[igt-dev] [PATCH i-g-t 1/2] tests/i915/i915_pm_dc: Add DC6 DPMS test for mtl

[Mohammed Thasleem]

The flow for DC6 validation has changed for MTL.
DC6 state achieved based on PKGC10 entry.
This test validates PKGC10 entry and confirm DC6 achieved

Signed-off-by: Mohammed Thasleem <mohammed.thasleem at intel.com>
---
 tests/i915/i915_pm_dc.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/tests/i915/i915_pm_dc.c b/tests/i915/i915_pm_dc.c
index 1c695b50..322a0c60 100644
--- a/tests/i915/i915_pm_dc.c
+++ b/tests/i915/i915_pm_dc.c
@@ -45,6 +45,7 @@
 #define PWR_DOMAIN_INFO "i915_power_domain_info"
 #define RPM_STATUS "i915_runtime_pm_status"
 #define KMS_HELPER "/sys/module/drm_kms_helper/parameters/"
+#define PACKAGE_STATE_PATH "/sys/kernel/debug/pmc_core/"
 #define KMS_POLL_DISABLE 0
 #define DC9_RESETS_DC_COUNTERS(devid) (!(IS_DG1(devid) || IS_DG2(devid)))
 
@@ -60,6 +61,7 @@ typedef struct {
 	int drm_fd;
 	int msr_fd;
 	int debugfs_fd;
+	int pmc_fd;
 	uint32_t devid;
 	char *debugfs_dump;
 	igt_display_t display;
@@ -519,6 +521,36 @@ static int has_panels_without_dc_support(igt_display_t *display)
 	return external_panel;
 }
 
+static unsigned int read_pkc_state_value(int pmc_fd)
+{
+	char buf[4096];
+	char *str;
+
+	igt_require((pmc_fd = open(PACKAGE_STATE_PATH, O_RDONLY)) >= 0);
+
+	igt_debugfs_simple_read(pmc_fd, "package_cstate_show",
+				buf, sizeof(buf));
+	igt_skip_on_f(!strstr(buf, "Package C10"),
+		      "PK10 will be not supported.\n");
+	str = strstr(buf, "Package C10");
+	igt_assert_f(str, "PKC10 value not available\n");
+
+	return get_dc_counter(str);
+}
+
+static void test_pkc_state_dpms(data_t *data)
+{
+	unsigned int timeout_msec = 30;
+	unsigned int prev_value = 0, cur_value = 0;
+
+	prev_value = read_pkc_state_value(data->pmc_fd);
+	dpms_off(data);
+	igt_wait((cur_value = read_pkc_state_value(data->pmc_fd)),
+		  timeout_msec * 1000, 100);
+	igt_assert_f(cur_value > prev_value, "PK10 is not achieived.\n");
+	dpms_on(data);
+}
+
 static void kms_poll_state_restore(int sig)
 {
 	int sysfs_fd;
@@ -600,7 +632,11 @@ igt_main
 	igt_subtest("dc6-dpms") {
 		igt_require_f(igt_pm_pc8_plus_residencies_enabled(data.msr_fd),
 			      "PC8+ residencies not supported\n");
-		test_dc_state_dpms(&data, CHECK_DC6);
+		if (intel_display_ver(data.devid) == 14)
+			test_pkc_state_dpms(&data);
+		else
+			test_dc_state_dpms(&data, CHECK_DC6);
+
 	}
 
 	igt_describe("This test validates display engine entry to DC9 state");
-- 
2.25.1