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drm/amd/display: add DP2.0 debug option to set MST_EN for SST stream 

[why]
Some DP2.0 RX requires us to set MST_EN even for SST configuration.
We added this debug option so we can configure this temporary workaround
for the RX.

Reviewed-by: George Shen <george.shen@amd.com>
Acked-by: Agustin Gutierrez Sanchez <agustin.gutierrez@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wenjing Liu 2021-09-24 16:12:34 -04:00 committed by Alex Deucher
parent d5ce4313cc
commit 05692bb02a
2 changed files with 7 additions and 1 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -1869,8 +1869,13 @@ static enum dc_status enable_link_dp(struct dc_state *state,
do_fallback = true;
#if defined(CONFIG_DRM_AMD_DC_DCN)
/*
* Temporary w/a to get DP2.0 link rates to work with SST.
* TODO DP2.0 - Workaround: Remove w/a if and when the issue is resolved.
*/
if (dp_get_link_encoding_format(&link_settings) == DP_128b_132b_ENCODING &&
pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT) {
pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT &&
link->dc->debug.set_mst_en_for_sst) {
dp_enable_mst_on_sink(link, true);
}
#endif

1
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -664,6 +664,7 @@ struct dc_debug_options {
#if defined(CONFIG_DRM_AMD_DC_DCN)
/* TODO - remove once tested */
bool legacy_dp2_lt;
bool set_mst_en_for_sst;
#endif
union mem_low_power_enable_options enable_mem_low_power;
union root_clock_optimization_options root_clock_optimization;