[igt-dev] [PATCH v3 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

v2: - Removed varisable to store disp version. (Vinod)
v3: - Used igt_debugfs_mount to open the path. (Imre)
    - Updated string in igt_skip_on_f. (Imre)
    - Removed redundant code. (Imre)
    - Set test execution for display for version >=14. (Imre)
    - Rename function read_pkc_state_value with pkgc. (Imre)
    - Added runtime PM disabled and enable. (Imre).
    - During testing the entry always happened in ~4.5ses, so
      set max igt_wait to 5sec.

Signed-off-by: Mohammed Thasleem <mohammed.thasleem at intel.com>
---
 tests/i915/i915_pm_dc.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/tests/i915/i915_pm_dc.c b/tests/i915/i915_pm_dc.c
index 1c695b50..2da415e8 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 "pmc_core/package_cstate_show"
 #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 +521,34 @@ static int has_panels_without_dc_support(igt_display_t *display)
 	return external_panel;
 }
 
+static unsigned int pkgc(int pmc_fd)
+{
+	char buf[4096];
+	char *str;
+
+	pmc_fd = open(igt_debugfs_mount(), O_RDONLY);
+	igt_debugfs_simple_read(pmc_fd, PACKAGE_STATE_PATH, buf, sizeof(buf));
+	str = strstr(buf, "Package C10");
+	igt_skip_on_f(!strstr(buf, "Package C10"), "PKGC10 is not supported.\n");
+	close(pmc_fd);
+
+	return get_dc_counter(str);
+}
+
+static void test_pkc_state_dpms(data_t *data)
+{
+	unsigned int timeout_sec = 5;
+	unsigned int prev_value = 0, cur_value = 0;
+
+	prev_value = pkgc(data->pmc_fd);
+	setup_dc_dpms(data);
+	dpms_off(data);
+	igt_wait((cur_value = pkgc(data->pmc_fd)) > prev_value, timeout_sec * 1000, 100);
+	igt_assert_f(cur_value > prev_value, "PK10 is not achieived.\n");
+	dpms_on(data);
+	cleanup_dc_dpms(data);
+}
+
 static void kms_poll_state_restore(int sig)
 {
 	int sysfs_fd;
@@ -600,7 +630,11 @@ 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