If the sink supports 128b/132b and single-stream sideband messaging,
enable MST mode.
With this, the topology manager will still write DP_MSTM_CTRL, which
should be ignored by the sink. In the future,
drm_dp_mst_topology_mgr_set_mst() bool mst_state parameter should
probably be turned into an enum drm_dp_mst_mode mst_mode parameter.
Cc: Arun R Murthy <arun.r.mur...@intel.com>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
b/drivers/gpu/drm/i915/display/intel_dp.c
index 4dd9c50226d1..16130e87dc23 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -4020,7 +4020,9 @@ static bool intel_dp_mst_detect(struct intel_dp *intel_dp)
intel_dp->is_mst = i915->display.params.enable_dp_mst &&
intel_dp_mst_source_support(intel_dp) &&
- sink_mst_mode == DP_MST_CAPABLE;
+ (sink_mst_mode == DP_MST_CAPABLE ||
+ (sink_mst_mode == DP_MST_SIDEBAND_MSG &&
+ intel_dp->dpcd[DP_MAIN_LINK_CHANNEL_CODING] &
DP_CAP_ANSI_128B132B));
drm_dbg_kms(&i915->drm,
"[ENCODER:%d:%s] MST support: port: %s, sink: %s, modparam:
%s -> enable: %s\n",
--
2.39.2
