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

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Date:   Mon, 12 Nov 2018 14:28:22 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Malathi Gottam <mgottam@...eaurora.org>, hverkuil@...all.nl,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, acourbot@...omium.org,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: amend buffer size for bitstream plane

Hi Malathi,

Thanks for the patch!

On 10/9/18 10:52 AM, Malathi Gottam 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;

Could you drop this division by 2 only for lower resolutions and also
only for the encoder session? I do not want to waste memory if it is not
absolutely needed.

-- 
regards,
Stan