1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Kunit test for drm_modes functions
4 */
5
6 #include <drm/drm_drv.h>
7 #include <drm/drm_kunit_helpers.h>
8 #include <drm/drm_modes.h>
9
10 #include <kunit/test.h>
11
12 #include <linux/units.h>
13
14 struct drm_test_modes_priv {
15 struct drm_device *drm;
16 struct device *dev;
17 };
18
drm_test_modes_init(struct kunit * test)19 static int drm_test_modes_init(struct kunit *test)
20 {
21 struct drm_test_modes_priv *priv;
22
23 priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
24 KUNIT_ASSERT_NOT_NULL(test, priv);
25
26 priv->dev = drm_kunit_helper_alloc_device(test);
27 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
28
29 priv->drm = __drm_kunit_helper_alloc_drm_device(test, priv->dev,
30 sizeof(*priv->drm), 0,
31 DRIVER_MODESET);
32 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);
33
34 test->priv = priv;
35
36 return 0;
37 }
38
drm_test_modes_exit(struct kunit * test)39 static void drm_test_modes_exit(struct kunit *test)
40 {
41 struct drm_test_modes_priv *priv = test->priv;
42
43 drm_kunit_helper_free_device(test, priv->dev);
44 }
45
drm_test_modes_analog_tv_ntsc_480i(struct kunit * test)46 static void drm_test_modes_analog_tv_ntsc_480i(struct kunit *test)
47 {
48 struct drm_test_modes_priv *priv = test->priv;
49 struct drm_display_mode *mode;
50
51 mode = drm_analog_tv_mode(priv->drm,
52 DRM_MODE_TV_MODE_NTSC,
53 13500 * HZ_PER_KHZ, 720, 480,
54 true);
55 KUNIT_ASSERT_NOT_NULL(test, mode);
56
57 KUNIT_EXPECT_EQ(test, drm_mode_vrefresh(mode), 60);
58 KUNIT_EXPECT_EQ(test, mode->hdisplay, 720);
59
60 /* BT.601 defines hsync_start at 736 for 480i */
61 KUNIT_EXPECT_EQ(test, mode->hsync_start, 736);
62
63 /*
64 * The NTSC standard expects a line to take 63.556us. With a
65 * pixel clock of 13.5 MHz, a pixel takes around 74ns, so we
66 * need to have 63556ns / 74ns = 858.
67 *
68 * This is also mandated by BT.601.
69 */
70 KUNIT_EXPECT_EQ(test, mode->htotal, 858);
71
72 KUNIT_EXPECT_EQ(test, mode->vdisplay, 480);
73 KUNIT_EXPECT_EQ(test, mode->vtotal, 525);
74 }
75
drm_test_modes_analog_tv_ntsc_480i_inlined(struct kunit * test)76 static void drm_test_modes_analog_tv_ntsc_480i_inlined(struct kunit *test)
77 {
78 struct drm_test_modes_priv *priv = test->priv;
79 struct drm_display_mode *expected, *mode;
80
81 expected = drm_analog_tv_mode(priv->drm,
82 DRM_MODE_TV_MODE_NTSC,
83 13500 * HZ_PER_KHZ, 720, 480,
84 true);
85 KUNIT_ASSERT_NOT_NULL(test, expected);
86
87 mode = drm_mode_analog_ntsc_480i(priv->drm);
88 KUNIT_ASSERT_NOT_NULL(test, mode);
89
90 KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected, mode));
91 }
92
drm_test_modes_analog_tv_pal_576i(struct kunit * test)93 static void drm_test_modes_analog_tv_pal_576i(struct kunit *test)
94 {
95 struct drm_test_modes_priv *priv = test->priv;
96 struct drm_display_mode *mode;
97
98 mode = drm_analog_tv_mode(priv->drm,
99 DRM_MODE_TV_MODE_PAL,
100 13500 * HZ_PER_KHZ, 720, 576,
101 true);
102 KUNIT_ASSERT_NOT_NULL(test, mode);
103
104 KUNIT_EXPECT_EQ(test, drm_mode_vrefresh(mode), 50);
105 KUNIT_EXPECT_EQ(test, mode->hdisplay, 720);
106
107 /* BT.601 defines hsync_start at 732 for 576i */
108 KUNIT_EXPECT_EQ(test, mode->hsync_start, 732);
109
110 /*
111 * The PAL standard expects a line to take 64us. With a pixel
112 * clock of 13.5 MHz, a pixel takes around 74ns, so we need to
113 * have 64000ns / 74ns = 864.
114 *
115 * This is also mandated by BT.601.
116 */
117 KUNIT_EXPECT_EQ(test, mode->htotal, 864);
118
119 KUNIT_EXPECT_EQ(test, mode->vdisplay, 576);
120 KUNIT_EXPECT_EQ(test, mode->vtotal, 625);
121 }
122
drm_test_modes_analog_tv_pal_576i_inlined(struct kunit * test)123 static void drm_test_modes_analog_tv_pal_576i_inlined(struct kunit *test)
124 {
125 struct drm_test_modes_priv *priv = test->priv;
126 struct drm_display_mode *expected, *mode;
127
128 expected = drm_analog_tv_mode(priv->drm,
129 DRM_MODE_TV_MODE_PAL,
130 13500 * HZ_PER_KHZ, 720, 576,
131 true);
132 KUNIT_ASSERT_NOT_NULL(test, expected);
133
134 mode = drm_mode_analog_pal_576i(priv->drm);
135 KUNIT_ASSERT_NOT_NULL(test, mode);
136
137 KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected, mode));
138 }
139
140 static struct kunit_case drm_modes_analog_tv_tests[] = {
141 KUNIT_CASE(drm_test_modes_analog_tv_ntsc_480i),
142 KUNIT_CASE(drm_test_modes_analog_tv_ntsc_480i_inlined),
143 KUNIT_CASE(drm_test_modes_analog_tv_pal_576i),
144 KUNIT_CASE(drm_test_modes_analog_tv_pal_576i_inlined),
145 { }
146 };
147
148 static struct kunit_suite drm_modes_analog_tv_test_suite = {
149 .name = "drm_modes_analog_tv",
150 .init = drm_test_modes_init,
151 .exit = drm_test_modes_exit,
152 .test_cases = drm_modes_analog_tv_tests,
153 };
154
155 kunit_test_suite(drm_modes_analog_tv_test_suite);
156
157 MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
158 MODULE_LICENSE("GPL");
159