[PATCH i-g-t v10 31/49] tests/unigraf: Add basic unigraf tests

[Louis Chauvet <louis.chauvet@bootlin.com>]

Adds two tests to validate unigraf communication.

unigraf-connect checks if the device is connected and if the EDID is
properly applied.

ungiraf-reconnect checks if the device can be connected/reconnected
using SST and MST configurations.

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 tests/meson.build                    |   4 +
 tests/unigraf/meson.build            |  12 +++
 tests/unigraf/unigraf_connectivity.c | 138 +++++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+)

diff --git a/tests/meson.build b/tests/meson.build
index cecb4a8ae34a..4d3399d0eff4 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -475,6 +475,10 @@ foreach prog : intel_progs
 	endif
 endforeach
 
+if libtsi.found()
+	subdir('unigraf')
+endif
+
 if chamelium.found()
 	foreach prog : chamelium_progs
 		testexe = executable(prog,
diff --git a/tests/unigraf/meson.build b/tests/unigraf/meson.build
new file mode 100644
index 000000000000..4ef8c32151e4
--- /dev/null
+++ b/tests/unigraf/meson.build
@@ -0,0 +1,12 @@
+unigraf_progs = [
+	'unigraf_connectivity',
+]
+
+foreach prog : unigraf_progs
+	test_executables += executable(prog, prog + '.c',
+				       dependencies : test_deps,
+				       install_dir : unigrafdir,
+				       install_rpath : unigraf_rpathdir,
+				       install : true)
+	test_list += join_paths('unigraf', prog)
+endforeach
diff --git a/tests/unigraf/unigraf_connectivity.c b/tests/unigraf/unigraf_connectivity.c
new file mode 100644
index 000000000000..b35149a4de9a
--- /dev/null
+++ b/tests/unigraf/unigraf_connectivity.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2026 Google
+ *
+ * Authors:
+ *   Louis Chauvet <louis.chauvet@bootlin.com>
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <xf86drmMode.h>
+
+#include "drmtest.h"
+#include "igt_aux.h"
+#include "igt_core.h"
+#include "igt_kms.h"
+#include "unigraf/unigraf.h"
+
+/**
+ * TEST: unigraf connectivity
+ * Category: Core
+ * Description: Testing connectivity with a unigraf device
+ *
+ * SUBTEST: unigraf-connect-edid
+ * Description: Verify that the unigraf device is properly connected to the DUT
+ *              and that the correct EDID is detected and read.
+ *
+ * SUBTEST: unigraf-connect-mst
+ * Description: Ensure that the DUT can correctly detect and handle the unigraf device
+ *              when it is configured to operate in MST mode.
+ */
+
+IGT_TEST_DESCRIPTION("Test basic unigraf connectivity");
+int igt_main()
+{
+	int drm_fd;
+
+	igt_fixture() {
+		drm_fd = drm_open_driver_master(DRIVER_ANY);
+	}
+
+	igt_describe("Make sure that the unigraf device is connected to the DUT and EDID is properly detected");
+	igt_subtest("unigraf-connect-edid") {
+		drmModePropertyBlobPtr edid_blob = NULL;
+		struct igt_display display;
+		uint64_t edid_blob_id;
+		igt_output_t *output;
+		uint32_t unigraf_edid_len;
+		void *unigraf_edid;
+		bool found = false;
+
+		/*
+		 * Sleep are required to allow hardware to configure/detect the current
+		 * configuration
+		 */
+		unigraf_require_device(drm_fd);
+		unigraf_hpd_deassert();
+		sleep(igt_default_display_detect_timeout());
+		unigraf_set_sst();
+		unigraf_hpd_assert();
+		sleep(igt_default_display_detect_timeout());
+		igt_display_require(&display, drm_fd);
+		sleep(igt_default_display_detect_timeout());
+
+		unigraf_edid = unigraf_read_edid(0, &unigraf_edid_len);
+
+		for_each_connected_output(&display, output) {
+			if (output->config.connector->connector_type ==
+			    DRM_MODE_CONNECTOR_DisplayPort) {
+				igt_assert(kmstest_get_property(drm_fd,
+								output->config.connector->connector_id,
+								DRM_MODE_OBJECT_CONNECTOR, "EDID",
+								NULL, &edid_blob_id, NULL));
+				edid_blob = drmModeGetPropertyBlob(drm_fd, edid_blob_id);
+				if (!edid_blob)
+					continue;
+
+				if (!memcmp(unigraf_edid, edid_blob->data,
+					    min(edid_blob->length, unigraf_edid_len)))
+					found = true;
+
+				drmModeFreePropertyBlob(edid_blob);
+
+				if (found)
+					break;
+			}
+		}
+		igt_assert_f(found, "No output with the correct EDID was found\n");
+
+		free(unigraf_edid);
+	}
+
+	igt_describe("Make sure that the unigraf device can be used as a MST device");
+	igt_subtest("unigraf-connect-mst") {
+		int newly_connected_count, already_connected_count, diff_len;
+		uint32_t *newly_connected = NULL, *already_connected = NULL, *diff = NULL;
+		int max_count;
+
+		unigraf_require_device(drm_fd);
+		max_count = unigraf_get_mst_stream_max_count();
+
+		unigraf_hpd_deassert();
+
+		already_connected_count = igt_get_connected_connectors(drm_fd, &already_connected);
+
+		igt_debug("Already connected count: %d\n", already_connected_count);
+
+		// i = 0 is SST so we need to process max_count + 1 streams
+		for (int i = 0; i <= max_count; i++) {
+			unigraf_hpd_deassert();
+			// Let the hardware detect the new state
+			sleep(igt_default_display_detect_timeout());
+
+			unigraf_set_mst_stream_count(max(i, 1));
+			if (!i)
+				unigraf_set_sst();
+			else
+				unigraf_set_mst();
+
+			unigraf_hpd_assert();
+			// Let the hardware detect the new state
+			sleep(igt_default_display_detect_timeout());
+
+			newly_connected_count = kms_wait_for_new_connectors(&newly_connected,
+									    already_connected,
+									    already_connected_count,
+									    drm_fd);
+
+			diff_len = get_array_diff(newly_connected, newly_connected_count,
+						  already_connected, already_connected_count, &diff);
+
+			igt_assert_f(diff_len == max(i, 1),
+				     "Invalid connected connector count, expected %d found %d\n",
+				     max(i, 1), diff_len);
+		}
+	}
+}

-- 
2.52.0