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drm/vc4: tests: Document output handling functions

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vc4_mock_atomic_add_output() and vc4_mock_atomic_del_output() are public
but aren't documented. Let's provide the documentation.

In particular, special care should be taken to deal with EDEADLK.

Reviewed-by: Maíra Canal <mcanal@igalia.com>
Link: https://lore.kernel.org/r/20250403-drm-vc4-kunit-failures-v2-2-e09195cc8840@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Maxime Ripard
2025-04-03 15:33:31 +02:00
parent 9e26a3740c
commit 321e644716
1 changed files with 26 additions and 0 deletions
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26
drivers/gpu/drm/vc4/tests/vc4_mock_output.c
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@@ -61,6 +61,19 @@ static const struct drm_display_mode default_mode = {
DRM_SIMPLE_MODE(640, 480, 64, 48)
};
/**
* vc4_mock_atomic_add_output() - Enables an output in a state
* @test: The test context object
* @state: Atomic state to enable the output in.
* @type: Type of the output encoder
*
* Adds an output CRTC and connector to a state, and enables them.
*
* Returns:
* 0 on success, a negative error code on failure. If the error is
* EDEADLK, the entire atomic sequence must be restarted. All other
* errors are fatal.
*/
int vc4_mock_atomic_add_output(struct kunit *test,
struct drm_atomic_state *state,
enum vc4_encoder_type type)
@@ -105,6 +118,19 @@ int vc4_mock_atomic_add_output(struct kunit *test,
return 0;
}
/**
* vc4_mock_atomic_del_output() - Disables an output in a state
* @test: The test context object
* @state: Atomic state to disable the output in.
* @type: Type of the output encoder
*
* Adds an output CRTC and connector to a state, and disables them.
*
* Returns:
* 0 on success, a negative error code on failure. If the error is
* EDEADLK, the entire atomic sequence must be restarted. All other
* errors are fatal.
*/
int vc4_mock_atomic_del_output(struct kunit *test,
struct drm_atomic_state *state,
enum vc4_encoder_type type)