When all screens are disabled, it takes some time to release
eDP/DP AUX IO power domain ref count. Also, delayed audio codec
disabling takes time to release AUDIO power domain ref-count,
using igt_wait to check lpsp after disabling all screens.

Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
---
 tests/i915/i915_pm_lpsp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/i915/i915_pm_lpsp.c b/tests/i915/i915_pm_lpsp.c
index 7be23e6c..e05d3791 100644
--- a/tests/i915/i915_pm_lpsp.c
+++ b/tests/i915/i915_pm_lpsp.c
@@ -79,7 +79,8 @@ static void screens_disabled_subtest(data_t *data)
 	}
 
 	igt_require_f(valid_output, "No connected output found\n");
-	igt_assert_f(lpsp_is_enabled(data), "lpsp is not enabled\n%s:\n%s\n",
+	igt_assert_f(igt_wait(lpsp_is_enabled(data), 1000, 100),

Better to add code-comment here how the above time is calculated. Is it based on observation or captured anywhere? 

Regards,
Animesh

+		     "lpsp is not enabled\n%s:\n%s\n",
 		     PWR_DOMAIN_INFO, data->pwr_dmn_info =
 		     igt_sysfs_get(data->debugfs_fd, PWR_DOMAIN_INFO));
 }