diff options
Diffstat (limited to 'drivers/gpu/drm/drm_dp_mst_topology.c')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 3277 |
1 files changed, 0 insertions, 3277 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c deleted file mode 100644 index ae5f06895562..000000000000 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ /dev/null @@ -1,3277 +0,0 @@ -/* - * Copyright © 2014 Red Hat - * - * Permission to use, copy, modify, distribute, and sell this software and its - * documentation for any purpose is hereby granted without fee, provided that - * the above copyright notice appear in all copies and that both that copyright - * notice and this permission notice appear in supporting documentation, and - * that the name of the copyright holders not be used in advertising or - * publicity pertaining to distribution of the software without specific, - * written prior permission. The copyright holders make no representations - * about the suitability of this software for any purpose. It is provided "as - * is" without express or implied warranty. - * - * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, - * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO - * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR - * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, - * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER - * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE - * OF THIS SOFTWARE. - */ - -#include <linux/kernel.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/seq_file.h> -#include <linux/i2c.h> -#include <drm/drm_dp_mst_helper.h> -#include <drm/drmP.h> - -#include <drm/drm_fixed.h> - -/** - * DOC: dp mst helper - * - * These functions contain parts of the DisplayPort 1.2a MultiStream Transport - * protocol. The helpers contain a topology manager and bandwidth manager. - * The helpers encapsulate the sending and received of sideband msgs. - */ -static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, - char *buf); -static int test_calc_pbn_mode(void); - -static void drm_dp_put_port(struct drm_dp_mst_port *port); - -static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, - int id, - struct drm_dp_payload *payload); - -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_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); - -static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); -static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); -static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); -/* sideband msg handling */ -static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) -{ - u8 bitmask = 0x80; - u8 bitshift = 7; - u8 array_index = 0; - int number_of_bits = num_nibbles * 4; - u8 remainder = 0; - - while (number_of_bits != 0) { - number_of_bits--; - remainder <<= 1; - remainder |= (data[array_index] & bitmask) >> bitshift; - bitmask >>= 1; - bitshift--; - if (bitmask == 0) { - bitmask = 0x80; - bitshift = 7; - array_index++; - } - if ((remainder & 0x10) == 0x10) - remainder ^= 0x13; - } - - number_of_bits = 4; - while (number_of_bits != 0) { - number_of_bits--; - remainder <<= 1; - if ((remainder & 0x10) != 0) - remainder ^= 0x13; - } - - return remainder; -} - -static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) -{ - u8 bitmask = 0x80; - u8 bitshift = 7; - u8 array_index = 0; - int number_of_bits = number_of_bytes * 8; - u16 remainder = 0; - - while (number_of_bits != 0) { - number_of_bits--; - remainder <<= 1; - remainder |= (data[array_index] & bitmask) >> bitshift; - bitmask >>= 1; - bitshift--; - if (bitmask == 0) { - bitmask = 0x80; - bitshift = 7; - array_index++; - } - if ((remainder & 0x100) == 0x100) - remainder ^= 0xd5; - } - - number_of_bits = 8; - while (number_of_bits != 0) { - number_of_bits--; - remainder <<= 1; - if ((remainder & 0x100) != 0) - remainder ^= 0xd5; - } - - return remainder & 0xff; -} -static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) -{ - u8 size = 3; - size += (hdr->lct / 2); - return size; -} - -static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, - u8 *buf, int *len) -{ - int idx = 0; - int i; - u8 crc4; - buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); - for (i = 0; i < (hdr->lct / 2); i++) - buf[idx++] = hdr->rad[i]; - buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | - (hdr->msg_len & 0x3f); - buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); - - crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); - buf[idx - 1] |= (crc4 & 0xf); - - *len = idx; -} - -static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, - u8 *buf, int buflen, u8 *hdrlen) -{ - u8 crc4; - u8 len; - int i; - u8 idx; - if (buf[0] == 0) - return false; - len = 3; - len += ((buf[0] & 0xf0) >> 4) / 2; - if (len > buflen) - return false; - crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); - - if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { - DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); - return false; - } - - hdr->lct = (buf[0] & 0xf0) >> 4; - hdr->lcr = (buf[0] & 0xf); - idx = 1; - for (i = 0; i < (hdr->lct / 2); i++) - hdr->rad[i] = buf[idx++]; - hdr->broadcast = (buf[idx] >> 7) & 0x1; - hdr->path_msg = (buf[idx] >> 6) & 0x1; - hdr->msg_len = buf[idx] & 0x3f; - idx++; - hdr->somt = (buf[idx] >> 7) & 0x1; - hdr->eomt = (buf[idx] >> 6) & 0x1; - hdr->seqno = (buf[idx] >> 4) & 0x1; - idx++; - *hdrlen = idx; - return true; -} - -static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, - struct drm_dp_sideband_msg_tx *raw) -{ - int idx = 0; - int i; - u8 *buf = raw->msg; - buf[idx++] = req->req_type & 0x7f; - - switch (req->req_type) { - case DP_ENUM_PATH_RESOURCES: - buf[idx] = (req->u.port_num.port_number & 0xf) << 4; - idx++; - break; - case DP_ALLOCATE_PAYLOAD: - buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | - (req->u.allocate_payload.number_sdp_streams & 0xf); - idx++; - buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); - idx++; - buf[idx] = (req->u.allocate_payload.pbn >> 8); - idx++; - buf[idx] = (req->u.allocate_payload.pbn & 0xff); - idx++; - for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { - buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | - (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); - idx++; - } - if (req->u.allocate_payload.number_sdp_streams & 1) { - i = req->u.allocate_payload.number_sdp_streams - 1; - buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; - idx++; - } - break; - case DP_QUERY_PAYLOAD: - buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; - idx++; - buf[idx] = (req->u.query_payload.vcpi & 0x7f); - idx++; - break; - case DP_REMOTE_DPCD_READ: - buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; - buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; - idx++; - buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; - idx++; - buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); - idx++; - buf[idx] = (req->u.dpcd_read.num_bytes); - idx++; - break; - - case DP_REMOTE_DPCD_WRITE: - buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; - buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; - idx++; - buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; - idx++; - buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); - idx++; - buf[idx] = (req->u.dpcd_write.num_bytes); - idx++; - memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); - idx += req->u.dpcd_write.num_bytes; - break; - case DP_REMOTE_I2C_READ: - buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; - buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); - idx++; - for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { - buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; - idx++; - buf[idx] = req->u.i2c_read.transactions[i].num_bytes; - idx++; - memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); - idx += req->u.i2c_read.transactions[i].num_bytes; - - buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; - buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); - idx++; - } - buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; - idx++; - buf[idx] = (req->u.i2c_read.num_bytes_read); - idx++; - break; - - case DP_REMOTE_I2C_WRITE: - buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; - idx++; - buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; - idx++; - buf[idx] = (req->u.i2c_write.num_bytes); - idx++; - memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); - idx += req->u.i2c_write.num_bytes; - break; - } - raw->cur_len = idx; -} - -static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) -{ - u8 crc4; - crc4 = drm_dp_msg_data_crc4(msg, len); - msg[len] = crc4; -} - -static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, - struct drm_dp_sideband_msg_tx *raw) -{ - int idx = 0; - u8 *buf = raw->msg; - - buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); - - raw->cur_len = idx; -} - -/* this adds a chunk of msg to the builder to get the final msg */ -static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, - u8 *replybuf, u8 replybuflen, bool hdr) -{ - int ret; - u8 crc4; - - if (hdr) { - u8 hdrlen; - struct drm_dp_sideband_msg_hdr recv_hdr; - ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); - if (ret == false) { - print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); - return false; - } - - /* - * ignore out-of-order messages or messages that are part of a - * failed transaction - */ - if (!recv_hdr.somt && !msg->have_somt) - return false; - - /* get length contained in this portion */ - msg->curchunk_len = recv_hdr.msg_len; - msg->curchunk_hdrlen = hdrlen; - - /* we have already gotten an somt - don't bother parsing */ - if (recv_hdr.somt && msg->have_somt) - return false; - - if (recv_hdr.somt) { - memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); - msg->have_somt = true; - } - if (recv_hdr.eomt) - msg->have_eomt = true; - - /* copy the bytes for the remainder of this header chunk */ - msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); - memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); - } else { - memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); - msg->curchunk_idx += replybuflen; - } - - if (msg->curchunk_idx >= msg->curchunk_len) { - /* do CRC */ - crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); - /* copy chunk into bigger msg */ - memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); - msg->curlen += msg->curchunk_len - 1; - } - return true; -} - -static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - int i; - memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); - idx += 16; - repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; - idx++; - if (idx > raw->curlen) - goto fail_len; - for (i = 0; i < repmsg->u.link_addr.nports; i++) { - if (raw->msg[idx] & 0x80) - repmsg->u.link_addr.ports[i].input_port = 1; - - repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; - repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); - - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; - repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; - if (repmsg->u.link_addr.ports[i].input_port == 0) - repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; - idx++; - if (idx > raw->curlen) - goto fail_len; - if (repmsg->u.link_addr.ports[i].input_port == 0) { - repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); - idx++; - if (idx > raw->curlen) - goto fail_len; - memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); - idx += 16; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; - repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); - idx++; - - } - if (idx > raw->curlen) - goto fail_len; - } - - return true; -fail_len: - DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; - if (idx > raw->curlen) - goto fail_len; - - memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); - return true; -fail_len: - DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; - idx++; - if (idx > raw->curlen) - goto fail_len; - return true; -fail_len: - DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - - repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; - idx++; - /* TODO check */ - memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); - return true; -fail_len: - DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); - idx += 2; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); - idx += 2; - if (idx > raw->curlen) - goto fail_len; - return true; -fail_len: - DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.allocate_payload.vcpi = raw->msg[idx]; - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); - idx += 2; - if (idx > raw->curlen) - goto fail_len; - return true; -fail_len: - DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *repmsg) -{ - int idx = 1; - repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; - idx++; - if (idx > raw->curlen) - goto fail_len; - repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); - idx += 2; - if (idx > raw->curlen) - goto fail_len; - return true; -fail_len: - DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_reply_body *msg) -{ - memset(msg, 0, sizeof(*msg)); - msg->reply_type = (raw->msg[0] & 0x80) >> 7; - msg->req_type = (raw->msg[0] & 0x7f); - - if (msg->reply_type) { - memcpy(msg->u.nak.guid, &raw->msg[1], 16); - msg->u.nak.reason = raw->msg[17]; - msg->u.nak.nak_data = raw->msg[18]; - return false; - } - - switch (msg->req_type) { - case DP_LINK_ADDRESS: - return drm_dp_sideband_parse_link_address(raw, msg); - case DP_QUERY_PAYLOAD: - return drm_dp_sideband_parse_query_payload_ack(raw, msg); - case DP_REMOTE_DPCD_READ: - return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); - case DP_REMOTE_DPCD_WRITE: - return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); - case DP_REMOTE_I2C_READ: - return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); - case DP_ENUM_PATH_RESOURCES: - return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); - case DP_ALLOCATE_PAYLOAD: - return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); - default: - DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); - return false; - } -} - -static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_req_body *msg) -{ - int idx = 1; - - msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; - idx++; - if (idx > raw->curlen) - goto fail_len; - - memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); - idx += 16; - if (idx > raw->curlen) - goto fail_len; - - msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; - msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; - msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; - msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; - msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); - idx++; - return true; -fail_len: - DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_req_body *msg) -{ - int idx = 1; - - msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; - idx++; - if (idx > raw->curlen) - goto fail_len; - - memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); - idx += 16; - if (idx > raw->curlen) - goto fail_len; - - msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); - idx++; - return