From: yi-lchen <[email protected]> [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 <[email protected]> Signed-off-by: Yi-Ling Chen <[email protected]> Signed-off-by: Zaeem Mohamed <[email protected]> --- drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c index 077337698e0a..b4f5b4a6331a 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c @@ -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) { -- 2.34.1
