Commit db31af12 authored by Jun Lei's avatar Jun Lei Committed by Alex Deucher

drm/amd/display: cap DCFCLK hardmin to 507 for NV10

[why]
Due to limitation in SMU/PPLIB, it is not possible to know Fmax @ Vmin for DCFCLK.
This causes issues at high display configurations where extra headroom of DCFCLK
can enable P-state switching

[how]
Use existing override logic.  If override not defined, then force
min = 507
Signed-off-by: default avatarJun Lei <Jun.Lei@amd.com>
Reviewed-by: default avatarEric Yang <eric.yang2@amd.com>
Acked-by: default avatarLeo Li <sunpeng.li@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 5d109be3
......@@ -2643,6 +2643,10 @@ static void update_bounding_box(struct dc *dc, struct _vcs_dpi_soc_bounding_box_
if (dc->bb_overrides.min_dcfclk_mhz > 0)
min_dcfclk = dc->bb_overrides.min_dcfclk_mhz;
else
// Accounting for SOC/DCF relationship, we can go as high as
// 506Mhz in Vmin. We need to code 507 since SMU will round down to 506.
min_dcfclk = 507;
for (i = 0; i < num_states; i++) {
int min_fclk_required_by_uclk;
......
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