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Date: Fri, 22 Mar 2024 16:15:23 +0200
From: Abel Vesa <abel.vesa@linaro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Rob Clark <robdclark@gmail.com>,
	Abhinav Kumar <quic_abhinavk@quicinc.com>,
	Sean Paul <sean@poorly.run>,
	Marijn Suijten <marijn.suijten@somainline.org>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Kuogee Hsieh <quic_khsieh@quicinc.com>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Johan Hovold <johan@kernel.org>, linux-arm-msm@vger.kernel.org,
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/2] drm/msm/dp: Add support for determining the
 eDP/DP mode from DT
Message-ID: <Zf2Se84QnWccpiM/@linaro.org>
References: <20240322-x1e80100-display-refactor-connector-v3-0-af14c29af665@linaro.org>
 <20240322-x1e80100-display-refactor-connector-v3-1-af14c29af665@linaro.org>
 <CAA8EJpp6V5qVzbYtnU=JjO8FX45fcxBvWsD3PWQ5bu5wuv-T=g@mail.gmail.com>
 <Zf2JYmm3DEaR8vB5@linaro.org>
 <CAA8EJppT2VAXMxAbMztbi=-QZj8nP++_Zy4RQHkY-DrO5W_3EQ@mail.gmail.com>
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On 24-03-22 15:38:03, Dmitry Baryshkov wrote:
> On Fri, 22 Mar 2024 at 15:36, Abel Vesa <abel.vesa@linaro.org> wrote:
> >
> > 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?
> 
> Legacy platforms still have the aux-bus/panel. so they should be
> handled by the check below.
> 

Oh, in that case we can drop the connector_type from every desc for all
platforms.

> >
> > > > +
> > > > +       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
> 
> 
> 
> -- 
> With best wishes
> Dmitry