linux-kernel - [PATCH v7 18/36] drm/tests: Add HDMI connector rate filter hook tests

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Message-Id: <20240222-kms-hdmi-connector-state-v7-18-8f4af575fce2@kernel.org>
Date: Thu, 22 Feb 2024 19:14:04 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Daniel Vetter <daniel@...ll.ch>, Jonathan Corbet <corbet@....net>, 
 Sandy Huang <hjc@...k-chips.com>, 
 Heiko Stübner <heiko@...ech.de>, 
 Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>
Cc: Hans Verkuil <hverkuil@...all.nl>, 
 Sebastian Wick <sebastian.wick@...hat.com>, 
 Ville Syrjälä <ville.syrjala@...ux.intel.com>, 
 dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org, 
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
 linux-sunxi@...ts.linux.dev, Maxime Ripard <mripard@...nel.org>, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: [PATCH v7 18/36] drm/tests: Add HDMI connector rate filter hook
 tests

The previous patch adds a new hook for HDMI connectors to filter out
configurations based on the TMDS character rate. Let's add some tests to
make sure it works as expected.

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 .../gpu/drm/tests/drm_atomic_state_helper_test.c   | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c b/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c
index 989661ad3aee..5a8750153510 100644
--- a/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c
@@ -113,6 +113,18 @@ static int set_connector_edid(struct kunit *test, struct drm_connector *connecto
 static const struct drm_connector_hdmi_funcs dummy_connector_hdmi_funcs = {
 };
 
+static enum drm_mode_status
+reject_connector_tmds_char_rate_valid(const struct drm_connector *connector,
+				       const struct drm_display_mode *mode,
+				       unsigned long long tmds_rate)
+{
+	return MODE_BAD;
+}
+
+static const struct drm_connector_hdmi_funcs reject_connector_hdmi_funcs = {
+	.tmds_char_rate_valid	= reject_connector_tmds_char_rate_valid,
+};
+
 static int dummy_connector_get_modes(struct drm_connector *connector)
 {
 	struct drm_atomic_helper_connector_hdmi_priv *priv =
@@ -491,7 +503,60 @@ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, conn_state->hdmi.tmds_char_rate, preferred->clock * 1500);
 }
 
+/*
+ * Test that if we filter a rate through our hook, it's indeed rejected
+ * by the whole atomic_check logic.
+ *
+ * We do so by first doing a commit on the pipeline to make sure that it
+ * works, change the HDMI helpers pointer, and then try the same commit
+ * again to see if it fails as it should.
+ */
+static void drm_test_check_hdmi_funcs_reject_rate(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_modeset_acquire_ctx *ctx;
+	struct drm_atomic_state *state;
+	struct drm_display_mode *preferred;
+	struct drm_crtc_state *crtc_state;
+	struct drm_connector *conn;
+	struct drm_device *drm;
+	struct drm_crtc *crtc;
+	int ret;
+
+	priv = drm_atomic_helper_connector_hdmi_init(test,
+						     BIT(HDMI_COLORSPACE_RGB),
+						     8);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+	conn = &priv->connector;
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NOT_NULL(test, preferred);
+
+	drm = &priv->drm;
+	crtc = priv->crtc;
+	ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	/* You shouldn't be doing that at home. */
+	conn->hdmi.funcs = &reject_connector_hdmi_funcs;
+
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
+
+	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state);
+
+	crtc_state->connectors_changed = true;
+
+	ret = drm_atomic_check_only(state);
+	KUNIT_EXPECT_LT(test, ret, 0);
+}
+
 static struct kunit_case drm_atomic_helper_connector_hdmi_check_tests[] = {
+	KUNIT_CASE(drm_test_check_hdmi_funcs_reject_rate),
 	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_tmds_char_rate_rgb_8bpc),

-- 
2.43.2