true; -fail_len: - DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); - return false; -} - -static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_req_body *msg) -{ - memset(msg, 0, sizeof(*msg)); - msg->req_type = (raw->msg[0] & 0x7f); - - switch (msg->req_type) { - case DP_CONNECTION_STATUS_NOTIFY: - return drm_dp_sideband_parse_connection_status_notify(raw, msg); - case DP_RESOURCE_STATUS_NOTIFY: - return drm_dp_sideband_parse_resource_status_notify(raw, msg); - default: - DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); - return false; - } -} - -static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) -{ - struct drm_dp_sideband_msg_req_body req; - - req.req_type = DP_REMOTE_DPCD_WRITE; - req.u.dpcd_write.port_number = port_num; - req.u.dpcd_write.dpcd_address = offset; - req.u.dpcd_write.num_bytes = num_bytes; - req.u.dpcd_write.bytes = bytes; - drm_dp_encode_sideband_req(&req, msg); - - return 0; -} - -static int build_link_address(struct drm_dp_sideband_msg_tx *msg) -{ - struct drm_dp_sideband_msg_req_body req; - - req.req_type = DP_LINK_ADDRESS; - drm_dp_encode_sideband_req(&req, msg); - return 0; -} - -static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) -{ - struct drm_dp_sideband_msg_req_body req; - - req.req_type = DP_ENUM_PATH_RESOURCES; - req.u.port_num.port_number = port_num; - drm_dp_encode_sideband_req(&req, msg); - msg->path_msg = true; - return 0; -} - -static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, - u8 vcpi, uint16_t pbn, - u8 number_sdp_streams, - u8 *sdp_stream_sink) -{ - struct drm_dp_sideband_msg_req_body req; - memset(&req, 0, sizeof(req)); - req.req_type = DP_ALLOCATE_PAYLOAD; - req.u.allocate_payload.port_number = port_num; - req.u.allocate_payload.vcpi = vcpi; - req.u.allocate_payload.pbn = pbn; - req.u.allocate_payload.number_sdp_streams = number_sdp_streams; - memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, - number_sdp_streams); - drm_dp_encode_sideband_req(&req, msg); - msg->path_msg = true; - return 0; -} - -static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_vcpi *vcpi) -{ - int ret, vcpi_ret; - - mutex_lock(&mgr->payload_lock); - ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); - if (ret > mgr->max_payloads) { - ret = -EINVAL; - DRM_DEBUG_KMS("out of payload ids %d\n", ret); - goto out_unlock; - } - - vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); - if (vcpi_ret > mgr->max_payloads) { - ret = -EINVAL; - DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); - goto out_unlock; - } - - set_bit(ret, &mgr->payload_mask); - set_bit(vcpi_ret, &mgr->vcpi_mask); - vcpi->vcpi = vcpi_ret + 1; - mgr->proposed_vcpis[ret - 1] = vcpi; -out_unlock: - mutex_unlock(&mgr->payload_lock); - return ret; -} - -static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, - int vcpi) -{ - int i; - if (vcpi == 0) - return; - - mutex_lock(&mgr->payload_lock); - DRM_DEBUG_KMS("putting payload %d\n", vcpi); - clear_bit(vcpi - 1, &mgr->vcpi_mask); - - for (i = 0; i < mgr->max_payloads; i++) { - if (mgr->proposed_vcpis[i]) - if (mgr->proposed_vcpis[i]->vcpi == vcpi) { - mgr->proposed_vcpis[i] = NULL; - clear_bit(i + 1, &mgr->payload_mask); - } - } - mutex_unlock(&mgr->payload_lock); -} - -static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_sideband_msg_tx *txmsg) -{ - unsigned int state; - - /* - * All updates to txmsg->state are protected by mgr->qlock, and the two - * cases we check here are terminal states. For those the barriers - * provided by the wake_up/wait_event pair are enough. - */ - state = READ_ONCE(txmsg->state); - return (state == DRM_DP_SIDEBAND_TX_RX || - state == DRM_DP_SIDEBAND_TX_TIMEOUT); -} - -static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, - struct drm_dp_sideband_msg_tx *txmsg) -{ - struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; - int ret; - - ret = wait_event_timeout(mgr->tx_waitq, - check_txmsg_state(mgr, txmsg), - (4 * HZ)); - mutex_lock(&mstb->mgr->qlock); - if (ret > 0) { - if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { - ret = -EIO; - goto out; - } - } else { - DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); - - /* dump some state */ - ret = -EIO; - - /* remove from q */ - if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || - txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { - list_del(&txmsg->next); - } - - if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || - txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { - mstb->tx_slots[txmsg->seqno] = NULL; - } - } -out: - mutex_unlock(&mgr->qlock); - - return ret; -} - -static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) -{ - struct drm_dp_mst_branch *mstb; - - mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); - if (!mstb) - return NULL; - - mstb->lct = lct; - if (lct > 1) - memcpy(mstb->rad, rad, lct / 2); - INIT_LIST_HEAD(&mstb->ports); - kref_init(&mstb->kref); - return mstb; -} - -static void drm_dp_free_mst_port(struct kref *kref); - -static void drm_dp_free_mst_branch_device(struct kref *kref) -{ - struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); - if (mstb->port_parent) { - if (list_empty(&mstb->port_parent->next)) - kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); - } - kfree(mstb); -} - -static void drm_dp_destroy_mst_branch_device(struct kref *kref) -{ - struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); - struct drm_dp_mst_port *port, *tmp; - bool wake_tx = false; - - /* - * init kref again to be used by ports to remove mst branch when it is - * not needed anymore - */ - kref_init(kref); - - if (mstb->port_parent && list_empty(&mstb->port_parent->next)) - kref_get(&mstb->port_parent->kref); - - /* - * destroy all ports - don't need lock - * as there are no more references to the mst branch - * device at this point. - */ - list_for_each_entry_safe(port, tmp, &mstb->ports, next) { - list_del(&port->next); - drm_dp_put_port(port); - } - - /* drop any tx slots msg */ - mutex_lock(&mstb->mgr->qlock); - if (mstb->tx_slots[0]) { - mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; - mstb->tx_slots[0] = NULL; - wake_tx = true; - } - if (mstb->tx_slots[1]) { - mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; - mstb->tx_slots[1] = NULL; - wake_tx = true; - } - mutex_unlock(&mstb->mgr->qlock); - - if (wake_tx) - wake_up_all(&mstb->mgr->tx_waitq); - - kref_put(kref, drm_dp_free_mst_branch_device); -} - -static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) -{ - kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); -} - - -static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) -{ - struct drm_dp_mst_branch *mstb; - - switch (old_pdt) { - case DP_PEER_DEVICE_DP_LEGACY_CONV: - case DP_PEER_DEVICE_SST_SINK: - /* remove i2c over sideband */ - drm_dp_mst_unregister_i2c_bus(&port->aux); - break; - case DP_PEER_DEVICE_MST_BRANCHING: - mstb = port->mstb; - port->mstb = NULL; - drm_dp_put_mst_branch_device(mstb); - break; - } -} - -static void drm_dp_destroy_port(struct kref *kref) -{ - struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); - struct drm_dp_mst_topology_mgr *mgr = port->mgr; - - if (!port->input) { - port->vcpi.num_slots = 0; - - kfree(port->cached_edid); - - /* - * The only time we don't have a connector - * on an output port is if the connector init - * fails. - */ - if (port->connector) { - /* we can't destroy the connector here, as - * we might be holding the mode_config.mutex - * from an EDID retrieval */ - - mutex_lock(&mgr->destroy_connector_lock); - kref_get(&port->parent->kref); - list_add(&port->next, &mgr->destroy_connector_list); - mutex_unlock(&mgr->destroy_connector_lock); - schedule_work(&mgr->destroy_connector_work); - return; - } - /* no need to clean up vcpi - * as if we have no connector we never setup a vcpi */ - drm_dp_port_teardown_pdt(port, port->pdt); - port->pdt = DP_PEER_DEVICE_NONE; - } - kfree(port); -} - -static void drm_dp_put_port(struct drm_dp_mst_port *port) -{ - kref_put(&port->kref, drm_dp_destroy_port); -} - -static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find) -{ - struct drm_dp_mst_port *port; - struct drm_dp_mst_branch *rmstb; - if (to_find == mstb) { - kref_get(&mstb->kref); - return mstb; - } - list_for_each_entry(port, &mstb->ports, next) { - if (port->mstb) { - rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); - if (rmstb) - return rmstb; - } - } - return NULL; -} - -static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) -{ - struct drm_dp_mst_branch *rmstb = NULL; - mutex_lock(&mgr->lock); - if (mgr->mst_primary) - rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); - mutex_unlock(&mgr->lock); - return rmstb; -} - -static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) -{ - struct drm_dp_mst_port *port, *mport; - - list_for_each_entry(port, &mstb->ports, next) { - if (port == to_find) { - kref_get(&port->kref); - return port; - } - if (port->mstb) { - mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); - if (mport) - return mport; - } - } - return NULL; -} - -static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) -{ - struct drm_dp_mst_port *rport = NULL; - mutex_lock(&mgr->lock); - if (mgr->mst_primary) - rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); - mutex_unlock(&mgr->lock); - return rport; -} - -static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) -{ - struct drm_dp_mst_port *port; - - list_for_each_entry(port, &mstb->ports, next) { - if (port->port_num == port_num) { - kref_get(&port->kref); - return port; - } - } - - return NULL; -} - -/* - * calculate a new RAD for this MST branch device - * if parent has an LCT of 2 then it has 1 nibble of RAD, - * if parent has an LCT of 3 then it has 2 nibbles of RAD, - */ -static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, - u8 *rad) -{ - int parent_lct = port->parent->lct; - int shift = 4; - int idx = (parent_lct - 1) / 2; - if (parent_lct > 1) { - memcpy(rad, port->parent->rad, idx + 1); - shift = (parent_lct % 2) ? 4 : 0; - } else - rad[0] = 0; - - rad[idx] |= port->port_num << shift; - return parent_lct + 1; -} - -/* - * return sends link address for new mstb - */ -static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) -{ - int ret; - u8 rad[6], lct; - bool send_link = false; - switch (port->pdt) { - case DP_PEER_DEVICE_DP_LEGACY_CONV: - case DP_PEER_DEVICE_SST_SINK: - /* add i2c over sideband */ - ret = drm_dp_mst_register_i2c_bus(&port->aux); - break; - case DP_PEER_DEVICE_MST_BRANCHING: - lct = drm_dp_calculate_rad(port, rad); - - port->mstb = drm_dp_add_mst_branch_device(lct, rad); - port->mstb->mgr = port->mgr; - port->mstb->port_parent = port; - - send_link = true; - break; - } - return send_link; -} - -static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) -{ - int ret; - - memcpy(mstb->guid, guid, 16); - - 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); - } - } -} - -static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, - int pnum, - char *proppath, - size_t proppath_size) -{ - int i; - char temp[8]; - snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); - for (i = 0; i < (mstb->lct - 1); i++) { - int shift = (i % 2) ? 0 : 4; - int port_num = (mstb->rad[i / 2] >> shift) & 0xf; - snprintf(temp, sizeof(temp), "-%d", port_num); - strlcat(proppath, temp, proppath_size); - } - snprintf(temp, sizeof(temp), "-%d", pnum); - strlcat(proppath, temp, proppath_size); -} - -static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, - struct drm_device *dev, - struct drm_dp_link_addr_reply_port *port_msg) -{ - struct drm_dp_mst_port *port; - bool ret; - bool created = false; - int old_pdt = 0; - int old_ddps = 0; - port = drm_dp_get_port(mstb, port_msg->port_number); - if (!port) { - port = kzalloc(sizeof(*port), GFP_KERNEL); - if (!port) - return; - kref_init(&port->kref); - port->parent = mstb; - port->port_num = port_msg->port_number; - port->mgr = mstb->mgr; - port->aux.name = "DPMST"; - port->aux.dev = dev->dev; - created = true; - } else { - old_pdt = port->pdt; - old_ddps = port->ddps; - } - - port->pdt = port_msg->peer_device_type; - port->input = port_msg->input_port; - port->mcs = port_msg->mcs; - port->ddps = port_msg->ddps; - port->ldps = port_msg->legacy_device_plug_status; - port->dpcd_rev = port_msg->dpcd_revision; - port->num_sdp_streams = port_msg->num_sdp_streams; - port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; - - /* manage mstb port lists with mgr lock - take a reference - for this list */ - if (created) { - mutex_lock(&mstb->mgr->lock); - kref_get(&port->kref); - list_add(&port->next, &mstb->ports); - mutex_unlock(&mstb->mgr->lock); - } - - if (old_ddps != port->ddps) { - if (port->ddps) { - if (!port->input) - drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); - } else { - port->available_pbn = 0; - } - } - - if (old_pdt != port->pdt && !port->input) { - drm_dp_port_teardown_pdt(port, old_pdt); - - ret = drm_dp_port_setup_pdt(port); - if (ret == true) - drm_dp_send_link_address(mstb->mgr, port->mstb); - } - - if (created && !port->input) { - char proppath[255]; - - build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); - port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); - if (!port->connector) { - /* remove it from the port list */ - mutex_lock(&mstb->mgr->lock); - list_del(&port->next); - mutex_unlock(&mstb->mgr->lock); - /* drop port list reference */ - drm_dp_put_port(port); - goto out; - } - if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || - port->pdt == DP_PEER_DEVICE_SST_SINK) && - port->port_num >= DP_MST_LOGICAL_PORT_0) { - port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); - drm_mode_connector_set_tile_property(port->connector); - } - (*mstb->mgr->cbs->register_connector)(port->connector); - } - -out: - /* put reference to this port */ - drm_dp_put_port(port); -} - -static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, - struct drm_dp_connection_status_notify *conn_stat) -{ - struct drm_dp_mst_port *port; - int old_pdt; - int old_ddps; - bool dowork = false; - port = drm_dp_get_port(mstb, conn_stat->port_number); - if (!port) - return; - - old_ddps = port->ddps; - old_pdt = port->pdt; - port->pdt = conn_stat->peer_device_type; - port->mcs = conn_stat->message_capability_status; - port->ldps = conn_stat->legacy_device_plug_status; - port->ddps = conn_stat->displayport_device_plug_status; - - if (old_ddps != port->ddps) { - if (port->ddps) { - dowork = true; - } else { - port->available_pbn = 0; - } - } - if (old_pdt != port->pdt && !port->input) { - drm_dp_port_teardown_pdt(port, old_pdt); - - if (drm_dp_port_setup_pdt(port)) - dowork = true; - } - - drm_dp_put_port(port); - if (dowork) - queue_work(system_long_wq, &mstb->mgr->work); - -} - -static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, - u8 lct, u8 *rad) -{ - struct drm_dp_mst_branch *mstb; - struct drm_dp_mst_port *port; - int i; - /* find the port by iterating down */ - - mutex_lock(&mgr->lock); - mstb = mgr->mst_primary; - - for (i = 0; i < lct - 1; i++) { - int shift = (i % 2) ? 