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SubjectRe: [PATCH v3 17/23] camss: vfe: Add interface for scaling
Hi Todor,

On Mon, Jul 17, 2017 at 01:33:43PM +0300, Todor Tomov wrote:
> Add compose selection ioctls to handle scaling configuration.
>
> Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
> ---
> drivers/media/platform/qcom/camss-8x16/camss-vfe.c | 189 ++++++++++++++++++++-
> drivers/media/platform/qcom/camss-8x16/camss-vfe.h | 1 +
> 2 files changed, 188 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/camss-8x16/camss-vfe.c b/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
> index 327f158..8ec6ce7 100644
> --- a/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
> @@ -211,6 +211,8 @@
> #define CAMIF_TIMEOUT_SLEEP_US 1000
> #define CAMIF_TIMEOUT_ALL_US 1000000
>
> +#define SCALER_RATIO_MAX 16
> +
> static const u32 vfe_formats[] = {
> MEDIA_BUS_FMT_UYVY8_2X8,
> MEDIA_BUS_FMT_VYUY8_2X8,
> @@ -1905,6 +1907,25 @@ __vfe_get_format(struct vfe_line *line,
> return &line->fmt[pad];
> }
>
> +/*
> + * __vfe_get_compose - Get pointer to compose selection structure
> + * @line: VFE line
> + * @cfg: V4L2 subdev pad configuration
> + * @which: TRY or ACTIVE format
> + *
> + * Return pointer to TRY or ACTIVE compose rectangle structure
> + */
> +static struct v4l2_rect *
> +__vfe_get_compose(struct vfe_line *line,
> + struct v4l2_subdev_pad_config *cfg,
> + enum v4l2_subdev_format_whence which)
> +{
> + if (which == V4L2_SUBDEV_FORMAT_TRY)
> + return v4l2_subdev_get_try_compose(&line->subdev, cfg,
> + MSM_VFE_PAD_SINK);
> +
> + return &line->compose;
> +}
>
> /*
> * vfe_try_format - Handle try format by pad subdev method
> @@ -1951,7 +1972,14 @@ static void vfe_try_format(struct vfe_line *line,
> *fmt = *__vfe_get_format(line, cfg, MSM_VFE_PAD_SINK,
> which);
>
> - if (line->id == VFE_LINE_PIX)
> + if (line->id == VFE_LINE_PIX) {
> + struct v4l2_rect *rect;
> +
> + rect = __vfe_get_compose(line, cfg, which);
> +
> + fmt->width = rect->width;
> + fmt->height = rect->height;
> +
> switch (fmt->code) {
> case MEDIA_BUS_FMT_YUYV8_2X8:
> if (code == MEDIA_BUS_FMT_YUYV8_1_5X8)
> @@ -1979,6 +2007,7 @@ static void vfe_try_format(struct vfe_line *line,
> fmt->code = MEDIA_BUS_FMT_VYUY8_2X8;
> break;
> }
> + }
>
> break;
> }
> @@ -1987,6 +2016,50 @@ static void vfe_try_format(struct vfe_line *line,
> }
>
> /*
> + * vfe_try_compose - Handle try compose selection by pad subdev method
> + * @line: VFE line
> + * @cfg: V4L2 subdev pad configuration
> + * @rect: pointer to v4l2 rect structure
> + * @which: wanted subdev format
> + */
> +static void vfe_try_compose(struct vfe_line *line,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_rect *rect,
> + enum v4l2_subdev_format_whence which)
> +{
> + struct v4l2_mbus_framefmt *fmt;
> +
> + rect->width = rect->width - rect->left;
> + rect->left = 0;

This is the compose rectangle i.e. left and top should be zero (unless it's
about composing on e.g. a frame buffer). No need to decrement from width;
similarly for height below.

