[PATCH i-g-t 02/14] lib/igt_kms: add helper to get current link rate/ lane count for connector

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

i915_dp_force_(lane_count/link_rate) debugfs files expoose
current link rate/lane count for connector.add helper to get
current link rate/ lane count for connector

Signed-off-by: Kunal Joshi <kunal1.joshi@intel.com>
---
 lib/igt_kms.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  2 ++
 2 files changed, 60 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index dd530dbab..4ef7f4d7f 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6705,3 +6705,61 @@ int get_num_scalers(igt_display_t *display, enum pipe pipe)
 
 	return num_scalers;
 }
+
+/**
+ * igt_get_dp_link_rate_set_for_output:
+ * @drm_fd: A drm file descriptor
+ * @output: Target output
+ *
+ * Returns: Link rate set for the output.
+ */
+enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t *output)
+{
+	char buf[512];
+	int dir, res;
+	int link_rate;
+
+	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_rate", buf, sizeof(buf));
+	close(dir);
+	igt_require(res > 0);
+
+	if (strstr(buf, "[auto]"))
+		igt_assert(sscanf(strstr(buf, "*") - 6, "%d", &link_rate) == 1);
+	else
+		igt_assert(sscanf(strstr(buf, "[") + 1, "%d", &link_rate) == 1);
+
+	return link_rate;
+}
+
+/**
+ * igt_get_dp_lane_count_set_for_output:
+ * @drm_fd: A drm file descriptor
+ * @output: Target output
+ *
+ * Returns: Lane count set for the output.
+ */
+enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output)
+{
+	char buf[512];
+	int dir, res;
+	int lane_count;
+
+	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_lane_count", buf, sizeof(buf));
+	close(dir);
+	igt_require(res > 0);
+
+	if (strstr(buf, "[auto]"))
+		igt_assert(sscanf(strstr(buf, "*") - 2, "%d", &lane_count) == 1);
+	else
+		igt_assert(sscanf(strstr(buf, "[") + 1, "%d", &lane_count) == 1);
+
+	return lane_count;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 999921f9f..9d42a2b35 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1247,5 +1247,7 @@ bool intel_pipe_output_combo_valid(igt_display_t *display);
 bool igt_check_output_is_dp_mst(igt_output_t *output);
 int igt_get_dp_mst_connector_id(igt_output_t *output);
 int get_num_scalers(igt_display_t *display, enum pipe pipe);
+enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t *output);
+enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output);
 
 #endif /* __IGT_KMS_H__ */
-- 
2.43.0