[i-g-t 1/2] tests/kms_vrr: Tweak flipline subtest

[Bhanuprakash Modem <bhanuprakash.modem@intel.com>]

As per the spec: If there is no flip request with in Vmax,
Hardware will terminate the Vblank at Vmax.

If we flip with the interval > Vmax, the expected refresh rate
could be: (Vmax + time left for the next flip + Vmin), and it
is very difficult to generalize. For low refresh rate panels
(like 40 - 60 Hz), result is not falling into the threshold.

Hence, tweak the test to increase the flip request interval.

Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
---
 tests/kms_vrr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/kms_vrr.c b/tests/kms_vrr.c
index 5c190cd8c..7cb7c3ef5 100644
--- a/tests/kms_vrr.c
+++ b/tests/kms_vrr.c
@@ -456,7 +456,7 @@ test_basic(data_t *data, enum pipe pipe, igt_output_t *output, uint32_t flags)
 	}
 
 	if (flags & TEST_FLIPLINE) {
-		rate = rate_from_refresh(range.min - 5);
+		rate = rate_from_refresh(range.min - 10);
 		result = flip_and_measure(data, output, pipe, rate, TEST_DURATION_NS);
 		igt_assert_f(result < 50,
 			     "Refresh rate (%u Hz) %"PRIu64"ns: Target VRR on threshold exceeded, result was %u%%\n",
-- 
2.40.0