[Nouveau] [PATCH v3 5/7] drm/nouveau: utilize subconnector property for DP

[Ilia Mirkin]

This should probably be fixed to account for the scenario where an
HDMI connector is plugged directly into the DP++ port. I don't think
the dp.subconnector property will be valid in that case.
(Unfortunately I don't remember how one detects that particular
situation.)

On Mon, Aug 26, 2019 at 9:22 AM Oleg Vasilev <oleg.vasilev at intel.com> wrote:
>
> Since DP-specific information is stored in driver's structures, every
> driver needs to implement subconnector property by itself.
>
> Reviewed-by: Emil Velikov <emil.velikov at collabora.com>
> Signed-off-by: Oleg Vasilev <oleg.vasilev at intel.com>
> Cc: Ben Skeggs <bskeggs at redhat.com>
> Cc: nouveau at lists.freedesktop.org
> ---
>  drivers/gpu/drm/nouveau/nouveau_connector.c | 13 +++++++++++++
>  drivers/gpu/drm/nouveau/nouveau_dp.c        |  9 +++++++++
>  drivers/gpu/drm/nouveau/nouveau_encoder.h   |  1 +
>  3 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 94dfa2e5a9ab..d9c116cc11b9 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -635,6 +635,17 @@ nouveau_connector_detect(struct drm_connector *connector, bool force)
>         pm_runtime_mark_last_busy(dev->dev);
>         pm_runtime_put_autosuspend(dev->dev);
>
> +       if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> +           connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> +               enum drm_mode_subconnector subconnector = DRM_MODE_SUBCONNECTOR_Unknown;
> +
> +               if (conn_status == connector_status_connected && nv_encoder)
> +                       subconnector = nv_encoder->dp.subconnector;
> +               drm_object_property_set_value(&connector->base,
> +                       connector->dev->mode_config.dp_subconnector_property,
> +                       subconnector);
> +       }
> +
>         return conn_status;
>  }
>
> @@ -1359,6 +1370,8 @@ nouveau_connector_create(struct drm_device *dev,
>                         kfree(nv_connector);
>                         return ERR_PTR(ret);
>                 }
> +
> +               drm_mode_add_dp_subconnector_property(connector);
>                 funcs = &nouveau_connector_funcs;
>                 break;
>         default:
> diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
> index 2674f1587457..85eac853e3f8 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_dp.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
> @@ -62,6 +62,7 @@ nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
>         struct nouveau_drm *drm = nouveau_drm(dev);
>         struct nvkm_i2c_aux *aux;
>         u8 dpcd[8];
> +       u8 port_cap[DP_MAX_DOWNSTREAM_PORTS] = {};
>         int ret;
>
>         aux = nv_encoder->aux;
> @@ -72,6 +73,14 @@ nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
>         if (ret)
>                 return ret;
>
> +       if (dpcd[DP_DPCD_REV] > 0x10) {
> +               ret = nvkm_rdaux(aux, DP_DOWNSTREAM_PORT_0,
> +                                port_cap, DP_MAX_DOWNSTREAM_PORTS);
> +               if (ret)
> +                       memset(port_cap, 0, DP_MAX_DOWNSTREAM_PORTS);
> +       }
> +       nv_encoder->dp.subconnector = drm_dp_subconnector_type(dpcd, port_cap);
> +
>         nv_encoder->dp.link_bw = 27000 * dpcd[1];
>         nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h
> index 3517f920bf89..e17971a30221 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_encoder.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h
> @@ -63,6 +63,7 @@ struct nouveau_encoder {
>                         struct nv50_mstm *mstm;
>                         int link_nr;
>                         int link_bw;
> +                       enum drm_mode_subconnector subconnector;
>                 } dp;
>         };
>
> --
> 2.23.0
>
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