drm_modes_test.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Kunit test for drm_modes functions
 */

#include <drm/drm_drv.h>
#include <drm/drm_kunit_helpers.h>
#include <drm/drm_modes.h>

#include <kunit/test.h>

#include <linux/units.h>

struct drm_test_modes_priv {
	struct drm_device *drm;
	struct device *dev;
};

static int drm_test_modes_init(struct kunit *test)
{
	struct drm_test_modes_priv *priv;

	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, priv);

	priv->dev = drm_kunit_helper_alloc_device(test);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);

	priv->drm = __drm_kunit_helper_alloc_drm_device(test, priv->dev,
							sizeof(*priv->drm), 0,
							DRIVER_MODESET);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);

	test->priv = priv;

	return 0;
}

static void drm_test_modes_exit(struct kunit *test)
{
	struct drm_test_modes_priv *priv = test->priv;

	drm_kunit_helper_free_device(test, priv->dev);
}

static void drm_test_modes_analog_tv_ntsc_480i(struct kunit *test)
{
	struct drm_test_modes_priv *priv = test->priv;
	struct drm_display_mode *mode;

	mode = drm_analog_tv_mode(priv->drm,
				  DRM_MODE_TV_MODE_NTSC,
				  13500 * HZ_PER_KHZ, 720, 480,
				  true);
	KUNIT_ASSERT_NOT_NULL(test, mode);

	KUNIT_EXPECT_EQ(test, drm_mode_vrefresh(mode), 60);
	KUNIT_EXPECT_EQ(test, mode->hdisplay, 720);

	/* BT.601 defines hsync_start at 736 for 480i */
	KUNIT_EXPECT_EQ(test, mode->hsync_start, 736);

	/*
	 * The NTSC standard expects a line to take 63.556us. With a
	 * pixel clock of 13.5 MHz, a pixel takes around 74ns, so we
	 * need to have 63556ns / 74ns = 858.
	 *
	 * This is also mandated by BT.601.
	 */
	KUNIT_EXPECT_EQ(test, mode->htotal, 858);

	KUNIT_EXPECT_EQ(test, mode->vdisplay, 480);
	KUNIT_EXPECT_EQ(test, mode->vtotal, 525);
}

static void drm_test_modes_analog_tv_ntsc_480i_inlined(struct kunit *test)
{
	struct drm_test_modes_priv *priv = test->priv;
	struct drm_display_mode *expected, *mode;

	expected = drm_analog_tv_mode(priv->drm,
				      DRM_MODE_TV_MODE_NTSC,
				      13500 * HZ_PER_KHZ, 720, 480,
				      true);
	KUNIT_ASSERT_NOT_NULL(test, expected);

	mode = drm_mode_analog_ntsc_480i(priv->drm);
	KUNIT_ASSERT_NOT_NULL(test, mode);

	KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected, mode));
}

static void drm_test_modes_analog_tv_pal_576i(struct kunit *test)
{
	struct drm_test_modes_priv *priv = test->priv;
	struct drm_display_mode *mode;

	mode = drm_analog_tv_mode(priv->drm,
				  DRM_MODE_TV_MODE_PAL,
				  13500 * HZ_PER_KHZ, 720, 576,
				  true);
	KUNIT_ASSERT_NOT_NULL(test, mode);

	KUNIT_EXPECT_EQ(test, drm_mode_vrefresh(mode), 50);
	KUNIT_EXPECT_EQ(test, mode->hdisplay, 720);

	/* BT.601 defines hsync_start at 732 for 576i */
	KUNIT_EXPECT_EQ(test, mode->hsync_start, 732);

	/*
	 * The PAL standard expects a line to take 64us. With a pixel
	 * clock of 13.5 MHz, a pixel takes around 74ns, so we need to
	 * have 64000ns / 74ns = 864.
	 *
	 * This is also mandated by BT.601.
	 */
	KUNIT_EXPECT_EQ(test, mode->htotal, 864);

	KUNIT_EXPECT_EQ(test, mode->vdisplay, 576);
	KUNIT_EXPECT_EQ(test, mode->vtotal, 625);
}

static void drm_test_modes_analog_tv_pal_576i_inlined(struct kunit *test)
{
	struct drm_test_modes_priv *priv = test->priv;
	struct drm_display_mode *expected, *mode;

	expected = drm_analog_tv_mode(priv->drm,
				      DRM_MODE_TV_MODE_PAL,
				      13500 * HZ_PER_KHZ, 720, 576,
				      true);
	KUNIT_ASSERT_NOT_NULL(test, expected);

	mode = drm_mode_analog_pal_576i(priv->drm);
	KUNIT_ASSERT_NOT_NULL(test, mode);

	KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected, mode));
}

static struct kunit_case drm_modes_analog_tv_tests[] = {
	KUNIT_CASE(drm_test_modes_analog_tv_ntsc_480i),
	KUNIT_CASE(drm_test_modes_analog_tv_ntsc_480i_inlined),
	KUNIT_CASE(drm_test_modes_analog_tv_pal_576i),
	KUNIT_CASE(drm_test_modes_analog_tv_pal_576i_inlined),
	{ }
};

static struct kunit_suite drm_modes_analog_tv_test_suite = {
	.name = "drm_modes_analog_tv",
	.init = drm_test_modes_init,
	.exit = drm_test_modes_exit,
	.test_cases = drm_modes_analog_tv_tests,
};

kunit_test_suite(drm_modes_analog_tv_test_suite);

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