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drm/amd/display: incorrect conditions for failing dto calculations

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[Why & How]
Previously, when calculating dto phase, we would incorrectly fail when phase
<=0 without additionally checking for the integer value. This meant that
calculations would incorrectly fail when the desired pixel clock was an exact
multiple of the reference clock.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Clay King <clayking@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Clay King 2025-08-20 15:04:29 -04:00 committed by Alex Deucher
parent cf49a454e1
commit 306cbcc6f6
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/dc/dccg/dcn401/dcn401_dccg.c
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@ -619,7 +619,7 @@ void dccg401_set_dp_dto(
dto_integer = div_u64(params->pixclk_hz, dto_modulo_hz);
dto_phase_hz = params->pixclk_hz - dto_integer * dto_modulo_hz;
if (dto_phase_hz <= 0) {
if (dto_phase_hz <= 0 && dto_integer <= 0) {
/* negative pixel rate should never happen */
BREAK_TO_DEBUGGER();
return;