linux-kernel - Re: [PATCH v6 drm-dp 5/9] drm/hisilicon/hibmc: Getting connector info and EDID by using AUX channel

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Message-ID: <87o6xyd5nn.fsf@intel.com>
Date: Tue, 18 Mar 2025 11:55:40 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Yongbang Shi <shiyongbang@...wei.com>, xinliang.liu@...aro.org,
 tiantao6@...ilicon.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
 daniel@...ll.ch, kong.kongxinwei@...ilicon.com
Cc: liangjian010@...wei.com, chenjianmin@...wei.com, lidongming5@...wei.com,
 shiyongbang@...wei.com, libaihan@...wei.com, shenjian15@...wei.com,
 shaojijie@...wei.com, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 drm-dp 5/9] drm/hisilicon/hibmc: Getting connector
 info and EDID by using AUX channel

On Mon, 10 Mar 2025, Yongbang Shi <shiyongbang@...wei.com> wrote:
> @@ -15,11 +15,17 @@
>  
>  static int hibmc_dp_connector_get_modes(struct drm_connector *connector)
>  {
> +	struct hibmc_dp *dp = to_hibmc_dp(connector);
> +	const struct drm_edid *drm_edid;
>  	int count;
>  
> -	count = drm_add_modes_noedid(connector, connector->dev->mode_config.max_width,
> -				     connector->dev->mode_config.max_height);
> -	drm_set_preferred_mode(connector, 1024, 768); // temporary implementation
> +	drm_edid = drm_edid_read_ddc(connector, &dp->aux.ddc);

drm_edid_read() should cover this if connector->ddc is set properly...

> @@ -103,8 +125,8 @@ int hibmc_dp_init(struct hibmc_drm_private *priv)
>  
>  	drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs);
>  
> -	ret = drm_connector_init(dev, connector, &hibmc_dp_conn_funcs,
> -				 DRM_MODE_CONNECTOR_DisplayPort);
> +	ret = drm_connector_init_with_ddc(dev, connector, &hibmc_dp_conn_funcs,
> +					  DRM_MODE_CONNECTOR_DisplayPort, &dp->aux.ddc);

...which you seem to do here.

BR,
Jani.


-- 
Jani Nikula, Intel