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SubjectRe: [RFC PATCH v2 12/18] media: tegra-video: Add support for selection ioctl ops
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On 17/06/2020 03:41, Sowjanya Komatineni wrote:
> This patch adds selection v4l2 ioctl operations to allow configuring
> a selection rectangle in the sensor through the Tegra video device
> node.
>
> Some sensor drivers supporting crop uses try_crop rectangle from
> v4l2_subdev_pad_config during try format for computing binning.
>
> So with selection ops support, this patch also updates try format
> to use try crop rectangle either from subdev frame size enumeration
> or from subdev crop boundary.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
> drivers/staging/media/tegra-video/vi.c | 106 +++++++++++++++++++++++++++++++++
> 1 file changed, 106 insertions(+)
>
> diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
> index 506c263..f9eb96b 100644
> --- a/drivers/staging/media/tegra-video/vi.c
> +++ b/drivers/staging/media/tegra-video/vi.c
> @@ -427,6 +427,13 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
> struct v4l2_subdev *subdev;
> struct v4l2_subdev_format fmt;
> struct v4l2_subdev_pad_config *pad_cfg;
> + struct v4l2_subdev_frame_size_enum fse = {
> + .which = V4L2_SUBDEV_FORMAT_TRY,
> + };
> + struct v4l2_subdev_selection sdsel = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + .target = V4L2_SEL_TGT_CROP_BOUNDS,
> + };
> int ret;
>
> subdev = tegra_channel_get_remote_subdev(chan, true);
> @@ -449,6 +456,24 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
> fmt.which = V4L2_SUBDEV_FORMAT_TRY;
> fmt.pad = 0;
> v4l2_fill_mbus_format(&fmt.format, pix, fmtinfo->code);
> +
> + /*
> + * Attempt to obtain the format size from subdev.
> + * If not available, try to get crop boundary from subdev.
> + */
> + fse.code = fmtinfo->code;
> + ret = v4l2_subdev_call(subdev, pad, enum_frame_size, pad_cfg, &fse);
> + if (ret) {
> + ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
> + if (ret)
> + return -EINVAL;
> + pad_cfg->try_crop.width = sdsel.r.width;
> + pad_cfg->try_crop.height = sdsel.r.height;
> + } else {
> + pad_cfg->try_crop.width = fse.max_width;
> + pad_cfg->try_crop.height = fse.max_height;
> + }
> +
> ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
> if (ret < 0)
> return ret;
> @@ -540,6 +565,85 @@ static int tegra_channel_set_subdev_active_fmt(struct tegra_vi_channel *chan)
> return 0;
> }
>
> +static int tegra_channel_g_selection(struct file *file, void *priv,
> + struct v4l2_selection *sel)
> +{
> + struct tegra_vi_channel *chan = video_drvdata(file);
> + struct v4l2_subdev *subdev;
> + struct v4l2_subdev_format fmt = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + struct v4l2_subdev_selection sdsel = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + .target = sel->target,
> + };
> + int ret;
> +
> + if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
> + return -ENOTTY;
> +
> + if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> + /*
> + * Try the get selection operation and fallback to get format if not
> + * implemented.
> + */
> + subdev = tegra_channel_get_remote_subdev(chan, true);
> + ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
> + if (!ret)
> + sel->r = sdsel.r;
> + if (ret != -ENOIOCTLCMD)
> + return ret;
> +
> + ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
> + if (ret < 0)
> + return ret;
> +
> + sel->r.left = 0;
> + sel->r.top = 0;
> + sel->r.width = fmt.format.width;
> + sel->r.height = fmt.format.height;
> +
> + return 0;
> +}
> +
> +static int tegra_channel_s_selection(struct file *file, void *fh,
> + struct v4l2_selection *sel)
> +{
> + struct tegra_vi_channel *chan = video_drvdata(file);
> + struct v4l2_subdev *subdev;
> + int ret;
> + struct v4l2_subdev_selection sdsel = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + .target = sel->target,
> + .flags = sel->flags,
> + .r = sel->r,
> + };
> +

This function doesn't check if the subdev actually supports set_selection.
The imx219 is one such driver: it supports get_selection, but not set_selection.

So this code should add these lines to fix the v4l2-compliance fail:

subdev = tegra_channel_get_remote_subdev(chan, true);

if (!v4l2_subdev_has_op(subdev, pad, set_selection))
return -ENOTTY;


> + if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
> + return -ENOTTY;
> +
> + if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + if (vb2_is_busy(&chan->queue))
> + return -EBUSY;
> +
> + subdev = tegra_channel_get_remote_subdev(chan, true);

And this line can be dropped.

Regards,

Hans

> + ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
> + if (!ret) {
> + sel->r = sdsel.r;
> + /*
> + * Subdev active format resolution may have changed during
> + * set selection operation. So, update channel format to
> + * the sub-device active format.
> + */
> + return tegra_channel_set_subdev_active_fmt(chan);
> + }
> +
> + return ret;
> +}
> +
> static int tegra_channel_enum_input(struct file *file, void *fh,
> struct v4l2_input *inp)
> {
> @@ -597,6 +701,8 @@ static const struct v4l2_ioctl_ops tegra_channel_ioctl_ops = {
> .vidioc_streamoff = vb2_ioctl_streamoff,
> .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> + .vidioc_g_selection = tegra_channel_g_selection,
> + .vidioc_s_selection = tegra_channel_s_selection,
> };
>
> /*
>

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