From: Lo-an Chen lo-an.chen@amd.com
[WHY] The minimum value of the dst_y_prefetch_equ was not correct in prefetch calculation whice causes OPTC underflow.
[HOW] Add the min operation of dst_y_prefetch_equ in prefetch calculation.
Cc: Mario Limonciello mario.limonciello@amd.com Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Reviewed-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Lo-an Chen lo-an.chen@amd.com Signed-off-by: Alex Hung alex.hung@amd.com --- drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c b/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c index d851c081e376..8dabb1ac0b68 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c @@ -1222,6 +1222,7 @@ static dml_bool_t CalculatePrefetchSchedule(struct display_mode_lib_scratch_st * s->dst_y_prefetch_oto = s->Tvm_oto_lines + 2 * s->Tr0_oto_lines + s->Lsw_oto;
s->dst_y_prefetch_equ = p->VStartup - (*p->TSetup + dml_max(p->TWait + p->TCalc, *p->Tdmdl)) / s->LineTime - (*p->DSTYAfterScaler + (dml_float_t) *p->DSTXAfterScaler / (dml_float_t)p->myPipe->HTotal); + s->dst_y_prefetch_equ = dml_min(s->dst_y_prefetch_equ, 63.75); // limit to the reg limit of U6.2 for DST_Y_PREFETCH
#ifdef __DML_VBA_DEBUG__ dml_print("DML::%s: HTotal = %u\n", __func__, p->myPipe->HTotal);