[PATCH 39/70] drm/amd/display: add CRC source list KUnit coverage

From: Alex Hung <[email protected]>

[WHAT]
Expose amdgpu_dm_crtc_get_crc_sources() for KUnit and add a test that
verifies the returned static source-name list and its count. This is the
accessor used by the debugfs CRC control interface.

Assisted-by: Copilot:Claude-Opus-4.8 GPT-5.5
Reviewed-by: Bhawanpreet Lakha <[email protected]>
Signed-off-by: Alex Hung <[email protected]>
Signed-off-by: Wayne Lin <[email protected]>
---
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c |  1 +
 .../amdgpu_dm/tests/amdgpu_dm_crc_test.c      | 26 +++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c
index 1f9528364e53..630dea3487b3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c
@@ -152,6 +152,7 @@ const char *const *amdgpu_dm_crtc_get_crc_sources(struct drm_crtc *crtc,
 	*count = ARRAY_SIZE(pipe_crc_sources);
 	return pipe_crc_sources;
 }
+EXPORT_IF_KUNIT(amdgpu_dm_crtc_get_crc_sources);
 
 #ifdef CONFIG_DRM_AMD_SECURE_DISPLAY
 static void update_phy_id_mapping(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_crc_test.c b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_crc_test.c
index a6fd3a6fd803..88f7a15853e8 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_crc_test.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_crc_test.c
@@ -95,6 +95,30 @@ static void dm_test_is_valid_crc_source(struct kunit *test)
 	KUNIT_EXPECT_FALSE(test, amdgpu_dm_is_valid_crc_source(AMDGPU_DM_PIPE_CRC_SOURCE_INVALID));
 }
 
+/**
+ * dm_test_crtc_get_crc_sources() - Test available CRC source strings.
+ * @test: KUnit test context.
+ *
+ * Verifies that amdgpu_dm_crtc_get_crc_sources() returns the static source
+ * list and reports all debugfs source names.
+ */
+static void dm_test_crtc_get_crc_sources(struct kunit *test)
+{
+	const char *const *sources;
+	size_t count = 0;
+
+	sources = amdgpu_dm_crtc_get_crc_sources(NULL, &count);
+
+	KUNIT_ASSERT_NOT_NULL(test, sources);
+	KUNIT_EXPECT_EQ(test, count, 6);
+	KUNIT_EXPECT_STREQ(test, sources[0], "none");
+	KUNIT_EXPECT_STREQ(test, sources[1], "crtc");
+	KUNIT_EXPECT_STREQ(test, sources[2], "crtc dither");
+	KUNIT_EXPECT_STREQ(test, sources[3], "dprx");
+	KUNIT_EXPECT_STREQ(test, sources[4], "dprx dither");
+	KUNIT_EXPECT_STREQ(test, sources[5], "auto");
+}
+
 /**
  * dm_test_need_dp_aux() - Test dm_need_dp_aux().
  * @test: KUnit test context.
@@ -222,6 +246,8 @@ static struct kunit_case dm_crc_test_cases[] = {
 	KUNIT_CASE(dm_test_need_crc_dither),
 	/* amdgpu_dm_is_valid_crc_source() */
 	KUNIT_CASE(dm_test_is_valid_crc_source),
+	/* amdgpu_dm_crtc_get_crc_sources() */
+	KUNIT_CASE(dm_test_crtc_get_crc_sources),
 	/* dm_need_dp_aux() */
 	KUNIT_CASE(dm_test_need_dp_aux),
 	/* dm_crc_source_should_start_dprx() */
-- 
2.43.0