[PATCH i-g-t 09/14] lib/igt_kms: add helper to get pending retrain count

[Kunal Joshi]

i915_dp_force_link_retrain can be written to trigger
link retraining. add helper to get pending retrainig
failure count.

Signed-off-by: Kunal Joshi <kunal1.joshi at intel.com>
---
 lib/igt_kms.c | 23 +++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 727fa83f1..91f75243d 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6941,3 +6941,26 @@ int igt_get_dp_pending_lt_failures(int drm_fd, igt_output_t *output)
 	sscanf(buf, "%d", &ret);
 	return ret;
 }
+
+/**
+ * igt_dp_pending_retrain:
+ * @drm_fd: A drm file descriptor
+ * @output: Target output
+ * 
+ * Returns: Number of pending link retrains.
+ */
+int igt_get_dp_pending_retrain(int drm_fd, igt_output_t *output)
+{
+	int dir, res, ret;
+	char buf[512];
+
+	igt_require_f(output->name, "Invalid output");
+	dir = igt_debugfs_connector_dir(drm_fd, output->name, O_RDONLY);
+	igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n",
+			       igt_output_name(output));
+	res = igt_debugfs_simple_read(dir, "i915_dp_force_link_retrain", buf, sizeof(buf));
+	close(dir);
+	igt_require(res > 0);
+	sscanf(buf, "%d", &ret);
+	return ret;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 07dbcb263..640ec4e09 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1256,5 +1256,6 @@ void igt_force_lt_failure(int drm_fd, igt_output_t *output, int failure_count);
 bool igt_get_dp_link_retrain_disabled(int drm_fd, igt_output_t *output);
 bool igt_has_force_link_training_failure_debugfs(int drmfd, igt_output_t *output);
 int igt_get_dp_pending_lt_failures(int drm_fd, igt_output_t *output);
+int igt_get_dp_pending_retrain(int drm_fd, igt_output_t *output);
 
 #endif /* __IGT_KMS_H__ */
-- 
2.34.1