diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-11-20 15:09:56 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-11-24 14:12:36 +0000 |
| commit | 08b13995b85df26a77212e4fb21fd772976ef33c (patch) | |
| tree | a3c39c2e6999aae70d02b17e4778d4b06e0c2442 /tests/kms_setmode.c | |
| parent | 50361845e873bb2c7820d3eace1add980c420067 (diff) | |
tests/kms_setmode: Ignore small deviations between vblank and mode
Since we only expect our vblank timings to be accurate to within a
scanline, ignore any deviation between the measured interval and the
expected interval derived from the modeline if it is less than a single
scanline.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: "Ram Moon, AnandX" <anandx.ram.moon@intel.com>
Tested-by: "Ram Moon, AnandX" <anandx.ram.moon@intel.com>
Diffstat (limited to 'tests/kms_setmode.c')
| -rw-r--r-- | tests/kms_setmode.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/tests/kms_setmode.c b/tests/kms_setmode.c index a01010a1..878e149a 100644 --- a/tests/kms_setmode.c +++ b/tests/kms_setmode.c @@ -525,10 +525,12 @@ static void check_timings(int crtc_idx, const drmModeModeInfo *kmode) * See: * https://en.wikipedia.org/wiki/Standard_deviation#Rules_for_normally_distributed_data */ - igt_assert_f(fabs(mean - expected) < 1.718 * stddev, - "vblank interval differs from modeline! expected %.1fus, measured %1.fus +- %.3fus, difference %.1fus (%.1f sigma)\n", + igt_assert_f(fabs(mean - expected) < max(line_time(kmode), 1.718 * stddev), + "vblank interval differs from modeline! expected %.1fus, measured %1.fus +- %.3fus, difference %.1fus (%.1f sigma, %.1f scanlines)\n", expected, mean, stddev, - fabs(mean - expected), fabs(mean - expected) / stddev); + fabs(mean - expected), + fabs(mean - expected) / stddev, + fabs(mean - expected) / line_time(kmode)); } static void test_crtc_config(const struct test_config *tconf, |