drivers/gpu/drm/tests/drm_modes_test.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/tests/drm_modes_test.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/tests/drm_modes_test.c
Extension
.c
Size
5640 bytes
Lines
209
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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_analog_tv_ntsc_480i(struct kunit *test)
{
	struct drm_test_modes_priv *priv = test->priv;
	struct drm_display_mode *mode;
	int ret;

	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);

	ret = drm_kunit_add_mode_destroy_action(test, mode);
	KUNIT_ASSERT_EQ(test, ret, 0);

	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;
	int ret;

	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);

	ret = drm_kunit_add_mode_destroy_action(test, expected);
	KUNIT_ASSERT_EQ(test, ret, 0);

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

	ret = drm_kunit_add_mode_destroy_action(test, mode);
	KUNIT_ASSERT_EQ(test, ret, 0);

	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;
	int ret;

	mode = drm_analog_tv_mode(priv->drm,

Annotation

Implementation Notes