drm/amd/display: Enabling urgent latency adjustment for DCN35

[Why]

Underflow occurs when running netflix in a 4k144 eDP + 4k60 setup.
Increasing DCFCLK or urgent latency watermark fixes the issue. Implementing
this workaround for now while we figure out why this is happenning in DCN.

[How]

Enable urgent latency adjustment and match the reference to existing ASIC
that also see increased latency at low FCLK.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Nicholas Susanto <nicholas.susanto@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c
index 80bebfc268db0f59d2ac9067d3780f6675760afb..4d7bcda8ef72db7132529f8023920ddcf6b7af29 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c
@@ -195,9 +195,9 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_5_soc = {
        .dcn_downspread_percent = 0.5,
        .gpuvm_min_page_size_bytes = 4096,
        .hostvm_min_page_size_bytes = 4096,
-       .do_urgent_latency_adjustment = 0,
+       .do_urgent_latency_adjustment = 1,
        .urgent_latency_adjustment_fabric_clock_component_us = 0,
-       .urgent_latency_adjustment_fabric_clock_reference_mhz = 0,
+       .urgent_latency_adjustment_fabric_clock_reference_mhz = 3000,
 };
 
 void dcn35_build_wm_range_table_fpu(struct clk_mgr *clk_mgr)