Re: [PATCH v5 2/8] drm/connector: pass down IRQ_HPD to the drivers

[Chaoyi Chen]

Hi Dmitry,

On 9/20/2026 11:01 PM, Dmitry Baryshkov wrote:
> The DisplayPort standard defines a special kind of HPD events called
> IRQ_HPD. These events are used to notify DP Source about the events on
> the Sink side.
> 
> Extend drm_connector_funcs::oob_hotplug_event() to pass the
> notifications about the IRQ_HPD events down to the individual drivers,
> letting them handle those as required.
> 
> Reviewed-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
> Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/display/drm_bridge_connector.c | 17 ++++++++++-------
>  drivers/gpu/drm/drm_connector.c                |  2 +-
>  drivers/gpu/drm/i915/display/intel_dp.c        |  3 ++-
>  include/drm/drm_connector.h                    |  3 ++-
>  4 files changed, 15 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
> index 00feb73e63d7..a51567d19550 100644
> --- a/drivers/gpu/drm/display/drm_bridge_connector.c
> +++ b/drivers/gpu/drm/display/drm_bridge_connector.c
> @@ -141,7 +141,8 @@ struct drm_bridge_connector {
>   */
>  
>  static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
> -					    enum drm_connector_status status)
> +					    enum drm_connector_status status,
> +					    enum drm_connector_dp_event event)
>  {
>  	struct drm_bridge_connector *bridge_connector =
>  		to_drm_bridge_connector(connector);
> @@ -154,7 +155,8 @@ static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
>  }
>  

It looks like you only changed the function signature. 
Don't the "bridge->funcs->hpd_notify" inside this function need to pass the event?

	drm_for_each_bridge_in_chain_scoped(bridge_connector->encoder, bridge) {
		if (bridge->funcs->hpd_notify)
			bridge->funcs->hpd_notify(bridge, connector, status);
	}


>  static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bridge_connector,
> -					    enum drm_connector_status status)
> +					    enum drm_connector_status status,
> +					    enum drm_connector_dp_event event)
>  {
>  	struct drm_connector *connector = &drm_bridge_connector->base;
>  	struct drm_device *dev = connector->dev;
> @@ -163,7 +165,7 @@ static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bri
>  	connector->status = status;
>  	mutex_unlock(&dev->mode_config.mutex);
>  
> -	drm_bridge_connector_hpd_notify(connector, status);
> +	drm_bridge_connector_hpd_notify(connector, status, event);
>  
>  	drm_kms_helper_connector_hotplug_event(connector);
>  }
> @@ -171,16 +173,17 @@ static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bri
>  static void drm_bridge_connector_hpd_cb(void *cb_data,
>  					enum drm_connector_status status)
>  {
> -	drm_bridge_connector_handle_hpd(cb_data, status);
> +	drm_bridge_connector_handle_hpd(cb_data, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
>  }
>  
>  static void drm_bridge_connector_oob_hotplug_event(struct drm_connector *connector,
> -						   enum drm_connector_status status)
> +						   enum drm_connector_status status,
> +						   enum drm_connector_dp_event event)
>  {
>  	struct drm_bridge_connector *bridge_connector =
>  		to_drm_bridge_connector(connector);
>  
> -	drm_bridge_connector_handle_hpd(bridge_connector, status);
> +	drm_bridge_connector_handle_hpd(bridge_connector, status, event);
>  }
>  
>  static void drm_bridge_connector_enable_hpd(struct drm_connector *connector)
> @@ -223,7 +226,7 @@ drm_bridge_connector_detect(struct drm_connector *connector, bool force)
>  		if (hdmi)
>  			drm_atomic_helper_connector_hdmi_hotplug(connector, status);
>  
> -		drm_bridge_connector_hpd_notify(connector, status);
> +		drm_bridge_connector_hpd_notify(connector, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
>  	} else {
>  		switch (connector->connector_type) {
>  		case DRM_MODE_CONNECTOR_DPI:
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 5d4945ea1e95..f0facccb7859 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -3698,7 +3698,7 @@ void drm_connector_dp_oob_status(struct fwnode_handle *connector_fwnode,
>  		return;
>  
>  	if (connector->funcs->oob_hotplug_event)
> -		connector->funcs->oob_hotplug_event(connector, status);
> +		connector->funcs->oob_hotplug_event(connector, status, event);
>  
>  	drm_connector_put(connector);
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 50ed615cf0f6..a2acff240b45 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6800,7 +6800,8 @@ static int intel_dp_connector_atomic_check(struct drm_connector *_connector,
>  }
>  
>  static void intel_dp_oob_hotplug_event(struct drm_connector *_connector,
> -				       enum drm_connector_status hpd_state)
> +				       enum drm_connector_status hpd_state,
> +				       enum drm_connector_dp_event event)
>  {
>  	struct intel_connector *connector = to_intel_connector(_connector);
>  	struct intel_display *display = to_intel_display(connector);
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 906aaefca7e1..c3374cd2598e 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1884,7 +1884,8 @@ struct drm_connector_funcs {
>  	 * has been received from a source outside the display driver / device.
>  	 */
>  	void (*oob_hotplug_event)(struct drm_connector *connector,
> -				  enum drm_connector_status status);
> +				  enum drm_connector_status status,
> +				  enum drm_connector_dp_event event);
>  
>  	/**
>  	 * @debugfs_init:
> 

-- 
Best, 
Chaoyi