[PATCH 17/82] drm/amd/display: Test EDID quirks and ACPI EDID read

[<IVAN.LIPSKI@amd.com>]

From: Alex Hung <alex.hung@amd.com>

[WHAT]
Add KUnit tests for apply_edid_quirks() covering the two quirk entries
that had no coverage: the Apple Studio Display tile quirk and the Lenovo
G34w-30 FreeSync minimum refresh rate override. Both tests build an EDID
carrying the quirked panel ID and check the resulting dc_edid_caps panel
patch.

Add a KUnit test for dm_helpers_read_acpi_edid() that lets an eDP
connector reach drm_edid_read_custom() instead of returning early. The
probe callback finds no ACPI companion, so the helper returns NULL,
which covers the read and the failure return.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
---
 .../amdgpu_dm/tests/amdgpu_dm_helpers_test.c  | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)

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 5de697ca0fcce..89ce10d84f035 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
@@ -223,6 +223,38 @@ static void dm_test_apply_edid_quirks_unknown_noop(struct kunit *test)
 	KUNIT_EXPECT_FALSE(test, link->wa_flags.skip_phy_ssc_reduction);
 }
 
+/**
+ * dm_test_apply_edid_quirks_disable_second_tile - Test Apple Studio Display tile quirk
+ * @test: The KUnit test context
+ */
+static void dm_test_apply_edid_quirks_disable_second_tile(struct kunit *test)
+{
+	struct dc_edid_caps edid_caps = {0};
+	struct dc_link *link = dm_test_quirk_link(test);
+	struct edid *edid = dm_test_edid_with_panel_id(test,
+			drm_edid_encode_panel_id('A', 'P', 'P', 0xAE3A));
+
+	apply_edid_quirks(link, edid, &edid_caps);
+
+	KUNIT_EXPECT_TRUE(test, edid_caps.panel_patch.disable_second_tile);
+}
+
+/**
+ * dm_test_apply_edid_quirks_force_freesync_min_60 - Test Lenovo G34w-30 FreeSync min quirk
+ * @test: The KUnit test context
+ */
+static void dm_test_apply_edid_quirks_force_freesync_min_60(struct kunit *test)
+{
+	struct dc_edid_caps edid_caps = {0};
+	struct dc_link *link = dm_test_quirk_link(test);
+	struct edid *edid = dm_test_edid_with_panel_id(test,
+			drm_edid_encode_panel_id('L', 'E', 'N', 0x66F1));
+
+	apply_edid_quirks(link, edid, &edid_caps);
+
+	KUNIT_EXPECT_EQ(test, edid_caps.panel_patch.force_freesync_min_hz, 60U);
+}
+
 /* Tests for dm_helpers_parse_edid_caps() */
 
 /*
@@ -595,6 +627,25 @@ static void dm_test_read_acpi_edid_force_off(struct kunit *test)
 	KUNIT_EXPECT_NULL(test, dm_helpers_read_acpi_edid(aconnector));
 }
 
+/**
+ * dm_test_read_acpi_edid_panel_connector - Test the ACPI EDID read is attempted
+ * @test: The KUnit test context
+ *
+ * An eDP connector that is not forced off reaches drm_edid_read_custom(), whose
+ * probe callback finds no ACPI companion, so no EDID is returned.
+ */
+static void dm_test_read_acpi_edid_panel_connector(struct kunit *test)
+{
+	struct amdgpu_dm_connector *aconnector;
+	struct amdgpu_device *adev;
+
+	adev = dm_kunit_alloc_adev(test);
+	aconnector = dm_kunit_alloc_connector(test, adev, NULL);
+	aconnector->base.connector_type = DRM_MODE_CONNECTOR_eDP;
+
+	KUNIT_EXPECT_NULL(test, dm_helpers_read_acpi_edid(aconnector));
+}
+
 struct dm_test_vbios_edid {
 	struct dc_bios bios;
 	enum bp_result result;
@@ -3742,6 +3793,8 @@ static struct kunit_case amdgpu_dm_helpers_test_cases[] = {
 	KUNIT_CASE(dm_test_apply_edid_quirks_skip_phy_ssc),
 	KUNIT_CASE(dm_test_apply_edid_quirks_force_freesync_min),
 	KUNIT_CASE(dm_test_apply_edid_quirks_unknown_noop),
+	KUNIT_CASE(dm_test_apply_edid_quirks_disable_second_tile),
+	KUNIT_CASE(dm_test_apply_edid_quirks_force_freesync_min_60),
 	/* dm_helpers_parse_edid_caps */
 	KUNIT_CASE(dm_test_parse_edid_caps_null_edid),
 	KUNIT_CASE(dm_test_parse_edid_caps_null_caps),
@@ -3756,6 +3809,7 @@ static struct kunit_case amdgpu_dm_helpers_test_cases[] = {
 	KUNIT_CASE(dm_test_read_acpi_edid_debug_mask_disabled),
 	KUNIT_CASE(dm_test_read_acpi_edid_non_panel_connector),
 	KUNIT_CASE(dm_test_read_acpi_edid_force_off),
+	KUNIT_CASE(dm_test_read_acpi_edid_panel_connector),
 	KUNIT_CASE(dm_test_read_vbios_edid_non_embedded),
 	KUNIT_CASE(dm_test_read_vbios_edid_missing_callback),
 	KUNIT_CASE(dm_test_read_vbios_edid_callback_error),
-- 
2.43.0