacopo Mondi <jacopo.mondi@...asonboard.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] media: i2c: ov2685: Add .get_selection() support

Hi Luca

On Sun, Jan 29, 2023 at 10:42:38AM +0100, Luca Weiss wrote:
> Add support for the .get_selection() pad operation to the ov2685 sensor
> driver.
>
> Report the native sensor size (pixel array), the crop bounds (readable
> pixel array area) and the current and default analog crop rectangles.
>
> Signed-off-by: Luca Weiss <luca@...tu.xyz>

As the driver supports a single mode you could have hard-coded
the rectangle sizes in get_selection(), but this way is much better as
it prepares for adding more modes to the driver eventually.

Thanks
Reviewed-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>

> ---
>  drivers/media/i2c/ov2685.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 61 insertions(+)
>
> diff --git a/drivers/media/i2c/ov2685.c b/drivers/media/i2c/ov2685.c
> index bfced11b178b..7ebf36d1a8cc 100644
> --- a/drivers/media/i2c/ov2685.c
> +++ b/drivers/media/i2c/ov2685.c
> @@ -56,6 +56,9 @@
>  #define OV2685_REG_VALUE_16BIT		2
>  #define OV2685_REG_VALUE_24BIT		3
>
> +#define OV2685_NATIVE_WIDTH		1616
> +#define OV2685_NATIVE_HEIGHT		1216
> +
>  #define OV2685_LANES			1
>  #define OV2685_BITS_PER_SAMPLE		10
>
> @@ -78,6 +81,7 @@ struct ov2685_mode {
>  	u32 exp_def;
>  	u32 hts_def;
>  	u32 vts_def;
> +	const struct v4l2_rect *analog_crop;
>  	const struct regval *reg_list;
>  };
>
> @@ -231,6 +235,13 @@ static const int ov2685_test_pattern_val[] = {
>  	OV2685_TEST_PATTERN_COLOR_SQUARE,
>  };
>
> +static const struct v4l2_rect ov2685_analog_crop = {
> +	.left	= 8,
> +	.top	= 8,
> +	.width	= 1600,
> +	.height	= 1200,
> +};
> +
>  static const struct ov2685_mode supported_modes[] = {
>  	{
>  		.width = 1600,
> @@ -238,6 +249,7 @@ static const struct ov2685_mode supported_modes[] = {
>  		.exp_def = 0x04ee,
>  		.hts_def = 0x06a4,
>  		.vts_def = 0x050e,
> +		.analog_crop = &ov2685_analog_crop,
>  		.reg_list = ov2685_1600x1200_regs,
>  	},
>  };
> @@ -384,6 +396,53 @@ static int ov2685_enum_frame_sizes(struct v4l2_subdev *sd,
>  	return 0;
>  }
>
> +static const struct v4l2_rect *
> +__ov2685_get_pad_crop(struct ov2685 *ov2685,
> +		      struct v4l2_subdev_state *state, unsigned int pad,
> +		      enum v4l2_subdev_format_whence which)
> +{
> +	const struct ov2685_mode *mode = ov2685->cur_mode;
> +
> +	switch (which) {
> +	case V4L2_SUBDEV_FORMAT_TRY:
> +		return v4l2_subdev_get_try_crop(&ov2685->subdev, state, pad);
> +	case V4L2_SUBDEV_FORMAT_ACTIVE:
> +		return mode->analog_crop;
> +	}
> +
> +	return NULL;
> +}
> +
> +static int ov2685_get_selection(struct v4l2_subdev *sd,
> +				struct v4l2_subdev_state *sd_state,
> +				struct v4l2_subdev_selection *sel)
> +{
> +	struct ov2685 *ov2685 = to_ov2685(sd);
> +
> +	switch (sel->target) {
> +	case V4L2_SEL_TGT_CROP:
> +		mutex_lock(&ov2685->mutex);
> +		sel->r = *__ov2685_get_pad_crop(ov2685, sd_state, sel->pad,
> +				sel->which);
> +		mutex_unlock(&ov2685->mutex);
> +		break;
> +	case V4L2_SEL_TGT_NATIVE_SIZE:
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +		sel->r.top = 0;
> +		sel->r.left = 0;
> +		sel->r.width = OV2685_NATIVE_WIDTH;
> +		sel->r.height = OV2685_NATIVE_HEIGHT;
> +		break;
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +		sel->r = ov2685_analog_crop;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  /* Calculate the delay in us by clock rate and clock cycles */
>  static inline u32 ov2685_cal_delay(u32 cycles)
>  {
> @@ -592,6 +651,8 @@ static const struct v4l2_subdev_pad_ops ov2685_pad_ops = {
>  	.enum_frame_size = ov2685_enum_frame_sizes,
>  	.get_fmt = ov2685_get_fmt,
>  	.set_fmt = ov2685_set_fmt,
> +	.get_selection = ov2685_get_selection,
> +	.set_selection = ov2685_get_selection,
>  };
>
>  static const struct v4l2_subdev_ops ov2685_subdev_ops = {
>
> --
> 2.39.1
>