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

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Message-ID: <CAAFQd5BcFr11Hpngpn6hNL91OibAxUv25yh2qMohgfxsKusACw@mail.gmail.com>
Date:   Tue, 23 Oct 2018 11:50:17 +0900
From:   Tomasz Figa <tfiga@...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>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: amend buffer size for bitstream plane

Hi Malathi,

On Tue, Oct 9, 2018 at 4:58 PM Malathi Gottam <mgottam@...eaurora.org> wrote:
>
> For lower resolutions, incase of encoder, the compressed
> frame size is more than half of the corresponding input
> YUV. Keep the size as same as YUV considering worst case.
>
> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/helpers.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index 2679adb..05c5423 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -649,7 +649,7 @@ u32 venus_helper_get_framesz(u32 v4l2_fmt, u32 width, u32 height)
>         }
>
>         if (compressed) {
> -               sz = ALIGN(height, 32) * ALIGN(width, 32) * 3 / 2 / 2;
> +               sz = ALIGN(height, 32) * ALIGN(width, 32) * 3 / 2;
>                 return ALIGN(sz, SZ_4K);
>         }

Note that the driver should not enforce one particular buffer size for
bitstream buffers unless it's a workaround for broken firmware or
hardware. The userspace should be able to select the desired size.

Best regards,
Tomasz