linux-kernel - Re: [PATCH v4 24/27] venus: helpers: move frame size calculations on common place

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Date:   Mon, 2 Jul 2018 17:46:09 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, vgarodia@...eaurora.org,
        Tomasz Figa <tfiga@...omium.org>
Subject: Re: [PATCH v4 24/27] venus: helpers: move frame size calculations on
 common place

On Thu, Jun 28, 2018 at 12:28 AM Stanimir Varbanov
<stanimir.varbanov@...aro.org> wrote:
>
> This move the calculations of raw and compressed buffer sizes
> on common helper and make it identical for encoder and decoder.
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/platform/qcom/venus/helpers.c | 98 +++++++++++++++++++++++++++++
>  drivers/media/platform/qcom/venus/helpers.h |  2 +
>  drivers/media/platform/qcom/venus/vdec.c    | 54 ++++------------
>  drivers/media/platform/qcom/venus/venc.c    | 56 ++++-------------
>  4 files changed, 126 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index 6b31c91528ed..a342472ae2f0 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -452,6 +452,104 @@ int venus_helper_get_bufreq(struct venus_inst *inst, u32 type,
>  }
>  EXPORT_SYMBOL_GPL(venus_helper_get_bufreq);
>
> +static u32 get_framesize_raw_nv12(u32 width, u32 height)
> +{
> +       u32 y_stride, uv_stride, y_plane;
> +       u32 y_sclines, uv_sclines, uv_plane;
> +       u32 size;
> +
> +       y_stride = ALIGN(width, 128);
> +       uv_stride = ALIGN(width, 128);
> +       y_sclines = ALIGN(height, 32);
> +       uv_sclines = ALIGN(((height + 1) >> 1), 16);
> +
> +       y_plane = y_stride * y_sclines;
> +       uv_plane = uv_stride * uv_sclines + SZ_4K;
> +       size = y_plane + uv_plane + SZ_8K;

Do you know the reason for this extra 8K at the end?