[PATCH i-g-t 5/9] lib/igt_kms: add function to force link retrain
Kunal Joshi
kunal1.joshi at intel.com
Sun Jun 9 21:25:31 UTC 2024
[1] exposes interface which can be utilized to apply previously
set link rate/lane count or force link training failures
[1] https://patchwork.freedesktop.org/patch/594772/?series=133624&rev=3
Signed-off-by: Kunal Joshi <kunal1.joshi at intel.com>
---
lib/igt_kms.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
lib/igt_kms.h | 2 ++
2 files changed, 46 insertions(+)
diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 91cc5a347..1bd6c31a7 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6744,6 +6744,50 @@ bool kmstest_force_connector_link_training_failure(int drm_fd, drmModeConnector
return true;
}
+static bool force_connector_retrain(int drm_fd,
+ drmModeConnector *connector,
+ const char *value)
+{
+ return connector_attr_set_debugfs(drm_fd, connector,
+ "i915_dp_force_link_retrain",
+ value, "0");
+}
+
+/**
+ * kmstest_force_connector_force_retrain:
+ * @fd: drm file descriptor
+ * @connector: connector
+ *
+ * Force retraining on the specified connector
+ * and install exit handler for resetting
+ *
+ * Returns: True on success
+ */
+bool kmstest_force_connector_retrain(int drm_fd, drmModeConnector *connector, int retrain_count)
+{
+ char value[2];
+ drmModeConnector *temp;
+
+ if (!is_intel_device(drm_fd))
+ return false;
+
+ snprintf(value, sizeof(value), "%d", retrain_count);
+ if (!force_connector_retrain(drm_fd, connector, value))
+ return false;
+
+ dump_connector_attrs();
+ igt_install_exit_handler(reset_connectors_at_exit);
+
+ /*
+ * To allow callers to always use GetConnectorCurrent we need to force a
+ * redetection here.
+ */
+ temp = drmModeGetConnector(drm_fd, connector->connector_id);
+ drmModeFreeConnector(temp);
+
+ return true;
+}
+
/**
* igt_get_dp_link_rate_set_for_output:
* @drm_fd: A drm file descriptor
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 5b4afec87..d58676a1e 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -302,6 +302,8 @@ bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector,
int link_rate);
bool kmstest_force_connector_link_training_failure(int drm_fd, drmModeConnector *connector,
int train_count);
+bool kmstest_force_connector_retrain(int drm_fd, drmModeConnector *connector,
+ int retrain_count);
bool kmstest_get_connector_default_mode(int drm_fd, drmModeConnector *connector,
drmModeModeInfo *mode);
--
2.43.0
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