diff options
Diffstat (limited to 'drivers/gpu/drm/display/drm_dp_mst_topology.c')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_mst_topology.c | 1118 |
1 files changed, 724 insertions, 394 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 847c10aa2098..64e5c176d5cc 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -23,13 +23,13 @@ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/errno.h> +#include <linux/export.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/random.h> #include <linux/sched.h> #include <linux/seq_file.h> -#include <linux/iopoll.h> #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) #include <linux/stacktrace.h> @@ -43,6 +43,7 @@ #include <drm/drm_atomic_helper.h> #include <drm/drm_drv.h> #include <drm/drm_edid.h> +#include <drm/drm_fixed.h> #include <drm/drm_print.h> #include <drm/drm_probe_helper.h> @@ -67,9 +68,6 @@ static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port); -static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, - int id, u8 start_slot, u8 num_slots); - static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int offset, int size, u8 *bytes); @@ -88,7 +86,7 @@ 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); static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, - u8 *guid); + guid_t *guid); static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port); static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port); @@ -174,18 +172,30 @@ static const char *drm_dp_mst_sideband_tx_state_str(int state) return sideband_reason_str[state]; } +static inline u8 +drm_dp_mst_get_ufp_num_at_lct_from_rad(u8 lct, const u8 *rad) +{ + int idx = (lct / 2) - 1; + int shift = (lct % 2) ? 0 : 4; + u8 ufp_num; + + /* mst_primary, it's rad is unset*/ + if (lct == 1) + return 0; + + ufp_num = (rad[idx] >> shift) & 0xf; + + return ufp_num; +} + static int drm_dp_mst_rad_to_str(const u8 rad[8], u8 lct, char *out, size_t len) { int i; - u8 unpacked_rad[16]; + u8 unpacked_rad[16] = {}; - for (i = 0; i < lct; i++) { - if (i % 2) - unpacked_rad[i] = rad[i / 2] >> 4; - else - unpacked_rad[i] = rad[i / 2] & BIT_MASK(4); - } + for (i = 0; i < lct; i++) + unpacked_rad[i] = drm_dp_mst_get_ufp_num_at_lct_from_rad(i + 1, rad); /* TODO: Eventually add something to printk so we can format the rad * like this: 1.2.3 @@ -319,6 +329,9 @@ static bool drm_dp_decode_sideband_msg_hdr(const struct drm_dp_mst_topology_mgr hdr->broadcast = (buf[idx] >> 7) & 0x1; hdr->path_msg = (buf[idx] >> 6) & 0x1; hdr->msg_len = buf[idx] & 0x3f; + if (hdr->msg_len < 1) /* min space for body CRC */ + return false; + idx++; hdr->somt = (buf[idx] >> 7) & 0x1; hdr->eomt = (buf[idx] >> 6) & 0x1; @@ -800,7 +813,7 @@ static bool drm_dp_sideband_parse_link_address(const struct drm_dp_mst_topology_ int idx = 1; int i; - memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); + import_guid(&repmsg->u.link_addr.guid, &raw->msg[idx]); idx += 16; repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; idx++; @@ -828,7 +841,7 @@ static bool drm_dp_sideband_parse_link_address(const struct drm_dp_mst_topology_ idx++; if (idx > raw->curlen) goto fail_len; - memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); + import_guid(&repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx]); idx += 16; if (idx > raw->curlen) goto fail_len; @@ -1028,7 +1041,7 @@ static bool drm_dp_sideband_parse_reply(const struct drm_dp_mst_topology_mgr *mg msg->req_type = (raw->msg[0] & 0x7f); if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) { - memcpy(msg->u.nak.guid, &raw->msg[1], 16); + import_guid(&msg->u.nak.guid, &raw->msg[1]); msg->u.nak.reason = raw->msg[17]; msg->u.nak.nak_data = raw->msg[18]; return false; @@ -1077,7 +1090,7 @@ drm_dp_sideband_parse_connection_status_notify(const struct drm_dp_mst_topology_ if (idx > raw->curlen) goto fail_len; - memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); + import_guid(&msg->u.conn_stat.guid, &raw->msg[idx]); idx += 16; if (idx > raw->curlen) goto fail_len; @@ -1106,7 +1119,7 @@ static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst if (idx > raw->curlen) goto fail_len; - memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); + import_guid(&msg->u.resource_stat.guid, &raw->msg[idx]); idx += 16; if (idx > raw->curlen) goto fail_len; @@ -1305,7 +1318,8 @@ static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, } out: if (unlikely(ret == -EIO) && drm_debug_enabled(DRM_UT_DP)) { - struct drm_printer p = drm_debug_printer(DBG_PREFIX); + struct drm_printer p = drm_dbg_printer(mgr->dev, DRM_UT_DP, + DBG_PREFIX); drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); } @@ -1592,10 +1606,11 @@ topology_ref_type_to_str(enum drm_dp_mst_topology_ref_type type) } static void -__dump_topology_ref_history(struct drm_dp_mst_topology_ref_history *history, +__dump_topology_ref_history(struct drm_device *drm, + struct drm_dp_mst_topology_ref_history *history, void *ptr, const char *type_str) { - struct drm_printer p = drm_debug_printer(DBG_PREFIX); + struct drm_printer p = drm_dbg_printer(drm, DRM_UT_DP, DBG_PREFIX); char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); int i; @@ -1637,15 +1652,15 @@ out: static __always_inline void drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) { - __dump_topology_ref_history(&mstb->topology_ref_history, mstb, - "MSTB"); + __dump_topology_ref_history(mstb->mgr->dev, &mstb->topology_ref_history, + mstb, "MSTB"); } static __always_inline void drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) { - __dump_topology_ref_history(&port->topology_ref_history, port, - "Port"); + __dump_topology_ref_history(port->mgr->dev, &port->topology_ref_history, + port, "Port"); } static __always_inline void @@ -1823,7 +1838,7 @@ static void drm_dp_destroy_port(struct kref *kref) return; } - kfree(port->cached_edid); + drm_edid_free(port->cached_edid); /* * we can't destroy the connector here, as we might be holding the @@ -2171,27 +2186,27 @@ ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, offset, size, buffer); } -static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) +static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, guid_t *guid) { int ret = 0; - memcpy(mstb->guid, guid, 16); + guid_copy(&mstb->guid, guid); - if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { - if (mstb->port_parent) { - ret = drm_dp_send_dpcd_write(mstb->mgr, - mstb->port_parent, - DP_GUID, 16, mstb->guid); - } else { - ret = drm_dp_dpcd_write(mstb->mgr->aux, - DP_GUID, mstb->guid, 16); - } - } + if (!drm_dp_validate_guid(mstb->mgr, &mstb->guid)) { + struct drm_dp_aux *aux; + u8 buf[UUID_SIZE]; + + export_guid(buf, &mstb->guid); + + if (mstb->port_parent) + aux = &mstb->port_parent->aux; + else + aux = mstb->mgr->aux; - if (ret < 16 && ret > 0) - return -EPROTO; + ret = drm_dp_dpcd_write_data(aux, DP_GUID, buf, sizeof(buf)); + } - return ret == 16 ? 0 : ret; + return ret; } static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, @@ -2271,11 +2286,11 @@ drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb, if (port->pdt != DP_PEER_DEVICE_NONE && drm_dp_mst_is_end_device(port->pdt, port->mcs) && - port->port_num >= DP_MST_LOGICAL_PORT_0) - port->cached_edid = drm_get_edid(port->connector, - &port->aux.ddc); + drm_dp_mst_port_is_logical(port)) + port->cached_edid = drm_edid_read_ddc(port->connector, + &port->aux.ddc); - drm_connector_register(port->connector); + drm_connector_dynamic_register(port->connector); return; error: @@ -2336,7 +2351,7 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, { struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; struct drm_dp_mst_port *port; - int old_ddps = 0, ret; + int ret; u8 new_pdt = DP_PEER_DEVICE_NONE; bool new_mcs = 0; bool created = false, send_link_addr = false, changed = false; @@ -2369,7 +2384,6 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, */ 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 || @@ -2404,15 +2418,13 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, * Reprobe PBN caps on both hotplug, and when re-probing the link * for our parent mstb */ - if (old_ddps != port->ddps || !created) { - if (port->ddps && !port->input) { - ret = drm_dp_send_enum_path_resources(mgr, mstb, - port); - if (ret == 1) - changed = true; - } else { - port->full_pbn = 0; - } + if (port->ddps && !port->input) { + ret = drm_dp_send_enum_path_resources(mgr, mstb, + port); + if (ret == 1) + changed = true; + } else { + port->full_pbn = 0; } ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); @@ -2541,9 +2553,8 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_ if (!mstb) goto out; - for (i = 0; i < lct - 1; i++) { - int shift = (i % 2) ? 