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drm/amd/display: To apply the adjusted DP ref clock for DP devices

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[Why]
For some pixel clock margin sensitive external monitor,
we could not keep original DP ref clock for the ASICs
supported SSC DP ref clock.

[How]
From slicon design team's comment,
we have to apply the adjusted DP ref clock for
DP devices.
DP 128b (DP2) signals uses the DTBCLK not DP ref.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Yiling Chen <yi-ling.chen2@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>
This commit is contained in:
Yiling Chen 2025-03-04 16:52:16 +08:00 committed by Alex Deucher
parent eec6444923
commit f53d0f48a8
1 changed files with 5 additions and 4 deletions
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9
drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
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@ -976,11 +976,12 @@ static bool dcn31_program_pix_clk(
struct bp_pixel_clock_parameters bp_pc_params = {0};
enum transmitter_color_depth bp_pc_colour_depth = TRANSMITTER_COLOR_DEPTH_24;
// Apply ssed(spread spectrum) dpref clock for edp only.
if (clock_source->ctx->dc->clk_mgr->dp_dto_source_clock_in_khz != 0
&& pix_clk_params->signal_type == SIGNAL_TYPE_EDP
&& encoding == DP_8b_10b_ENCODING)
// Apply ssed(spread spectrum) dpref clock for edp and dp
if (clock_source->ctx->dc->clk_mgr->dp_dto_source_clock_in_khz != 0 &&
dc_is_dp_signal(pix_clk_params->signal_type) &&
encoding == DP_8b_10b_ENCODING)
dp_dto_ref_khz = clock_source->ctx->dc->clk_mgr->dp_dto_source_clock_in_khz;
// For these signal types Driver to program DP_DTO without calling VBIOS Command table
if (dc_is_dp_signal(pix_clk_params->signal_type) || dc_is_virtual_signal(pix_clk_params->signal_type)) {
if (e) {