[PATCH v6 15/16] drm/vkms: Allow to update the connector status

["José Expósito" <jose.exposito89@gmail.com>]

Implement the drm_connector_funcs.detect() callback to update the
connector status by returning the status stored in the configuration.

Tested-by: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
---
 drivers/gpu/drm/vkms/vkms_connector.c | 28 +++++++++++++++++++++++++++
 drivers/gpu/drm/vkms/vkms_connector.h |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_connector.c b/drivers/gpu/drm/vkms/vkms_connector.c
index 48b10cba322a..89fa8d9d739b 100644
--- a/drivers/gpu/drm/vkms/vkms_connector.c
+++ b/drivers/gpu/drm/vkms/vkms_connector.c
@@ -5,9 +5,37 @@
 #include <drm/drm_managed.h>
 #include <drm/drm_probe_helper.h>
 
+#include "vkms_config.h"
 #include "vkms_connector.h"
 
+static enum drm_connector_status vkms_connector_detect(struct drm_connector *connector,
+						       bool force)
+{
+	struct drm_device *dev = connector->dev;
+	struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
+	struct vkms_connector *vkms_connector;
+	enum drm_connector_status status;
+	struct vkms_config_connector *connector_cfg;
+
+	vkms_connector = drm_connector_to_vkms_connector(connector);
+
+	/*
+	 * The connector configuration might not exist if its configfs directory
+	 * was deleted. Therefore, use the configuration if present or keep the
+	 * current status if we can not access it anymore.
+	 */
+	status = connector->status;
+
+	vkms_config_for_each_connector(vkmsdev->config, connector_cfg) {
+		if (connector_cfg->connector == vkms_connector)
+			status = vkms_config_connector_get_status(connector_cfg);
+	}
+
+	return status;
+}
+
 static const struct drm_connector_funcs vkms_connector_funcs = {
+	.detect = vkms_connector_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.reset = drm_atomic_helper_connector_reset,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
diff --git a/drivers/gpu/drm/vkms/vkms_connector.h b/drivers/gpu/drm/vkms/vkms_connector.h
index c9149c1b7af0..90f835f70b3b 100644
--- a/drivers/gpu/drm/vkms/vkms_connector.h
+++ b/drivers/gpu/drm/vkms/vkms_connector.h
@@ -5,6 +5,9 @@
 
 #include "vkms_drv.h"
 
+#define drm_connector_to_vkms_connector(target) \
+	container_of(target, struct vkms_connector, base)
+
 /**
  * struct vkms_connector - VKMS custom type wrapping around the DRM connector
  *
-- 
2.51.0