linux-kernel - Re: [PATCH] venus: vdec: fix decoded data size

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Date:   Wed, 18 Jul 2018 14:31:10 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Vikash Garodia <vgarodia@...eaurora.org>
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, acourbot@...omium.org
Subject: Re: [PATCH] venus: vdec: fix decoded data size

Hi Vikash,

On 07/02/2018 10:44 AM, Vikash Garodia wrote:
> Exisiting code returns the max of the decoded
> size and buffer size. It turns out that buffer
> size is always greater due to hardware alignment
> requirement. As a result, payload size given to
> client is incorrect. This change ensures that
> the bytesused is assigned to actual payload size.
> 
> Change-Id: Ie6f3429c0cb23f682544748d181fa4fa63ca2e28
> Signed-off-by: Vikash Garodia <vgarodia@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/vdec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index d079aeb..ada1d2f 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -890,7 +890,7 @@ static void vdec_buf_done(struct venus_inst *inst, unsigned int buf_type,
>  
>  		vb = &vbuf->vb2_buf;
>  		vb->planes[0].bytesused =
> -			max_t(unsigned int, opb_sz, bytesused);
> +			min_t(unsigned int, opb_sz, bytesused);

Most probably my intension was to avoid bytesused == 0, but that is
allowed from v4l2 driver -> userspace direction

Could you drop min/max_t macros at all and use bytesused directly i.e.

vb2_set_plane_payload(vb, 0, bytesused)

-- 
regards,
Stan