From: Austin Zheng <[email protected]>
[Why/How]
Row bandwidth contribution to lb_flip_bw was refactored to only consider
bandwidth needed for a single row.
row_time_budget is for 2 row's worth of time but only half is needed when
calculating the row bandwidth used in the lb_flip_bw calculation.
Also add meta row bytes that was accidentally removed during previous
refactor.
Reviewed-by: Dillon Varone <[email protected]>
Signed-off-by: Austin Zheng <[email protected]>
Signed-off-by: Ivan Lipski <[email protected]>
---
.../dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
index 5a1b710b9ec8f..9a205b0e15989 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
@@ -6654,7 +6654,7 @@ static void CalculateFlipSchedule(
l->lb_flip_bw = math_max3(
l->hvm_scaled_vm_row_bytes / l->vm_and_row_time_budget,
l->hvm_scaled_vm_bytes / math_min2(l->vm_time_budget, 31.75 * LineTime - Tno_bw_flip),
- l->dpte_row_bytes * HostVMInefficiencyFactor / math_min2(l->row_time_budget, 15.75 * LineTime));
+ (l->dpte_row_bytes * HostVMInefficiencyFactor + meta_row_bytes) / math_min2(l->row_time_budget / 2, 15.75 * LineTime)); //use bandwidth for a single row
#ifdef __DML_VBA_DEBUG__
DML_LOG_VERBOSE("DML::%s: max_flip_time = %f\n", __func__, l->max_flip_time);
DML_LOG_VERBOSE("DML::%s: total vm bytes (hvm ineff scaled) = %f\n", __func__, l->hvm_scaled_vm_bytes);
@@ -6681,7 +6681,7 @@ static void CalculateFlipSchedule(
Tno_bw_flip + vm_bytes * HostVMInefficiencyFactor / l->lb_flip_bw,
LineTime / 4.0);
l->Tr0_flip = math_max3(Tr0_trips_flip,
- l->dpte_row_bytes * HostVMInefficiencyFactor / l->lb_flip_bw,
+ (l->dpte_row_bytes * HostVMInefficiencyFactor + meta_row_bytes) / l->lb_flip_bw,
LineTime / 4.0);
*dst_y_per_vm_flip = math_ceil2(4.0 * l->Tvm_flip / LineTime, 1.0) / 4.0;
--
2.43.0
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