Hi,
On Thu, Jan 09, 2025 at 12:03:40AM +0200, Cristian Ciocaltea wrote:
> Following up a fixed bug in drm_atomic_helper_connector_hdmi_check(),
> discovered while unloading a DRM module, add a couple of tests to make
> sure the helper will not exhibit any abnormal behaviour for use cases
> that involve shutting down the connector's CRTC.
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 173 +++++++++++++++++++++
> 1 file changed, 173 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 c3b693bb966f1f8b04066d19f520bfa4bf11c23d..98187ecee5d77b5f758af29f4c4bfddbd1f658fd 100644
> --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> @@ -1568,6 +1568,177 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes
> KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB);
> }
>
> +/*
> + * Test that if we deactivate connector's CRTC, we trigger a mode change
> + * on that CRTC, along with setting {connectors|active}_changed.
> + */
> +static void drm_test_check_crtc_deactivate_mode_changed(struct kunit *test)
> +{
> + struct drm_atomic_helper_connector_hdmi_priv *priv;
> + struct drm_modeset_acquire_ctx *ctx;
> + struct drm_connector_state *old_conn_state;
> + struct drm_connector_state *new_conn_state;
> + struct drm_crtc_state *old_crtc_state;
> + struct drm_crtc_state *new_crtc_state;
> + struct drm_atomic_state *state;
> + struct drm_display_mode *preferred;
> + struct drm_connector *conn;
> + struct drm_device *drm;
> + struct drm_crtc *crtc;
> + int ret;
> +
> + priv = drm_kunit_helper_connector_hdmi_init(test,
> + BIT(HDMI_COLORSPACE_RGB),
> + 8);
> + KUNIT_ASSERT_NOT_NULL(test, priv);
> +
> + conn = &priv->connector;
> + KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi);
> +
> + ctx = drm_kunit_helper_acquire_ctx_alloc(test);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
> +
> + 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);
> +
> + state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
> +
> + new_conn_state = drm_atomic_get_connector_state(state, conn);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state);
> +
> + old_conn_state = drm_atomic_get_old_connector_state(state, conn);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_conn_state);
> +
> + new_crtc_state = drm_atomic_get_crtc_state(state, crtc);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_crtc_state);
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_crtc_state);
> +
> + ret = drm_atomic_set_mode_for_crtc(new_crtc_state, NULL);
> + KUNIT_EXPECT_EQ(test, ret, 0);
> + KUNIT_ASSERT_NE(test, old_crtc_state->enable, new_crtc_state->enable);
> +
> + new_crtc_state->active = false;
> + KUNIT_ASSERT_NE(test, old_crtc_state->active, new_crtc_state->active);
> +
> + ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + KUNIT_ASSERT_PTR_NE(test, old_conn_state->crtc, new_conn_state->crtc);
> +
> + ret = drm_atomic_check_only(state);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_crtc_state);
> + KUNIT_EXPECT_TRUE(test, new_crtc_state->mode_changed);
> + KUNIT_EXPECT_TRUE(test, new_crtc_state->connectors_changed);
> + KUNIT_EXPECT_TRUE(test, new_crtc_state->active_changed);
> +}
This one looks good to me
> +/*
> + * Test that if we deactivate connector's CRTC, while changing the max
> + * bpc property to a different value, will not have any effect on the
> + * output bpc property. However, we still trigger a mode change on that
> + * CRTC, along with setting {connectors|active}_changed.
> + */
> +static void drm_test_check_crtc_deactivate_output_bpc_not_changed(struct kunit *test)
> +{
> + struct drm_atomic_helper_connector_hdmi_priv *priv;
> + struct drm_modeset_acquire_ctx *ctx;
> + struct drm_connector_state *old_conn_state;
> + struct drm_connector_state *new_conn_state;
> + struct drm_crtc_state *old_crtc_state;
> + struct drm_crtc_state *new_crtc_state;
> + struct drm_atomic_state *state;
> + struct drm_display_mode *preferred;
> + struct drm_connector *conn;
> + struct drm_device *drm;
> + struct drm_crtc *crtc;
> + int ret;
> +
> + priv = drm_kunit_helper_connector_hdmi_init(test,
> + BIT(HDMI_COLORSPACE_RGB),
> + 10);
> + KUNIT_ASSERT_NOT_NULL(test, priv);
> +
> + conn = &priv->connector;
> + ret = set_connector_edid(test, conn,
> + test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
> + ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
> + KUNIT_ASSERT_GT(test, ret, 0);
> +
> + ctx = drm_kunit_helper_acquire_ctx_alloc(test);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
> +
> + 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);
> +
> + state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
> +
> + new_conn_state = drm_atomic_get_connector_state(state, conn);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state);
> +
> + old_conn_state = drm_atomic_get_old_connector_state(state, conn);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_conn_state);
> +
> + new_conn_state->max_requested_bpc = 8;
> +
> + KUNIT_ASSERT_NE(test,
> + old_conn_state->max_requested_bpc,
> + new_conn_state->max_requested_bpc);
> +
> + new_crtc_state = drm_atomic_get_crtc_state(state, crtc);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_crtc_state);
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_crtc_state);
> +
> + ret = drm_atomic_set_mode_for_crtc(new_crtc_state, NULL);
> + KUNIT_EXPECT_EQ(test, ret, 0);
> + KUNIT_ASSERT_NE(test, old_crtc_state->enable, new_crtc_state->enable);
> +
> + new_crtc_state->active = false;
> + KUNIT_ASSERT_NE(test, old_crtc_state->active, new_crtc_state->active);
> +
> + ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + KUNIT_ASSERT_PTR_NE(test, old_conn_state->crtc, new_conn_state->crtc);
> +
> + ret = drm_atomic_check_only(state);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + old_conn_state = drm_atomic_get_old_connector_state(state, conn);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_conn_state);
> +
> + new_conn_state = drm_atomic_get_new_connector_state(state, conn);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state);
> +
> + KUNIT_EXPECT_EQ(test,
> + old_conn_state->hdmi.output_bpc,
> + new_conn_state->hdmi.output_bpc);
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_crtc_state);
> + KUNIT_EXPECT_TRUE(test, new_crtc_state->mode_changed);
> + KUNIT_EXPECT_TRUE(test, new_crtc_state->connectors_changed);
> + KUNIT_EXPECT_TRUE(test, new_crtc_state->active_changed);
> +}
> +
However, it's not clear to me why changing bpc should change anything,
or why it's worth testing?
Maxime
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