From ef5a7d266e828e45b88cbbc36f69b2d12464375c Mon Sep 17 00:00:00 2001 From: Wenjing Liu Date: Tue, 3 Sep 2019 17:15:48 -0400 Subject: [PATCH] drm/amd/display: skip enable stream on disconnected display [why] Virtual signal means there is no display attached. In this case we will assign a virtual signal type to the stream. We should only enable the front end of the stream but not the back end. [how] When stream is enabling with virtual signal type, skip backend programming. Signed-off-by: Wenjing Liu Reviewed-by: Jun Lei Acked-by: Bhawanpreet Lakha Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 152c564a8344..c2688efe1f81 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -2718,6 +2718,10 @@ void core_link_enable_stream( enum dc_status status; DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger); + if (!IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment) && + dc_is_virtual_signal(pipe_ctx->stream->signal)) + return; + if (!dc_is_virtual_signal(pipe_ctx->stream->signal)) { stream->link->link_enc->funcs->setup( stream->link->link_enc, @@ -2860,6 +2864,10 @@ void core_link_disable_stream(struct pipe_ctx *pipe_ctx) struct dc_stream_state *stream = pipe_ctx->stream; struct dc_link *link = stream->sink->link; + if (!IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment) && + dc_is_virtual_signal(pipe_ctx->stream->signal)) + return; + #if defined(CONFIG_DRM_AMD_DC_HDCP) update_psp_stream_config(pipe_ctx, true); #endif -- 2.30.2