[PATCH v4 06/45] drm/tests: connector: Add tests for drmm_connector_init

Maxime Ripard
2023-11-28T10:25:12Z

drmm_connector_init is the preferred function to initialize a
drm_connector structure. Let's add a bunch of unit tests for it.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
drivers/gpu/drm/tests/drm_connector_test.c | 219 ++++++++++++++++++++++++++++-
1 file changed, 218 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tests/drm_connector_test.c b/drivers/gpu/drm/tests/drm_connector_test.c
index c66aa2dc8d9d..4951b5b121a2 100644
--- a/drivers/gpu/drm/tests/drm_connector_test.c
+++ b/drivers/gpu/drm/tests/drm_connector_test.c
@@ -3,10 +3,224 @@
* Kunit test for drm_modes functions
*/

+#include <linux/i2c.h>
+
+#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_kunit_helpers.h>

#include <kunit/test.h>

+struct drm_connector_init_priv {
+ struct drm_device drm;
+ struct drm_connector connector;
+ struct i2c_adapter ddc;
+};
+
+static const struct drm_connector_funcs dummy_funcs = {
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .reset = drm_atomic_helper_connector_reset,
+};
+
+static int dummy_ddc_xfer(struct i2c_adapter *adapter,
+ struct i2c_msg *msgs, int num)
+{
+ return num;
+}
+
+static u32 dummy_ddc_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm dummy_ddc_algorithm = {
+ .master_xfer = dummy_ddc_xfer,
+ .functionality = dummy_ddc_func,
+};
+
+static void i2c_del_adapter_wrapper(void *ptr)
+{
+ struct i2c_adapter *adap = ptr;
+
+ i2c_del_adapter(adap);
+}
+
+static int drm_test_connector_init(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv;
+ struct device *dev;
+ int ret;
+
+ dev = drm_kunit_helper_alloc_device(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+
+ priv = drm_kunit_helper_alloc_drm_device(test, dev,
+ struct drm_connector_init_priv, drm,
+ DRIVER_MODESET | DRIVER_ATOMIC);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+
+ strscpy(priv->ddc.name, "dummy-connector-ddc", sizeof(priv->ddc.name));
+ priv->ddc.owner = THIS_MODULE;
+ priv->ddc.algo = &dummy_ddc_algorithm;
+ priv->ddc.dev.parent = dev;
+
+ ret = i2c_add_adapter(&priv->ddc);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ ret = kunit_add_action_or_reset(test, i2c_del_adapter_wrapper, &priv->ddc);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ test->priv = priv;
+ return 0;
+}
+
+/*
+ * Test that the registration of a bog standard connector works as
+ * expected and doesn't report any error.
+ */
+static void drm_test_drmm_connector_init(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv = test->priv;
+ int ret;
+
+ ret = drmm_connector_init(&priv->drm, &priv->connector,
+ &dummy_funcs,
+ DRM_MODE_CONNECTOR_HDMIA,
+ &priv->ddc);
+ KUNIT_EXPECT_EQ(test, ret, 0);
+}
+
+/*
+ * Test that the registration of a connector without a DDC adapter
+ * doesn't report any error.
+ */
+static void drm_test_drmm_connector_init_null_ddc(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv = test->priv;
+ int ret;
+
+ ret = drmm_connector_init(&priv->drm, &priv->connector,
+ &dummy_funcs,
+ DRM_MODE_CONNECTOR_HDMIA,
+ NULL);
+ KUNIT_EXPECT_EQ(test, ret, 0);
+}
+
+/*
+ * Test that the registration of a connector without a DRM device fails.
+ */
+static void drm_test_drmm_connector_init_null_device(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv = test->priv;
+ int ret;
+
