The current DP MST hotplug handling sequence adds new remote
sinks during the MST plug-in, but it doesn't removes it during
the unplug, which results into saturation of sink count after
2 contineous hotplugs (dual monitor scenario).
This patch adds a clean-up sequence during the hot-unplug situation.
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
---
.../display/amdgpu_dm/amdgpu_dm_mst_types.c | 30 ++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 8dc5005bec0a..8b87dd0a3d50 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -220,6 +220,7 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
struct dc_sink_init_data init_params = {
.link = aconnector->dc_link,
.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
+
dc_sink = dc_link_add_remote_sink(
aconnector->dc_link,
(uint8_t *)aconnector->edid,
@@ -266,15 +267,42 @@ dm_mst_atomic_best_encoder(struct drm_connector *connector,
return &adev->dm.mst_encoders[acrtc->crtc_id].base;
}
+static void
+dm_dp_mst_sink_cleanup(struct drm_connector *connector)
+{
+ struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+
+ if (aconnector->dc_sink)
+ dc_link_remove_remote_sink(aconnector->dc_link,
+ aconnector->dc_sink);
+
+ if (aconnector->edid) {
+ kfree(aconnector->edid);
+ aconnector->edid = NULL;
+ }
+}
+
static int
dm_dp_mst_detect(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx, bool force)
{
struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
struct amdgpu_dm_connector *master = aconnector->mst_port;
+ enum drm_connector_status status;
- return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
+ status = drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
aconnector->port);
+
+ if ((status == connector_status_disconnected) &&
+ (connector->status == connector_status_connected)) {
+
+ /* Fresh hot-unplug scenario, sink cleaup required */
+ DRM_DEBUG_DRIVER("[CONNECTOR:%d:%s] MST hot-unplug, doing sink cleanup\n",
+ connector->base.id, connector->name);
+ dm_dp_mst_sink_cleanup(connector);
+ }
+
+ return status;
}
static int dm_dp_mst_atomic_check(struct drm_connector *connector,
--
2.25.1
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