linux-kernel - [PATCH] drm/amdgpu/dm: Remove unneeded hotplug event in s3_handle

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Date:   Wed, 17 Jul 2019 21:48:56 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     amd-gfx@...ts.freedesktop.org
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        David Francis <David.Francis@....com>,
        Mario Kleiner <mario.kleiner.de@...il.com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        Anthony Koo <Anthony.Koo@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu/dm: Remove unneeded hotplug event in s3_handle_mst()

The DRM DP MST topology manager will send it's own hotplug events when
connectors are destroyed, so there's no reason to send an additional
hotplug event here.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 0242d693f4f6..156eeacee2ae 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -812,7 +812,6 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend)
 	struct drm_connector *connector;
 	struct drm_dp_mst_topology_mgr *mgr;
 	int ret;
-	bool need_hotplug = false;
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 
@@ -831,15 +830,15 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend)
 			ret = drm_dp_mst_topology_mgr_resume(mgr);
 			if (ret < 0) {
 				drm_dp_mst_topology_mgr_set_mst(mgr, false);
-				need_hotplug = true;
+				mutex_lock(&aconnector->hpd_lock);
+				aconnector->dc_link->type =
+					dc_connection_single;
+				mutex_unlock(&aconnector->hpd_lock);
 			}
 		}
 	}
 
 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
-
-	if (need_hotplug)
-		drm_kms_helper_hotplug_event(dev);
 }
 
 /**
-- 
2.21.0