[i-g-t V4 2/7] lib/igt_kms: New helper to check force joiner status

[Bhanuprakash Modem <bhanuprakash.modem@intel.com>]

Add a new function to check the force joiner status
on selected connecter, so that it would be helpful to
check the force joiner status from other places too.

V2: - Add few debug prints
V3: - Rebase

Cc: Kunal Joshi <kunal1.joshi@intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
---
 lib/igt_kms.c | 34 ++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index b36f19843..f47d85977 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6340,6 +6340,40 @@ bool igt_has_force_joiner_debugfs(int drmfd, char *conn_name)
 	return ret >= 0;
 }
 
+/**
+ * igt_check_force_joiner_status
+ * @drmfd: file descriptor of the DRM device.
+ * @connector_name: connector to check.
+ *
+ * Checks if the force big joiner is enabled.
+ *
+ * Returns: True if the force big joiner is enabled, False otherwise.
+ */
+bool igt_check_force_joiner_status(int drmfd, char *connector_name)
+{
+	char buf[512];
+	int debugfs_fd, ret;
+
+	if (!connector_name)
+		return false;
+
+	debugfs_fd = igt_debugfs_connector_dir(drmfd, connector_name, O_RDONLY);
+	if (debugfs_fd < 0) {
+		igt_debug("Could not open debugfs for connector: %s\n", connector_name);
+		return false;
+	}
+
+	ret = igt_debugfs_simple_read(debugfs_fd, "i915_bigjoiner_force_enable", buf, sizeof(buf));
+	close(debugfs_fd);
+
+	if (ret < 0) {
+		igt_debug("Could not read i915_bigjoiner_force_enable for connector: %s\n", connector_name);
+		return false;
+	}
+
+	return strstr(buf, "Y");
+}
+
 /**
  * igt_check_bigjoiner_support:
  * @display: a pointer to an #igt_display_t structure
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 979cf1300..501d48763 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1216,6 +1216,7 @@ bool igt_bigjoiner_possible(drmModeModeInfo *mode, int max_dotclock);
 bool bigjoiner_mode_found(int drm_fd, drmModeConnector *connector,
 			  int max_dotclock, drmModeModeInfo *mode);
 bool igt_has_force_joiner_debugfs(int drmfd, char *conn_name);
+bool igt_check_force_joiner_status(int drmfd, char *connector_name);
 bool igt_check_bigjoiner_support(igt_display_t *display);
 bool igt_parse_mode_string(const char *mode_string, drmModeModeInfo *mode);
 bool intel_pipe_output_combo_valid(igt_display_t *display);
-- 
2.43.2