[igt-dev] [PATCH i-g-t] tests/kms_chamelium: Check if port adapters are in use

[Ryszard Knop]

If a DUT has Chamelium ports connected via an adapter (for example, DP
on the Chamelium side -> DP-HDMI adapter -> HDMI on the DUT), this will
usually cause many tests to fail. If mismatching port types are found
on both sides, the tests will now be aborted with a warning.

This behavior can be overridden with a new AdapterAllowed config value,
which must be set in [Chamelium:PORT] blocks in .igtrc.
---
 docs/chamelium.txt  | 18 ++++++++++++++----
 lib/igt_chamelium.c | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/docs/chamelium.txt b/docs/chamelium.txt
index 32c296f7..7484a3f8 100644
--- a/docs/chamelium.txt
+++ b/docs/chamelium.txt
@@ -94,7 +94,8 @@ example (only Chamelium.URL is mandatory):
     URL=http://192.168.1.2:9992
 
     # The rest of the sections are used for defining connector mappings. This
-    # is optional, the mappings will be discovered automatically.
+    # is optional if the same connector type (ex. DP-DP) is used on both sides,
+    # the mappings will be discovered automatically.
 
     # The name of the DRM connector
     # The DP-1 of [Chamelium:DP-1] and the HDMI-A-1 of [Chamelium:HDMI-A-1] indicate
@@ -102,13 +103,22 @@ example (only Chamelium.URL is mandatory):
     [Chamelium:DP-1]
     # The ChameliumPortID indicates physical port (device) id of a Chamelium Board.
     # A Chamelium daemon program defines these port ids as
-    # DP1 (located next to the HDMI port) = 1
-    # DP2 (located next to the VGA connector) = 2
-    # HDMI = 3 and VGA = 4
+    # - DP1 (located next to the HDMI port) = 1
+    # - DP2 (located next to the VGA connector) = 2
+    # - HDMI = 3
+    # - VGA = 4
     # The port ids are defined at:
     # https://chromium.googlesource.com/chromiumos/platform/chameleon/+/master/chameleond/utils/ids.py
     ChameliumPortID=1
 
+    [Chamelium:HDMI-A-1]
+    # Notice that the DRM side has HDMI, but Chamelium has DP on port 2.
+    # This is possible via an HDMI-DP adapter, but such scenarios often cause
+    # issues, so by default we fail if mismatching connector types are found.
+    # If AdapterAllowed is set to 1, the tests will proceed with a warning.
+    ChameliumPortID=2
+    AdapterAllowed=1
+
     [Chamelium:HDMI-A-2]
     ChameliumPortID=3
 
diff --git a/lib/igt_chamelium.c b/lib/igt_chamelium.c
index b4d838bb..55cbfa12 100644
--- a/lib/igt_chamelium.c
+++ b/lib/igt_chamelium.c
@@ -26,6 +26,7 @@
 
 #include "config.h"
 
+#include <stdbool.h>
 #include <string.h>
 #include <errno.h>
 #include <math.h>
@@ -103,6 +104,7 @@ struct chamelium_port {
 	int id;
 	int connector_id;
 	char *name;
+	bool adapter_allowed;
 };
 
 struct chamelium_frame_dump {
@@ -2324,6 +2326,9 @@ static bool chamelium_read_port_mappings(struct chamelium *chamelium,
 			goto out;
 		}
 
+		port->adapter_allowed = g_key_file_get_boolean(igt_key_file, group,
+		                                               "AdapterAllowed", &error);
+
 		for (j = 0;
 		     j < res->count_connectors && !port->connector_id;
 		     j++) {
@@ -2557,6 +2562,7 @@ static bool chamelium_autodiscover(struct chamelium *chamelium, int drm_fd)
 		port->id = port_id;
 		port->type = chamelium_get_port_type(chamelium, port);
 		port->connector_id = conn_id;
+		port->adapter_allowed = false;
 
 		connector = drmModeGetConnectorCurrent(drm_fd, conn_id);
 		snprintf(conn_name, sizeof(conn_name), "%s-%u",
@@ -2703,6 +2709,7 @@ error:
 struct chamelium *chamelium_init(int drm_fd)
 {
 	struct chamelium *chamelium = chamelium_init_rpc_only();
+	bool mismatching_ports_found = false;
 
 	if (chamelium == NULL)
 		return NULL;
@@ -2734,9 +2741,37 @@ struct chamelium *chamelium_init(int drm_fd)
 		}
 	}
 
+	for (int i = 0; i < chamelium->port_count; i++) {
+		bool type_mismatch = false;
+		struct chamelium_port * port = &chamelium->ports[i];
+		drmModeConnectorPtr connector =
+			drmModeGetConnectorCurrent(drm_fd, port->connector_id);
+
+		igt_assert(connector != NULL);
+
+		type_mismatch = port->type != connector->connector_type;
+
+		if (type_mismatch)
+			igt_info("Chamelium port %d is %s, but the DRM connector is %s\n",
+				 port->id, kmstest_connector_type_str(port->type),
+				 kmstest_connector_type_str(connector->connector_type));
+
+		if (type_mismatch && !port->adapter_allowed)
+			mismatching_ports_found = true;
+
+		drmModeFreeConnector(connector);
+	}
+
 	cleanup_instance = chamelium;
 	igt_install_exit_handler(chamelium_exit_handler);
 
+	igt_abort_on_f(mismatching_ports_found,
+		       "Chamelium port(s) with mismatching connector type on the "
+		       "DRM side found - this will most likely cause test failures. "
+		       "If you want to proceed with this this configuration, set the "
+		       "port mapping manually in .igtrc with AdapterAllowed=1. See "
+		       "docs/chamelium.txt for more information.\n");
+
 	return chamelium;
 error:
 	close(chamelium->drm_fd);
-- 
2.36.1