[Intel-gfx] [PATCH] drm/i915/dp/mst: Fix MST logic in intel_dp_long_pulse()

[Jim Bride]

In commit 7d23e3c3 ("drm/i915: Cleaning up intel_dp_hpd_pulse") some
much needed clean-up was done, but unfortunately part of the change
broke DP MST.  The real issue was setting the connector state to
disconnected in the MST case, which is good, but the code then (after
a goto) checks if the connector state is not connected and shuts down
MST if this is the case, which is bad.  With this change both SST and
MST seem to be happy.

cc: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>
cc: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
cc: Ander Conselvan de Oliveira <conselvan2 at gmail.com>
cc: Nathan D Ciobanu <nathan.d.ciobanu at intel.com>
Signed-off-by: Jim Bride <jim.bride at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index da0c3d2..2d8783e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4665,20 +4665,9 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
 	}
 
 out:
-	if (status != connector_status_connected) {
+	if ((status != connector_status_connected) &&
+	    (intel_dp->is_mst == false))
 		intel_dp_unset_edid(intel_dp);
-		/*
-		 * If we were in MST mode, and device is not there,
-		 * get out of MST mode
-		 */
-		if (intel_dp->is_mst) {
-			DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n",
-				      intel_dp->is_mst, intel_dp->mst_mgr.mst_state);
-			intel_dp->is_mst = false;
-			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr,
-							intel_dp->is_mst);
-		}
-	}
 
 	intel_display_power_put(to_i915(dev), power_domain);
 	return;
-- 
2.5.0