linux-kernel - Re: [PATCH v1 7/7] drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188

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Message-ID: <de8b0cb760cd0586014426536138f79fe5dd1ed8.camel@mediatek.com>
Date: Wed, 4 Dec 2024 09:41:05 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"tzimmermann@...e.de" <tzimmermann@...e.de>, "simona@...ll.ch"
	<simona@...ll.ch>, "mripard@...nel.org" <mripard@...nel.org>,
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	<p.zabel@...gutronix.de>, "maarten.lankhorst@...ux.intel.com"
	<maarten.lankhorst@...ux.intel.com>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
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	<matthias.bgg@...il.com>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>
Subject: Re: [PATCH v1 7/7] drm/mediatek: Introduce HDMI/DDC v2 for
 MT8195/MT8188

Hi, Angelo:

On Wed, 2024-11-20 at 13:45 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> Add support for the newer HDMI-TX (Encoder) v2 and DDC v2 IPs
> found in MediaTek's MT8195, MT8188 SoC and their variants, and
> including support for display modes up to 4k60 and for HDMI
> Audio, as per the HDMI 2.0 spec.
> 
> HDCP and CEC functionalities are also supported by this hardware,
> but are not included in this commit.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---

[snip]

> +static const struct drm_edid *mtk_hdmi_v2_bridge_edid_read(struct drm_bridge *bridge,
> +                                                       struct drm_connector *connector)
> +{

This function is identical to v1, so make edid read as common function.

Regards,
CK

> +       struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +       const struct drm_edid *drm_edid;
> +
> +       if (!hdmi->ddc_adpt)
> +               return NULL;
> +
> +       drm_edid = drm_edid_read_ddc(connector, hdmi->ddc_adpt);
> +       if (drm_edid) {
> +               /*
> +                * This should use !connector->display_info.has_audio (or
> +                * !connector->display_info.is_hdmi) from a path that has read
> +                * the EDID and called drm_edid_connector_update().
> +                */
> +               const struct edid *edid = drm_edid_raw(drm_edid);
> +
> +               hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
> +       }
> +
> +       return drm_edid;
> +}
> +

>