0 : 4; - int port_num = (rad[i / 2] >> shift) & 0xf; + for (i = 1; i < lct; i++) { + int port_num = drm_dp_mst_get_ufp_num_at_lct_from_rad(i + 1, rad); list_for_each_entry(port, &mstb->ports, next) { if (port->port_num == port_num) { @@ -2567,21 +2578,20 @@ out: return mstb; } -static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( - struct drm_dp_mst_branch *mstb, - const uint8_t *guid) +static struct drm_dp_mst_branch * +get_mst_branch_device_by_guid_helper(struct drm_dp_mst_branch *mstb, + const guid_t *guid) { struct drm_dp_mst_branch *found_mstb; struct drm_dp_mst_port *port; - if (memcmp(mstb->guid, guid, 16) == 0) - return mstb; + if (!mstb) + return NULL; + if (guid_equal(&mstb->guid, guid)) + return mstb; list_for_each_entry(port, &mstb->ports, next) { - if (!port->mstb) - continue; - found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); if (found_mstb) @@ -2593,7 +2603,7 @@ static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( static struct drm_dp_mst_branch * drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, - const uint8_t *guid) + const guid_t *guid) { struct drm_dp_mst_branch *mstb; int ret; @@ -2689,18 +2699,18 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work) drm_kms_helper_hotplug_event(dev); } -static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, - u8 *guid) +static void drm_dp_mst_queue_probe_work(struct drm_dp_mst_topology_mgr *mgr) { - u64 salt; + queue_work(system_long_wq, &mgr->work); +} - if (memchr_inv(guid, 0, 16)) +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, + guid_t *guid) +{ + if (!guid_is_null(guid)) return true; - salt = get_jiffies_64(); - - memcpy(&guid[0], &salt, sizeof(u64)); - memcpy(&guid[8], &salt, sizeof(u64)); + guid_gen(guid); return false; } @@ -2731,14 +2741,13 @@ retry: do { tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); - ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, - &msg[offset], - tosend); - if (ret != tosend) { - if (ret == -EIO && retries < 5) { - retries++; - goto retry; - } + ret = drm_dp_dpcd_write_data(mgr->aux, regbase + offset, + &msg[offset], + tosend); + if (ret == -EIO && retries < 5) { + retries++; + goto retry; + } else if (ret < 0) { drm_dbg_kms(mgr->dev, "failed to dpcd write %d %d\n", tosend, ret); return -EIO; @@ -2823,7 +2832,9 @@ static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); if (ret) { if (drm_debug_enabled(DRM_UT_DP)) { - struct drm_printer p = drm_debug_printer(DBG_PREFIX); + struct drm_printer p = drm_dbg_printer(mgr->dev, + DRM_UT_DP, + DBG_PREFIX); drm_printf(&p, "sideband msg failed to send\n"); drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); @@ -2868,7 +2879,8 @@ static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, list_add_tail(&txmsg->next, &mgr->tx_msg_downq); if (drm_debug_enabled(DRM_UT_DP)) { - struct drm_printer p = drm_debug_printer(DBG_PREFIX); + struct drm_printer p = drm_dbg_printer(mgr->dev, DRM_UT_DP, + DBG_PREFIX); drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); } @@ -2923,7 +2935,7 @@ static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, /* FIXME: Actually do some real error handling here */ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret <= 0) { + if (ret < 0) { drm_err(mgr->dev, "Sending link address failed with %d\n", ret); goto out; } @@ -2937,7 +2949,7 @@ static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, drm_dbg_kms(mgr->dev, "link address reply: %d\n", reply->nports); drm_dp_dump_link_address(mgr, reply); - ret = drm_dp_check_mstb_guid(mstb, reply->guid); + ret = drm_dp_check_mstb_guid(mstb, &reply->guid); if (ret) { char buf[64]; @@ -2975,7 +2987,7 @@ static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, mutex_unlock(&mgr->lock); out: - if (ret <= 0) + if (ret < 0) mstb->link_address_sent = false; kfree(txmsg); return ret < 0 ? ret : changed; @@ -3255,15 +3267,15 @@ out_get_port: } EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status); -static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_atomic_payload *payload) +static int drm_dp_create_payload_at_dfp(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_atomic_payload *payload) { - return drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, + return drm_dp_dpcd_write_payload(mgr->aux, payload->vcpi, payload->vc_start_slot, payload->time_slots); } -static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_atomic_payload *payload) +static int drm_dp_create_payload_to_remote(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_atomic_payload *payload) { int ret; struct drm_dp_mst_port *port = drm_dp_mst_topology_get_port_validated(mgr, payload->port); @@ -3276,17 +3288,20 @@ static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, return ret; } -static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_topology_state *mst_state, - struct drm_dp_mst_atomic_payload *payload) +static void drm_dp_destroy_payload_at_remote_and_dfp(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_topology_state *mst_state, + struct drm_dp_mst_atomic_payload *payload) { drm_dbg_kms(mgr->dev, "\n"); /* it's okay for these to fail */ - drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0); - drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0); + if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE) { + drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0); + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP; + } - return 0; + if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_DFP) + drm_dp_dpcd_write_payload(mgr->aux, payload->vcpi, payload->vc_start_slot, 0); } /** @@ -3296,10 +3311,9 @@ static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, * @payload: The payload to write * * Determines the starting time slot for the given payload, and programs the VCPI for this payload - * into hardware. After calling this, the driver should generate ACT and payload packets. + * into the DPCD of DPRX. After calling this, the driver should generate ACT and payload packets. * - * Returns: 0 on success, error code on failure. In the event that this fails, - * @payload.vc_start_slot will also be set to -1. + * Returns: 0 on success, error code on failure. */ int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_topology_state *mst_state, @@ -3308,85 +3322,111 @@ int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port; int ret; + /* Update mst mgr info */ + if (mgr->payload_count == 0) + mgr->next_start_slot = mst_state->start_slot; + + payload->vc_start_slot = mgr->next_start_slot; + + mgr->payload_count++; + mgr->next_start_slot += payload->time_slots; + + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL; + + /* Allocate payload to immediate downstream facing port */ port = drm_dp_mst_topology_get_port_validated(mgr, payload->port); if (!port) { drm_dbg_kms(mgr->dev, - "VCPI %d for port %p not in topology, not creating a payload\n", + "VCPI %d for port %p not in topology, not creating a payload to remote\n", payload->vcpi, payload->port); - payload->vc_start_slot = -1; - return 0; + return -EIO; } - if (mgr->payload_count == 0) - mgr->next_start_slot = mst_state->start_slot; - - payload->vc_start_slot = mgr->next_start_slot; - - ret = drm_dp_create_payload_step1(mgr, payload); - drm_dp_mst_topology_put_port(port); + ret = drm_dp_create_payload_at_dfp(mgr, payload); if (ret < 0) { - drm_warn(mgr->dev, "Failed to create MST payload for port %p: %d\n", - payload->port, ret); - payload->vc_start_slot = -1; - return ret; + drm_dbg_kms(mgr->dev, "Failed to create MST payload for port %p: %d\n", + payload->port, ret); + goto put_port; } - mgr->payload_count++; - mgr->next_start_slot += payload->time_slots; + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP; - return 0; +put_port: + drm_dp_mst_topology_put_port(port); + + return ret; } EXPORT_SYMBOL(drm_dp_add_payload_part1); /** - * drm_dp_remove_payload() - Remove an MST payload + * drm_dp_remove_payload_part1() - Remove an MST payload along the virtual channel * @mgr: Manager to use. * @mst_state: The MST atomic state - * @payload: The payload to write + * @payload: The payload to remove * - * Removes a payload from an MST topology if it was successfully assigned a start slot. Also updates - * the starting time slots of all other payloads which would have been shifted towards the start of - * the VC table as a result. After calling this, the driver should generate ACT and payload packets. + * Removes a payload along the virtual channel if it was successfully allocated. + * After calling this, the driver should set HW to generate ACT and then switch to new + * payload allocation state. */ -void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_topology_state *mst_state, - struct drm_dp_mst_atomic_payload *payload) +void drm_dp_remove_payload_part1(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_topology_state *mst_state, + struct drm_dp_mst_atomic_payload *payload) { - struct drm_dp_mst_atomic_payload *pos; + /* Remove remote payload allocation */ bool send_remove = false; - /* We failed to make the payload, so nothing to do */ - if (payload->vc_start_slot == -1) - return; - mutex_lock(&mgr->lock); send_remove = drm_dp_mst_port_downstream_of_branch(payload->port, mgr->mst_primary); mutex_unlock(&mgr->lock); if (send_remove) - drm_dp_destroy_payload_step1(mgr, mst_state, payload); + drm_dp_destroy_payload_at_remote_and_dfp(mgr, mst_state, payload); else drm_dbg_kms(mgr->dev, "Payload for VCPI %d not in topology, not sending remove\n", payload->vcpi); + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL; +} +EXPORT_SYMBOL(drm_dp_remove_payload_part1); + +/** + * drm_dp_remove_payload_part2() - Remove an MST payload locally + * @mgr: Manager to use. + * @mst_state: The MST atomic state + * @old_payload: The payload with its old state + * @new_payload: The payload with its latest state + * + * Updates the starting time slots of all other payloads which would have been shifted towards + * the start of the payload ID table as a result of removing a payload. Driver should call this + * function whenever it removes a payload in its HW. It's independent to the result of payload + * allocation/deallocation at branch devices along the virtual channel. + */ +void drm_dp_remove_payload_part2(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_topology_state *mst_state, + const struct drm_dp_mst_atomic_payload *old_payload, + struct drm_dp_mst_atomic_payload *new_payload) +{ + struct drm_dp_mst_atomic_payload *pos; + + /* Remove local payload allocation */ list_for_each_entry(pos, &mst_state->payloads, next) { - if (pos != payload && pos->vc_start_slot > payload->vc_start_slot) - pos->vc_start_slot -= payload->time_slots; + if (pos != new_payload && pos->vc_start_slot > new_payload->vc_start_slot) + pos->vc_start_slot -= old_payload->time_slots; } - payload->vc_start_slot = -1; + new_payload->vc_start_slot = -1; mgr->payload_count--; - mgr->next_start_slot -= payload->time_slots; + mgr->next_start_slot -= old_payload->time_slots; - if (payload->delete) - drm_dp_mst_put_port_malloc(payload->port); -} -EXPORT_SYMBOL(drm_dp_remove_payload); + if (new_payload->delete) + drm_dp_mst_put_port_malloc(new_payload->port); + new_payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE; +} +EXPORT_SYMBOL(drm_dp_remove_payload_part2); /** * drm_dp_add_payload_part2() - Execute payload update part 2 * @mgr: Manager to use. - * @state: The global atomic state * @payload: The payload to update * * If @payload was successfully assigned a starting time slot by drm_dp_add_payload_part1(), this @@ -3395,27 +3435,24 @@ EXPORT_SYMBOL(drm_dp_remove_payload); * Returns: 0 on success, negative error code on failure. */ int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr, - struct drm_atomic_state *state, struct drm_dp_mst_atomic_payload *payload) { int ret = 0; /* Skip failed payloads */ - if (payload->vc_start_slot == -1) { - drm_dbg_kms(state->dev, "Part 1 of payload creation for %s failed, skipping part 2\n", + if (payload->payload_allocation_status != DRM_DP_MST_PAYLOAD_ALLOCATION_DFP) { + drm_dbg_kms(mgr->dev, "Part 1 of payload creation for %s failed, skipping part 2\n", payload->port->connector->name); return -EIO; } - ret = drm_dp_create_payload_step2(mgr, payload); - if (ret < 0) { - if (!payload->delete) - drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n", - payload->port, ret); - else - drm_dbg_kms(mgr->dev, "Step 2 of removing MST payload for %p failed: %d\n", - payload->port, ret); - } + /* Allocate payload to remote end */ + ret = drm_dp_create_payload_to_remote(mgr, payload); + if (ret < 0) + drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n", + payload->port, ret); + else + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE; return ret; } @@ -3542,8 +3579,7 @@ static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, } /** - * drm_dp_get_vc_payload_bw - get the VC payload BW for an MST link - * @mgr: The &drm_dp_mst_topology_mgr to use + * drm_dp_get_vc_payload_bw - get the VC payload BW for an MTP link * @link_rate: link rate in 10kbits/s units * @link_lane_count: lane count * @@ -3551,38 +3587,49 @@ static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, * value is in units of PBNs/(timeslots/1 MTP). This value can be used to * convert the number of PBNs required for a given stream to the number of * timeslots this stream requires in each MTP. + * + * Returns the BW / timeslot value in 20.12 fixed point format. */ -int drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr, - int link_rate, int link_lane_count) +fixed20_12 drm_dp_get_vc_payload_bw(int link_rate, int link_lane_count) { - if (link_rate == 0 || link_lane_count == 0) - drm_dbg_kms(mgr->dev, "invalid link rate/lane count: (%d / %d)\n", - link_rate, link_lane_count); + int ch_coding_efficiency = + drm_dp_bw_channel_coding_efficiency(drm_dp_is_uhbr_rate(link_rate)); + fixed20_12 ret; - /* See DP v2.0 2.6.4.2, VCPayload_Bandwidth_for_OneTimeSlotPer_MTP_Allocation */ - return link_rate * link_lane_count / 54000; + /* See DP v2.0 2.6.4.2, 2.7.6.3 VCPayload_Bandwidth_for_OneTimeSlotPer_MTP_Allocation */ + ret.full = DIV_ROUND_DOWN_ULL(mul_u32_u32(link_rate * link_lane_count, + ch_coding_efficiency), + (1000000ULL * 8 * 5400) >> 12); + + return ret; } EXPORT_SYMBOL(drm_dp_get_vc_payload_bw); /** - * drm_dp_read_mst_cap() - check whether or not a sink supports MST + * drm_dp_read_mst_cap() - Read the sink's MST mode capability * @aux: The DP AUX channel to use * @dpcd: A cached copy of the DPCD capabilities for this sink * - * Returns: %True if the sink supports MST, %false otherwise + * Returns: enum drm_dp_mst_mode to indicate MST mode capability */ -bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, - const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +enum drm_dp_mst_mode drm_dp_read_mst_cap(struct drm_dp_aux *aux, + const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { u8 mstm_cap; if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_12) - return false; + return DRM_DP_SST; - if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1) - return false; + if (drm_dp_dpcd_read_byte(aux, DP_MSTM_CAP, &mstm_cap) < 0) + return DRM_DP_SST; + + if (mstm_cap & DP_MST_CAP) + return DRM_DP_MST; + + if (mstm_cap & DP_SINGLE_STREAM_SIDEBAND_MSG) + return DRM_DP_SST_SIDEBAND_MSG; - return mstm_cap & DP_MST_CAP; + return DRM_DP_SST; } EXPORT_SYMBOL(drm_dp_read_mst_cap); @@ -3628,17 +3675,17 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms mgr->mst_primary = mstb; drm_dp_mst_topology_get_mstb(mgr->mst_primary); - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | - DP_UP_REQ_EN | - DP_UPSTREAM_IS_SRC); + ret = drm_dp_dpcd_write_byte(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | + DP_UP_REQ_EN | + DP_UPSTREAM_IS_SRC); if (ret < 0) goto out_unlock; /* Write reset payload */ - drm_dp_dpcd_write_payload(mgr, 0, 0, 0x3f); + drm_dp_dpcd_clear_payload(mgr->aux); - queue_work(system_long_wq, &mgr->work); + drm_dp_mst_queue_probe_work(mgr); ret = 0; } else { @@ -3646,12 +3693,11 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms mstb = mgr->mst_primary; mgr->mst_primary = NULL; /* this can fail if the device is gone */ - drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); + drm_dp_dpcd_write_byte(mgr->aux, DP_MSTM_CTRL, 0); ret = 0; mgr->payload_id_table_cleared = false; - memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv)); - memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv)); + mgr->reset_rx_state = true; } out_unlock: @@ -3677,6 +3723,33 @@ drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) } /** + * drm_dp_mst_topology_queue_probe - Queue a topology probe + * @mgr: manager to probe + * + * Queue a work to probe the MST topology. Driver's should call this only to + * sync the topology's HW->SW state after the MST link's parameters have + * changed in a way the state could've become out-of-sync. This is the case + * for instance when the link rate between the source and first downstream + * branch device has switched between UHBR and non-UHBR rates. Except of those + * cases - for instance when a sink gets plugged/unplugged to a port - the SW + * state will get updated automatically via MST UP message notifications. + */ +void drm_dp_mst_topology_queue_probe(struct drm_dp_mst_topology_mgr *mgr) +{ + mutex_lock(&mgr->lock); + + if (drm_WARN_ON(mgr->dev, !mgr->mst_state || !mgr->mst_primary)) + goto out_unlock; + + drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); + drm_dp_mst_queue_probe_work(mgr); + +out_unlock: + mutex_unlock(&mgr->lock); +} +EXPORT_SYMBOL(drm_dp_mst_topology_queue_probe); + +/** * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager * @mgr: manager to suspend * @@ -3686,8 +3759,8 @@ drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) { mutex_lock(&mgr->lock); - drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | DP_UPSTREAM_IS_SRC); + drm_dp_dpcd_write_byte(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | DP_UPSTREAM_IS_SRC); mutex_unlock(&mgr->lock); flush_work(&mgr->up_req_work); flush_work(&mgr->work); @@ -3723,8 +3796,9 @@ EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, bool sync) { + u8 buf[UUID_SIZE]; + guid_t guid; int ret; - u8 guid[16]; mutex_lock(&mgr->lock); if (!mgr->mst_primary) @@ -3735,23 +3809,25 @@ int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, goto out_fail; } - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | - DP_UP_REQ_EN | - DP_UPSTREAM_IS_SRC); + ret = drm_dp_dpcd_write_byte(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | + DP_UP_REQ_EN | + DP_UPSTREAM_IS_SRC); if (ret < 0) { drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n"); goto out_fail; } /* Some hubs forget their guids after they resume */ - ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); - if (ret != 16) { + ret = drm_dp_dpcd_read_data(mgr->aux, DP_GUID, buf, sizeof(buf)); + if (ret < 0) { drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n"); goto out_fail; } - ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid); + import_guid(&guid, buf); + + ret = drm_dp_check_mstb_guid(mgr->mst_primary, &guid); if (ret) { drm_dbg_kms(mgr->dev, "check mstb failed - undocked during suspend?\n"); goto out_fail; @@ -3762,7 +3838,7 @@ int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, * 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); + drm_dp_mst_queue_probe_work(mgr); mutex_unlock(&mgr->lock); if (sync) { @@ -3779,6 +3855,11 @@ out_fail: } EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); +static void reset_msg_rx_state(struct drm_dp_sideband_msg_rx *msg) +{ + memset(msg, 0, sizeof(*msg)); +} + static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up, struct drm_dp_mst_branch **mstb) @@ -3798,8 +3879,8 @@ drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up, *mstb = NULL; len = min(mgr->max_dpcd_transaction_bytes, 16); - ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len); - if (ret != len) { + ret = drm_dp_dpcd_read_data(mgr->aux, basereg, replyblock, len); + if (ret < 0) { drm_dbg_kms(mgr->dev, "failed to read DPCD down rep %d %d\n", len, ret); return false; } @@ -3837,9 +3918,9 @@ drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up, curreply = len; while (replylen > 0) { len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); - ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, - replyblock, len); - if (ret != len) { + ret = drm_dp_dpcd_read_data(mgr->aux, basereg + curreply, + replyblock, len); + if (ret < 0) { drm_dbg_kms(mgr->dev, "failed to read a chunk (len %d, ret %d)\n", len, ret); return false; @@ -3857,6 +3938,34 @@ drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up, return true; } +static int get_msg_request_type(u8 data) +{ + return data & 0x7f; +} + +static bool verify_rx_request_type(struct drm_dp_mst_topology_mgr *mgr, + const struct drm_dp_sideband_msg_tx *txmsg, + const struct drm_dp_sideband_msg_rx *rxmsg) +{ + const struct drm_dp_sideband_msg_hdr *hdr = &rxmsg->initial_hdr; + const struct drm_dp_mst_branch *mstb = txmsg->dst; + int tx_req_type = get_msg_request_type(txmsg->msg[0]); + int rx_req_type = get_msg_request_type(rxmsg->msg[0]); + char rad_str[64]; + + if (tx_req_type == rx_req_type) + return true; + + drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, rad_str, sizeof(rad_str)); + drm_dbg_kms(mgr->dev, + "Got unexpected MST reply, mstb: %p seqno: %d lct: %d rad: %s rx_req_type: %s (%02x) != tx_req_type: %s (%02x)\n", + mstb, hdr->seqno, mstb->lct, rad_str, + drm_dp_mst_req_type_str(rx_req_type), rx_req_type, + drm_dp_mst_req_type_str(tx_req_type), tx_req_type); + + return false; +} + static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) { struct drm_dp_sideband_msg_tx *txmsg; @@ -3872,9 +3981,9 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) /* find the message */ mutex_lock(&mgr->qlock); + txmsg = list_first_entry_or_null(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); - mutex_unlock(&mgr->qlock); /* Were we actually expecting a response, and from this mstb? */ if (!txmsg || txmsg->dst != mstb) { @@ -3883,6 +3992,15 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) hdr = &msg->initial_hdr; drm_dbg_kms(mgr->dev, "Got MST reply with no msg %p %d %d %02x %02x\n", mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg[0]); + + mutex_unlock(&mgr->qlock); + + goto out_clear_reply; + } + + if (!verify_rx_request_type(mgr, txmsg, msg)) { + mutex_unlock(&mgr->qlock); + goto out_clear_reply; } @@ -3898,20 +4016,15 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) txmsg->reply.u.nak.nak_data); } - memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx)); - drm_dp_mst_topology_put_mstb(mstb); - - mutex_lock(&mgr->qlock); txmsg->state = DRM_DP_SIDEBAND_TX_RX; list_del(&txmsg->next); + mutex_unlock(&mgr->qlock); wake_up_all(&mgr->tx_waitq); - return 0; - out_clear_reply: - memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx)); + reset_msg_rx_state(msg); out: if (mstb) drm_dp_mst_topology_put_mstb(mstb); @@ -3919,6 +4032,22 @@ out: return 0; } +static bool primary_mstb_probing_is_done(struct drm_dp_mst_topology_mgr *mgr) +{ + bool probing_done = false; + + mutex_lock(&mgr->lock); + + if (mgr->mst_primary && drm_dp_mst_topology_try_get_mstb(mgr->mst_primary)) { + probing_done = mgr->mst_primary->link_address_sent; + drm_dp_mst_topology_put_mstb(mgr->mst_primary); + } + + mutex_unlock(&mgr->lock); + + return probing_done; +} + static inline bool drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_pending_up_req *up_req) @@ -3929,12 +4058,12 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, bool hotplug = false, dowork = false; if (hdr->broadcast) { - const u8 *guid = NULL; + const guid_t *guid = NULL; if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) - guid = msg->u.conn_stat.guid; + guid = &msg->u.conn_stat.guid; else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY) - guid = msg->u.resource_stat.guid; + guid = &msg->u.resource_stat.guid; if (guid) mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid); @@ -3949,8 +4078,12 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, /* TODO: Add missing handler for DP_RESOURCE_STATUS_NOTIFY events */ if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) { - dowork = drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat); - hotplug = true; + if (!primary_mstb_probing_is_done(mgr)) { + drm_dbg_kms(mgr->dev, "Got CSN before finish topology probing. Skip it.\n"); + } else { + dowork = drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat); + hotplug = true; + } } drm_dp_mst_topology_put_mstb(mstb); @@ -3993,16 +4126,20 @@ static void drm_dp_mst_up_req_work(struct work_struct *work) static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) { struct drm_dp_pending_up_req *up_req; + struct drm_dp_mst_branch *mst_primary; + int ret = 0; if (!drm_dp_get_one_sb_msg(mgr, true, NULL)) - goto out; + goto out_clear_reply; if (!mgr->up_req_recv.have_eomt) return 0; up_req = kzalloc(sizeof(*up_req), GFP_KERNEL); - if (!up_req) - return -ENOMEM; + if (!up_req) { + ret = -ENOMEM; + goto out_clear_reply; + } INIT_LIST_HEAD(&up_req->next); @@ -4013,12 +4150,23 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) drm_dbg_kms(mgr->dev, "Received unknown up req type, ignoring: %x\n", up_req->msg.req_type); kfree(up_req); - goto out; + goto out_clear_reply; } - drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type, + mutex_lock(&mgr->lock); + mst_primary = mgr->mst_primary; + if (!mst_primary || !drm_dp_mst_topology_try_get_mstb(mst_primary)) { + mutex_unlock(&mgr->lock); + kfree(up_req); + goto out_clear_reply; + } + mutex_unlock(&mgr->lock); + + drm_dp_send_up_ack_reply(mgr, mst_primary, up_req->msg.req_type, false); + drm_dp_mst_topology_put_mstb(mst_primary); + if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { const struct drm_dp_connection_status_notify *conn_stat = &up_req->msg.u.conn_stat; @@ -4044,24 +4192,45 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) list_add_tail(&up_req->next, &mgr->up_req_list); mutex_unlock(&mgr->up_req_lock); queue_work(system_long_wq, &mgr->up_req_work); +out_clear_reply: + reset_msg_rx_state(&mgr->up_req_recv); + return ret; +} -out: - memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - return 0; +static void update_msg_rx_state(struct drm_dp_mst_topology_mgr *mgr) +{ + mutex_lock(&mgr->lock); + if (mgr->reset_rx_state) { + mgr->reset_rx_state = false; + reset_msg_rx_state(&mgr->down_rep_recv); + reset_msg_rx_state(&mgr->up_req_recv); + } + mutex_unlock(&mgr->lock); } /** - * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify + * drm_dp_mst_hpd_irq_handle_event() - MST hotplug IRQ handle MST event * @mgr: manager to notify irq for. * @esi: 4 bytes from SINK_COUNT_ESI + * @ack: 4 bytes used to ack events starting from SINK_COUNT_ESI * @handled: whether the hpd interrupt was consumed or not * - * This should be called from the driver when it detects a short IRQ, + * This should be called from the driver when it detects a HPD IRQ, * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The - * topology manager will process the sideband messages received as a result - * of this. + * topology manager will process the sideband messages received + * as indicated in the DEVICE_SERVICE_IRQ_VECTOR_ESI0 and set the + * corresponding flags that Driver has to ack the DP receiver later. + * + * Note that driver shall also call + * drm_dp_mst_hpd_irq_send_new_request() if the 'handled' is set + * after calling this function, to try to kick off a new request in + * the queue if the previous message transaction is completed. + * + * See also: + * drm_dp_mst_hpd_irq_send_new_request() */ -int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) +int drm_dp_mst_hpd_irq_handle_event(struct drm_dp_mst_topology_mgr *mgr, const u8 *esi, + u8 *ack, bool *handled) { int ret = 0; int sc; @@ -4073,21 +4242,52 @@ int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handl *handled = true; } + update_msg_rx_state(mgr); + if (esi[1] & DP_DOWN_REP_MSG_RDY) { ret = drm_dp_mst_handle_down_rep(mgr); *handled = true; + ack[1] |= DP_DOWN_REP_MSG_RDY; } if (esi[1] & DP_UP_REQ_MSG_RDY) { ret |= drm_dp_mst_handle_up_req(mgr); *handled = true; + ack[1] |= DP_UP_REQ_MSG_RDY; } - drm_dp_mst_kick_tx(mgr); return ret; } -EXPORT_SYMBOL(drm_dp_mst_hpd_irq); +EXPORT_SYMBOL(drm_dp_mst_hpd_irq_handle_event); + +/** + * drm_dp_mst_hpd_irq_send_new_request() - MST hotplug IRQ kick off new request + * @mgr: manager to notify irq for. + * + * This should be called from the driver when mst irq event is handled + * and acked. Note that new down request should only be sent when + * previous message transaction is completed. Source is not supposed to generate + * interleaved message transactions. + */ +void drm_dp_mst_hpd_irq_send_new_request(struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_dp_sideband_msg_tx *txmsg; + bool kick = true; + + mutex_lock(&mgr->qlock); + txmsg = list_first_entry_or_null(&mgr->tx_msg_downq, + struct drm_dp_sideband_msg_tx, next); + /* If last transaction is not completed yet*/ + if (!txmsg || + txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || + txmsg->state == DRM_DP_SIDEBAND_TX_SENT) + kick = false; + mutex_unlock(&mgr->qlock); + if (kick) + drm_dp_mst_kick_tx(mgr); +} +EXPORT_SYMBOL(drm_dp_mst_hpd_irq_send_new_request); /** * drm_dp_mst_detect_port() - get connection status for an MST port * @connector: DRM connector for this port @@ -4130,8 +4330,8 @@ drm_dp_mst_detect_port(struct drm_connector *connector, case DP_PEER_DEVICE_SST_SINK: ret = connector_status_connected; /* for logical ports - cache the EDID */ - if (port->port_num >= DP_MST_LOGICAL_PORT_0 && !port->cached_edid) - port->cached_edid = drm_get_edid(connector, &port->aux.ddc); + if (drm_dp_mst_port_is_logical(port) && !port->cached_edid) + port->cached_edid = drm_edid_read_ddc(connector, &port->aux.ddc); break; case DP_PEER_DEVICE_DP_LEGACY_CONV: if (port->ldps) @@ -4145,7 +4345,7 @@ out: EXPORT_SYMBOL(drm_dp_mst_detect_port); /** - * drm_dp_mst_get_edid() - get EDID for an MST port + * drm_dp_mst_edid_read() - get EDID for an MST port * @connector: toplevel connector to get EDID for * @mgr: manager for this port * @port: unverified pointer to a port. @@ -4154,9 +4354,11 @@ EXPORT_SYMBOL(drm_dp_mst_detect_port); * It validates the pointer still exists so the caller doesn't require a * reference. */ -struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +const struct drm_edid *drm_dp_mst_edid_read(struct drm_connector *connector, + struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port) { - struct edid *edid = NULL; + const struct drm_edid *drm_edid; /* we need to search for the port in the mgr in case it's gone */ port = drm_dp_mst_topology_get_port_validated(mgr, port); @@ -4164,12 +4366,41 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_ return NULL; if (port->cached_edid) - edid = drm_edid_duplicate(port->cached_edid); - else { - edid = drm_get_edid(connector, &port->aux.ddc); - } - port->has_audio = drm_detect_monitor_audio(edid); + drm_edid = drm_edid_dup(port->cached_edid); + else + drm_edid = drm_edid_read_ddc(connector, &port->aux.ddc); + drm_dp_mst_topology_put_port(port); + + return