[PATCH i-g-t 2/2] RFC: tests/kms_vrr: Add new test to validate LOBF

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

Validate pseudo static refresh rate changes in the VRR with
fixed refresh rate framework.

Signed-off-by: Jeevan B <jeevan.b@intel.com>
---
 tests/kms_vrr.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/tests/kms_vrr.c b/tests/kms_vrr.c
index 2ea90cd8e..2134e8668 100644
--- a/tests/kms_vrr.c
+++ b/tests/kms_vrr.c
@@ -37,6 +37,11 @@
 #include <signal.h>
 
 /**
+ * SUBTEST: lobf
+ * Description: Test to validate link-off between active frames in non-psr
+ *              operation
+ * Functionality: LOBF
+ *
  * SUBTEST: cmrr
  * Description: Test to validate the content rate to exactly match with the
  * 		requested rate without any frame drops.
@@ -106,7 +111,8 @@ enum {
 	TEST_FASTSET = 1 << 7,
 	TEST_MAXMIN = 1 << 8,
 	TEST_CMRR = 1 << 9,
-	TEST_NEGATIVE = 1 << 10,
+	TEST_LINK_OFF = 1 << 10,
+	TEST_NEGATIVE = 1 << 11,
 };
 
 enum {
@@ -784,6 +790,41 @@ test_seamless_virtual_rr_basic(data_t *data, enum pipe pipe, igt_output_t *outpu
 	}
 }
 
+static void
+test_lobf(data_t *data, enum pipe pipe, igt_output_t *output, uint32_t flags)
+{
+	bool change_mode = false;
+	time_t startTime = time(NULL);
+	time_t secs = 4, change_time = 3;
+	igt_plane_t *primary;
+	drmModeModeInfo mode = *igt_output_get_mode(output);
+
+	igt_info("LOBF test execution on %s, PIPE %s with VRR range: (%u-%u) Hz\n",
+		 output->name, kmstest_pipe_name(pipe), data->range.min, data->range.max);
+
+	igt_require(output->config.connector->connector_type == DRM_MODE_CONNECTOR_eDP);
+	igt_require(!igt_get_i915_edp_lobf_info(data->drm_fd, output->name));
+
+	primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+	igt_create_color_fb(data->drm_fd, mode.hdisplay, mode.vdisplay,
+			    DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_LINEAR,
+			    1, 1, 1, &data->fb[0]);
+
+	igt_output_override_mode(output, &data->switch_modes[HIGH_RR_MODE]);
+
+	while (time(NULL) - startTime < secs) {
+		igt_plane_set_fb(primary, &data->fb[0]);
+		igt_display_commit(&data->display);
+		if (!change_mode && time(NULL) - startTime >= change_time) {
+			igt_output_override_mode(output, &data->switch_modes[LOW_RR_MODE]);
+			change_time = true;
+		}
+	}
+
+	igt_assert_f(igt_get_i915_edp_lobf_info(data->drm_fd, output->name),
+		     "LOBF not enabled\n");
+}
+
 static void
 test_cmrr(data_t *data, enum pipe pipe, igt_output_t *output, uint32_t flags)
 {
@@ -1030,13 +1071,20 @@ igt_main_args("drs:", long_opts, help_str, opt_handler, &data)
 		igt_subtest_with_dynamic("seamless-rr-switch-virtual")
 			run_vrr_test(&data, test_seamless_virtual_rr_basic, TEST_SEAMLESS_VIRTUAL_RR);
 
-		igt_describe("Test to validate the the content rate exactly match with the "
+		igt_describe("Test to validate the content rate exactly match with the "
 			     "requested rate without any frame drops.");
 		igt_subtest_with_dynamic("cmrr") {
 			igt_require(intel_display_ver(intel_get_drm_devid(data.drm_fd)) >= 20);
 
 			run_vrr_test(&data, test_cmrr, TEST_CMRR);
 		}
+		igt_describe("Test to validate the link-off between active frames in "
+			     "non-PSR operation.");
+		igt_subtest_with_dynamic("lobf") {
+			igt_require(intel_display_ver(intel_get_drm_devid(data.drm_fd)) >= 20);
+
+			run_vrr_test(&data, test_lobf, TEST_LINK_OFF);
+		}
 	}
 
 	igt_fixture {
-- 
2.25.1