From: Michael Strauss michael.strauss@amd.com
[ Upstream commit 5a82b8d6c05f9b30828ede1b103b9ee5cb5c912e ]
[WHY] Previous fix for multiple displays downstream of DP2 MST hub caused regression
[HOW] Match sink IDs instead of sink struct addresses
Reviewed-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Reviewed-by: Charlene Liu charlene.liu@amd.com Acked-by: Wayne Lin wayne.lin@amd.com Signed-off-by: Michael Strauss michael.strauss@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c | 8 ++++++++ 1 file changed, 8 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 2498b8341199..d6a68484153c 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 +157,14 @@ 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]->sink_id == pipe_ctx->stream->sink->sink_id)); + } + 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));