drm_edid; +} +EXPORT_SYMBOL(drm_dp_mst_edid_read); + +/** + * drm_dp_mst_get_edid() - get EDID for an MST port + * @connector: toplevel connector to get EDID for + * @mgr: manager for this port + * @port: unverified pointer to a port. + * + * This function is deprecated; please use drm_dp_mst_edid_read() instead. + * + * This returns an EDID for the port connected to a connector, + * It validates the pointer still exists so the caller doesn't require a + * reference. + */ +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, + struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port) +{ + const struct drm_edid *drm_edid; + struct edid *edid; + + drm_edid = drm_dp_mst_edid_read(connector, mgr, port); + + edid = drm_edid_duplicate(drm_edid_raw(drm_edid)); + + drm_edid_free(drm_edid); + return edid; } EXPORT_SYMBOL(drm_dp_mst_get_edid); @@ -4237,7 +4468,7 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state, } } - req_slots = DIV_ROUND_UP(pbn, topology_state->pbn_div); + req_slots = DIV_ROUND_UP(dfixed_const(pbn), topology_state->pbn_div.full); drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] TU %d -> %d\n", port->connector->base.id, port->connector->name, @@ -4255,6 +4486,7 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state, drm_dp_mst_get_port_malloc(port); payload->port = port; payload->vc_start_slot = -1; + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE; list_add(&payload->next, &topology_state->payloads); } payload->time_slots = req_slots; @@ -4424,7 +4656,7 @@ void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state) } /* Now that previous state is committed, it's safe to copy over the start slot - * assignments + * and allocation status assignments */ list_for_each_entry(old_payload, &old_mst_state->payloads, next) { if (old_payload->delete) @@ -4433,6 +4665,8 @@ void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state) new_payload = drm_atomic_get_mst_payload_state(new_mst_state, old_payload->port); new_payload->vc_start_slot = old_payload->vc_start_slot; + new_payload->payload_allocation_status = + old_payload->payload_allocation_status; } } } @@ -4518,61 +4752,6 @@ void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_ } EXPORT_SYMBOL(drm_dp_mst_update_slots); -static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, - int id, u8 start_slot, u8 num_slots) -{ - u8 payload_alloc[3], status; - int ret; - int retries = 0; - - drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, - DP_PAYLOAD_TABLE_UPDATED); - - payload_alloc[0] = id; - payload_alloc[1] = start_slot; - payload_alloc[2] = num_slots; - - ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); - if (ret != 3) { - drm_dbg_kms(mgr->dev, "failed to write payload allocation %d\n", ret); - goto fail; - } - -retry: - ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); - if (ret < 0) { - drm_dbg_kms(mgr->dev, "failed to read payload table status %d\n", ret); - goto fail; - } - - if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { - retries++; - if (retries < 20) { - usleep_range(10000, 20000); - goto retry; - } - drm_dbg_kms(mgr->dev, "status not set after read payload table status %d\n", - status); - ret = -EINVAL; - goto fail; - } - ret = 0; -fail: - return ret; -} - -static int do_get_act_status(struct drm_dp_aux *aux) -{ - int ret; - u8 status; - - ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); - if (ret < 0) - return ret; - - return status; -} - /** * drm_dp_check_act_status() - Polls for ACT handled status. * @mgr: manager to use @@ -4590,62 +4769,44 @@ int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) * There doesn't seem to be any recommended retry count or timeout in * the MST specification. Since some hubs have been observed to take * over 1 second to update their payload allocations under certain - * conditions, we use a rather large timeout value. + * conditions, we use a rather large timeout value of 3 seconds. */ - const int timeout_ms = 3000; - int ret, status; - - ret = readx_poll_timeout(do_get_act_status, mgr->aux, status, - status & DP_PAYLOAD_ACT_HANDLED || status < 0, - 200, timeout_ms * USEC_PER_MSEC); - if (ret < 0 && status >= 0) { - drm_err(mgr->dev, "Failed to get ACT after %dms, last status: %02x\n", - timeout_ms, status); - return -EINVAL; - } else if (status < 0) { - /* - * Failure here isn't unexpected - the hub may have - * just been unplugged - */ - drm_dbg_kms(mgr->dev, "Failed to read payload table status: %d\n", status); - return status; - } - - return 0; + return drm_dp_dpcd_poll_act_handled(mgr->aux, 3000); } EXPORT_SYMBOL(drm_dp_check_act_status); /** * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. - * @clock: dot clock for the mode - * @bpp: bpp for the mode. - * @dsc: DSC mode. If true, bpp has units of 1/16 of a bit per pixel + * @clock: dot clock + * @bpp: bpp as .4 binary fixed point * * This uses the formula in the spec to calculate the PBN value for a mode. */ -int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc) +int drm_dp_calc_pbn_mode(int clock, int bpp) { /* - * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on * common multiplier to render an integer PBN for all link rate/lane * counts combinations * calculate - * peak_kbps *= (1006/1000) - * peak_kbps *= (64/54) - * peak_kbps *= 8 convert to bytes - * - * If the bpp is in units of 1/16, further divide by 16. Put this - * factor in the numerator rather than the denominator to avoid - * integer overflow + * peak_kbps = clock * bpp / 16 + * peak_kbps *= SSC overhead / 1000000 + * peak_kbps /= 8 convert to Kbytes + * peak_kBps *= (64/54) / 1000 convert to PBN */ + /* + * TODO: Use the actual link and mode parameters to calculate + * the overhead. For now it's assumed that these are + * 4 link lanes, 4096 hactive pixels, which don't add any + * significant data padding overhead and that there is no DSC + * or FEC overhead. + */ + int overhead = drm_dp_bw_overhead(4, 4096, 0, bpp, + DRM_DP_BW_OVERHEAD_MST | + DRM_DP_BW_OVERHEAD_SSC_REF_CLK); - if (dsc) - return DIV_ROUND_UP_ULL(mul_u32_u32(clock * (bpp / 16), 64 * 1006), - 8 * 54 * 1000 * 1000); - - return DIV_ROUND_UP_ULL(mul_u32_u32(clock * bpp, 64 * 1006), - 8 * 54 * 1000 * 1000); + return DIV64_U64_ROUND_UP(mul_u32_u32(clock * bpp, 64 * overhead >> 4), + 1000000ULL * 8 * 54 * 1000); } EXPORT_SYMBOL(drm_dp_calc_pbn_mode); @@ -4716,9 +4877,9 @@ static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, int i; for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) { - if (drm_dp_dpcd_read(mgr->aux, - DP_PAYLOAD_TABLE_UPDATE_STATUS + i, - &buf[i], 16) != 16) + if (drm_dp_dpcd_read_data(mgr->aux, + DP_PAYLOAD_TABLE_UPDATE_STATUS + i, + &buf[i], 16) < 0) return false; } return true; @@ -4749,6 +4910,13 @@ void drm_dp_mst_dump_topology(struct seq_file *m, struct drm_dp_mst_atomic_payload *payload; int i, ret; + static const char *const status[] = { + "None", + "Local", + "DFP", + "Remote", + }; + mutex_lock(&mgr->lock); if (mgr->mst_primary) drm_dp_mst_dump_mstb(m, mgr->mst_primary); @@ -4763,9 +4931,10 @@ void drm_dp_mst_dump_topology(struct seq_file *m, state = to_drm_dp_mst_topology_state(mgr->base.state); seq_printf(m, "\n*** Atomic state info ***\n"); seq_printf(m, "payload_mask: %x, max_payloads: %d, start_slot: %u, pbn_div: %d\n", - state->payload_mask, mgr->max_payloads, state->start_slot, state->pbn_div); + state->payload_mask, mgr->max_payloads, state->start_slot, + dfixed_trunc(state->pbn_div)); - seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc | sink name |\n"); + seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc | status | sink name |\n"); for (i = 0; i < mgr->max_payloads; i++) { list_for_each_entry(payload, &state->payloads, next) { char name[14]; @@ -4774,7 +4943,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m, continue; fetch_monitor_name(mgr, payload->port, name, sizeof(name)); - seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %19s\n", + seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %8s %19s\n", i, payload->port->port_num, payload->vcpi, @@ -4782,6 +4951,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m, payload->vc_start_slot + payload->time_slots - 1, payload->pbn, payload->dsc_enabled ? "Y" : "N", + status[payload->payload_allocation_status], (*name != 0) ? name : "Unknown"); } } @@ -4798,30 +4968,31 @@ void drm_dp_mst_dump_topology(struct seq_file *m, } seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); - ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); - if (ret != 2) { + ret = drm_dp_dpcd_read_data(mgr->aux, DP_FAUX_CAP, buf, 2); + if (ret < 0) { seq_printf(m, "faux/mst read failed\n"); goto out; } seq_printf(m, "faux/mst: %*ph\n", 2, buf); - ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); - if (ret != 1) { + ret = drm_dp_dpcd_read_data(mgr->aux, DP_MSTM_CTRL, buf, 1); + if (ret < 0) { seq_printf(m, "mst ctrl read failed\n"); goto out; } seq_printf(m, "mst ctrl: %*ph\n", 1, buf); /* dump the standard OUI branch header */ - ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); - if (ret != DP_BRANCH_OUI_HEADER_SIZE) { + ret = drm_dp_dpcd_read_data(mgr->aux, DP_BRANCH_OUI, buf, + DP_BRANCH_OUI_HEADER_SIZE); + if (ret < 0) { seq_printf(m, "branch oui read failed\n"); goto out; } seq_printf(m, "branch oui: %*phN devid: ", 3, buf); for (i = 0x3; i < 0x8 && buf[i]; i++) - seq_printf(m, "%c", buf[i]); + seq_putc(m, buf[i]); seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); if (dump_dp_payload_table(mgr, buf)) @@ -5027,13 +5198,67 @@ static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, return false; } +static bool +drm_dp_mst_port_downstream_of_parent_locked(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + struct drm_dp_mst_port *parent) +{ + if (!mgr->mst_primary) + return false; + + port = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary, + port); + if (!port) + return false; + + if (!parent) + return true; + + parent = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary, + parent); + if (!parent) + return false; + + if (!parent->mstb) + return false; + + return drm_dp_mst_port_downstream_of_branch(port, parent->mstb); +} + +/** + * drm_dp_mst_port_downstream_of_parent - check if a port is downstream of a parent port + * @mgr: MST topology manager + * @port: the port being looked up + * @parent: the parent port + * + * The function returns %true if @port is downstream of @parent. If @parent is + * %NULL - denoting the root port - the function returns %true if @port is in + * @mgr's topology. + */ +bool +drm_dp_mst_port_downstream_of_parent(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + struct drm_dp_mst_port *parent) +{ + bool ret; + + mutex_lock(&mgr->lock); + ret = drm_dp_mst_port_downstream_of_parent_locked(mgr, port, parent); + mutex_unlock(&mgr->lock); + + return ret; +} +EXPORT_SYMBOL(drm_dp_mst_port_downstream_of_parent); + static int drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, - struct drm_dp_mst_topology_state *state); + struct drm_dp_mst_topology_state *state, + struct drm_dp_mst_port **failing_port); static int drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb, - struct drm_dp_mst_topology_state *state) + struct drm_dp_mst_topology_state *state, + struct drm_dp_mst_port **failing_port) { struct drm_dp_mst_atomic_payload *payload; struct drm_dp_mst_port *port; @@ -5062,7 +5287,7 @@ drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb, drm_dbg_atomic(mstb->mgr->dev, "[MSTB:%p] Checking bandwidth limits\n", mstb); list_for_each_entry(port, &mstb->ports, next) { - ret = drm_dp_mst_atomic_check_port_bw_limit(port, state); + ret = drm_dp_mst_atomic_check_port_bw_limit(port, state, failing_port); if (ret < 0) return ret; @@ -5074,7 +5299,8 @@ drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb, static int drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, - struct drm_dp_mst_topology_state *state) + struct drm_dp_mst_topology_state *state, + struct drm_dp_mst_port **failing_port) { struct drm_dp_mst_atomic_payload *payload; int pbn_used = 0; @@ -5095,13 +5321,15 @@ drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, drm_dbg_atomic(port->mgr->dev, "[MSTB:%p] [MST PORT:%p] no BW available for the port\n", port->parent, port); + *failing_port = port; return -EINVAL; } pbn_used = payload->pbn; } else { pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb, - state); + state, + failing_port); if (pbn_used <= 0) return pbn_used; } @@ -5110,6 +5338,7 @@ drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, drm_dbg_atomic(port->mgr->dev, "[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n", port->parent, port, pbn_used, port->full_pbn); + *failing_port = port; return -ENOSPC; } @@ -5162,10 +5391,10 @@ drm_dp_mst_atomic_check_payload_alloc_limits(struct drm_dp_mst_topology_mgr *mgr } if (!payload_count) - mst_state->pbn_div = 0; + mst_state->pbn_div.full = dfixed_const(0); drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p TU pbn_div=%d avail=%d used=%d\n", - mgr, mst_state, mst_state->pbn_div, avail_slots, + mgr, mst_state, dfixed_trunc(mst_state->pbn_div), avail_slots, mst_state->total_avail_slots - avail_slots); return 0; @@ -5288,24 +5517,87 @@ int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, EXPORT_SYMBOL(drm_dp_mst_atomic_enable_dsc); /** + * drm_dp_mst_atomic_check_mgr - Check the atomic state of an MST topology manager + * @state: The global atomic state + * @mgr: Manager to check + * @mst_state: The MST atomic state for @mgr + * @failing_port: Returns the port with a BW limitation + * + * Checks the given MST manager's topology state for an atomic update to ensure + * that it's valid. This includes checking whether there's enough bandwidth to + * support the new timeslot allocations in the atomic update. + * + * Any atomic drivers supporting DP MST must make sure to call this or + * the drm_dp_mst_atomic_check() function after checking the rest of their state + * in their &drm_mode_config_funcs.atomic_check() callback. + * + * See also: + * drm_dp_mst_atomic_check() + * drm_dp_atomic_find_time_slots() + * drm_dp_atomic_release_time_slots() + * + * Returns: + * - 0 if the new state is valid + * - %-ENOSPC, if the new state is invalid, because of BW limitation + * @failing_port is set to: + * + * - The non-root port where a BW limit check failed + * with all the ports downstream of @failing_port passing + * the BW limit check. + * The returned port pointer is valid until at least + * one payload downstream of it exists. + * - %NULL if the BW limit check failed at the root port + * with all the ports downstream of the root port passing + * the BW limit check. + * + * - %-EINVAL, if the new state is invalid, because the root port has + * too many payloads. + */ +int drm_dp_mst_atomic_check_mgr(struct drm_atomic_state *state, + struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_topology_state *mst_state, + struct drm_dp_mst_port **failing_port) +{ + int ret; + + *failing_port = NULL; + + if (!mgr->mst_state) + return 0; + + mutex_lock(&mgr->lock); + ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary, + mst_state, + failing_port); + mutex_unlock(&mgr->lock); + + if (ret < 0) + return ret; + + return drm_dp_mst_atomic_check_payload_alloc_limits(mgr, mst_state); +} +EXPORT_SYMBOL(drm_dp_mst_atomic_check_mgr); + +/** * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an * atomic update is valid * @state: Pointer to the new &struct drm_dp_mst_topology_state * * Checks the given topology state for an atomic update to ensure that it's - * valid. This includes checking whether there's enough bandwidth to support - * the new timeslot allocations in the atomic update. + * valid, calling drm_dp_mst_atomic_check_mgr() for all MST manager in the + * atomic state. This includes checking whether there's enough bandwidth to + * support the new timeslot allocations in the atomic update. * * Any atomic drivers supporting DP MST must