Unverified Commit 3b0a01a6 authored by Stefan Eichenberger's avatar Stefan Eichenberger Committed by Robert Foss
Browse files

drm/bridge: lt8912b: Add hot plug detection 



Enable hot plug detection when it is available on the HDMI port.
Without this connecting to a different monitor with incompatible timing
before the 10 seconds poll period will lead to a broken display output.

Fixes: 30e2ae94 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: default avatarStefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: default avatarFrancesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: default avatarAdrien Grassein <adrien.grassein@gmail.com>
Reviewed-by: default avatarRobert Foss <robert.foss@linaro.org>
Signed-off-by: default avatarRobert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221128112320.25708-1-francesco@dolcini.it
parent 8dc6de28

drivers/gpu/drm/bridge/lontium-lt8912b.c

+19 −2
Original line number Diff line number Diff line
@@ -517,14 +517,27 @@ static int lt8912_attach_dsi(struct lt8912 *lt) 
	return 0;

}



static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)

{

	struct lt8912 *lt = data;



	if (lt->bridge.dev)

		drm_helper_hpd_irq_event(lt->bridge.dev);

}



static int lt8912_bridge_connector_init(struct drm_bridge *bridge)

{

	int ret;

	struct lt8912 *lt = bridge_to_lt8912(bridge);

	struct drm_connector *connector = &lt->connector;



	if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) {

		drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt);

		connector->polled = DRM_CONNECTOR_POLL_HPD;

	} else {

		connector->polled = DRM_CONNECTOR_POLL_CONNECT |

				    DRM_CONNECTOR_POLL_DISCONNECT;

	}



	ret = drm_connector_init(bridge->dev, connector,

				 &lt8912_connector_funcs,
@@ -578,6 +591,10 @@ static void lt8912_bridge_detach(struct drm_bridge *bridge) 


	if (lt->is_attached) {

		lt8912_hard_power_off(lt);



		if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)

			drm_bridge_hpd_disable(lt->hdmi_port);



		drm_connector_unregister(&lt->connector);

		drm_connector_cleanup(&lt->connector);

	}