[igt-dev] [PATCH i-g-t v2] tests/i915/i915_pm_dc: Add DC9 igt test Function

[Jigar Bhatt]

From: jbhatt <jigar.bhatt at intel.com>

test_dc9_dpms is getting DC5 and,
DC6 values and pass through function check_dc9.
Function check_dc9 is responsible for dpms off,
getting recent values of DC5 and DC6 and,
checking whether they decremented or not.
Finally checking DC9 is ready or not with yes or no.

Signed-off-by: jbhatt <jigar.bhatt at intel.com>
---
 tests/i915/i915_pm_dc.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tests/i915/i915_pm_dc.c b/tests/i915/i915_pm_dc.c
index 30c6024..60d3434 100644
--- a/tests/i915/i915_pm_dc.c
+++ b/tests/i915/i915_pm_dc.c
@@ -384,6 +384,30 @@ 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];
+        char *str;
+        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 = "),"DC9 is not ready");
+        str = strstr(buf, "DC9 Ready = ");
+        igt_assert_f((str&&strlen(str)>12&&str[12]=='y'&&strstr(str,"yes")), "DC9 is not ready\n");
+        /*
+         * 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 +473,10 @@ 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