make sure to call this after * checking the rest of their state in their * &drm_mode_config_funcs.atomic_check() callback. * * See also: + * drm_dp_mst_atomic_check_mgr() * drm_dp_atomic_find_time_slots() * drm_dp_atomic_release_time_slots() * * Returns: - * * 0 if the new state is valid, negative error code otherwise. */ int drm_dp_mst_atomic_check(struct drm_atomic_state *state) @@ -5315,21 +5607,11 @@ int drm_dp_mst_atomic_check(struct drm_atomic_state *state) int i, ret = 0; for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) { - if (!mgr->mst_state) - continue; + struct drm_dp_mst_port *tmp_port; - ret = drm_dp_mst_atomic_check_payload_alloc_limits(mgr, mst_state); + ret = drm_dp_mst_atomic_check_mgr(state, mgr, mst_state, &tmp_port); if (ret) break; - - mutex_lock(&mgr->lock); - ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary, - mst_state); - mutex_unlock(&mgr->lock); - if (ret < 0) - break; - else - ret = 0; } return ret; @@ -5352,7 +5634,6 @@ EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs); * topology object. * * RETURNS: - * * The MST topology state or error pointer. */ struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, @@ -5363,27 +5644,50 @@ struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_a EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); /** - * drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any + * drm_atomic_get_old_mst_topology_state: get old MST topology state in atomic state, if any * @state: global atomic state * @mgr: MST topology manager, also the private object in this case * - * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic + * This function wraps drm_atomic_get_old_private_obj_state() passing in the MST atomic * state vtable so that the private object state returned is that of a MST * topology object. * * Returns: + * The old MST topology state, or NULL if there's no topology state for this MST mgr + * in the global atomic state + */ +struct drm_dp_mst_topology_state * +drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state, + struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_private_state *old_priv_state = + drm_atomic_get_old_private_obj_state(state, &mgr->base); + + return old_priv_state ? to_dp_mst_topology_state(old_priv_state) : NULL; +} +EXPORT_SYMBOL(drm_atomic_get_old_mst_topology_state); + +/** + * drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any + * @state: global atomic state + * @mgr: MST topology manager, also the private object in this case + * + * This function wraps drm_atomic_get_new_private_obj_state() passing in the MST atomic + * state vtable so that the private object state returned is that of a MST + * topology object. * - * The MST topology state, or NULL if there's no topology state for this MST mgr + * Returns: + * The new MST topology state, or NULL if there's no topology state for this MST mgr * in the global atomic state */ struct drm_dp_mst_topology_state * drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr) { - struct drm_private_state *priv_state = + struct drm_private_state *new_priv_state = drm_atomic_get_new_private_obj_state(state, &mgr->base); - return priv_state ? to_dp_mst_topology_state(priv_state) : NULL; + return new_priv_state ? to_dp_mst_topology_state(new_priv_state) : NULL; } EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state); @@ -5669,13 +5973,12 @@ static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port) aux->ddc.algo_data = aux; aux->ddc.retries = 3; - aux->ddc.class = I2C_CLASS_DDC; aux->ddc.owner = THIS_MODULE; /* FIXME: set the kdev of the port's connector as parent */ aux->ddc.dev.parent = parent_dev; aux->ddc.dev.of_node = parent_dev->of_node; - strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev), + strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev), sizeof(aux->ddc.name)); return i2c_add_adapter(&aux->ddc); @@ -5714,7 +6017,7 @@ static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) return false; /* Virtual DP Sink (Internal Display Panel) */ - if (port->port_num >= 8) + if (drm_dp_mst_port_is_logical(port)) return true; /* DP-to-HDMI Protocol Converter */ @@ -5742,6 +6045,22 @@ static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) } /** + * drm_dp_mst_aux_for_parent() - Get the AUX device for an MST port's parent + * @port: MST port whose parent's AUX device is returned + * + * Return the AUX device for @port's parent or NULL if port's parent is the + * root port. + */ +struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port) +{ + if (!port->parent || !port->parent->port_parent) + return NULL; + + return &port->parent->port_parent->aux; +} +EXPORT_SYMBOL(drm_dp_mst_aux_for_parent); + +/** * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC * @port: The port to check. A leaf of the MST tree with an attached display. * @@ -5760,8 +6079,10 @@ static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) { struct drm_dp_mst_port *immediate_upstream_port; + struct drm_dp_aux *immediate_upstream_aux; struct drm_dp_mst_port *fec_port; struct drm_dp_desc desc = {}; + u8 upstream_dsc; u8 endpoint_fec; u8 endpoint_dsc; @@ -5788,16 +6109,14 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) /* DP-to-DP peer device */ if (drm_dp_mst_is_virtual_dpcd(immediate_upstream_port)) { - u8 upstream_dsc; - - if (drm_dp_dpcd_read(&port->aux, - DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1) + if (drm_dp_dpcd_read_data(&port->aux, + DP_DSC_SUPPORT, &endpoint_dsc, 1) < 0) return NULL; - if (drm_dp_dpcd_read(&port->aux, - DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1) + if (drm_dp_dpcd_read_data(&port->aux, + DP_FEC_CAPABILITY, &endpoint_fec, 1) < 0) return NULL; - if (drm_dp_dpcd_read(&immediate_upstream_port->aux, - DP_DSC_SUPPORT, &upstream_dsc, 1) != 1) + if (drm_dp_dpcd_read_data(&immediate_upstream_port->aux, + DP_DSC_SUPPORT, &upstream_dsc, 1) < 0) return NULL; /* Enpoint decompression with DP-to-DP peer device */ @@ -5824,21 +6143,32 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) * - Port is on primary branch device * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG) */ - if (drm_dp_read_desc(port->mgr->aux, &desc, true)) + if (immediate_upstream_port) + immediate_upstream_aux = &immediate_upstream_port->aux; + else + immediate_upstream_aux = port->mgr->aux; + + if (drm_dp_read_desc(immediate_upstream_aux, &desc, true)) return NULL; - if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) && - port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 && - port->parent == port->mgr->mst_primary) { + if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD)) { u8 dpcd_ext[DP_RECEIVER_CAP_SIZE]; - if (drm_dp_read_dpcd_caps(port->mgr->aux, dpcd_ext) < 0) + if (drm_dp_dpcd_read_data(immediate_upstream_aux, + DP_DSC_SUPPORT, &upstream_dsc, 1) < 0) + return NULL; + + if (!(upstream_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED)) + return NULL; + + if (drm_dp_read_dpcd_caps(immediate_upstream_aux, dpcd_ext) < 0) return NULL; - if ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) && + if (dpcd_ext[DP_DPCD_REV] >= DP_DPCD_REV_14 && + ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) && ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) - != DP_DWN_STRM_PORT_TYPE_ANALOG)) - return port->mgr->aux; + != DP_DWN_STRM_PORT_TYPE_ANALOG))) + return immediate_upstream_aux; } /* @@ -5847,11 +6177,11 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) * therefore the endpoint needs to be * both DSC and FEC capable. */ - if (drm_dp_dpcd_read(&port->aux, - DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1) + if (drm_dp_dpcd_read_data(&port->aux, + DP_DSC_SUPPORT, &endpoint_dsc, 1) < 0) return NULL; - if (drm_dp_dpcd_read(&port->aux, - DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1) + if (drm_dp_dpcd_read_data(&port->aux, + DP_FEC_CAPABILITY, &endpoint_fec, 1) < 0) return NULL; if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) && (endpoint_fec & DP_FEC_CAPABLE)) |