drm/amd/display: Enable urgent latency adjustment on DCN35

[ Upstream commit 756c85e4d0ddc497b4ad5b1f41ad54e838e06188 ]

[Why]

Urgent latency adjustment was disabled on DCN35 due to issues with P0
enablement on some platforms. Without urgent latency, underflows occur
when doing certain high timing configurations. After testing, we found
that reenabling urgent latency didn't reintroduce p0 support on multiple
platforms.

[How]

renable urgent latency on DCN35 and setting it to 3000 Mhz.

This reverts commit 3412860cc4c0c484f53f91b371483e6e4440c3e5.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Nicholas Susanto <nsusanto@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Mark Broadworth <mark.broadworth@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit cd74ce1f0cddffb3f36d0995d0f61e89f0010738)
Signed-off-by: Sasha Levin <sashal@kernel.org>

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 47d785204f29cb5a23dd3e74e8c8a7fcab3759ab..beed7adbbd43e012386be00defd176f3ee32b1f9 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)