[PATCH i-g-t v6 4/7] tests/kms_vrr: Add new test for DC3CO validation with LOBF

[Jeevan B <jeevan.b@intel.com>]

Add lobf-dc3co subtest to validate DC3CO entry during link-off
between frames.

v2: Fix the flow logic.

Signed-off-by: Jeevan B <jeevan.b@intel.com>
Reviewed-by: Mohammed Thasleem <mohammed.thasleem@intel.com>
---
 tests/kms_vrr.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tests/kms_vrr.c b/tests/kms_vrr.c
index 6043d40f1..82eb8554a 100644
--- a/tests/kms_vrr.c
+++ b/tests/kms_vrr.c
@@ -29,6 +29,7 @@
  */
 
 #include "igt.h"
+#include "igt_pm.h"
 #include "igt_psr.h"
 #include "i915/intel_drrs.h"
 #include "sw_sync.h"
@@ -76,6 +77,9 @@
  *
  * SUBTEST: negative-basic
  * Description: Make sure that VRR should not be enabled on the Non-VRR panel.
+ *
+ * SUBTEST: lobf-dc3co
+ * Description: Test DC3CO entry during LOBF.
  */
 
 #define NSECS_PER_SEC (1000000000ull)
@@ -873,6 +877,25 @@ test_lobf(data_t *data, igt_crtc_t *crtc, igt_output_t *output,
 	igt_assert_f(lobf_enabled, "LOBF not enabled\n");
 }
 
+static void test_lobf_dc3co(data_t *data, igt_crtc_t *crtc,
+			    igt_output_t *output, uint32_t flags)
+{
+	unsigned long dc3co_count_before, dc3co_count_after;
+
+	dc3co_count_before = igt_read_dc_counter(data->debugfs_fd,
+						 IGT_INTEL_CHECK_DC3CO);
+
+	test_lobf(data, crtc, output, flags);
+
+	dc3co_count_after = igt_read_dc_counter(data->debugfs_fd,
+						IGT_INTEL_CHECK_DC3CO);
+
+	igt_assert_f(dc3co_count_after > dc3co_count_before,
+		     "DC3CO should be entered during link-off periods. "
+		     "Before: %lu, After: %lu\n",
+		     dc3co_count_before, dc3co_count_after);
+}
+
 static void test_cleanup(data_t *data, igt_crtc_t *crtc, igt_output_t *output)
 {
 	igt_crtc_set_prop_value(crtc,
@@ -1112,6 +1135,17 @@ int igt_main_args("drs:", long_opts, help_str, opt_handler, &data)
 
 			run_vrr_test(&data, test_lobf, TEST_LINK_OFF);
 		}
+
+		igt_describe("This test validates DC3CO entry during LOBF (Link-Off Between "
+			     "Frames) periods while VRR is active and PSR is disabled.");
+
+		igt_subtest_with_dynamic("lobf-dc3co") {
+			igt_require(intel_display_ver(intel_get_drm_devid(data.drm_fd)) >= 35);
+
+			igt_require_dc_counter(data.debugfs_fd, IGT_INTEL_CHECK_DC3CO);
+
+			run_vrr_test(&data, test_lobf_dc3co, TEST_LINK_OFF);
+		}
 	}
 
 	igt_fixture() {
-- 
2.43.0