[PATCH 20/82] drm/amd/display: Test dm_helpers_submit_i2c_over_aux

From: Alex Hung <[email protected]>

[WHAT]
Add a KUnit test for dm_helpers_submit_i2c_over_aux(), which is still an
unimplemented stub, to pin down that it reports failure.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <[email protected]>
Signed-off-by: Alex Hung <[email protected]>
Signed-off-by: Ivan Lipski <[email protected]>
---
 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c    |  1 +
 .../amdgpu_dm/tests/amdgpu_dm_helpers_test.c     | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index b05455498cbf6..29f254cafae4e 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -1927,3 +1927,4 @@ bool dm_helpers_submit_i2c_over_aux(struct ddc_service *ddc, uint32_t address, u
 	//TODO: Implement this
 	return false;
 }
+EXPORT_IF_KUNIT(dm_helpers_submit_i2c_over_aux);
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_helpers_test.c b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_helpers_test.c
index 6b4f6993ace94..0314ebb5c8aea 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_helpers_test.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_helpers_test.c
@@ -3892,6 +3892,20 @@ static void dm_test_dp_handle_test_pattern_no_pipe(struct kunit *test)
 							       test_params));
 }
 
+/* Tests for dm_helpers_submit_i2c_over_aux() */
+
+/**
+ * dm_test_submit_i2c_over_aux_unimplemented - Test the unimplemented stub returns false
+ * @test: The KUnit test context
+ */
+static void dm_test_submit_i2c_over_aux_unimplemented(struct kunit *test)
+{
+	u8 buffer[1] = { 0 };
+
+	KUNIT_EXPECT_FALSE(test, dm_helpers_submit_i2c_over_aux(NULL, 0x50, 0, buffer,
+								sizeof(buffer), true));
+}
+
 static struct kunit_case amdgpu_dm_helpers_test_cases[] = {
 	/* edid_extract_panel_id */
 	KUNIT_CASE(dm_test_edid_extract_panel_id_basic),
@@ -4080,6 +4094,8 @@ static struct kunit_case amdgpu_dm_helpers_test_cases[] = {
 	KUNIT_CASE(dm_test_dp_write_dsc_enable_pcon_disable),
 	/* dm_helpers_dp_handle_test_pattern_request */
 	KUNIT_CASE(dm_test_dp_handle_test_pattern_no_pipe),
+	/* dm_helpers_submit_i2c_over_aux */
+	KUNIT_CASE(dm_test_submit_i2c_over_aux_unimplemented),
 	{}
 };
 
-- 
2.43.0