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SubjectRe: [PATCH 2/4] drm/bridge-connector: handle subconnector types
On 29/07/2023 02:49, Dmitry Baryshkov wrote:
> If the created connector type supports subconnector type property,
> create and attach corresponding it. The default subtype value is 0,
> which maps to the DRM_MODE_SUBCONNECTOR_Unknown type.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
> drivers/gpu/drm/drm_bridge_connector.c | 33 +++++++++++++++++++++++++-
> include/drm/drm_bridge.h | 4 ++++
> 2 files changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
> index 07b5930b1282..a7b92f0d2430 100644
> --- a/drivers/gpu/drm/drm_bridge_connector.c
> +++ b/drivers/gpu/drm/drm_bridge_connector.c
> @@ -329,7 +329,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
> struct drm_connector *connector;
> struct i2c_adapter *ddc = NULL;
> struct drm_bridge *bridge, *panel_bridge = NULL;
> + enum drm_mode_subconnector subconnector;
> int connector_type;
> + int ret;
>
> bridge_connector = kzalloc(sizeof(*bridge_connector), GFP_KERNEL);
> if (!bridge_connector)
> @@ -365,8 +367,10 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
> if (bridge->ops & DRM_BRIDGE_OP_MODES)
> bridge_connector->bridge_modes = bridge;
>
> - if (!drm_bridge_get_next_bridge(bridge))
> + if (!drm_bridge_get_next_bridge(bridge)) {
> connector_type = bridge->type;
> + subconnector = bridge->subtype;
> + }
>
> #ifdef CONFIG_OF
> if (!drm_bridge_get_next_bridge(bridge) &&
> @@ -399,6 +403,33 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
> if (panel_bridge)
> drm_panel_bridge_set_orientation(connector, panel_bridge);
>
> + if (connector_type == DRM_MODE_CONNECTOR_DisplayPort) {
> + drm_connector_attach_dp_subconnector_property(connector, subconnector);
> + } else if (connector_type == DRM_MODE_CONNECTOR_DVII) {
> + ret = drm_mode_create_dvi_i_properties(drm);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + drm_object_attach_property(&connector->base,
> + drm->mode_config.dvi_i_subconnector_property,
> + subconnector);
> + } else if (connector_type == DRM_MODE_CONNECTOR_TV) {
> + ret = drm_mode_create_tv_properties(drm,
> + BIT(DRM_MODE_TV_MODE_NTSC) |
> + BIT(DRM_MODE_TV_MODE_NTSC_443) |
> + BIT(DRM_MODE_TV_MODE_NTSC_J) |
> + BIT(DRM_MODE_TV_MODE_PAL) |
> + BIT(DRM_MODE_TV_MODE_PAL_M) |
> + BIT(DRM_MODE_TV_MODE_PAL_N) |
> + BIT(DRM_MODE_TV_MODE_SECAM));
> + if (ret)
> + return ERR_PTR(ret);

I don't think this is right, this should be called from the appropriate encoder
device depending on the analog tv mode capabilities.


> +
> + drm_object_attach_property(&connector->base,
> + drm->mode_config.tv_subconnector_property,
> + subconnector);

Here, only add the property if drm->mode_config.tv_subconnector_property exists,
and perhaps add a warning if not.

AFAIK same for DRM_MODE_CONNECTOR_DVII.

> + }
> +
> return connector;
> }
> EXPORT_SYMBOL_GPL(drm_bridge_connector_init);
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index bf964cdfb330..68b14ac5ac0d 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -739,6 +739,10 @@ struct drm_bridge {
> * identifies the type of connected display.
> */
> int type;
> + /**
> + * @subtype: the subtype of the connector for the DP/TV/DVI-I cases.
> + */
> + enum drm_mode_subconnector subtype;
> /**
> * @interlace_allowed: Indicate that the bridge can handle interlaced
> * modes.

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