tests/kms_dp_aux_dev: Add drm_dp_aux test

Add a basic test for /dev/drm_dp_aux. We just try to read 16 bytes
from each connector's aux device, and if succesful we do a few
quick sanity checks on the data.

v2: Use igt_assert_f() to give a bit more info (Chris)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/tests/kms_dp_aux_dev.c b/tests/kms_dp_aux_dev.c
new file mode 100644
index 00000000..4f52434a
--- /dev/null
+++ b/tests/kms_dp_aux_dev.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright © 2019 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+
+#include "igt.h"
+#include "igt_kms.h"
+
+IGT_TEST_DESCRIPTION("Test that /dev/drm_dp_aux reads work");
+
+static bool test(int drm_fd, uint32_t connector_id)
+{
+	drmModeConnector *connector;
+	DIR *dir;
+	int dir_fd;
+
+	connector = drmModeGetConnectorCurrent(drm_fd, connector_id);
+	dir_fd = igt_connector_sysfs_open(drm_fd, connector);
+	drmModeFreeConnector(connector);
+	igt_assert(dir_fd >= 0);
+
+	dir = fdopendir(dir_fd);
+	igt_assert(dir);
+
+	for (;;) {
+		struct dirent *ent;
+		char path[5 + sizeof(ent->d_name)];
+		uint8_t buf[16];
+		int fd, ret;
+
+		ent = readdir(dir);
+		if (!ent)
+			break;
+
+		if (strncmp(ent->d_name, "drm_dp_aux", 10))
+			continue;
+
+		snprintf(path, sizeof(path), "/dev/%s", ent->d_name);
+
+		fd = open(path, O_RDONLY);
+		igt_assert(fd >= 0);
+
+		ret = read(fd, buf, sizeof(buf));
+		igt_assert(ret == sizeof(buf) || errno == ETIMEDOUT);
+
+		igt_info("%s: %s\n", path,
+			 ret > 0 ? "success" : "timed out");
+
+		close(fd);
+
+		closedir(dir);
+		close(dir_fd);
+
+		if (ret > 0) {
+			/* DPCD rev sanity check */
+			igt_assert_f(buf[0] == 0x10 ||
+				     buf[0] == 0x11 ||
+				     buf[0] == 0x12 ||
+				     buf[0] == 0x13 ||
+				     buf[0] == 0x14,
+				     "Read bogus DPCD rev 0x%02x\n",
+				     buf[0]);
+			/* DPCD max lane count sanity check */
+			igt_assert_f((buf[2] & 0x1f) == 0x01 ||
+				     (buf[2] & 0x1f) == 0x02 ||
+				     (buf[2] & 0x1f) == 0x04,
+				     "Read bogus DPCD max lane count 0x%02x\n",
+				     buf[2] & 0x1f);
+		}
+
+		return ret > 0;
+	}
+
+	closedir(dir);
+	close(dir_fd);
+	return false;
+}
+
+igt_simple_main
+{
+	int valid_connectors = 0;
+	drmModeRes *res;
+	int drm_fd;
+
+	drm_fd = drm_open_driver_master(DRIVER_ANY);
+
+	res = drmModeGetResources(drm_fd);
+	igt_require(res);
+
+	for (int i = 0; i < res->count_connectors; i++)
+		valid_connectors += test(drm_fd, res->connectors[i]);
+	igt_require(valid_connectors);
+
+	drmModeFreeResources(res);
+}