[igt-dev] [PATCH i-g-t v3] tests/i915/i915_pm_dc: Add DC9 igt test

[Jigar Bhatt]

DC9 igt test validation depends on DC9 Ready and 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 "DC9 Ready"
from  i915_pm_req_res_info debugfs and DC{5,6} counter reset method to validate DC9.

Signed-off-by: Jigar Bhatt <jigar.bhatt at intel.com>
---
 tests/i915/i915_pm_dc.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tests/i915/i915_pm_dc.c b/tests/i915/i915_pm_dc.c
index 30c6024..957d04a 100644
--- a/tests/i915/i915_pm_dc.c
+++ b/tests/i915/i915_pm_dc.c
@@ -384,6 +384,27 @@ 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)
+{
+        char buf[4096];
+        igt_skip_on_f(!igt_debugfs_simple_read(debugfs_fd, "i915_pm_req_res_info", buf, sizeof(buf)),"skipping DC9 test");
+        igt_assert_f(strstr(buf, "DC9 Ready : yes"),"DC9 is not ready");
+        /*
+         * 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),3000,100);
+}
+static void test_dc9_dpms(data_t *data)
+{
+        require_dc_counter(data->debugfs_fd, CHECK_DC5);
+        require_dc_counter(data->debugfs_fd, CHECK_DC6);
+        int dc5_prev=read_dc_counter(data->debugfs_fd, CHECK_DC5);
+        int dc6_prev=read_dc_counter(data->debugfs_fd, CHECK_DC6);
+        dpms_off(data);
+        igt_assert_f(check_dc9(data->debugfs_fd,dc5_prev,dc6_prev),"\n Not in DC9");
+        dpms_on(data);
+}
 IGT_TEST_DESCRIPTION("These tests validate Display Power DC states");
 int main(int argc, char *argv[])
 {
@@ -449,6 +470,10 @@ 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