Introduce a test to cover the creation of a framebuffer with
a setted modifier and a driver that don't support modifiers.

Signed-off-by: Carlos Eduardo Gallo Filho <gcar...@disroot.org>
---
 drivers/gpu/drm/tests/drm_framebuffer_test.c | 21 ++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_framebuffer_test.c 
b/drivers/gpu/drm/tests/drm_framebuffer_test.c
index 1fbb534b2e22..7ee595321462 100644
--- a/drivers/gpu/drm/tests/drm_framebuffer_test.c
+++ b/drivers/gpu/drm/tests/drm_framebuffer_test.c
@@ -388,6 +388,26 @@ static void drm_framebuffer_test_to_desc(const struct 
drm_framebuffer_test *t, c
 KUNIT_ARRAY_PARAM(drm_framebuffer_create, drm_framebuffer_create_cases,
                  drm_framebuffer_test_to_desc);
 
+static void drm_test_framebuffer_modifiers_not_supported(struct kunit *test)
+{
+       struct drm_mode_fb_cmd2 cmd = {
+               .width = MAX_WIDTH, .height = MAX_HEIGHT,
+               .pixel_format = DRM_FORMAT_ABGR8888, .handles = { 1, 0, 0 },
+               .offsets = { UINT_MAX / 2, 0, 0 }, .pitches = { 4 * MAX_WIDTH, 
0, 0 },
+               .flags = DRM_MODE_FB_MODIFIERS,
+       };
+       struct drm_device *mock = test->priv;
+       int buffer_created = 0;
+
+       mock->dev_private = &buffer_created;
+       mock->mode_config.fb_modifiers_not_supported = 1;
+
+       drm_internal_framebuffer_create(mock, &cmd, NULL);
+       KUNIT_EXPECT_EQ(test, 0, buffer_created);
+
+       mock->mode_config.fb_modifiers_not_supported = 0;
+}
+
 struct check_src_coords_case {
        const int expect;
        const uint32_t src_x;
@@ -494,6 +514,7 @@ KUNIT_ARRAY_PARAM(check_src_coords, check_src_coords_cases,
                  check_src_coords_test_to_desc);
 
 static struct kunit_case drm_framebuffer_tests[] = {
+       KUNIT_CASE(drm_test_framebuffer_modifiers_not_supported),
        KUNIT_CASE_PARAM(drm_test_framebuffer_create, 
drm_framebuffer_create_gen_params),
        KUNIT_CASE_PARAM(drm_test_framebuffer_check_src_coords, 
check_src_coords_gen_params),
        { }
-- 
2.41.0

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