[igt-dev] [PATCH i-g-t 1/4] lib/igt_kms: add helper to check if output is mst

[Swati Sharma <swati2.sharma@intel.com>]

Helper is added to check if output is mst or not.

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
 lib/igt_kms.c | 21 +++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index f2b0eed57..6034ff70c 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6029,3 +6029,24 @@ bool i915_pipe_output_combo_valid(igt_display_t *display)
 	 */
 	return igt_check_bigjoiner_support(display);
 }
+
+/**
+ * igt_check_output_is_dp_mst
+ * @drmfd: Handle to open drm device
+ * @output: Target output
+ *
+ * Returns: true if output is dp-mst, else false.
+ */
+bool igt_check_output_is_dp_mst(int drm_fd, igt_output_t *output)
+{
+	struct kmstest_connector_config config;
+	const char *encoder;
+
+	kmstest_get_connector_config(drm_fd, output->config.connector->connector_id, -1, &config);
+	encoder = kmstest_encoder_type_str(config.encoder->encoder_type);
+
+	if (strcmp(encoder, "DP MST"))
+		return false;
+
+	return true;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 1b6988c17..9a46e7a5c 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1004,5 +1004,6 @@ bool igt_bigjoiner_possible(drmModeModeInfo *mode, int max_dotclock);
 bool igt_check_bigjoiner_support(igt_display_t *display);
 bool igt_parse_mode_string(const char *mode_string, drmModeModeInfo *mode);
 bool i915_pipe_output_combo_valid(igt_display_t *display);
+bool igt_check_output_is_dp_mst(int drmfd, igt_output_t *output);
 
 #endif /* __IGT_KMS_H__ */
-- 
2.25.1