linux-kernel - Re: [PATCH v3 1/2] drm/msm/dp: Add support for determining the eDP/DP mode from DT

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Date: Fri, 22 Mar 2024 15:30:54 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	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 v3 1/2] drm/msm/dp: Add support for determining the eDP/DP
 mode from DT

On Fri, 22 Mar 2024 at 15:22, Abel Vesa <abel.vesa@...aro.org> 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 is not described

Nit: External DP doesn't have a panel described in DT...

> in DT, therefore, assume it's eDP if panel node is present.
>
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 43 +++++++++++++++++++++++++++++++++----
>  1 file changed, 39 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index c4cb82af5c2f..c9763f77c832 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);
> @@ -734,9 +742,7 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
>                 goto error;
>         }
>
> -       dp->aux = dp_aux_get(dev, dp->catalog,
> -                            phy,
> -                            dp->dp_display.is_edp);
> +       dp->aux = dp_aux_get(dev, dp->catalog, phy, dp->dp_display.is_edp);

Unrelated

>         if (IS_ERR(dp->aux)) {
>                 rc = PTR_ERR(dp->aux);
>                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
> @@ -1241,6 +1247,35 @@ 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 *dev = &pdev->dev;
> +       struct device_node *aux_bus;
> +       struct device_node *panel;
> +       int ret = DRM_MODE_CONNECTOR_DisplayPort;
> +
> +       /* legacy platforms specify connector type in match data */
> +       if (desc->connector_type == DRM_MODE_CONNECTOR_eDP ||
> +               desc->connector_type == DRM_MODE_CONNECTOR_DisplayPort)

misaligned

> +               return desc->connector_type;

Can we drop this part completely?

> +
> +       aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
> +       if (!aux_bus)
> +               goto out;
> +
> +       panel = of_get_child_by_name(aux_bus, "panel");
> +       if (!panel)
> +               goto out;
> +
> +       ret = DRM_MODE_CONNECTOR_eDP;
> +
> +out:
> +       of_node_put(panel);
> +       of_node_put(aux_bus);
> +       return ret;
> +}
> +
>  static int dp_display_probe(struct platform_device *pdev)
>  {
>         int rc = 0;
> @@ -1263,7 +1298,7 @@ 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
>


-- 
With best wishes
Dmitry