0 : 4; - int port_num = (rad[i / 2] >> shift) & 0xf; - - list_for_each_entry(port, &mstb->ports, next) { - if (port->port_num == port_num) { - mstb = port->mstb; - if (!mstb) { - DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); - goto out; - } - - break; - } - } - } - kref_get(&mstb->kref); -out: - mutex_unlock(&mgr->lock); - return mstb; -} - -static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( - struct drm_dp_mst_branch *mstb, - uint8_t *guid) -{ - struct drm_dp_mst_branch *found_mstb; - struct drm_dp_mst_port *port; - - if (memcmp(mstb->guid, guid, 16) == 0) - 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) - return found_mstb; - } - - return NULL; -} - -static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( - struct drm_dp_mst_topology_mgr *mgr, - uint8_t *guid) -{ - struct drm_dp_mst_branch *mstb; - - /* find the port by iterating down */ - mutex_lock(&mgr->lock); - - mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); - - if (mstb) - kref_get(&mstb->kref); - - mutex_unlock(&mgr->lock); - return mstb; -} - -static void 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; - struct drm_dp_mst_branch *mstb_child; - if (!mstb->link_address_sent) - drm_dp_send_link_address(mgr, mstb); - - list_for_each_entry(port, &mstb->ports, next) { - if (port->input) - continue; - - if (!port->ddps) - continue; - - if (!port->available_pbn) - drm_dp_send_enum_path_resources(mgr, mstb, port); - - if (port->mstb) { - mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); - if (mstb_child) { - drm_dp_check_and_send_link_address(mgr, mstb_child); - drm_dp_put_mst_branch_device(mstb_child); - } - } - } -} - -static void drm_dp_mst_link_probe_work(struct work_struct *work) -{ - struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); - struct drm_dp_mst_branch *mstb; - - mutex_lock(&mgr->lock); - mstb = mgr->mst_primary; - if (mstb) { - kref_get(&mstb->kref); - } - mutex_unlock(&mgr->lock); - if (mstb) { - drm_dp_check_and_send_link_address(mgr, mstb); - drm_dp_put_mst_branch_device(mstb); - } -} - -static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, - u8 *guid) -{ - static u8 zero_guid[16]; - - if (!memcmp(guid, zero_guid, 16)) { - u64 salt = get_jiffies_64(); - memcpy(&guid[0], &salt, sizeof(u64)); - memcpy(&guid[8], &salt, sizeof(u64)); - return false; - } - return true; -} - -#if 0 -static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) -{ - struct drm_dp_sideband_msg_req_body req; - - req.req_type = DP_REMOTE_DPCD_READ; - req.u.dpcd_read.port_number = port_num; - req.u.dpcd_read.dpcd_address = offset; - req.u.dpcd_read.num_bytes = num_bytes; - drm_dp_encode_sideband_req(&req, msg); - - return 0; -} -#endif - -static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, - bool up, u8 *msg, int len) -{ - int ret; - int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; - int tosend, total, offset; - int retries = 0; - -retry: - total = len; - offset = 0; - 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; - } - DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); - - return -EIO; - } - offset += tosend; - total -= tosend; - } while (total > 0); - return 0; -} - -static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, - struct drm_dp_sideband_msg_tx *txmsg) -{ - struct drm_dp_mst_branch *mstb = txmsg->dst; - u8 req_type; - - /* both msg slots are full */ - if (txmsg->seqno == -1) { - if (mstb->tx_slots[0] && mstb->tx_slots[1]) { - DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); - return -EAGAIN; - } - if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { - txmsg->seqno = mstb->last_seqno; - mstb->last_seqno ^= 1; - } else if (mstb->tx_slots[0] == NULL) - txmsg->seqno = 0; - else - txmsg->seqno = 1; - mstb->tx_slots[txmsg->seqno] = txmsg; - } - - req_type = txmsg->msg[0] & 0x7f; - if (req_type == DP_CONNECTION_STATUS_NOTIFY || - req_type == DP_RESOURCE_STATUS_NOTIFY) - hdr->broadcast = 1; - else - hdr->broadcast = 0; - hdr->path_msg = txmsg->path_msg; - hdr->lct = mstb->lct; - hdr->lcr = mstb->lct - 1; - if (mstb->lct > 1) - memcpy(hdr->rad, mstb->rad, mstb->lct / 2); - hdr->seqno = txmsg->seqno; - return 0; -} -/* - * process a single block of the next message in the sideband queue - */ -static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_sideband_msg_tx *txmsg, - bool up) -{ - u8 chunk[48]; - struct drm_dp_sideband_msg_hdr hdr; - int len, space, idx, tosend; - int ret; - - memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); - - if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { - txmsg->seqno = -1; - txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; - } - - /* make hdr from dst mst - for replies use seqno - otherwise assign one */ - ret = set_hdr_from_dst_qlock(&hdr, txmsg); - if (ret < 0) - return ret; - - /* amount left to send in this message */ - len = txmsg->cur_len - txmsg->cur_offset; - - /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ - space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); - - tosend = min(len, space); - if (len == txmsg->cur_len) - hdr.somt = 1; - if (space >= len) - hdr.eomt = 1; - - - hdr.msg_len = tosend + 1; - drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); - memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); - /* add crc at end */ - drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); - idx += tosend + 1; - - ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); - if (ret) { - DRM_DEBUG_KMS("sideband msg failed to send\n"); - return ret; - } - - txmsg->cur_offset += tosend; - if (txmsg->cur_offset == txmsg->cur_len) { - txmsg->state = DRM_DP_SIDEBAND_TX_SENT; - return 1; - } - return 0; -} - -static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) -{ - struct drm_dp_sideband_msg_tx *txmsg; - int ret; - - WARN_ON(!mutex_is_locked(&mgr->qlock)); - - /* construct a chunk from the first msg in the tx_msg queue */ - if (list_empty(&mgr->tx_msg_downq)) - return; - - txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); - ret = process_single_tx_qlock(mgr, txmsg, false); - if (ret == 1) { - /* txmsg is sent it should be in the slots now */ - list_del(&txmsg->next); - } else if (ret) { - DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); - list_del(&txmsg->next); - if (txmsg->seqno != -1) - txmsg->dst->tx_slots[txmsg->seqno] = NULL; - txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; - wake_up_all(&mgr->tx_waitq); - } -} - -/* called holding qlock */ -static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_sideband_msg_tx *txmsg) -{ - int ret; - - /* construct a chunk from the first msg in the tx_msg queue */ - ret = process_single_tx_qlock(mgr, txmsg, true); - - if (ret != 1) - DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); - - txmsg->dst->tx_slots[txmsg->seqno] = NULL; -} - -static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_sideband_msg_tx *txmsg) -{ - mutex_lock(&mgr->qlock); - list_add_tail(&txmsg->next, &mgr->tx_msg_downq); - if (list_is_singular(&mgr->tx_msg_downq)) - process_single_down_tx_qlock(mgr); - mutex_unlock(&mgr->qlock); -} - -static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_branch *mstb) -{ - int len; - struct drm_dp_sideband_msg_tx *txmsg; - int ret; - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) - return; - - txmsg->dst = mstb; - len = build_link_address(txmsg); - - mstb->link_address_sent = true; - drm_dp_queue_down_tx(mgr, txmsg); - - ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret > 0) { - int i; - - if (txmsg->reply.reply_type == 1) - DRM_DEBUG_KMS("link address nak received\n"); - else { - DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); - for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { - DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, - txmsg->reply.u.link_addr.ports[i].input_port, - txmsg->reply.u.link_addr.ports[i].peer_device_type, - txmsg->reply.u.link_addr.ports[i].port_number, - txmsg->reply.u.link_addr.ports[i].dpcd_revision, - txmsg->reply.u.link_addr.ports[i].mcs, - txmsg->reply.u.link_addr.ports[i].ddps, - txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, - txmsg->reply.u.link_addr.ports[i].num_sdp_streams, - txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); - } - - drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); - - for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { - drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); - } - (*mgr->cbs->hotplug)(mgr); - } - } else { - mstb->link_address_sent = false; - DRM_DEBUG_KMS("link address failed %d\n", ret); - } - - kfree(txmsg); -} - -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) -{ - int len; - struct drm_dp_sideband_msg_tx *txmsg; - int ret; - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) - return -ENOMEM; - - txmsg->dst = mstb; - len = build_enum_path_resources(txmsg, port->port_num); - - drm_dp_queue_down_tx(mgr, txmsg); - - ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret > 0) { - if (txmsg->reply.reply_type == 1) - DRM_DEBUG_KMS("enum path resources nak received\n"); - else { - if (port->port_num != txmsg->reply.u.path_resources.port_number) - DRM_ERROR("got incorrect port in response\n"); - DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, - txmsg->reply.u.path_resources.avail_payload_bw_number); - port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; - } - } - - kfree(txmsg); - return 0; -} - -static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) -{ - if (!mstb->port_parent) - return NULL; - - if (mstb->port_parent->mstb != mstb) - return mstb->port_parent; - - return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); -} - -static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_branch *mstb, - int *port_num) -{ - struct drm_dp_mst_branch *rmstb = NULL; - struct drm_dp_mst_port *found_port; - mutex_lock(&mgr->lock); - if (mgr->mst_primary) { - found_port = drm_dp_get_last_connected_port_to_mstb(mstb); - - if (found_port) { - rmstb = found_port->parent; - kref_get(&rmstb->kref); - *port_num = found_port->port_num; - } - } - mutex_unlock(&mgr->lock); - return rmstb; -} - -static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, - int id, - int pbn) -{ - struct drm_dp_sideband_msg_tx *txmsg; - struct drm_dp_mst_branch *mstb; - int len, ret, port_num; - u8 sinks[DRM_DP_MAX_SDP_STREAMS]; - int i; - - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return -EINVAL; - - port_num = port->port_num; - mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); - if (!mstb) { - mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); - - if (!mstb) { - drm_dp_put_port(port); - return -EINVAL; - } - } - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) { - ret = -ENOMEM; - goto fail_put; - } - - for (i = 0; i < port->num_sdp_streams; i++) - sinks[i] = i; - - txmsg->dst = mstb; - len = build_allocate_payload(txmsg, port_num, - id, - pbn, port->num_sdp_streams, sinks); - - drm_dp_queue_down_tx(mgr, txmsg); - - ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret > 0) { - if (txmsg->reply.reply_type == 1) { - ret = -EINVAL; - } else - ret = 0; - } - kfree(txmsg); -fail_put: - drm_dp_put_mst_branch_device(mstb); - drm_dp_put_port(port); - return ret; -} - -static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, - int id, - struct drm_dp_payload *payload) -{ - int ret; - - ret = drm_dp_dpcd_write_payload(mgr, id, payload); - if (ret < 0) { - payload->payload_state = 0; - return ret; - } - payload->payload_state = DP_PAYLOAD_LOCAL; - return 0; -} - -static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, - int id, - struct drm_dp_payload *payload) -{ - int ret; - ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); - if (ret < 0) - return ret; - payload->payload_state = DP_PAYLOAD_REMOTE; - return ret; -} - -static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, - int id, - struct drm_dp_payload *payload) -{ - DRM_DEBUG_KMS("\n"); - /* its okay for these to fail */ - if (port) { - drm_dp_payload_send_msg(mgr, port, id, 0); - } - - drm_dp_dpcd_write_payload(mgr, id, payload); - payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; - return 0; -} - -static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, - int id, - struct drm_dp_payload *payload) -{ - payload->payload_state = 0; - return 0; -} - -/** - * drm_dp_update_payload_part1() - Execute payload update part 1 - * @mgr: manager to use. - * - * This iterates over all proposed virtual channels, and tries to - * allocate space in the link for them. For 0->slots transitions, - * this step just writes the VCPI to the MST device. For slots->0 - * transitions, this writes the updated VCPIs and removes the - * remote VC payloads. - * - * after calling this the driver should generate ACT and payload - * packets. - */ -int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) -{ - int i, j; - int cur_slots = 1; - struct drm_dp_payload req_payload; - struct drm_dp_mst_port *port; - - mutex_lock(&mgr->payload_lock); - for (i = 0; i < mgr->max_payloads; i++) { - /* solve the current payloads - compare to the hw ones - - update the hw view */ - req_payload.start_slot = cur_slots; - if (mgr->proposed_vcpis[i]) { - port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) { - mutex_unlock(&mgr->payload_lock); - return -EINVAL; - } - req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; - req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; - } else { - port = NULL; - req_payload.num_slots = 0; - } - - if (mgr->payloads[i].start_slot != req_payload.start_slot) { - mgr->payloads[i].start_slot = req_payload.start_slot; - } - /* work out what is required to happen with this payload */ - if (mgr->payloads[i].num_slots != req_payload.num_slots) { - - /* need to push an update for this payload */ - if (req_payload.num_slots) { - drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); - mgr->payloads[i].num_slots = req_payload.num_slots; - mgr->payloads[i].vcpi = req_payload.vcpi; - } else if (mgr->payloads[i].num_slots) { - mgr->payloads[i].num_slots = 0; - drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]); - req_payload.payload_state = mgr->payloads[i].payload_state; - mgr->payloads[i].start_slot = 0; - } - mgr->payloads[i].payload_state = req_payload.payload_state; - } - cur_slots += req_payload.num_slots; - - if (port) - drm_dp_put_port(port); - } - - for (i = 0; i < mgr->max_payloads; i++) { - if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { - DRM_DEBUG_KMS("removing payload %d\n", i); - for (j = i; j < mgr->max_payloads - 1; j++) { - memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); - mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; - if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { - set_bit(j + 1, &mgr->payload_mask); - } else { - clear_bit(j + 1, &mgr->payload_mask); - } - } - memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); - mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; - clear_bit(mgr->max_payloads, &mgr->payload_mask); - - } - } - mutex_unlock(&mgr->payload_lock); - - return 0; -} -EXPORT_SYMBOL(drm_dp_update_payload_part1); - -/** - * drm_dp_update_payload_part2() - Execute payload update part 2 - * @mgr: manager to use. - * - * This iterates over all proposed virtual channels, and tries to - * allocate space in the link for