[igt-dev] [PATCH i-g-t v5 4/5] tests/i915/i915_pm_dc: Modify dc9 test

[Swati Sharma]

Existing dc9 test is modified. Added new condition,
runtime_suspended_time value should increases when system
enters dc9. This condition will be checked for both igfx
and dgfx whereas existing condition where we wait for
dc counter to reset is limited only to igfx.

v3: -changed test design (imre)
v4: -var name changed (imre)
    -restricted counter reset condition to dg1 and dg2
     platforms only (anshuman)
    -swapped rpm vs dc9 wait order condition (imre)
v5: -add macro DC9_RESETS_DC_COUNTERS (imre)
    -combine both polling (imre)
    -moved is_dgfx() realignment into patch 2/4 (imre)
    -s/seconds/msecs/ (imre)

Signed-off-by: Swati Sharma <swati2.sharma at intel.com>
---
 tests/i915/i915_pm_dc.c | 54 ++++++++++++++++++++++++++++-------------
 1 file changed, 37 insertions(+), 17 deletions(-)

diff --git a/tests/i915/i915_pm_dc.c b/tests/i915/i915_pm_dc.c
index bd4522275..142975e6c 100644
--- a/tests/i915/i915_pm_dc.c
+++ b/tests/i915/i915_pm_dc.c
@@ -31,8 +31,11 @@
 #include "igt_kmod.h"
 #include "igt_psr.h"
 #include "igt_sysfs.h"
+#include "igt_device.h"
+#include "igt_device_scan.h"
 #include "limits.h"
 #include "time.h"
+#include "igt_pm.h"
 
 /* DC State Flags */
 #define CHECK_DC5	(1 << 0)
@@ -43,6 +46,7 @@
 #define RPM_STATUS "i915_runtime_pm_status"
 #define KMS_HELPER "/sys/module/drm_kms_helper/parameters/"
 #define KMS_POLL_DISABLE 0
+#define DC9_RESETS_DC_COUNTERS(devid) !(IS_DG1(devid) || IS_DG2(devid))
 
 IGT_TEST_DESCRIPTION("Tests to validate display power DC states.");
 
@@ -416,42 +420,58 @@ static bool support_dc6(int debugfs_fd)
 	return strstr(buf, "DC5 -> DC6 count");
 }
 
-static bool dc9_wait_entry(uint32_t debugfs_fd, int dc_target, int prev_dc, int seconds)
+static int read_runtime_suspended_time(int drm_fd)
 {
-	/*
-	 * since we do not have DC9 counter,
-	 * so we rely on dc5/dc6 counter reset to check if display engine was in DC9.
+	struct pci_device *i915;
+	int ret;
+
+	i915 = igt_device_get_pci_device(drm_fd);
+	ret = igt_pm_get_runtime_suspended_time(i915);
+	igt_assert_lte(0, ret);
+
+	return ret;
+}
+
+static bool dc9_wait_entry(data_t *data, int dc_target, int prev_dc, int prev_rpm, int msecs)
+{
+	/* runtime suspended residency should increment once DC9 is achieved;
+	 * this condition is valid for all platforms.
+	 * however, resetting of dc5/dc6 counter to check if display engine was in DC9;
+	 * this condition at present can be skipped for dg1 and dg2 platforms.
 	 */
-	return igt_wait(read_dc_counter(debugfs_fd, dc_target) <
-			prev_dc, seconds, 100);
+	return igt_wait((read_runtime_suspended_time(data->drm_fd) > prev_rpm) && (DC9_RESETS_DC_COUNTERS(data->devid) ?
+			(read_dc_counter(data->debugfs_fd, dc_target) < prev_dc) : true), msecs, 100);
 }
 
-static void check_dc9(data_t *data, int dc_target, int prev_dc)
+static void check_dc9(data_t *data, int dc_target, int prev_dc, int prev_rpm)
 {
-	igt_assert_f(dc9_wait_entry(data->debugfs_fd, dc_target, prev_dc, 3000),
+	igt_assert_f(dc9_wait_entry(data, dc_target, prev_dc, prev_rpm, 3000),
 			"DC9 state is not achieved\n%s:\n%s\n", RPM_STATUS,
 			data->debugfs_dump = igt_sysfs_get(data->debugfs_fd, RPM_STATUS));
 }
 
 static void setup_dc9_dpms(data_t *data, int dc_target)
 {
-	int prev_dc, sysfs_fd;
+	int prev_dc, prev_rpm, sysfs_fd;
 
 	igt_require((sysfs_fd = open(KMS_HELPER, O_RDONLY)) >= 0);
 	kms_poll_saved_state = igt_sysfs_get_boolean(sysfs_fd, "poll");
 	igt_sysfs_set_boolean(sysfs_fd, "poll", KMS_POLL_DISABLE);
 	close(sysfs_fd);
-	prev_dc = read_dc_counter(data->debugfs_fd, dc_target);
-	setup_dc_dpms(data);
-	dpms_off(data);
-	igt_skip_on_f(!(igt_wait(read_dc_counter(data->debugfs_fd, dc_target) >
+	if (DC9_RESETS_DC_COUNTERS(data->devid)) {
+		prev_dc = read_dc_counter(data->debugfs_fd, dc_target);
+		setup_dc_dpms(data);
+		dpms_off(data);
+		igt_skip_on_f(!(igt_wait(read_dc_counter(data->debugfs_fd, dc_target) >
 				prev_dc, 3000, 100)), "Unable to enters shallow DC states\n");
-	prev_dc = read_dc_counter(data->debugfs_fd, dc_target);
-	dpms_on(data);
-	cleanup_dc_dpms(data);
+		prev_dc = read_dc_counter(data->debugfs_fd, dc_target);
+		dpms_on(data);
+		cleanup_dc_dpms(data);
+	}
+	prev_rpm = read_runtime_suspended_time(data->drm_fd);
 	dpms_off(data);
 	sleep(1); /* wait for counters reset*/
-	check_dc9(data, dc_target, prev_dc);
+	check_dc9(data, dc_target, prev_dc, prev_rpm);
 	dpms_on(data);
 }
 
-- 
2.25.1