linux-kernel - Re: [PATCH v4, 04/15] media: mtk-vcodec: Use component framework to manage each hardware information

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Date:   Tue, 10 Aug 2021 19:13:42 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     Yunfei Dong <Yunfei.Dong@...iatek.com>
Cc:     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>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.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,
        George Sun <george.sun@...iatek.com>
Subject: Re: [PATCH v4, 04/15] media: mtk-vcodec: Use component framework to
 manage each hardware information

On Tue, Aug 10, 2021 at 04:30:36PM +0800, Yunfei Dong wrote:
>   > Looking up "mediatek,mtk-vcodec-core" to determine if it uses component framwork sounds like...
>   Add prameter in pdata, for all platform will use compoent after mt8183
>
>   >> +     if (dev->is_comp_supported) {
>   >> +             ret = mtk_vcodec_init_master(dev);
>   >> +             if (ret < 0)
>   >> +                     goto err_component_match;
>   >> +     } else {
>   >> +             platform_set_drvdata(pdev, dev);
>   >> +     }
>   > + Has asked the same question in [1].  Why it removes the
>   > +platform_set_drvdata() above?  mtk_vcodec_init_master() also calls platform_set_drvdata().
>   Must call component_master_add_with_match after platform_set_drvdata for component architecture.
I am confused.  The condition "call component_master_add_with_match
after platform_set_drvdata" is already true even if without the
change.  See below.

> +static int mtk_vcodec_init_master(struct mtk_vcodec_dev *dev)
> +{
> +     struct platform_device *pdev = dev->plat_dev;
> +     struct component_match *match;
> +     int ret;
> +
> +     match = mtk_vcodec_match_add(dev);
> +     if (IS_ERR_OR_NULL(match))
> +             return -EINVAL;
> +
> +     platform_set_drvdata(pdev, dev);
> +     ret = component_master_add_with_match(&pdev->dev, &mtk_vdec_ops, match);
Point [1].

> @@ -311,7 +413,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>               MTK_VCODEC_DEC_NAME);
>       video_set_drvdata(vfd_dec, dev);
>       dev->vfd_dec = vfd_dec;
> -     platform_set_drvdata(pdev, dev);
Point [2].

> @@ -362,8 +463,16 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>       mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
>               vfd_dec->num);
>
> -     return 0;
> +     if (dev->vdec_pdata->is_comp_supported) {
> +             ret = mtk_vcodec_init_master(dev);
Point [3].


The calling sequence is: [2] -> component_master_add_with_match() -> [1] -> [3].

Don't understand why it removes the platform_set_drvdata() at point [2].