linux-kernel - Re: [PATCH v2 17/23] media: rkvdec: Enable capture buffer holding for H264

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Date:   Sat, 2 Apr 2022 08:35:33 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel@...labora.com,
        Sebastian Fricke <sebastian.fricke@...labora.com>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 17/23] media: rkvdec: Enable capture buffer holding
 for H264

On Thu, Mar 31, 2022 at 03:37:19PM -0400, Nicolas Dufresne wrote:
> In order to support interlaced video decoding, the driver must
> allow holding the capture buffer so that the second field can
> be decoded into it.
> 
> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> Reviewed-by: Sebastian Fricke <sebastian.fricke@...labora.com>

IMO, this patch (and the similar one for Hantro) should come
after interlaced support is added.

Thanks,
Ezequiel

> ---
>  drivers/staging/media/rkvdec/rkvdec.c | 4 ++++
>  drivers/staging/media/rkvdec/rkvdec.h | 1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index 1b805710e195..b6376eaa92d7 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -148,6 +148,7 @@ static const struct rkvdec_coded_fmt_desc rkvdec_coded_fmts[] = {
>  		.ops = &rkvdec_h264_fmt_ops,
>  		.num_decoded_fmts = ARRAY_SIZE(rkvdec_h264_vp9_decoded_fmts),
>  		.decoded_fmts = rkvdec_h264_vp9_decoded_fmts,
> +		.subsystem_flags = VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF,
>  	},
>  	{
>  		.fourcc = V4L2_PIX_FMT_VP9_FRAME,
> @@ -404,6 +405,9 @@ static int rkvdec_s_output_fmt(struct file *file, void *priv,
>  	cap_fmt->fmt.pix_mp.ycbcr_enc = f->fmt.pix_mp.ycbcr_enc;
>  	cap_fmt->fmt.pix_mp.quantization = f->fmt.pix_mp.quantization;
>  
> +	/* Enable format specific queue features */
> +	vq->subsystem_flags |= desc->subsystem_flags;
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/staging/media/rkvdec/rkvdec.h b/drivers/staging/media/rkvdec/rkvdec.h
> index 2f4ea1786b93..e37f1a015fa0 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.h
> +++ b/drivers/staging/media/rkvdec/rkvdec.h
> @@ -81,6 +81,7 @@ struct rkvdec_coded_fmt_desc {
>  	const struct rkvdec_coded_fmt_ops *ops;
>  	unsigned int num_decoded_fmts;
>  	const u32 *decoded_fmts;
> +	u32 subsystem_flags;
>  };
>  
>  struct rkvdec_dev {
> -- 
> 2.34.1
>