+ ret = drmm_connector_init(NULL, &priv->connector,
+ &dummy_funcs,
+ DRM_MODE_CONNECTOR_HDMIA,
+ &priv->ddc);
+ KUNIT_EXPECT_LT(test, ret, 0);
+}
+
+/*
+ * Test that the registration of a NULL connector fails.
+ */
+static void drm_test_drmm_connector_init_null_connector(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv = test->priv;
+ int ret;
+
+ ret = drmm_connector_init(&priv->drm, NULL,
+ &dummy_funcs,
+ DRM_MODE_CONNECTOR_HDMIA,
+ &priv->ddc);
+ KUNIT_EXPECT_LT(test, ret, 0);
+}
+
+/*
+ * Test that the registration of a connector without any callbacks
+ * fails.
+ */
+static void drm_test_drmm_connector_init_null_funcs(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv = test->priv;
+ int ret;
+
+ ret = drmm_connector_init(&priv->drm, &priv->connector,
+ NULL,
+ DRM_MODE_CONNECTOR_HDMIA,
+ &priv->ddc);
+ KUNIT_EXPECT_LT(test, ret, 0);
+}
+
+/*
+ * Test that the registration of a connector succeeds for all possible
+ * connector types.
+ */
+static void drm_test_drmm_connector_init_type_valid(struct kunit *test)
+{
+ struct drm_connector_init_priv *priv = test->priv;
+ unsigned int connector_type = *(unsigned int *)test->param_value;
+ int ret;
+
+ ret = drmm_connector_init(&priv->drm, &priv->connector,
+ &dummy_funcs,
+ connector_type,
+ &priv->ddc);
+ KUNIT_EXPECT_EQ(test, ret, 0);
+}
+
+static const unsigned int drm_connector_init_type_valid_tests[] = {
+ DRM_MODE_CONNECTOR_Unknown,
+ DRM_MODE_CONNECTOR_VGA,
+ DRM_MODE_CONNECTOR_DVII,
+ DRM_MODE_CONNECTOR_DVID,
+ DRM_MODE_CONNECTOR_DVIA,
+ DRM_MODE_CONNECTOR_Composite,
+ DRM_MODE_CONNECTOR_SVIDEO,
+ DRM_MODE_CONNECTOR_LVDS,
+ DRM_MODE_CONNECTOR_Component,
+ DRM_MODE_CONNECTOR_9PinDIN,
+ DRM_MODE_CONNECTOR_DisplayPort,
+ DRM_MODE_CONNECTOR_HDMIA,
+ DRM_MODE_CONNECTOR_HDMIB,
+ DRM_MODE_CONNECTOR_TV,
+ DRM_MODE_CONNECTOR_eDP,
+ DRM_MODE_CONNECTOR_VIRTUAL,
+ DRM_MODE_CONNECTOR_DSI,
+ DRM_MODE_CONNECTOR_DPI,
+ DRM_MODE_CONNECTOR_WRITEBACK,
+ DRM_MODE_CONNECTOR_SPI,
+ DRM_MODE_CONNECTOR_USB,
+};
+
+static void drm_connector_init_type_desc(const unsigned int *type, char *desc)
+{
+ sprintf(desc, "%s", drm_get_connector_type_name(*type));
+}
+
+KUNIT_ARRAY_PARAM(drm_connector_init_type_valid,
+ drm_connector_init_type_valid_tests,
+ drm_connector_init_type_desc);
+
+static struct kunit_case drmm_connector_init_tests[] = {
+ KUNIT_CASE(drm_test_drmm_connector_init),
+ KUNIT_CASE(drm_test_drmm_connector_init_null_connector),
+ KUNIT_CASE(drm_test_drmm_connector_init_null_ddc),
+ KUNIT_CASE(drm_test_drmm_connector_init_null_device),
+ KUNIT_CASE(drm_test_drmm_connector_init_null_funcs),
+ KUNIT_CASE_PARAM(drm_test_drmm_connector_init_type_valid,
+ drm_connector_init_type_valid_gen_params),
+ { }
+};
+
+static struct kunit_suite drmm_connector_init_test_suite = {
+ .name = "drmm_connector_init",
+ .init = drm_test_connector_init,
+ .test_cases = drmm_connector_init_tests,
+};
+
struct drm_get_tv_mode_from_name_test {
const char *name;
enum drm_connector_tv_mode expected_mode;
@@ -70,7 +284,10 @@ static struct kunit_suite drm_get_tv_mode_from_name_test_suite = {
.test_cases = drm_get_tv_mode_from_name_tests,
};

-kunit_test_suite(drm_get_tv_mode_from_name_test_suite);
+kunit_test_suites(
+ &drmm_connector_init_test_suite,
+ &drm_get_tv_mode_from_name_test_suite
+);

MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
MODULE_LICENSE("GPL");

--
2.41.0