> + rect->height = rect->height - rect->top;
> + rect->top = 0;
> +
> + fmt = __vfe_get_format(line, cfg, MSM_VFE_PAD_SINK, which);
> +
> + if (rect->width > fmt->width)
> + rect->width = fmt->width;
> +
> + if (rect->height > fmt->height)
> + rect->height = fmt->height;
> +
> + if (fmt->width > rect->width * SCALER_RATIO_MAX)
> + rect->width = (fmt->width + SCALER_RATIO_MAX - 1) /
> + SCALER_RATIO_MAX;
> +
> + rect->width &= ~0x1;
> +
> + if (fmt->height > rect->height * SCALER_RATIO_MAX)
> + rect->height = (fmt->height + SCALER_RATIO_MAX - 1) /
> + SCALER_RATIO_MAX;
> +
> + if (rect->width < 16)
> + rect->width = 16;
> +
> + if (rect->height < 4)
> + rect->height = 4;
> +}
> +
> +/*
> * vfe_enum_mbus_code - Handle pixel format enumeration
> * @sd: VFE V4L2 subdevice
> * @cfg: V4L2 subdev pad configuration
> @@ -2081,6 +2154,10 @@ static int vfe_get_format(struct v4l2_subdev *sd,
> return 0;
> }
>
> +static int vfe_set_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_selection *sel);
> +
> /*
> * vfe_set_format - Handle set format by pads subdev method
> * @sd: VFE V4L2 subdevice
> @@ -2103,20 +2180,126 @@ static int vfe_set_format(struct v4l2_subdev *sd,
> vfe_try_format(line, cfg, fmt->pad, &fmt->format, fmt->which);
> *format = fmt->format;
>
> - /* Propagate the format from sink to source */
> if (fmt->pad == MSM_VFE_PAD_SINK) {
> + struct v4l2_subdev_selection sel = { 0 };
> + int ret;
> +
> + /* Propagate the format from sink to source */
> format = __vfe_get_format(line, cfg, MSM_VFE_PAD_SRC,
> fmt->which);
>
> *format = fmt->format;
> vfe_try_format(line, cfg, MSM_VFE_PAD_SRC, format,
> fmt->which);
> +
> + if (line->id != VFE_LINE_PIX)
> + return 0;
> +
> + /* Reset sink pad compose selection */
> + sel.which = fmt->which;
> + sel.pad = MSM_VFE_PAD_SINK;
> + sel.target = V4L2_SEL_TGT_COMPOSE;
> + sel.r.width = fmt->format.width;
> + sel.r.height = fmt->format.height;
> + ret = vfe_set_selection(sd, cfg, &sel);
> + if (ret < 0)
> + return ret;
> }
>
> return 0;
> }
>
> /*
> + * vfe_get_selection - Handle get selection by pads subdev method
> + * @sd: VFE V4L2 subdevice
> + * @cfg: V4L2 subdev pad configuration
> + * @sel: pointer to v4l2 subdev selection structure
> + *
> + * Return -EINVAL or zero on success
> + */
> +static int vfe_get_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_selection *sel)
> +{
> + struct vfe_line *line = v4l2_get_subdevdata(sd);
> + struct v4l2_subdev_format fmt = { 0 };
> + struct v4l2_rect *compose;
> + int ret;
> +
> + if (line->id != VFE_LINE_PIX || sel->pad != MSM_VFE_PAD_SINK)
> + return -EINVAL;
> +
> + switch (sel->target) {
> + case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> + fmt.pad = sel->pad;
> + fmt.which = sel->which;
> + ret = vfe_get_format(sd, cfg, &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;
> + break;
> + case V4L2_SEL_TGT_COMPOSE:
> + compose = __vfe_get_compose(line, cfg, sel->which);
> + if (compose == NULL)
> + return -EINVAL;
> +
> + sel->r = *compose;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * vfe_set_selection - Handle set selection by pads subdev method
> + * @sd: VFE V4L2 subdevice
> + * @cfg: V4L2 subdev pad configuration
> + * @sel: pointer to v4l2 subdev selection structure
> + *
> + * Return -EINVAL or zero on success
> + */
> +int vfe_set_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_selection *sel)
> +{
> + struct vfe_line *line = v4l2_get_subdevdata(sd);
> + struct v4l2_rect *compose;
> + struct v4l2_subdev_format fmt = { 0 };
> + int ret;
> +
> + if (line->id != VFE_LINE_PIX || sel->pad != MSM_VFE_PAD_SINK)
> + return -EINVAL;
> +
> + if (sel->target != V4L2_SEL_TGT_COMPOSE)
> + return -EINVAL;
> +
> + compose = __vfe_get_compose(line, cfg, sel->which);
> + if (compose == NULL)
> + return -EINVAL;
> +
> + vfe_try_compose(line, cfg, &sel->r, sel->which);
> + *compose = sel->r;
> +
> + /* Reset source pad format width and height */
> + fmt.which = sel->which;
> + fmt.pad = MSM_VFE_PAD_SRC;
> + ret = vfe_get_format(sd, cfg, &fmt);
> + if (ret < 0)
> + return ret;
> +
> + fmt.format.width = compose->width;
> + fmt.format.height = compose->height;
> + ret = vfe_set_format(sd, cfg, &fmt);
> +
> + return ret;
> +}
> +
> +/*
> * vfe_init_formats - Initialize formats on all pads
> * @sd: VFE V4L2 subdevice
> * @fh: V4L2 subdev file handle
> @@ -2310,6 +2493,8 @@ static const struct v4l2_subdev_pad_ops vfe_pad_ops = {
> .enum_frame_size = vfe_enum_frame_size,
> .get_fmt = vfe_get_format,
> .set_fmt = vfe_set_format,
> + .get_selection = vfe_get_selection,
> + .set_selection = vfe_set_selection,
> };
>
> static const struct v4l2_subdev_ops vfe_v4l2_ops = {
> diff --git a/drivers/media/platform/qcom/camss-8x16/camss-vfe.h b/drivers/media/platform/qcom/camss-8x16/camss-vfe.h
> index b0598e4..6518c7a 100644
> --- a/drivers/media/platform/qcom/camss-8x16/camss-vfe.h
> +++ b/drivers/media/platform/qcom/camss-8x16/camss-vfe.h
> @@ -80,6 +80,7 @@ struct vfe_line {
> struct v4l2_subdev subdev;
> struct media_pad pads[MSM_VFE_PADS_NUM];
> struct v4l2_mbus_framefmt fmt[MSM_VFE_PADS_NUM];
> + struct v4l2_rect compose;
> struct camss_video video_out;
> struct vfe_output output;
> };
> --
> 2.7.4
>

--
Sakari Ailus
e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk

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