linux-kernel - [PATCH 2/4] drm/vc4: tests: Document output handling functions

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Message-Id: <20250318-drm-vc4-kunit-failures-v1-2-779864d9ab37@kernel.org>
Date: Tue, 18 Mar 2025 15:17:38 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Dave Stevenson <dave.stevenson@...pberrypi.com>, 
 Maíra Canal <mcanal@...lia.com>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 2/4] drm/vc4: tests: Document output handling functions

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

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

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/vc4/tests/vc4_mock_output.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/vc4/tests/vc4_mock_output.c b/drivers/gpu/drm/vc4/tests/vc4_mock_output.c
index f0ddc223c1f839e8a14f37fdcbb72e7b2c836aa1..577d9a9563696791632aec614c381a214886bf27 100644
--- a/drivers/gpu/drm/vc4/tests/vc4_mock_output.c
+++ b/drivers/gpu/drm/vc4/tests/vc4_mock_output.c
@@ -59,10 +59,23 @@ struct vc4_dummy_output *vc4_dummy_output(struct kunit *test,
 
 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)
 {
 	struct drm_device *drm = state->dev;
@@ -103,10 +116,23 @@ int vc4_mock_atomic_add_output(struct kunit *test,
 	crtc_state->active = true;
 
 	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)
 {
 	struct drm_device *drm = state->dev;

-- 
2.48.1