[PATCH] tests/kms_vrr: Add a subtest for seamless modeset to a virtual LRR mode

[Manasi Navare]

This subtest validates LRR fastset functionality by testing seamless switching
without full modeset to any of the virtual LRR mode within VRR range.
Here we start from highest refresh rate mode and then switch to virtual LRR
modes in the steps of 10Hz within the VRR range.

This is used to test the LRR fastset functionality of the driver.

Cc: Drew Davenport <ddavenport at chromium.org>
Cc: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Sean Paul <seanpaul at chromium.org>
Signed-off-by: Manasi Navare <navaremanasi at chromium.org>
---
 tests/kms_vrr.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 67 insertions(+), 1 deletion(-)

diff --git a/tests/kms_vrr.c b/tests/kms_vrr.c
index 15c62b34b..79400aca9 100644
--- a/tests/kms_vrr.c
+++ b/tests/kms_vrr.c
@@ -70,6 +70,11 @@
  * Description: Oscillates between highest and lowest refresh each frame for
  *              manual flicker profiling
  *
+ * SUBTEST: seamless-virtual-rr-switch
+ * Description: Test to create a Virtual Mode in VRR range and switch to it
+ * without a full modeset.
+ * Functionality: LRR
+ *
  * SUBTEST: negative-basic
  * Description: Make sure that VRR should not be enabled on the Non-VRR panel.
  */
@@ -92,11 +97,13 @@ enum {
 	TEST_FASTSET = 1 << 6,
 	TEST_MAXMIN = 1 << 7,
 	TEST_NEGATIVE = 1 << 8,
+	TEST_SEAMLESS_VIRTUAL_RR = 1 << 9,
 };
 
 enum {
 	HIGH_RR_MODE,
 	LOW_RR_MODE,
+	VIRTUAL_RR_MODE,
 	RR_MODES_COUNT,
 };
 
@@ -214,6 +221,19 @@ low_rr_mode_with_same_res(igt_output_t *output, unsigned int vrr_min)
 	return mode;
 }
 
+static drmModeModeInfo
+virtual_rr_vrr_range_mode(igt_output_t *output, unsigned int virtual_refresh_rate)
+{
+	int i;
+	drmModeConnectorPtr connector = output->config.connector;
+	drmModeModeInfo mode = *igt_output_get_mode(output);
+	uint64_t clock_hz = mode.clock * 1000;
+
+	mode.vtotal = clock_hz / (mode.htotal * virtual_refresh_rate);
+	mode.vrefresh = virtual_refresh_rate;
+	return mode;
+}
+
 /* Read min and max vrr range from the connector debugfs. */
 static range_t
 get_vrr_range(data_t *data, igt_output_t *output)
@@ -641,6 +661,48 @@ test_seamless_rr_basic(data_t *data, enum pipe pipe, igt_output_t *output, uint3
 		     vrr ? "on" : "off", vrr ? "not reached" : "exceeded", result);
 }
 
+static void
+test_seamless_virtual_rr_basic(data_t *data, enum pipe pipe, igt_output_t *output, uint32_t flags)
+{
+	uint32_t result;
+	uint64_t rate;
+	unsigned int vrefresh;
+
+	igt_info("Use HIGH_RR Mode as default\n");
+	kmstest_dump_mode(&data->switch_modes[HIGH_RR_MODE]);
+
+	prepare_test(data, output, pipe);
+	rate = rate_from_refresh(data->switch_modes[HIGH_RR_MODE].vrefresh);
+
+	/*
+	 * Sink with DRR and VRR can be in downclock mode so
+	 * switch to highest refresh rate mode.
+	 */
+	igt_output_override_mode(output, &data->switch_modes[HIGH_RR_MODE]);
+	igt_assert(igt_display_try_commit_atomic(&data->display, DRM_MODE_PAGE_FLIP_EVENT, NULL) == 0);
+
+	result = flip_and_measure(data, output, pipe, rate, TEST_DURATION_NS);
+	igt_assert_f(result > 75,
+		     "Refresh rate (%u Hz) %"PRIu64"ns: Target threshold not reached, result was %u%%\n",
+		     data->switch_modes[HIGH_RR_MODE].vrefresh, rate, result);
+
+	/* Switch to Virtual RR */
+	for (vrefresh = data->range.min + 10; vrefresh < data->range.max; vrefresh += 10) {
+
+		data->switch_modes[VIRTUAL_RR_MODE] = virtual_rr_vrr_range_mode(output, vrefresh);
+		igt_info("Requesting Virtual Mode with Refresh Rate (%u Hz): \n", vrefresh);
+		kmstest_dump_mode(&data->switch_modes[VIRTUAL_RR_MODE]);
+		igt_output_override_mode(output, &data->switch_modes[VIRTUAL_RR_MODE]);
+		igt_assert(igt_display_try_commit_atomic(&data->display, 0, NULL) == 0);
+
+		rate = rate_from_refresh(vrefresh);
+		result = flip_and_measure(data, output, pipe, rate, TEST_DURATION_NS);
+		igt_assert_f(result > 75,
+			     "Refresh rate (%u Hz) %"PRIu64"ns: Target threshold not reached, result was %u%%\n",
+			     vrefresh, rate, result);
+	}
+}
+
 static void test_cleanup(data_t *data, enum pipe pipe, igt_output_t *output)
 {
 	if (vrr_capable(output))
@@ -686,7 +748,7 @@ static bool output_constraint(data_t *data, igt_output_t *output, uint32_t flags
 	igt_output_override_mode(output, &data->switch_modes[HIGH_RR_MODE]);
 
 	/* Search for a low refresh rate mode. */
-	if (!(flags & (TEST_SEAMLESS_VRR | TEST_SEAMLESS_DRRS)))
+	if (!(flags & (TEST_SEAMLESS_VRR | TEST_SEAMLESS_DRRS | TEST_SEAMLESS_VIRTUAL_RR)))
 		return true;
 
 	data->switch_modes[LOW_RR_MODE] = low_rr_mode_with_same_res(output, data->range.min);
@@ -841,6 +903,10 @@ igt_main_args("drs:", long_opts, help_str, opt_handler, &data)
 			     "between flip timestamps converges to the requested rate");
 		igt_subtest_with_dynamic("flip-basic-fastset")
 			run_vrr_test(&data, test_basic, TEST_FASTSET);
+
+		igt_describe("Test to switch to any custom virtual mode in VRR range without modeset.");
+		igt_subtest_with_dynamic("seamless-virtual-rr-switch")
+			run_vrr_test(&data, test_seamless_virtual_rr_basic, TEST_SEAMLESS_VIRTUAL_RR);
 	}
 
 	igt_fixture {
-- 
2.44.0.291.gc1ea87d7ee-goog