linux-kernel - Re: [PATCH] media: meson: vdec: fix OUTPUT buffer size configuration

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Message-ID: <d6f50786-16d9-8933-30ff-418b47089149@baylibre.com>
Date:   Thu, 6 Feb 2020 08:59:30 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Maxime Jourdan <mjourdan@...libre.com>, mchehab@...nel.org,
        hans.verkuil@...co.com
Cc:     linux-media@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: meson: vdec: fix OUTPUT buffer size configuration

On 27/01/2020 16:19, Maxime Jourdan wrote:
> There's a bug currently where we always override the OUTPUT buffer size
> in try_fmt to the default value (1M), preventing userspace from setting
> a higher or lower size.
> 
> Now, only update the size in try_fmt if userspace passed 0.
> 
> Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
> ---
> 
> Note: this patch depends on Neil's series:
> media: meson: vdec: Add compliant H264 support
> https://patchwork.kernel.org/cover/11336953/
> 
>  drivers/staging/media/meson/vdec/vdec.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/meson/vdec/vdec.c b/drivers/staging/media/meson/vdec/vdec.c
> index 1be67b122546..2f30945ce916 100644
> --- a/drivers/staging/media/meson/vdec/vdec.c
> +++ b/drivers/staging/media/meson/vdec/vdec.c
> @@ -519,7 +519,8 @@ vdec_try_fmt_common(struct amvdec_session *sess, u32 size,
>  	output_size = get_output_size(pixmp->width, pixmp->height);
>  
>  	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> -		pfmt[0].sizeimage = sess->src_buffer_size;
> +		if (!pfmt[0].sizeimage)
> +			pfmt[0].sizeimage = sess->src_buffer_size;
>  		pfmt[0].bytesperline = 0;
>  		pixmp->num_planes = 1;
>  	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> 


Will squash into v5 of "media: meson: vdec: Add compliant H264 support"

Thanks,
Neil