Re: [PATCH v7 07/11] media: rkvdec: Add the VP9 backend

[Chen-Yu Tsai]

Hi,

On Thu, Sep 30, 2021 at 12:07 AM Andrzej Pietrasiewicz
<andrzej.p@xxxxxxxxxxxxx> wrote:
>
> From: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
>
> The Rockchip VDEC supports VP9 profile 0 up to 4096x2304@30fps. Add
> a backend for this new format.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx>
> Co-developed-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
> ---
>  drivers/staging/media/rkvdec/Kconfig      |    1 +
>  drivers/staging/media/rkvdec/Makefile     |    2 +-
>  drivers/staging/media/rkvdec/rkvdec-vp9.c | 1078 +++++++++++++++++++++
>  drivers/staging/media/rkvdec/rkvdec.c     |   52 +-
>  drivers/staging/media/rkvdec/rkvdec.h     |   12 +-
>  5 files changed, 1137 insertions(+), 8 deletions(-)
>  create mode 100644 drivers/staging/media/rkvdec/rkvdec-vp9.c
>

[...]

> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index 7131156c1f2c..6aa8aca66547 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c

[...]

> @@ -319,7 +354,7 @@ static int rkvdec_s_output_fmt(struct file *file, void *priv,
>         struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
>         const struct rkvdec_coded_fmt_desc *desc;
>         struct v4l2_format *cap_fmt;
> -       struct vb2_queue *peer_vq;
> +       struct vb2_queue *peer_vq, *vq;
>         int ret;
>
>         /*
> @@ -331,6 +366,15 @@ static int rkvdec_s_output_fmt(struct file *file, void *priv,
>         if (vb2_is_busy(peer_vq))
>                 return -EBUSY;
>
> +       /*
> +        * Some codecs like VP9 can contain dynamic resolution changes which
> +        * are currently not supported by the V4L2 API or driver, so return
> +        * an error if userspace tries to reconfigure the output format.
> +        */
> +       vq = v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +       if (vb2_is_busy(vq))
> +               return -EINVAL;

This check is already done in rkvdec_s_fmt(), though it returns -EBUSY
instead. And I don't see similar changes to Hantro, so maybe this isn't
an API limitation as described in the comment? My recent patch [1] also
loosens the restrictions on this.

ChenYu

[1] https://lore.kernel.org/linux-media/20211008100423.739462-3-wenst@xxxxxxxxxxxx/

> +
>         ret = rkvdec_s_fmt(file, priv, f, rkvdec_try_output_fmt);
>         if (ret)
>                 return ret;