linux-kernel - Re: [PATCH] media: mediatek: vcodec: Initialize decoder parameters after getting dec

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Date:   Mon, 20 Jun 2022 13:25:22 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Nicolas Dufresne <nicolas@...fresne.ca>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        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>,
        George Sun <george.sun@...iatek.com>,
        Xiaoyong Lu <xiaoyong.lu@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Irui Wang <irui.wang@...iatek.com>,
        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] media: mediatek: vcodec: Initialize decoder parameters
 after getting dec_capability

On Mon, Jun 20, 2022 at 12:54 PM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> On Sat, Jun 18, 2022 at 3:29 PM Yunfei Dong <yunfei.dong@...iatek.com> wrote:
> >
> > Need to get dec_capability from scp first, then initialize decoder
> > supported format and other parameters according to dec_capability value.
> >
> > Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
>
> Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
> Tested-by: Chen-Yu Tsai <wenst@...omium.org>
>
> Tested on MT8183 on mainline 20220617-next with the vcodec-dec DT node
> copied from the ChromeOS v5.10 kernel.
>
> This fixes an issue where the first attempt to enumerate formats on the
> device right after boot returns an empty list.

BTW, this should have a Fixes tag.

Either

Fixes: 7a7ae26fd458 ("media: mediatek: vcodec: support stateless VP8 decoding")

which looks like the first instance of when firmware capability really is
considered, or

Fixes: fd00d90330d1 ("media: mtk-vcodec: vdec: move stateful ops into
their own file")

which matches when ctx->dev->vdec_pdata->init_vdec_params(ctx) was first added.


ChenYu