[igt-dev] [PATCH i-g-t v7] tests/i915/i915_pm_dc: Add DC9 igt test

[Jigar Bhatt]

DC9 igt test validation depends on DC{5,6} counters reset.
When Display Engine enters to DC9, it resets DMC f/w and DC5/DC6 counter.
We don't have a DC9 counter unlike DC{5,6},
therefore this tests uses DC{5,6} counter reset method to validate DC9.

v7: [Anshuman]
- Skip if no support of DC6.

v6: [Anshuman]
- assert for DC6 counter in setup_dc9_dpms.
- Move  dpms_off() to test_dc9_dpms().

Signed-off-by: Jigar Bhatt <jigar.bhatt at intel.com>
---
 tests/i915/i915_pm_dc.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/tests/i915/i915_pm_dc.c b/tests/i915/i915_pm_dc.c
index 30c6024..b6d918e 100644
--- a/tests/i915/i915_pm_dc.c
+++ b/tests/i915/i915_pm_dc.c
@@ -384,6 +384,40 @@ static void test_dc_state_dpms(data_t *data, int dc_flag)
 	cleanup_dc_dpms(data);
 }
 
+static bool check_dc9(uint32_t debugfs_fd, int prev_dc5, int prev_dc6, int seconds)
+{
+	/*
+	 * since we do not have DC9 Counter,
+	 * so we rely on dc5/dc6 counter reset to check if Display Engine was in DC9.
+	 */
+	return igt_wait((read_dc_counter(debugfs_fd, CHECK_DC5) > prev_dc5 ||
+			read_dc_counter(debugfs_fd, CHECK_DC6) > prev_dc6), seconds, 100);
+}
+static void setup_dc9_dpms(data_t *data, int prev_dc5, int prev_dc6)
+{
+	igt_disable_runtime_pm();
+	data->runtime_suspend_disabled = true;
+	dpms_off(data);
+	igt_skip_on_f(igt_wait((read_dc_counter(data->debugfs_fd, CHECK_DC5) > prev_dc5 ||
+				read_dc_counter(data->debugfs_fd, CHECK_DC6) > prev_dc6),
+				1000, 100), "No support of DC6\n");
+	dpms_on(data);
+	data->runtime_suspend_disabled = false;
+	igt_restore_runtime_pm();
+	igt_setup_runtime_pm(data->drm_fd);
+
+}
+static void test_dc9_dpms(data_t *data)
+{
+	require_dc_counter(data->debugfs_fd, CHECK_DC5);
+	setup_dc9_dpms(data, read_dc_counter(data->debugfs_fd, CHECK_DC5),
+			read_dc_counter(data->debugfs_fd, CHECK_DC6));
+	dpms_off(data);
+	igt_assert_f(!check_dc9(data->debugfs_fd, read_dc_counter(data->debugfs_fd, CHECK_DC5),
+			read_dc_counter(data->debugfs_fd, CHECK_DC6), 3000), "Not in DC9\n");
+	dpms_on(data);
+}
+
 IGT_TEST_DESCRIPTION("These tests validate Display Power DC states");
 int main(int argc, char *argv[])
 {
@@ -449,6 +483,10 @@ int main(int argc, char *argv[])
 		test_dc_state_dpms(&data, CHECK_DC6);
 	}
 
+	igt_describe("This test validates display engine entry to DC9 state");
+	igt_subtest("dc9-dpms") {
+		test_dc9_dpms(&data);
+	}
 	igt_fixture {
 		free(data.pwr_dmn_info);
 		close(data.debugfs_fd);
-- 
2.8.1