On 1/11/19 12:10 PM, Philipp Zabel wrote:
> Prepare for mbus format being smaller than the written rectangle
> due to burst size.
>
> Signed-off-by: Philipp Zabel <[email protected]>
> Reviewed-by: Steve Longerbeam <[email protected]>
> ---
> drivers/staging/media/imx/imx-media-capture.c | 56 +++++++++++++------
> 1 file changed, 38 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/staging/media/imx/imx-media-capture.c
> b/drivers/staging/media/imx/imx-media-capture.c
> index fb985e68f9ab..614e335fb61c 100644
> --- a/drivers/staging/media/imx/imx-media-capture.c
> +++ b/drivers/staging/media/imx/imx-media-capture.c
> @@ -203,21 +203,13 @@ static int capture_g_fmt_vid_cap(struct file *file,
> void *fh,
> return 0;
> }
>
> -static int capture_try_fmt_vid_cap(struct file *file, void *fh,
> - struct v4l2_format *f)
> +static int __capture_try_fmt_vid_cap(struct capture_priv *priv,
> + struct v4l2_subdev_format *fmt_src,
> + struct v4l2_format *f)
> {
> - struct capture_priv *priv = video_drvdata(file);
> - struct v4l2_subdev_format fmt_src;
> const struct imx_media_pixfmt *cc, *cc_src;
> - int ret;
>
> - fmt_src.pad = priv->src_sd_pad;
> - fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> - ret = v4l2_subdev_call(priv->src_sd, pad, get_fmt, NULL, &fmt_src);
> - if (ret)
> - return ret;
> -
> - cc_src = imx_media_find_ipu_format(fmt_src.format.code, CS_SEL_ANY);
> + cc_src = imx_media_find_ipu_format(fmt_src->format.code, CS_SEL_ANY);
> if (cc_src) {
> u32 fourcc, cs_sel;
>
> @@ -231,7 +223,7 @@ static int capture_try_fmt_vid_cap(struct file *file,
> void *fh,
> cc = imx_media_find_format(fourcc, cs_sel, false);
> }
> } else {
> - cc_src = imx_media_find_mbus_format(fmt_src.format.code,
> + cc_src = imx_media_find_mbus_format(fmt_src->format.code,
> CS_SEL_ANY, true);
> if (WARN_ON(!cc_src))
> return -EINVAL;
> @@ -239,15 +231,32 @@ static int capture_try_fmt_vid_cap(struct file *file,
> void *fh,
> cc = cc_src;
> }
>
> - imx_media_mbus_fmt_to_pix_fmt(&f->fmt.pix, &fmt_src.format, cc);
> + imx_media_mbus_fmt_to_pix_fmt(&f->fmt.pix, &fmt_src->format, cc);
>
> return 0;
> }
>
> +static int capture_try_fmt_vid_cap(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct capture_priv *priv = video_drvdata(file);
> + struct v4l2_subdev_format fmt_src;
> + int ret;
> +
> + fmt_src.pad = priv->src_sd_pad;
> + fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> + ret = v4l2_subdev_call(priv->src_sd, pad, get_fmt, NULL, &fmt_src);
> + if (ret)
> + return ret;
> +
> + return __capture_try_fmt_vid_cap(priv, &fmt_src, f);
> +}
> +
> static int capture_s_fmt_vid_cap(struct file *file, void *fh,
> struct v4l2_format *f)
> {
> struct capture_priv *priv = video_drvdata(file);
> + struct v4l2_subdev_format fmt_src;
> int ret;
>
> if (vb2_is_busy(&priv->q)) {
> @@ -255,7 +264,13 @@ static int capture_s_fmt_vid_cap(struct file *file, void
> *fh,
> return -EBUSY;
> }
>
> - ret = capture_try_fmt_vid_cap(file, priv, f);
> + fmt_src.pad = priv->src_sd_pad;
> + fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> + ret = v4l2_subdev_call(priv->src_sd, pad, get_fmt, NULL, &fmt_src);
> + if (ret)
> + return ret;
> +
> + ret = __capture_try_fmt_vid_cap(priv, &fmt_src, f);
> if (ret)
> return ret;
>
> @@ -264,8 +279,8 @@ static int capture_s_fmt_vid_cap(struct file *file, void
> *fh,
> CS_SEL_ANY, true);
> priv->vdev.compose.left = 0;
> priv->vdev.compose.top = 0;
> - priv->vdev.compose.width = f->fmt.pix.width;
> - priv->vdev.compose.height = f->fmt.pix.height;
> + priv->vdev.compose.width = fmt_src.format.width;
> + priv->vdev.compose.height = fmt_src.format.height;
>
> return 0;
> }
> @@ -306,9 +321,14 @@ static int capture_g_selection(struct file *file, void
> *fh,
> case V4L2_SEL_TGT_COMPOSE:
> case V4L2_SEL_TGT_COMPOSE_DEFAULT:
> case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> - case V4L2_SEL_TGT_COMPOSE_PADDED:
> s->r = priv->vdev.compose;
> break;
> + case V4L2_SEL_TGT_COMPOSE_PADDED:
Shouldn't this be for COMPOSE_BOUNDS as well?
Do you need _PADDED at all? That only makes sense if the DMA writes beyond
the COMPOSE rectangle due to padding requirements. I'm not aware that that's
the case for imx. I may be wrong, this would be correct if the DMA indeed
writes the full buffer, even if the actual image is smaller.
> + s->r.left = 0;
> + s->r.top = 0;
> + s->r.width = priv->vdev.fmt.fmt.pix.width;
> + s->r.height = priv->vdev.fmt.fmt.pix.height;
> + break;
> default:
> return -EINVAL;
> }
>
I see that the image is always DMAed to the top-left corner of the buffer.
Is there a need to implement s_selection so you can change the top-left
corner of the compose rectangle within the buffer?
Regards,
Hans
