linux-kernel - Re: [PATCH v2] media: mtk-vcodec: Align width and height to 64 bytes

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Date:   Wed, 03 Nov 2021 11:23:38 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Steve Cho <stevecho@...gle.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...gle.com>
Cc:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Irui Wang <irui.wang@...iatek.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        srv_heupstream@...iatek.com, linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2] media: mtk-vcodec: Align width and height to 64 bytes

Le mercredi 03 novembre 2021 à 11:37 +0800, Yunfei Dong a écrit :
> Width and height need to 64 bytes aligned when setting the format.
> Need to make sure all is 64 bytes align when use width and height to
> calculate buffer size.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> Change-Id: I39886b1a6b433c92565ddbf297eb193456eec1d2

Perhaps avoid this tag later ? Another perhaps, there is a tag to indicate which
patch introduce that bug, if you add this tag, the patch will be automatically
backported into relevant stable kernel. The format is:

> Fixes: <short-hash> ("<short commit description")

Acked-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

> ---
>  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h        | 1 +
>  drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c | 4 ++--
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> index e30806c1faea..66cd6d2242c3 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> @@ -11,6 +11,7 @@
>  #include <media/videobuf2-core.h>
>  #include <media/v4l2-mem2mem.h>
>  
> +#define VCODEC_DEC_ALIGNED_64 64
>  #define VCODEC_CAPABILITY_4K_DISABLED	0x10
>  #define VCODEC_DEC_4K_CODED_WIDTH	4096U
>  #define VCODEC_DEC_4K_CODED_HEIGHT	2304U
> diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c
> index d402fc4bda69..e1a3011772a9 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c
> +++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c
> @@ -562,8 +562,8 @@ static void get_pic_info(struct vdec_h264_slice_inst *inst,
>  {
>  	struct mtk_vcodec_ctx *ctx = inst->ctx;
>  
> -	ctx->picinfo.buf_w = (ctx->picinfo.pic_w + 15) & 0xFFFFFFF0;
> -	ctx->picinfo.buf_h = (ctx->picinfo.pic_h + 31) & 0xFFFFFFE0;
> +	ctx->picinfo.buf_w = ALIGN(ctx->picinfo.pic_w, VCODEC_DEC_ALIGNED_64);
> +	ctx->picinfo.buf_h = ALIGN(ctx->picinfo.pic_h, VCODEC_DEC_ALIGNED_64);
>  	ctx->picinfo.fb_sz[0] = ctx->picinfo.buf_w * ctx->picinfo.buf_h;
>  	ctx->picinfo.fb_sz[1] = ctx->picinfo.fb_sz[0] >> 1;
>  	inst->vsi_ctx.dec.cap_num_planes =