Provide test to verify a mandatory fallback to YUV420 output cannot
succeed when driver doesn't advertise YUV420 support.
Acked-by: Maxime Ripard <mrip...@kernel.org>
Signed-off-by: Cristian Ciocaltea <cristian.ciocal...@collabora.com>
---
drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 87 ++++++++++++++++++++++
1 file changed, 87 insertions(+)
diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index
d98fb9803b46902016747f3fc9701eacd493d473..8bd412735000cb18e66aeca21433b2ebbefe2b44
100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -1534,6 +1534,92 @@ static void
drm_test_check_max_tmds_rate_bpc_fallback_ignore_yuv420(struct kunit
drm_modeset_acquire_fini(&ctx);
}
+/*
+ * Test that if a driver supports only RGB, but the chosen mode can be
+ * supported by the screen only in YUV420 output format, we end up with
+ * unsuccessful fallback attempts.
+ */
+static void drm_test_check_driver_unsupported_fallback_yuv420(struct kunit
*test)
+{
+ struct drm_atomic_helper_connector_hdmi_priv *priv;
+ struct drm_modeset_acquire_ctx ctx;
+ struct drm_connector_state *conn_state;
+ struct drm_crtc_state *crtc_state;
+ struct drm_atomic_state *state;
+ struct drm_display_info *info;
+ struct drm_display_mode *preferred, *yuv420_only_mode;
+ struct drm_connector *conn;
+ struct drm_device *drm;
+ struct drm_crtc *crtc;
+ int ret;
+
+ priv = drm_kunit_helper_connector_hdmi_init_with_edid_funcs(test,
+ BIT(HDMI_COLORSPACE_RGB),
+ 12,
+ &dummy_connector_hdmi_funcs,
+
test_edid_hdmi_1080p_rgb_yuv_4k_yuv420_dc_max_200mhz);
+ KUNIT_ASSERT_NOT_NULL(test, priv);
+
+ drm = &priv->drm;
+ crtc = priv->crtc;
+ conn = &priv->connector;
+ info = &conn->display_info;
+ KUNIT_ASSERT_TRUE(test, info->is_hdmi);
+ KUNIT_ASSERT_FALSE(test, conn->ycbcr_420_allowed);
+
+ preferred = find_preferred_mode(conn);
+ KUNIT_ASSERT_NOT_NULL(test, preferred);
+ KUNIT_ASSERT_FALSE(test, drm_mode_is_420_also(info, preferred));
+
+ yuv420_only_mode = drm_kunit_display_mode_from_cea_vic(test, drm, 95);
+ KUNIT_ASSERT_NOT_NULL(test, yuv420_only_mode);
+ KUNIT_ASSERT_TRUE(test, drm_mode_is_420_only(info, yuv420_only_mode));
+
+ drm_modeset_acquire_init(&ctx, 0);
+
+retry_conn_enable:
+ ret = drm_kunit_helper_enable_crtc_connector(test, drm, crtc, conn,
+ preferred, &ctx);
+ if (ret == -EDEADLK) {
+ ret = drm_modeset_backoff(&ctx);
+ if (!ret)
+ goto retry_conn_enable;
+ }
+ KUNIT_EXPECT_EQ(test, ret, 0);
+
+ conn_state = conn->state;
+ KUNIT_ASSERT_NOT_NULL(test, conn_state);
+ KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format,
HDMI_COLORSPACE_RGB);
+
+ state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
+
+retry_crtc_state:
+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
+ if (PTR_ERR(crtc_state) == -EDEADLK) {
+ drm_atomic_state_clear(state);
+ ret = drm_modeset_backoff(&ctx);
+ if (!ret)
+ goto retry_crtc_state;
+ }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state);
+
+ ret = drm_atomic_set_mode_for_crtc(crtc_state, yuv420_only_mode);
+ KUNIT_EXPECT_EQ(test, ret, 0);
+
+ ret = drm_atomic_check_only(state);
+ if (ret == -EDEADLK) {
+ drm_atomic_state_clear(state);
+ ret = drm_modeset_backoff(&ctx);
+ if (!ret)
+ goto retry_crtc_state;
+ }
+ KUNIT_ASSERT_LT(test, ret, 0);
+
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+}
+
/*
* Test that if a driver and screen supports RGB and YUV formats, and we
* try to set the VIC 1 mode, we end up with 8bpc RGB even if we could
@@ -1930,6 +2016,7 @@ static struct kunit_case
drm_atomic_helper_connector_hdmi_check_tests[] = {
KUNIT_CASE(drm_test_check_max_tmds_rate_bpc_fallback_yuv420),
KUNIT_CASE(drm_test_check_max_tmds_rate_bpc_fallback_ignore_yuv422),
KUNIT_CASE(drm_test_check_max_tmds_rate_bpc_fallback_ignore_yuv420),
+ KUNIT_CASE(drm_test_check_driver_unsupported_fallback_yuv420),
KUNIT_CASE(drm_test_check_output_bpc_crtc_mode_changed),
KUNIT_CASE(drm_test_check_output_bpc_crtc_mode_not_changed),
KUNIT_CASE(drm_test_check_output_bpc_dvi),
--
2.49.0
