[PATCH v3 15/21] drm/i915/dp_mst: Reset intel_dp->link_trained during disabling

[Imre Deak <imre.deak@intel.com>]

Reset the flag indicating an active link after disabling an MST link,
similarly to how this is done for SST outputs. This avoids trying to
retrain an MST link while its disabled.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 9362eb958310f..c3514abed5a2d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -981,6 +981,9 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
 	drm_dbg_kms(&i915->drm, "active links %d\n",
 		    intel_dp->active_mst_links);
 
+	if (intel_dp->active_mst_links == 1)
+		intel_dp->link_trained = false;
+
 	intel_hdcp_disable(intel_mst->connector);
 
 	intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
-- 
2.43.3