linux-kernel - [PATCH v4 23/23] drm/tests: hdmi: Add test for unsupported RGB/YUV420 mode

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Message-Id: <20250425-hdmi-conn-yuv-v4-23-5e55e2aaa3fa@collabora.com>
Date: Fri, 25 Apr 2025 13:27:14 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH v4 23/23] drm/tests: hdmi: Add test for unsupported
 RGB/YUV420 mode

Provide a test to verify that if both driver and screen support RGB and
YUV420 formats, drm_atomic_helper_connector_hdmi_check() cannot succeed
when trying to set a mode unsupported by the display.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 66 ++++++++++++++++++++++
 1 file changed, 66 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 d79084cfb516b69c4244098c0767d604ad02f2c3..6337a1c52b86810c638f446c4995e7ee63dbc084 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -1622,6 +1622,71 @@ static void drm_test_check_driver_unsupported_fallback_yuv420(struct kunit *test
 	drm_modeset_acquire_fini(&ctx);
 }
 
+/*
+ * Test that if a driver and screen supports RGB and YUV420 formats, but the
+ * chosen mode cannot be supported by the screen, we end up with unsuccessful
+ * fallback attempts.
+ */
+static void drm_test_check_display_unsupported_fallback_rgb_yuv420(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_modeset_acquire_ctx ctx;
+	struct drm_crtc_state *crtc_state;
+	struct drm_atomic_state *state;
+	struct drm_display_info *info;
+	struct drm_display_mode *preferred, *unsupported_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) |
+				BIT(HDMI_COLORSPACE_YUV420),
+				10,
+				&dummy_connector_hdmi_funcs,
+				test_edid_hdmi_4k_rgb_yuv420_dc_max_340mhz);
+	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_TRUE(test, conn->ycbcr_420_allowed);
+
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NOT_NULL(test, preferred);
+
+	unsupported_mode = drm_kunit_display_mode_from_cea_vic(test, drm, 96);
+	KUNIT_ASSERT_NOT_NULL(test, unsupported_mode);
+
+	drm_modeset_acquire_init(&ctx, 0);
+
+	ret = drm_kunit_helper_try_enable_crtc_connector(test, drm,
+							 crtc, conn,
+							 preferred, &ctx);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
+
+retry:
+	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	drm_kunit_atomic_restart_on_deadlock(ret, state, &ctx, retry);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state);
+
+	ret = drm_atomic_set_mode_for_crtc(crtc_state, unsupported_mode);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	ret = drm_atomic_check_only(state);
+	drm_kunit_atomic_restart_on_deadlock(ret, state, &ctx, retry);
+	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
@@ -2023,6 +2088,7 @@ static struct kunit_case drm_atomic_helper_connector_hdmi_check_tests[] = {
 	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_display_unsupported_fallback_rgb_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