diff options
| author | Dorota Czaplejewicz <dorota.czaplejewicz@collabora.co.uk> | 2016-11-30 17:06:32 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-12-06 12:34:45 +0000 |
| commit | 32eed6906ed17e79bf39e4b956400d1b68dd274a (patch) | |
| tree | 4ba6c1a363db5bb7fc482fa5471b02d0d346b0de | |
| parent | 66ce6285500b4e2fb0031270f7680e6d32ff750c (diff) | |
igt/kms_flip.c: Fix timings check
Adjust the description and constants in the timing check to match each other.
Relax the timing constraint to prevent false positives in vblank interval checking.
| -rw-r--r-- | tests/kms_flip.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/tests/kms_flip.c b/tests/kms_flip.c index f744b3d2..76b1cc2b 100644 --- a/tests/kms_flip.c +++ b/tests/kms_flip.c @@ -1206,9 +1206,12 @@ static void calibrate_ts(struct test_output *o, int crtc_idx) stddev = igt_stats_get_std_deviation(&stats); igt_info("Expected frametime: %.0fus; measured %.1fus +- %.3fus accuracy %.2f%%\n", - expected, mean, stddev, 100 * 6 * stddev / mean); - igt_assert(6 * stddev / mean < 0.005); /* 99% accuracy within 0.5% */ - + expected, mean, stddev, 100 * 3 * stddev / mean); + /* 99.7% samples within 0.5% of the mean */ + igt_assert(3 * stddev / mean < 0.005); + /* 84% samples within 0.5% of the expected value. + * See comments in check_timings() in kms_setmode.c + */ if (fabs(mean - expected) > 2*stddev) { igt_warn("vblank interval differs from modeline! expected %.1fus, measured %1.fus +- %.3fus, difference %.1fus (%.1f sigma)\n", expected, mean, stddev, |