path: root/drivers/gpu/drm/tests/drm_connector_test.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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_edid.h>
#include <drm/drm_kunit_helpers.h>
#include <drm/drm_modes.h>

#include <drm/display/drm_hdmi_helper.h>

#include <kunit/test.h>

#include "../drm_crtc_internal.h"

struct drm_connector_init_priv {
	struct drm_device drm;
	struct drm_connector connector;
	struct i2c_adapter ddc;
};

static const struct drm_connector_hdmi_funcs dummy_hdmi_funcs = {
};

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