linux-kernel - [PATCH v7 3/3 RESEND] drm/bridge_connector: implement oob_hotplug

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Date:   Mon,  9 Oct 2023 20:40:48 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Simon Ser <contact@...rsion.fr>, Janne Grunau <j@...nau.net>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-usb@...r.kernel.org
Subject: [PATCH v7 3/3 RESEND] drm/bridge_connector: implement oob_hotplug_event

Implement the oob_hotplug_event() callback. Translate it to the HPD
notification sent to the HPD bridge in the chain.

Reviewed-by: Janne Grunau <j@...nau.net>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/drm_bridge_connector.c | 31 +++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
index 70582491d955..8239ad43aed5 100644
--- a/drivers/gpu/drm/drm_bridge_connector.c
+++ b/drivers/gpu/drm/drm_bridge_connector.c
@@ -5,6 +5,8 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 
 #include <drm/drm_atomic_state_helper.h>
@@ -107,10 +109,9 @@ static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
 	}
 }
 
-static void drm_bridge_connector_hpd_cb(void *cb_data,
-					enum drm_connector_status status)
+static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bridge_connector,
+					    enum drm_connector_status status)
 {
-	struct drm_bridge_connector *drm_bridge_connector = cb_data;
 	struct drm_connector *connector = &drm_bridge_connector->base;
 	struct drm_device *dev = connector->dev;
 
@@ -123,6 +124,21 @@ static void drm_bridge_connector_hpd_cb(void *cb_data,
 	drm_kms_helper_connector_hotplug_event(connector);
 }
 
+static void drm_bridge_connector_hpd_cb(void *cb_data,
+					enum drm_connector_status status)
+{
+	drm_bridge_connector_handle_hpd(cb_data, status);
+}
+
+static void drm_bridge_connector_oob_hotplug_event(struct drm_connector *connector,
+						   enum drm_connector_status status)
+{
+	struct drm_bridge_connector *bridge_connector =
+		to_drm_bridge_connector(connector);
+
+	drm_bridge_connector_handle_hpd(bridge_connector, status);
+}
+
 static void drm_bridge_connector_enable_hpd(struct drm_connector *connector)
 {
 	struct drm_bridge_connector *bridge_connector =
@@ -191,6 +207,8 @@ static void drm_bridge_connector_destroy(struct drm_connector *connector)
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 
+	fwnode_handle_put(connector->fwnode);
+
 	kfree(bridge_connector);
 }
 
@@ -216,6 +234,7 @@ static const struct drm_connector_funcs drm_bridge_connector_funcs = {
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 	.debugfs_init = drm_bridge_connector_debugfs_init,
+	.oob_hotplug_event = drm_bridge_connector_oob_hotplug_event,
 };
 
 /* -----------------------------------------------------------------------------
@@ -352,6 +371,12 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 		if (!drm_bridge_get_next_bridge(bridge))
 			connector_type = bridge->type;
 
+#ifdef CONFIG_OF
+		if (!drm_bridge_get_next_bridge(bridge) &&
+		    bridge->of_node)
+			connector->fwnode = fwnode_handle_get(of_fwnode_handle(bridge->of_node));
+#endif
+
 		if (bridge->ddc)
 			ddc = bridge->ddc;
 
-- 
2.39.2