From: Austin Zheng <Austin.Zheng@xxxxxxx> [Why/How] vBlank used to determine the max vStartup is based on the smallest between the vblank provided by the timing and vblank in ip_caps. Extra vblank time is not considered if the vblank provided by the timing ends up being higher than what's defined by the ip_caps Use 1 less than the vblank size in case the timing is interlaced so vstartup will always be less than vblank_nom. Reviewed-by: Dillon Varone <dillon.varone@xxxxxxx> Signed-off-by: Austin Zheng <Austin.Zheng@xxxxxxx> Signed-off-by: Wayne Lin <wayne.lin@xxxxxxx> --- .../dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c index c4dbf27abaf8..b1da89a5e5e4 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c @@ -3709,13 +3709,12 @@ static unsigned int CalculateMaxVStartup( double line_time_us = (double)timing->h_total / ((double)timing->pixel_clock_khz / 1000); unsigned int vblank_actual = timing->v_total - timing->v_active; unsigned int vblank_nom_default_in_line = (unsigned int)math_floor2((double)vblank_nom_default_us / line_time_us, 1.0); - unsigned int vblank_nom_input = (unsigned int)math_min2(timing->vblank_nom, vblank_nom_default_in_line); - unsigned int vblank_avail = (vblank_nom_input == 0) ? vblank_nom_default_in_line : vblank_nom_input; + unsigned int vblank_avail = (timing->vblank_nom == 0) ? vblank_nom_default_in_line : (unsigned int)timing->vblank_nom; vblank_size = (unsigned int)math_min2(vblank_actual, vblank_avail); if (timing->interlaced && !ptoi_supported) - max_vstartup_lines = (unsigned int)(math_floor2(vblank_size / 2.0, 1.0)); + max_vstartup_lines = (unsigned int)(math_floor2((vblank_size - 1) / 2.0, 1.0)); else max_vstartup_lines = vblank_size - (unsigned int)math_max2(1.0, math_ceil2(write_back_delay_us / line_time_us, 1.0)); #ifdef __DML_VBA_DEBUG__ -- 2.37.3
