drm/i915/mst: use reference counted connectors. (v3)

Don't just free the connector when we get the destroy callback.

Drop a reference to it, and set it's mst_port to NULL so
no more mst work is done on it.

v2: core mst accepts NULLs fine. Cleanup EDID code properly.
v3: drop the extra reference we were taking.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 20 insertions, 23 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 94b4e833dadd..b6bf7fd0b806 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -109,7 +109,7 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder)
 
         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 
-        drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
+        drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->connector->port);
 
         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
         if (ret) {
@@ -134,10 +134,11 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
         /* and this can also fail */
         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 
-        drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
+        drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->connector->port);
 
         intel_dp->active_mst_links--;
-        intel_mst->port = NULL;
+
+        intel_mst->connector = NULL;
         if (intel_dp->active_mst_links == 0) {
                 intel_dig_port->base.post_disable(&intel_dig_port->base);
                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
@@ -177,7 +178,8 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
         found->encoder = encoder;
 
         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
-        intel_mst->port = found->port;
+
+        intel_mst->connector = found;
 
         if (intel_dp->active_mst_links == 0) {
                 intel_prepare_ddi_buffer(&intel_dig_port->base);
@@ -195,7 +197,7 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
         }
 
         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
-                                       intel_mst->port,
+                                       intel_mst->connector->port,
                                        intel_crtc->config->pbn, &slots);
         if (ret == false) {
                 DRM_ERROR("failed to allocate vcpi\n");
@@ -244,7 +246,7 @@ static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
 {
         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
         *pipe = intel_mst->pipe;
-        if (intel_mst->port)
+        if (intel_mst->connector)
                 return true;
         return false;
 }
@@ -308,10 +310,11 @@ static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
         struct edid *edid;
         int ret;
 
-        edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
-        if (!edid)
-                return 0;
+        if (!intel_dp) {
+                return intel_connector_update_modes(connector, NULL);
+        }
 
+        edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
         ret = intel_connector_update_modes(connector, edid);
         kfree(edid);
 
@@ -324,6 +327,8 @@ intel_dp_mst_detect(struct drm_connector *connector, bool force)
         struct intel_connector *intel_connector = to_intel_connector(connector);
         struct intel_dp *intel_dp = intel_connector->mst_port;
 
+        if (!intel_dp)
+                return connector_status_disconnected;
         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
 }
 
@@ -389,6 +394,8 @@ static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *c
         struct intel_dp *intel_dp = intel_connector->mst_port;
         struct intel_crtc *crtc = to_intel_crtc(state->crtc);
 
+        if (!intel_dp)
+                return NULL;
         return &intel_dp->mst_encoders[crtc->pipe]->base.base;
 }
 
@@ -396,6 +403,8 @@ static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connecto
 {
         struct intel_connector *intel_connector = to_intel_connector(connector);
         struct intel_dp *intel_dp = intel_connector->mst_port;
+        if (!intel_dp)
+                return NULL;
         return &intel_dp->mst_encoders[0]->base.base;
 }
 
@@ -506,23 +515,11 @@ static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 
         /* need to nuke the connector */
         drm_modeset_lock_all(dev);
-        if (connector->state->crtc) {
-                struct drm_mode_set set;
-                int ret;
-
-                memset(&set, 0, sizeof(set));
-                set.crtc = connector->state->crtc,
-
-                ret = drm_atomic_helper_set_config(&set);
-
-                WARN(ret, "Disabling mst crtc failed with %i\n", ret);
-        }
-
         intel_connector_remove_from_fbdev(intel_connector);
-        drm_connector_cleanup(connector);
+        intel_connector->mst_port = NULL;
         drm_modeset_unlock_all(dev);
 
-        kfree(intel_connector);
+        drm_connector_unreference(&intel_connector->base);
         DRM_DEBUG_KMS("\n");
 }