During encoder enabling we clear the flag before starting the ACT
sequence and wait for the flag, but the clearing is missing during
encoder disabling, add it there too. Since nothing cleared the flag
automatically we could've run subsequent disabling steps too early.

Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c 
b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index b66b56a070e5..9308b5920780 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -389,6 +389,8 @@ static void intel_mst_post_disable_dp(struct 
intel_atomic_state *state,
 
        drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 
+       clear_act_sent(intel_dp);
+
        val = intel_de_read(dev_priv,
                            TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder));
        val &= ~TRANS_DDI_DP_VC_PAYLOAD_ALLOC;
-- 
2.23.1

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