linux-kernel - Re: [PATCH v2] media: mediatek: vcodec: Force capture queue format to MM21

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Message-ID: <e972c2ac1a7a6f0ce258c8056b82bdc87e4d8ceb.camel@ndufresne.ca>
Date:   Fri, 10 Feb 2023 10:36:25 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Steve Cho <stevecho@...omium.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2] media: mediatek: vcodec: Force capture queue format
 to MM21

Le vendredi 10 février 2023 à 13:55 +0800, Yunfei Dong a écrit :
> In order to conver the format of capture queue from mediatek MM21 to
> standard yuv420 with Libyuv, need to force capture queue format to
> MM21 for Libyuv can't covert mediatek MT21 format at current period.

Please rework this text, it is hard to understand.

> 
> Fixes: 7501edef6b1f ("media: mediatek: vcodec: Different codec using different capture format")
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.org>
> ---
> changed with v1:
> - add Fixes tag.
> ---
>  drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
> index 641f533c417f..4f5e9c20214f 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
> @@ -41,7 +41,7 @@ static bool mtk_vdec_get_cap_fmt(struct mtk_vcodec_ctx *ctx, int format_index)
>  	const struct mtk_video_fmt *fmt;
>  	struct mtk_q_data *q_data;
>  	int num_frame_count = 0, i;
> -	bool ret = true;
> +	bool ret = false;
>  
>  	for (i = 0; i < *dec_pdata->num_formats; i++) {
>  		if (dec_pdata->vdec_formats[i].type != MTK_FMT_FRAME)
> @@ -63,7 +63,7 @@ static bool mtk_vdec_get_cap_fmt(struct mtk_vcodec_ctx *ctx, int format_index)
>  	case V4L2_PIX_FMT_H264_SLICE:
>  	case V4L2_PIX_FMT_VP9_FRAME:
>  		if (fmt->fourcc == V4L2_PIX_FMT_MM21)
> -			ret = false;
> +			ret = true;

This makes the VP8 and the other cases identical, leaving anything that touches
MT21 as dead code. I'm not sure, cause I cannot test it, but it should in theory
render MT8192 unusable, unless a new firmware has been submitted to linux-
firmware with MM21 support ?

>  		break;
>  	default:
>  		ret = true;