linux-kernel - Re: [PATCH v4 5/8] drm/mediatek: hdmi: add v2 support

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Message-ID: <d9b7b71b0f7328830ff59c23b58b5d4bd361e85f.camel@mediatek.com>
Date:   Wed, 14 Jun 2023 03:41:01 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "kishon@...com" <kishon@...com>,
        Chunfeng Yun (云春峰) 
        <Chunfeng.Yun@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Jitao Shi (石记涛) <jitao.shi@...iatek.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "granquet@...libre.com" <granquet@...libre.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "airlied@...il.com" <airlied@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Mac Shen (沈俊) <Mac.Shen@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        Stuart Lee (李翰) <Stuart.Lee@...iatek.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v4 5/8] drm/mediatek: hdmi: add v2 support

Hi, Guillaume:

On Mon, 2023-05-29 at 16:31 +0200, Guillaume Ranquet wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Adds hdmi and hdmi-ddc support for v2 IP.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> ---

[snip]

> +
> +static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
> +  enum drm_bridge_attach_flags flags)
> +{
> +struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +int ret;
> +
> +if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> +DRM_ERROR("The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be
> supplied\n");
> +return -EINVAL;
> +}
> +if (hdmi->next_bridge) {
> +ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge, bridge,
> flags);
> +if (ret)
> +return ret;
> +}
> +
> +pm_runtime_enable(hdmi->dev);
> +mtk_hdmi_enable_disable(hdmi, true);

In mt8173 hdmi driver, the bridge attach function does not enable hdmi,
could you align the enable timing with mt8173? If not, please explain.

> +
> +return 0;
> +}

This function is almost the same as mt8173 one, try to merge them.

Regards,
CK

> +
>