From fa745b554733ff0ed9ff918a0a53267300444c88 Mon Sep 17 00:00:00 2001 From: Michael Strauss Date: Fri, 1 Dec 2023 06:25:00 -0700 Subject: [PATCH] drm/amd/display: Only enumerate top local sink as DP2 output [WHY] Many DCN generations only have two HPO link encoders and therefore only support driving a max of two DP2 PHYs. DP2 MST hubs currently can not pass 3x display validation as each downstream sink is enumerated as separate DP2 output. [HOW] Count MST hubs once by treating only 1st remote sink in topology as an encoder. Tested-by: Daniel Wheeler Reviewed-by: Nicholas Kazlauskas Acked-by: Rodrigo Siqueira Signed-off-by: Michael Strauss Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c b/drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c index 33eab80e89a84..6ba393e5b8ee7 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c @@ -157,6 +157,15 @@ bool is_dp2p0_output_encoder(const struct pipe_ctx *pipe_ctx) { /* If this assert is hit then we have a link encoder dynamic management issue */ ASSERT(pipe_ctx->stream_res.hpo_dp_stream_enc ? pipe_ctx->link_res.hpo_dp_link_enc != NULL : true); + + /* Count MST hubs once by treating only 1st remote sink in topology as an encoder */ + if (pipe_ctx->stream->link && pipe_ctx->stream->link->remote_sinks[0]) { + return (pipe_ctx->stream_res.hpo_dp_stream_enc && + pipe_ctx->link_res.hpo_dp_link_enc && + dc_is_dp_signal(pipe_ctx->stream->signal) && + (pipe_ctx->stream->link->remote_sinks[0] == pipe_ctx->stream->sink)); + } + return (pipe_ctx->stream_res.hpo_dp_stream_enc && pipe_ctx->link_res.hpo_dp_link_enc && dc_is_dp_signal(pipe_ctx->stream->signal)); -- 2.30.2