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drm/amd/display: Properly round nominal frequency for SPD

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[ Upstream commit c59802313e ]

[Why]
Some displays rely on the SPD verticle frequency maximum value.
Must round the calculated refresh rate to the nearest integer.

[How]
Round the nominal calculated refresh rate to the nearest whole
integer.

Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aric Cyr
2019-09-11 16:17:08 -04:00
committed by Greg Kroah-Hartman
parent 4754e8234e
commit 2dc436de7a
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
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@@ -743,6 +743,10 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
nominal_field_rate_in_uhz =
mod_freesync_calc_nominal_field_rate(stream);
/* Rounded to the nearest Hz */
nominal_field_rate_in_uhz = 1000000ULL *
div_u64(nominal_field_rate_in_uhz + 500000, 1000000);
min_refresh_in_uhz = in_config->min_refresh_in_uhz;
max_refresh_in_uhz = in_config->max_refresh_in_uhz;
@@ -996,14 +1000,13 @@ unsigned long long mod_freesync_calc_nominal_field_rate(
const struct dc_stream_state *stream)
{
unsigned long long nominal_field_rate_in_uhz = 0;
unsigned int total = stream->timing.h_total * stream->timing.v_total;
/* Calculate nominal field rate for stream */
/* Calculate nominal field rate for stream, rounded up to nearest integer */
nominal_field_rate_in_uhz = stream->timing.pix_clk_100hz / 10;
nominal_field_rate_in_uhz *= 1000ULL * 1000ULL * 1000ULL;
nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz,
stream->timing.h_total);
nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz,
stream->timing.v_total);
nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz, total);
return nominal_field_rate_in_uhz;
}