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drm/amd/display: Check for Zero Range in FreeSync Calc 

-check for min/max range in freesync calculation and handle it accordingly

Signed-off-by: Eric <eric.cook@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Cook 2017-04-26 11:51:38 -04:00 committed by Alex Deucher
parent 1c29313b96
commit 7cc9e7a68a
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
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@ -363,6 +363,21 @@ static void calc_freesync_range(struct core_freesync *core_freesync,
unsigned int index = map_index_from_stream(core_freesync, stream);
uint32_t vtotal = stream->timing.v_total;
if ((min_refresh_in_uhz == 0) || (max_refresh_in_uhz == 0)) {
state->freesync_range.min_refresh =
state->nominal_refresh_rate_in_micro_hz;
state->freesync_range.max_refresh =
state->nominal_refresh_rate_in_micro_hz;
state->freesync_range.max_frame_duration = 0;
state->freesync_range.min_frame_duration = 0;
state->freesync_range.vmax = vtotal;
state->freesync_range.vmin = vtotal;
return;
}
min_frame_duration_in_ns = ((unsigned int) (div64_u64(
(1000000000ULL * 1000000),
max_refresh_in_uhz)));