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

[Srinivas, Vidya]

Tested-by: Vidya Srinivas <vidya.srinivas at intel.com>

> -----Original Message-----
> From: igt-dev <igt-dev-bounces at lists.freedesktop.org> On Behalf Of
> Bhanuprakash Modem
> Sent: Wednesday, December 13, 2023 3:24 PM
> To: igt-dev at lists.freedesktop.org
> Subject: [i-g-t 1/2] tests/kms_vrr: Tweak flipline subtest
> 
> 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 at intel.com>
> ---
>  tests/kms_vrr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/kms_vrr.c b/tests/kms_vrr.c index 1ace970a5..71fc36162
> 100644
> --- a/tests/kms_vrr.c
> +++ b/tests/kms_vrr.c
> @@ -481,11 +481,11 @@ 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",
> -			     (range.min - 5), rate, result);
> +			     (range.min - 10), rate, result);
>  	}
> 
>  	/*
> --
> 2.40.0