[PATCH i-g-t 10/14] lib/igt_kms: add helper to set connector link status

[Kunal Joshi <kunal1.joshi@intel.com>]

add helper to set connector's link status property

Signed-off-by: Kunal Joshi <kunal1.joshi@intel.com>
---
 lib/igt_kms.c | 36 ++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  2 ++
 2 files changed, 38 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 91f75243d..e0533f6ae 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -2213,6 +2213,42 @@ void kmstest_set_connector_dpms(int fd, drmModeConnector *connector, int mode)
 					       dpms, mode) == 0);
 }
 
+/**
+ * kmstest_set_connector_link_status
+ * @drm_fd: drm file descriptor
+ * @connector: libdrm connector
+ * @link_status: DRM link status value
+ * 
+ * This function sets the link status of @connector to @link_status.
+ */
+void kmstest_set_connector_link_status(int drm_fd, drmModeConnector *connector,
+				       int link_status)
+{
+	int i, link_status_prop = 0;
+	bool found_it = false;
+
+	for (i = 0; i < connector->count_props; i++) {
+		struct drm_mode_get_property prop = {
+			.prop_id = connector->props[i],
+		};
+
+		if (drmIoctl(drm_fd, DRM_IOCTL_MODE_GETPROPERTY, &prop))
+			continue;
+
+		if (strcmp(prop.name, "link-status"))
+			continue;
+
+		link_status_prop = prop.prop_id;
+		found_it = true;
+		break;
+	}
+	igt_assert_f(found_it, "LINK_STATUS property not found on %d\n",
+		     connector->connector_id);
+
+	igt_assert(drmModeConnectorSetProperty(drm_fd, connector->connector_id,
+					       link_status_prop, link_status) == 0);
+}
+
 /**
  * kmstest_get_property:
  * @drm_fd: drm file descriptor
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 640ec4e09..3d7842b36 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -301,6 +301,8 @@ bool kmstest_probe_connector_config(int drm_fd, uint32_t connector_id,
 void kmstest_free_connector_config(struct kmstest_connector_config *config);
 
 void kmstest_set_connector_dpms(int fd, drmModeConnector *connector, int mode);
+void kmstest_set_connector_link_status(int drm_fd, drmModeConnector *connector,
+				       int link_status);
 bool kmstest_get_property(int drm_fd, uint32_t object_id, uint32_t object_type,
 			  const char *name, uint32_t *prop_id, uint64_t *value,
 			  drmModePropertyPtr *prop);
-- 
2.43.0