linux-kernel - Re: [PATCH v2] media: venus: amend buffer size for bitstream plane

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Date:   Mon, 26 Nov 2018 17:21:45 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     mgottam@...eaurora.org
Cc:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, vgarodia@...eaurora.org
Subject: Re: [PATCH v2] media: venus: amend buffer size for bitstream plane

Hi Malathi,

On Tue, Nov 20, 2018 at 3:53 PM Malathi Gottam <mgottam@...eaurora.org> wrote:
>
> Accept the buffer size requested by client and compare it
> against driver calculated size and set the maximum to
> bitstream plane.
>
> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/venc.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
> index ce85962..ecfdbd6 100644
> --- a/drivers/media/platform/qcom/venus/venc.c
> +++ b/drivers/media/platform/qcom/venus/venc.c
> @@ -303,6 +303,7 @@ static int venc_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
>         struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
>         struct v4l2_plane_pix_format *pfmt = pixmp->plane_fmt;
>         const struct venus_format *fmt;
> +       __u32 sizeimage;
>
>         memset(pfmt[0].reserved, 0, sizeof(pfmt[0].reserved));
>         memset(pixmp->reserved, 0, sizeof(pixmp->reserved));
> @@ -334,9 +335,10 @@ static int venc_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
>         pixmp->num_planes = fmt->num_planes;
>         pixmp->flags = 0;
>
> -       pfmt[0].sizeimage = venus_helper_get_framesz(pixmp->pixelformat,
> -                                                    pixmp->width,
> -                                                    pixmp->height);
> +       sizeimage = venus_helper_get_framesz(pixmp->pixelformat,
> +                                            pixmp->width,
> +                                            pixmp->height);
> +       pfmt[0].sizeimage = max(ALIGN(pfmt[0].sizeimage, SZ_4K), sizeimage);
>
>         if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
>                 pfmt[0].bytesperline = ALIGN(pixmp->width, 128);
> @@ -408,8 +410,10 @@ static int venc_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
>
>         if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
>                 inst->fmt_out = fmt;
> -       else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +       else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
>                 inst->fmt_cap = fmt;
> +               inst->output_buf_size = pixmp->plane_fmt[0].sizeimage;
> +       }
>
>         return 0;
>  }
> @@ -908,6 +912,7 @@ static int venc_queue_setup(struct vb2_queue *q,
>                 sizes[0] = venus_helper_get_framesz(inst->fmt_cap->pixfmt,
>                                                     inst->width,
>                                                     inst->height);
> +               sizes[0] = max(sizes[0], inst->output_buf_size);
>                 inst->output_buf_size = sizes[0];
>                 break;
>         default:

I think this should work, but don't we also need to do the same thing
for the decoder's OUTPUT queue?