drm_connector_pick_cmdline_mode() is in charge of finding a proper
drm_display_mode from the definition we got in the video= command line
argument.
Let's add some unit tests to make sure we're not getting any regressions
there.
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index bbc535cc50dd..ee6b8f193c24 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -1237,3 +1237,7 @@ int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
return ret;
}
EXPORT_SYMBOL(drm_client_modeset_dpms);
+
+#ifdef CONFIG_DRM_KUNIT_TEST
+#include "tests/drm_mode_test.c"
+#endif
diff --git a/drivers/gpu/drm/tests/drm_mode_test.c b/drivers/gpu/drm/tests/drm_mode_test.c
new file mode 100644
index 000000000000..0f71519788a7
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_mode_test.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022 Maxime Ripard <mripard@xxxxxxxxxx>
+ */
+
+#include <drm/drm_mode.h>
+#include <kunit/test.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_probe_helper.h>
+
+struct drm_mode_test_priv {
+ struct device *dev;
+ struct drm_device *drm;
+ struct drm_connector connector;
+};
+
+static const struct drm_mode_config_funcs drm_mode_config_funcs = {
+};
+
+static const struct drm_driver drm_mode_driver = {
+};
+
+static int drm_mode_connector_get_modes(struct drm_connector *connector)
+{
+ struct drm_display_mode *mode;
+ int ret;
+
+ ret = drm_add_modes_noedid(connector, 1920, 1200);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct drm_connector_helper_funcs drm_mode_connector_helper_funcs = {
+ .get_modes = drm_mode_connector_get_modes,
+};
+
+static const struct drm_connector_funcs drm_mode_connector_funcs = {
+};
+
+static int drm_mode_test_init(struct kunit *test)
+{
+ struct drm_mode_test_priv *priv;
+ int ret;
+
+ priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ test->priv = priv;
+
+ priv->dev = root_device_register("drm-mode-test");
+ if (IS_ERR(priv->dev))
+ return PTR_ERR(priv->dev);
+
+ priv->drm = drm_dev_alloc(&drm_mode_driver, priv->dev);
+ if (IS_ERR(priv->drm))
+ return PTR_ERR(priv->drm);
+ priv->drm->mode_config.funcs = &drm_mode_config_funcs;
+
+ ret = drmm_mode_config_init(priv->drm);
+ if (ret)
+ return ret;
+
+ ret = drmm_connector_init(priv->drm, &priv->connector,
+ &drm_mode_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown,
+ NULL);
+ if (ret)
+ return ret;
+ drm_connector_helper_add(&priv->connector, &drm_mode_connector_helper_funcs);
+
+ return 0;
+}
+
+static void drm_mode_test_exit(struct kunit *test)
+{
+ struct drm_mode_test_priv *priv = test->priv;
+
+ drm_dev_put(priv->drm);
+ root_device_unregister(priv->dev);
+}
+
+static void drm_mode_res_1920_1080_60(struct kunit *test)
+{
+ struct drm_mode_test_priv *priv = test->priv;
+ struct drm_device *drm = priv->drm;
+ struct drm_connector *connector = &priv->connector;
+ struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
+ struct drm_display_mode *expected_mode, *mode;
+ const char *cmdline = "1920x1080@60";
+ int ret;
+
+ expected_mode = drm_mode_find_dmt(priv->drm, 1920, 1080, 60, false);
+ KUNIT_ASSERT_PTR_NE(test, expected_mode, NULL);
+
+ KUNIT_ASSERT_TRUE(test,
+ drm_mode_parse_command_line_for_connector(cmdline,
+ connector,
+ cmdline_mode));
+
+ mutex_lock(&drm->mode_config.mutex);
+ ret = drm_helper_probe_single_connector_modes(connector, 1920, 1080);
+ mutex_unlock(&drm->mode_config.mutex);
+ KUNIT_ASSERT_GT(test, ret, 0);
+
+ mode = drm_connector_pick_cmdline_mode(connector);
+ KUNIT_ASSERT_PTR_NE(test, mode, NULL);
+
+ KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected_mode, mode));
+}
+
+static struct kunit_case drm_mode_tests[] = {
+ KUNIT_CASE(drm_mode_res_1920_1080_60),
+ {}
+};
+
+static struct kunit_suite drm_mode_test_suite = {
+ .name = "drm_mode",
+ .init = drm_mode_test_init,
+ .exit = drm_mode_test_exit,
+ .test_cases = drm_mode_tests
+};
+
+kunit_test_suite(drm_mode_test_suite);
+MODULE_AUTHOR("Maxime Ripard <mripard@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
b4 0.10.0-dev-49460
