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

[Abel Vesa <abel.vesa@linaro.org>]

On 24-03-22 15:30:54, Dmitry Baryshkov wrote:
> On Fri, 22 Mar 2024 at 15:22, Abel Vesa <abel.vesa@linaro.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...
> 

Will fix.

> > in DT, therefore, assume it's eDP if panel node is present.
> >
> > Signed-off-by: Abel Vesa <abel.vesa@linaro.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
> 

Yep, will drop the change.

> >         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
> 

Sure, will fix.

> > +               return desc->connector_type;
> 
> Can we drop this part completely?
> 

You mean the whole if clause? How should we handle the legacy approach
then?

> > +
> > +       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