linux-kernel - Re: [PATCH v4 1/2] drm/msm/dp: Add support for determining the eDP/DP mode from DT

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Message-ID: <20240326191454.GA1637694@hu-bjorande-lv.qualcomm.com>
Date: Tue, 26 Mar 2024 12:14:54 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Abel Vesa <abel.vesa@...aro.org>
CC: Rob Clark <robdclark@...il.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        "Maarten
 Lankhorst" <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Johan Hovold <johan@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] drm/msm/dp: Add support for determining the
 eDP/DP mode from DT

On Sun, Mar 24, 2024 at 08:56:51PM +0200, Abel Vesa wrote:
> Instead of relying on different compatibles for eDP and DP, lookup
> the panel node in devicetree to figure out the connector type and
> then pass on that information to the PHY. External DP doesn't have
> a panel described in DT, therefore, assume it's eDP if panel node
> is present.
> 

Reviewed-by: Bjorn Andersson <quic_bjorande@...cinc.com>

Regards,
Bjorn

> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index c4cb82af5c2f..9169a739cc54 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -726,6 +726,14 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
>  	if (IS_ERR(phy))
>  		return PTR_ERR(phy);
>  
> +	rc = phy_set_mode_ext(phy, PHY_MODE_DP,
> +			      dp->dp_display.is_edp ? PHY_SUBMODE_EDP : PHY_SUBMODE_DP);
> +	if (rc) {
> +		DRM_ERROR("failed to set phy submode, rc = %d\n", rc);
> +		dp->catalog = NULL;
> +		goto error;
> +	}
> +
>  	dp->catalog = dp_catalog_get(dev);
>  	if (IS_ERR(dp->catalog)) {
>  		rc = PTR_ERR(dp->catalog);
> @@ -1241,6 +1249,25 @@ static int dp_auxbus_done_probe(struct drm_dp_aux *aux)
>  	return dp_display_probe_tail(aux->dev);
>  }
>  
> +static int dp_display_get_connector_type(struct platform_device *pdev,
> +					 const struct msm_dp_desc *desc)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	struct device_node *aux_bus = of_get_child_by_name(node, "aux-bus");
> +	struct device_node *panel = of_get_child_by_name(aux_bus, "panel");
> +	int connector_type;
> +
> +	if (panel)
> +		connector_type = DRM_MODE_CONNECTOR_eDP;
> +	else
> +		connector_type = DRM_MODE_SUBCONNECTOR_DisplayPort;
> +
> +	of_node_put(panel);
> +	of_node_put(aux_bus);
> +
> +	return connector_type;
> +}
> +
>  static int dp_display_probe(struct platform_device *pdev)
>  {
>  	int rc = 0;
> @@ -1263,7 +1290,7 @@ static int dp_display_probe(struct platform_device *pdev)
>  	dp->dp_display.pdev = pdev;
>  	dp->name = "drm_dp";
>  	dp->id = desc->id;
> -	dp->dp_display.connector_type = desc->connector_type;
> +	dp->dp_display.connector_type = dp_display_get_connector_type(pdev, desc);
>  	dp->wide_bus_supported = desc->wide_bus_supported;
>  	dp->dp_display.is_edp =
>  		(dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
> 
> -- 
> 2.34.1
>