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

Maxime Ripard
2024-02-22T18:19:36Z

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@raspberrypi.com>
Signed-off-by: Maxime Ripard <mripard@kernel.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