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drm/amd/display: skip enable stream on disconnected display

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[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 <Wenjing.Liu@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wenjing Liu 2019-09-03 17:15:48 -04:00 committed by Alex Deucher
parent 1cb1d47741
commit ef5a7d266e
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@ -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