linux-kernel - Re: [PATCH v10, 11/19] media: mtk-vcodec: Generalize power and clock on/off interfaces

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Message-ID: <YZN4se+Ihm2H20GG@google.com>
Date:   Tue, 16 Nov 2021 17:24:01 +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>,
        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 v10, 11/19] media: mtk-vcodec: Generalize power and clock
 on/off interfaces

On Thu, Nov 11, 2021 at 12:14:52PM +0800, Yunfei Dong wrote:
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
[...]
> +void *mtk_vcodec_get_hw_dev(struct mtk_vcodec_dev *dev, int hw_idx)
>  {
[...]
> +
> +	if (dev->subdev_dev[hw_idx])
> +		return dev->subdev_dev[hw_idx];
> +
> +	node = dev->subdev_node[hw_idx];
> +	if (!node) {
> +		mtk_v4l2_err("Get lat node fail:%d", hw_idx);
> +		return NULL;
> +	}
> +
> +	hw_pdev = of_find_device_by_node(node);
> +	of_node_put(node);

Raised the question in [v10,06/19] media: mtk-vcodec: Manage multi hardware information[1], is the reference count borrowed from mtk_vcodec_subdev_device_check?  If so, it needs comments for documentation.

[1]: https://patchwork.linuxtv.org/project/linux-media/patch/20211111041500.17363-7-yunfei.dong@mediatek.com/