[PATCH v3 14/16] drm/vkms: Introduce config for connector status

[Louis Chauvet]

VKMS driver does not currently support connector hotpluging. Add
an option to change the connector status once a device is created.

Signed-off-by: José Expósito <jose.exposito89 at gmail.com>
[adpated it for my implementation]
Signed-off-by: Louis Chauvet <louis.chauvet at bootlin.com>
---
 drivers/gpu/drm/vkms/vkms_config.c | 10 ++++++++++
 drivers/gpu/drm/vkms/vkms_config.h |  4 ++++
 drivers/gpu/drm/vkms/vkms_output.c | 24 ++++++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c
index 57e211e48a90d3a4d7f8677c40a2b35d44b847e5..5eba4284269d058f12f78ddba96cb40215e85f72 100644
--- a/drivers/gpu/drm/vkms/vkms_config.c
+++ b/drivers/gpu/drm/vkms/vkms_config.c
@@ -2,6 +2,7 @@
 
 #include <kunit/visibility.h>
 #include <drm/drm_debugfs.h>
+#include <drm/drm_probe_helper.h>
 
 #include "vkms_config.h"
 #include "vkms_drv.h"
@@ -160,10 +161,19 @@ struct vkms_config_connector *vkms_config_create_connector(struct vkms_config *v
 	list_add(&vkms_config_connector->link, &vkms_config->connectors);
 	xa_init_flags(&vkms_config_connector->possible_encoders, XA_FLAGS_ALLOC);
 	vkms_config_connector->type = DRM_MODE_CONNECTOR_VIRTUAL;
+	vkms_config_connector->status = connector_status_unknown;
 
 	return vkms_config_connector;
 }
 
+void vkms_config_connector_update_status(struct vkms_config_connector *vkms_config_connector,
+					 enum drm_connector_status status)
+{
+	vkms_config_connector->status = status;
+	if (vkms_config_connector->connector)
+		drm_kms_helper_hotplug_event(vkms_config_connector->connector->dev);
+}
+
 struct vkms_config_crtc *vkms_config_create_crtc(struct vkms_config *vkms_config)
 {
 	if (!vkms_config)
diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h
index 72bfaadd4322f9e1607a6b9425fb8aaf8bd9d5f6..8e0c9b753821f75f10b3090743905471d0abac36 100644
--- a/drivers/gpu/drm/vkms/vkms_config.h
+++ b/drivers/gpu/drm/vkms/vkms_config.h
@@ -103,11 +103,15 @@ struct vkms_config_connector {
 
 	struct xarray possible_encoders;
 	int type;
+	enum drm_connector_status status;
 
 	/* Internal usage */
 	struct drm_connector *connector;
 };
 
+void vkms_config_connector_update_status(struct vkms_config_connector *vkms_config_connector,
+					 enum drm_connector_status status);
+
 /**
  * vkms_config_register_debugfs() - Register the debugfs file to display current configuration
  */
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index 50aa802da479e5ba383e5db49dc2c7c6981f0bef..75d90df44da3b6dd3ed3ae104a6bc6d51c9bf089 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -7,9 +7,33 @@
 #include <drm/drm_managed.h>
 #include <drm/drm_probe_helper.h>
 
+static struct vkms_config_connector *vkms_config_connector_from_vkms_connector(struct drm_connector *connector)
+{
+	struct vkms_device *vkms_device = drm_device_to_vkms_device(connector->dev);
+	struct vkms_config_connector *connector_cfg;
+
+	list_for_each_entry(connector_cfg, &vkms_device->config->connectors, link) {
+		if (connector_cfg->connector == connector)
+			return connector_cfg;
+	}
+	return NULL;
+}
+
+static enum drm_connector_status vkms_connector_detect(struct drm_connector *connector, bool force)
+{
+	enum drm_connector_status status = connector->status;
+	struct vkms_config_connector *connector_cfg = vkms_config_connector_from_vkms_connector(connector);
+
+	if (connector_cfg)
+		status = connector_cfg->status;
+
+	return status;
+}
+
 static const struct drm_connector_funcs vkms_connector_funcs = {
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.reset = drm_atomic_helper_connector_reset,
+	.detect = vkms_connector_detect,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

-- 
2.47.1