linux-kernel - Re: [PATCH v1 08/17] drm/mediatek: hdmi: add cec flag

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Message-ID: <b2ab259b-404d-a267-6fef-913c4514b078@collabora.com>
Date:   Tue, 20 Sep 2022 12:34:28 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Guillaume Ranquet <granquet@...libre.com>,
        Vinod Koul <vkoul@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>, Jitao shi <jitao.shi@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        Pablo Sun <pablo.sun@...iatek.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mattijs Korpershoek <mkorpershoek@...libre.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 08/17] drm/mediatek: hdmi: add cec flag

Il 19/09/22 18:56, Guillaume Ranquet ha scritto:
> Add a flag to indicate support for cec.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> index bfcca6f8b839..86653ebaacfd 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> @@ -154,35 +154,38 @@ int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device *pdev,
>   		return ret;
>   	}
>   
> -	/* The CEC module handles HDMI hotplug detection */
> -	cec_np = of_get_compatible_child(np->parent, "mediatek,mt8173-cec");
> -	if (!cec_np) {
> -		dev_err(dev, "Failed to find CEC node\n");
> -		return -EINVAL;
> -	}
> +	if (hdmi->conf->has_cec) {

I think that's a pointless overcomplication: I know why you're doing this but I'm
not sure that this is a good solution.

I would simply disable CEC support if there is no CEC child node and that's it...

Regards,
Angelo