[PATCH i-g-t 2/4] lib/igt_kms: add helpers to enable/disable force joiner

[Kunal Joshi]

add helped to enable/disable force joiner and for
checking current state enabled/disabled

Cc: Karthik B S <karthik.b.s at intel.com>
Cc: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
Signed-off-by: Kunal Joshi <kunal1.joshi at intel.com>
---
 lib/igt_kms.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h |  2 ++
 2 files changed, 50 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 89956b9d5..e6952f56a 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6242,6 +6242,54 @@ bool igt_check_bigjoiner_support(igt_display_t *display)
 	return true;
 }
 
+/**
+ * Checks if the force big joiner is enabled for a specific connector.
+ *
+ * @param drmfd The file descriptor of the DRM device.
+ * @param connector_name The name of the connector.
+ * Returns:
+ *  1 if the force big joiner is enabled, 0 if disabled, and -1 on error.
+ */
+int igt_check_force_bigjoiner_status(int drmfd, char *connector_name)
+{
+	char buf[512];
+	int debugfs_fd, ret;
+
+	debugfs_fd = igt_debugfs_connector_dir(drmfd, connector_name, O_RDONLY);
+	ret = igt_debugfs_simple_read(debugfs_fd, "i915_bigjoiner_force_enable",
+								  buf, sizeof(buf));
+	if (ret < 0) {
+		igt_info("Could not read debugfs %s\n",
+				 strerror(-ret));
+		return -1;
+	}
+	if (strstr(buf, "Bigjoiner enable: 1"))
+		return 1;
+	else if (strstr(buf, "Bigjoiner enable: 0"))
+		return 0;
+	else
+		return -1;
+}
+
+/**
+ * Forces the enable/disable state of big joiner for a specific connector.
+ *
+ * @param drmfd The file descriptor of the DRM device.
+ * @param connector_name The name of the connector.
+ * @param enable The desired state of big joiner (true for enable, false for disable).
+ * Returns:
+ *  >=0 on success, otherwise an error code.
+ */
+int igt_force_bigjoiner_enable(int drmfd, char *connector_name, bool enable)
+{
+	int debugfs_fd, ret;
+
+	debugfs_fd = igt_debugfs_connector_dir(drmfd, connector_name, O_DIRECTORY);
+	ret = igt_sysfs_write(debugfs_fd, "i915_bigjoiner_force_enable", enable ? "1" : "0", 1);
+	close(debugfs_fd);
+	return ret;
+}
+
 /**
  * igt_parse_mode_string:
  * @mode_string: modeline string
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index bab8487d3..b28022db4 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1215,6 +1215,8 @@ bool igt_bigjoiner_possible(drmModeModeInfo *mode, int max_dotclock);
 bool bigjoiner_mode_found(int drm_fd, drmModeConnector *connector,
 			  int max_dotclock);
 bool igt_check_bigjoiner_support(igt_display_t *display);
+int igt_check_force_bigjoiner_status(int drmfd, char *connector_name);
+int igt_force_bigjoiner_enable(int drmfd, char *connector_name, bool enable);
 bool igt_parse_mode_string(const char *mode_string, drmModeModeInfo *mode);
 bool intel_pipe_output_combo_valid(igt_display_t *display);
 bool igt_check_output_is_dp_mst(igt_output_t *output);
-- 
2.25.1