linux-kernel - Re: [PATCH v2 05/12] staging: media: rkvdec: Add SPS structure to internal context

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Message-ID: <CAAEAJfDqXJf-UovhGnmN7FDY-skSu-x5Rgz+K2WVQP+PKUVbsQ@mail.gmail.com>
Date:   Thu, 12 Jan 2023 12:02:31 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Sebastian Fricke <sebastian.fricke@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        Jonas Karlman <jonas@...boo.se>,
        Alex Bee <knaerzche@...il.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Collabora Kernel-domain <kernel@...labora.com>,
        Robert Beckett <bob.beckett@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: Re: [PATCH v2 05/12] staging: media: rkvdec: Add SPS structure to
 internal context

Hi Sebastian,

On Thu, Jan 12, 2023 at 9:56 AM Sebastian Fricke
<sebastian.fricke@...labora.com> wrote:
>
> Prepare storing the SPS structure for HEVC & H264 in the internal
> context of the rkvdec instance. This structure is used to figure out
> which capture queue format is appropriate for decoding.
>
> Signed-off-by: Sebastian Fricke <sebastian.fricke@...labora.com>
> ---
>  drivers/staging/media/rkvdec/rkvdec.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/staging/media/rkvdec/rkvdec.h b/drivers/staging/media/rkvdec/rkvdec.h
> index 633335ebb9c4..332126e7b812 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.h
> +++ b/drivers/staging/media/rkvdec/rkvdec.h
> @@ -105,6 +105,7 @@ struct rkvdec_ctx {
>         struct v4l2_ctrl_handler ctrl_hdl;
>         struct rkvdec_dev *dev;
>         void *priv;
> +       void *sps;

I don't really like re-caching the SPS in the context,
since all the controls are already stored in the context,
via the ctrl_handler.

See hantro_get_ctrl().

Duplicating state can lead to problems and even if we get it
right this time, will be hard to maintain.

Thanks,
Ezequiel

>  };
>
>  static inline struct rkvdec_ctx *fh_to_rkvdec_ctx(struct v4l2_fh *fh)
>
> --
> 2.25.1