diff options
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 182 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv50/disp.c | 6 | ||||
| -rw-r--r-- | include/drm/drm_dp_mst_helper.h | 3 |
5 files changed, 156 insertions, 40 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 8f67d301ad81..6c34f640f419 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -974,7 +974,7 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) if (suspend) { drm_dp_mst_topology_mgr_suspend(mgr); } else { - ret = drm_dp_mst_topology_mgr_resume(mgr); + ret = drm_dp_mst_topology_mgr_resume(mgr, true); if (ret < 0) { drm_dp_mst_topology_mgr_set_mst(mgr, false); need_hotplug = true; diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 588b67cea052..42eac2a59a4b 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -67,8 +67,8 @@ static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int offset, int size, u8 *bytes); -static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_branch *mstb); +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb); static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *port); @@ -1977,7 +1977,7 @@ drm_dp_mst_add_port(struct drm_device *dev, return port; } -static void +static int drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, struct drm_device *dev, struct drm_dp_link_addr_reply_port *port_msg) @@ -1986,33 +1986,45 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *port; int old_ddps = 0, ret; u8 new_pdt = DP_PEER_DEVICE_NONE; - bool created = false, send_link_addr = false; + bool created = false, send_link_addr = false, changed = false; port = drm_dp_get_port(mstb, port_msg->port_number); if (!port) { port = drm_dp_mst_add_port(dev, mgr, mstb, port_msg->port_number); if (!port) - return; + return -ENOMEM; created = true; - } else if (port_msg->input_port && !port->input && port->connector) { - /* Destroying the connector is impossible in this context, so - * replace the port with a new one + changed = true; + } else if (!port->input && port_msg->input_port && port->connector) { + /* Since port->connector can't be changed here, we create a + * new port if input_port changes from 0 to 1 */ drm_dp_mst_topology_unlink_port(mgr, port); drm_dp_mst_topology_put_port(port); - port = drm_dp_mst_add_port(dev, mgr, mstb, port_msg->port_number); if (!port) - return; + return -ENOMEM; + changed = true; created = true; - } else { - /* Locking is only needed when the port has a connector - * exposed to userspace + } else if (port->input && !port_msg->input_port) { + changed = true; + } else if (port->connector) { + /* We're updating a port that's exposed to userspace, so do it + * under lock */ drm_modeset_lock(&mgr->base.lock, NULL); + old_ddps = port->ddps; + changed = port->ddps != port_msg->ddps || + (port->ddps && + (port->ldps != port_msg->legacy_device_plug_status || + port->dpcd_rev != port_msg->dpcd_revision || + port->mcs != port_msg->mcs || + port->pdt != port_msg->peer_device_type || + port->num_sdp_stream_sinks != + port_msg->num_sdp_stream_sinks)); } port->input = port_msg->input_port; @@ -2054,23 +2066,38 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, goto fail; } - if (!created) + /* + * If this port wasn't just created, then we're reprobing because + * we're coming out of suspend. In this case, always resend the link + * address if there's an MSTB on this port + */ + if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING) + send_link_addr = true; + + if (port->connector) drm_modeset_unlock(&mgr->base.lock); - else if (!port->connector && !port->input) + else if (!port->input) drm_dp_mst_port_add_connector(mstb, port); - if (send_link_addr && port->mstb) - drm_dp_send_link_address(mgr, port->mstb); + if (send_link_addr && port->mstb) { + ret = drm_dp_send_link_address(mgr, port->mstb); + if (ret == 1) /* MSTB below us changed */ + changed = true; + else if (ret < 0) + goto fail_put; + } /* put reference to this port */ drm_dp_mst_topology_put_port(port); - return; + return changed; fail: drm_dp_mst_topology_unlink_port(mgr, port); - drm_dp_mst_topology_put_port(port); - if (!created) + if (port->connector) drm_modeset_unlock(&mgr->base.lock); +fail_put: + drm_dp_mst_topology_put_port(port); + return ret; } static void @@ -2228,13 +2255,20 @@ drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, return mstb; } -static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, +static int drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) { struct drm_dp_mst_port *port; + int ret; + bool changed = false; - if (!mstb->link_address_sent) - drm_dp_send_link_address(mgr, mstb); + if (!mstb->link_address_sent) { + ret = drm_dp_send_link_address(mgr, mstb); + if (ret == 1) + changed = true; + else if (ret < 0) + return ret; + } list_for_each_entry(port, &mstb->ports, next) { struct drm_dp_mst_branch *mstb_child = NULL; @@ -2246,6 +2280,7 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m drm_modeset_lock(&mgr->base.lock, NULL); drm_dp_send_enum_path_resources(mgr, mstb, port); drm_modeset_unlock(&mgr->base.lock); + changed = true; } if (port->mstb) @@ -2253,10 +2288,17 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m mgr, port->mstb); if (mstb_child) { - drm_dp_check_and_send_link_address(mgr, mstb_child); + ret = drm_dp_check_and_send_link_address(mgr, + mstb_child); drm_dp_mst_topology_put_mstb(mstb_child); + if (ret == 1) + changed = true; + else if (ret < 0) + return ret; } } + + return changed; } static void drm_dp_mst_link_probe_work(struct work_struct *work) @@ -2282,11 +2324,12 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work) return; } - drm_dp_check_and_send_link_address(mgr, mstb); + ret = drm_dp_check_and_send_link_address(mgr, mstb); drm_dp_mst_topology_put_mstb(mstb); mutex_unlock(&mgr->probe_lock); - drm_kms_helper_hotplug_event(dev); + if (ret) + drm_kms_helper_hotplug_event(dev); } static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, @@ -2532,16 +2575,18 @@ drm_dp_dump_link_address(struct drm_dp_link_address_ack_reply *reply) } } -static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) { struct drm_dp_sideband_msg_tx *txmsg; struct drm_dp_link_address_ack_reply *reply; - int i, len, ret; + struct drm_dp_mst_port *port, *tmp; + int i, len, ret, port_mask = 0; + bool changed = false; txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); if (!txmsg) - return; + return -ENOMEM; txmsg->dst = mstb; len = build_link_address(txmsg); @@ -2567,14 +2612,39 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, drm_dp_check_mstb_guid(mstb, reply->guid); - for (i = 0; i < reply->nports; i++) - drm_dp_mst_handle_link_address_port(mstb, mgr->dev, - &reply->ports[i]); + for (i = 0; i < reply->nports; i++) { + port_mask |= BIT(reply->ports[i].port_number); + ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev, + &reply->ports[i]); + if (ret == 1) + changed = true; + else if (ret < 0) + goto out; + } + + /* Prune any ports that are currently a part of mstb in our in-memory + * topology, but were not seen in this link address. Usually this + * means that they were removed while the topology was out of sync, + * e.g. during suspend/resume + */ + mutex_lock(&mgr->lock); + list_for_each_entry_safe(port, tmp, &mstb->ports, next) { + if (port_mask & BIT(port->port_num)) + continue; + + DRM_DEBUG_KMS("port %d was not in link address, removing\n", + port->port_num); + list_del(&port->next); + drm_dp_mst_topology_put_port(port); + changed = true; + } + mutex_unlock(&mgr->lock); out: if (ret <= 0) mstb->link_address_sent = false; kfree(txmsg); + return ret < 0 ? ret : changed; } static int @@ -3179,6 +3249,23 @@ out_unlock: } EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); +static void +drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) +{ + struct drm_dp_mst_port *port; + + /* The link address will need to be re-sent on resume */ + mstb->link_address_sent = false; + + list_for_each_entry(port, &mstb->ports, next) { + /* The PBN for each port will also need to be re-probed */ + port->available_pbn = 0; + + if (port->mstb) + drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb); + } +} + /** * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager * @mgr: manager to suspend @@ -3195,20 +3282,36 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) flush_work(&mgr->up_req_work); flush_work(&mgr->work); flush_work(&mgr->delayed_destroy_work); + + mutex_lock(&mgr->lock); + if (mgr->mst_state && mgr->mst_primary) + drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); + mutex_unlock(&mgr->lock); } EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); /** * drm_dp_mst_topology_mgr_resume() - resume the MST manager * @mgr: manager to resume + * @sync: whether or not to perform topology reprobing synchronously * * This will fetch DPCD and see if the device is still there, * if it is, it will rewrite the MSTM control bits, and return. * - * if the device fails this returns -1, and the driver should do + * If the device fails this returns -1, and the driver should do * a full MST reprobe, in case we were undocked. + * + * During system resume (where it is assumed that the driver will be calling + * drm_atomic_helper_resume()) this function should be called beforehand with + * @sync set to true. In contexts like runtime resume where the driver is not + * expected to be calling drm_atomic_helper_resume(), this function should be + * called with @sync set to false in order to avoid deadlocking. + * + * Returns: -1 if the MST topology was removed while we were suspended, 0 + * otherwise. */ -int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) +int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, + bool sync) { int ret; u8 guid[16]; @@ -3241,8 +3344,19 @@ int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) } drm_dp_check_mstb_guid(mgr->mst_primary, guid); + /* + * For the final step of resuming the topology, we need to bring the + * state of our in-memory topology back into sync with reality. So, + * restart the probing process as if we're probing a new hub + */ + queue_work(system_long_wq, &mgr->work); mutex_unlock(&mgr->lock); + if (sync) { + DRM_DEBUG_KMS("Waiting for link probe work to finish re-syncing topology...\n"); + flush_work(&mgr->work); + } + return 0; out_fail: diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 5eeafa45831a..403b593a3eb4 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -7625,7 +7625,8 @@ void intel_dp_mst_resume(struct drm_i915_private *dev_priv) if (!intel_dp->can_mst) continue; - ret = drm_dp_mst_topology_mgr_resume(&intel_dp->mst_mgr); + ret = drm_dp_mst_topology_mgr_resume(&intel_dp->mst_mgr, + true); if (ret) { intel_dp->is_mst = false; drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index a9d6aa110cfd..549486f1d937 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -1309,14 +1309,14 @@ nv50_mstm_fini(struct nv50_mstm *mstm) } static void -nv50_mstm_init(struct nv50_mstm *mstm) +nv50_mstm_init(struct nv50_mstm *mstm, bool runtime) { int ret; if (!mstm || !mstm->mgr.mst_state) return; - ret = drm_dp_mst_topology_mgr_resume(&mstm->mgr); + ret = drm_dp_mst_topology_mgr_resume(&mstm->mgr, !runtime); if (ret == -1) { drm_dp_mst_topology_mgr_set_mst(&mstm->mgr, false); drm_kms_helper_hotplug_event(mstm->mgr.dev); @@ -2263,7 +2263,7 @@ nv50_display_init(struct drm_device *dev, bool resume, bool runtime) if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST) { struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); - nv50_mstm_init(nv_encoder->dp.mstm); + nv50_mstm_init(nv_encoder->dp.mstm, runtime); } } diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index fd142db42cb0..144027e27464 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -706,7 +706,8 @@ void drm_dp_mst_dump_topology(struct seq_file *m, void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); int __must_check -drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); +drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, + bool sync); ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, unsigned int offset, void *buffer, size_t size); |