them. For 0->slots transitions, - * this step writes the remote VC payload commands. For slots->0 - * this just resets some internal state. - */ -int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) -{ - struct drm_dp_mst_port *port; - int i; - int ret = 0; - mutex_lock(&mgr->payload_lock); - for (i = 0; i < mgr->max_payloads; i++) { - - if (!mgr->proposed_vcpis[i]) - continue; - - port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); - - DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); - if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { - ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); - } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { - ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); - } - if (ret) { - mutex_unlock(&mgr->payload_lock); - return ret; - } - } - mutex_unlock(&mgr->payload_lock); - return 0; -} -EXPORT_SYMBOL(drm_dp_update_payload_part2); - -#if 0 /* unused as of yet */ -static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, - int offset, int size) -{ - int len; - struct drm_dp_sideband_msg_tx *txmsg; - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) - return -ENOMEM; - - len = build_dpcd_read(txmsg, port->port_num, 0, 8); - txmsg->dst = port->parent; - - drm_dp_queue_down_tx(mgr, txmsg); - - return 0; -} -#endif - -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) -{ - int len; - int ret; - struct drm_dp_sideband_msg_tx *txmsg; - struct drm_dp_mst_branch *mstb; - - mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); - if (!mstb) - return -EINVAL; - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) { - ret = -ENOMEM; - goto fail_put; - } - - len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); - txmsg->dst = mstb; - - drm_dp_queue_down_tx(mgr, txmsg); - - ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret > 0) { - if (txmsg->reply.reply_type == 1) { - ret = -EINVAL; - } else - ret = 0; - } - kfree(txmsg); -fail_put: - drm_dp_put_mst_branch_device(mstb); - return ret; -} - -static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) -{ - struct drm_dp_sideband_msg_reply_body reply; - - reply.reply_type = 0; - reply.req_type = req_type; - drm_dp_encode_sideband_reply(&reply, msg); - return 0; -} - -static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_branch *mstb, - int req_type, int seqno, bool broadcast) -{ - struct drm_dp_sideband_msg_tx *txmsg; - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) - return -ENOMEM; - - txmsg->dst = mstb; - txmsg->seqno = seqno; - drm_dp_encode_up_ack_reply(txmsg, req_type); - - mutex_lock(&mgr->qlock); - - process_single_up_tx_qlock(mgr, txmsg); - - mutex_unlock(&mgr->qlock); - - kfree(txmsg); - return 0; -} - -static bool drm_dp_get_vc_payload_bw(int dp_link_bw, - int dp_link_count, - int *out) -{ - switch (dp_link_bw) { - default: - DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", - dp_link_bw, dp_link_count); - return false; - - case DP_LINK_BW_1_62: - *out = 3 * dp_link_count; - break; - case DP_LINK_BW_2_7: - *out = 5 * dp_link_count; - break; - case DP_LINK_BW_5_4: - *out = 10 * dp_link_count; - break; - } - return true; -} - -/** - * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager - * @mgr: manager to set state for - * @mst_state: true to enable MST on this connector - false to disable. - * - * This is called by the driver when it detects an MST capable device plugged - * into a DP MST capable port, or when a DP MST capable device is unplugged. - */ -int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) -{ - int ret = 0; - struct drm_dp_mst_branch *mstb = NULL; - - mutex_lock(&mgr->lock); - if (mst_state == mgr->mst_state) - goto out_unlock; - - mgr->mst_state = mst_state; - /* set the device into MST mode */ - if (mst_state) { - WARN_ON(mgr->mst_primary); - - /* get dpcd info */ - ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); - if (ret != DP_RECEIVER_CAP_SIZE) { - DRM_DEBUG_KMS("failed to read DPCD\n"); - goto out_unlock; - } - - if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], - mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, - &mgr->pbn_div)) { - ret = -EINVAL; - goto out_unlock; - } - - /* add initial branch device at LCT 1 */ - mstb = drm_dp_add_mst_branch_device(1, NULL); - if (mstb == NULL) { - ret = -ENOMEM; - goto out_unlock; - } - mstb->mgr = mgr; - - /* give this the main reference */ - mgr->mst_primary = mstb; - kref_get(&mgr->mst_primary->kref); - - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); - if (ret < 0) { - goto out_unlock; - } - - { - struct drm_dp_payload reset_pay; - reset_pay.start_slot = 0; - reset_pay.num_slots = 0x3f; - drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); - } - - queue_work(system_long_wq, &mgr->work); - - ret = 0; - } else { - /* disable MST on the device */ - 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); - ret = 0; - memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); - mgr->payload_mask = 0; - set_bit(0, &mgr->payload_mask); - mgr->vcpi_mask = 0; - } - -out_unlock: - mutex_unlock(&mgr->lock); - if (mstb) - drm_dp_put_mst_branch_device(mstb); - return ret; - -} -EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); - -/** - * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager - * @mgr: manager to suspend - * - * This function tells the MST device that we can't handle UP messages - * anymore. This should stop it from sending any since we are suspended. - */ -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); - mutex_unlock(&mgr->lock); - flush_work(&mgr->work); - flush_work(&mgr->destroy_connector_work); -} -EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); - -/** - * drm_dp_mst_topology_mgr_resume() - resume the MST manager - * @mgr: manager to resume - * - * 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 - * a full MST reprobe, in case we were undocked. - */ -int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) -{ - int ret = 0; - - mutex_lock(&mgr->lock); - - if (mgr->mst_primary) { - int sret; - u8 guid[16]; - - sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); - if (sret != DP_RECEIVER_CAP_SIZE) { - DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); - ret = -1; - goto out_unlock; - } - - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); - if (ret < 0) { - DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); - ret = -1; - goto out_unlock; - } - - /* Some hubs forget their guids after they resume */ - sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); - if (sret != 16) { - DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); - ret = -1; - goto out_unlock; - } - drm_dp_check_mstb_guid(mgr->mst_primary, guid); - - ret = 0; - } else - ret = -1; - -out_unlock: - mutex_unlock(&mgr->lock); - return ret; -} -EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); - -static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) -{ - int len; - u8 replyblock[32]; - int replylen, origlen, curreply; - int ret; - struct drm_dp_sideband_msg_rx *msg; - int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; - msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; - - len = min(mgr->max_dpcd_transaction_bytes, 16); - ret = drm_dp_dpcd_read(mgr->aux, basereg, - replyblock, len); - if (ret != len) { - DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); - return false; - } - ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); - if (!ret) { - DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); - return false; - } - replylen = msg->curchunk_len + msg->curchunk_hdrlen; - - origlen = replylen; - replylen -= len; - 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) { - DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", - len, ret); - return false; - } - - ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); - if (!ret) { - DRM_DEBUG_KMS("failed to build sideband msg\n"); - return false; - } - - curreply += len; - replylen -= len; - } - return true; -} - -static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) -{ - int ret = 0; - - if (!drm_dp_get_one_sb_msg(mgr, false)) { - memset(&mgr->down_rep_recv, 0, - sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - - if (mgr->down_rep_recv.have_eomt) { - struct drm_dp_sideband_msg_tx *txmsg; - struct drm_dp_mst_branch *mstb; - int slot = -1; - mstb = drm_dp_get_mst_branch_device(mgr, - mgr->down_rep_recv.initial_hdr.lct, - mgr->down_rep_recv.initial_hdr.rad); - - if (!mstb) { - DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); - memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - - /* find the message */ - slot = mgr->down_rep_recv.initial_hdr.seqno; - mutex_lock(&mgr->qlock); - txmsg = mstb->tx_slots[slot]; - /* remove from slots */ - mutex_unlock(&mgr->qlock); - - if (!txmsg) { - DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", - mstb, - mgr->down_rep_recv.initial_hdr.seqno, - mgr->down_rep_recv.initial_hdr.lct, - mgr->down_rep_recv.initial_hdr.rad[0], - mgr->down_rep_recv.msg[0]); - drm_dp_put_mst_branch_device(mstb); - memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - - drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); - if (txmsg->reply.reply_type == 1) { - DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); - } - - memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - drm_dp_put_mst_branch_device(mstb); - - mutex_lock(&mgr->qlock); - txmsg->state = DRM_DP_SIDEBAND_TX_RX; - mstb->tx_slots[slot] = NULL; - mutex_unlock(&mgr->qlock); - - wake_up_all(&mgr->tx_waitq); - } - return ret; -} - -static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) -{ - int ret = 0; - - if (!drm_dp_get_one_sb_msg(mgr, true)) { - memset(&mgr->up_req_recv, 0, - sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - - if (mgr->up_req_recv.have_eomt) { - struct drm_dp_sideband_msg_req_body msg; - struct drm_dp_mst_branch *mstb = NULL; - bool seqno; - - if (!mgr->up_req_recv.initial_hdr.broadcast) { - mstb = drm_dp_get_mst_branch_device(mgr, - mgr->up_req_recv.initial_hdr.lct, - mgr->up_req_recv.initial_hdr.rad); - if (!mstb) { - DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); - memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - } - - seqno = mgr->up_req_recv.initial_hdr.seqno; - drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); - - if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { - drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); - - if (!mstb) - mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); - - if (!mstb) { - DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); - memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - - drm_dp_update_port(mstb, &msg.u.conn_stat); - - DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); - (*mgr->cbs->hotplug)(mgr); - - } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { - drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); - if (!mstb) - mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); - - if (!mstb) { - DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); - memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - return 0; - } - - DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); - } - - if (mstb) - drm_dp_put_mst_branch_device(mstb); - - memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); - } - return ret; -} - -/** - * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify - * @mgr: manager to notify irq for. - * @esi: 4 bytes 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, - * 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. - */ -int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) -{ - int ret = 0; - int sc; - *handled = false; - sc = esi[0] & 0x3f; - - if (sc != mgr->sink_count) { - mgr->sink_count = sc; - *handled = true; - } - - if (esi[1] & DP_DOWN_REP_MSG_RDY) { - ret = drm_dp_mst_handle_down_rep(mgr); - *handled = true; - } - - if (esi[1] & DP_UP_REQ_MSG_RDY) { - ret |= drm_dp_mst_handle_up_req(mgr); - *handled = true; - } - - drm_dp_mst_kick_tx(mgr); - return ret; -} -EXPORT_SYMBOL(drm_dp_mst_hpd_irq); - -/** - * drm_dp_mst_detect_port() - get connection status for an MST port - * @connector: DRM connector for this port - * @mgr: manager for this port - * @port: unverified pointer to a port - * - * This returns the current connection state for a port. It validates the - * port pointer still exists so the caller doesn't require a reference - */ -enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, - struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) -{ - enum drm_connector_status status = connector_status_disconnected; - - /* we need to search for the port in the mgr in case its gone */ - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return connector_status_disconnected; - - if (!port->ddps) - goto out; - - switch (port->pdt) { - case DP_PEER_DEVICE_NONE: - case DP_PEER_DEVICE_MST_BRANCHING: - break; - - case DP_PEER_DEVICE_SST_SINK: - status = connector_status_connected; - /* for logical ports - cache the EDID */ - if (port->port_num >= 8 && !port->cached_edid) { - port->cached_edid = drm_get_edid(connector, &port->aux.ddc); - } - break; - case DP_PEER_DEVICE_DP_LEGACY_CONV: - if (port->ldps) - status = connector_status_connected; - break; - } -out: - drm_dp_put_port(port); - return status; -} -EXPORT_SYMBOL(drm_dp_mst_detect_port); - -/** - * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not - * @mgr: manager for this port - * @port: unverified pointer to a port. - * - * This returns whether the port supports audio or not. - */ -bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port) -{ - bool ret = false; - - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return ret; - ret = port->has_audio; - drm_dp_put_port(port); - return ret; -} -EXPORT_SYMBOL(drm_dp_mst_port_has_audio); - -/** - * 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 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) -{ - struct edid *edid = NULL; - - /* we need to search for the port in the mgr in case its gone */ - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return NULL; - - if (port->cached_edid) - edid = drm_edid_duplicate(port->cached_edid); - else { - edid = drm_get_edid(connector, &port->aux.ddc); - drm_mode_connector_set_tile_property(connector); - } - port->has_audio = drm_detect_monitor_audio(edid); - drm_dp_put_port(port); - return edid; -} -EXPORT_SYMBOL(drm_dp_mst_get_edid); - -/** - * drm_dp_find_vcpi_slots() - find slots for this PBN value - * @mgr: manager to use - * @pbn: payload bandwidth to convert into slots. - */ -int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, - int pbn) -{ - int num_slots; - - num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); - - /* max. time slots - one slot for MTP header */ - if (num_slots > 63) - return -ENOSPC; - return num_slots; -} -EXPORT_SYMBOL(drm_dp_find_vcpi_slots); - -static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_vcpi *vcpi, int pbn, int slots) -{ - int ret; - - /* max. time slots - one slot for MTP header */ - if (slots > 63) - return -ENOSPC; - - vcpi->pbn = pbn; - vcpi->aligned_pbn = slots * mgr->pbn_div; - vcpi->num_slots = slots; - - ret = drm_dp_mst_assign_payload_id(mgr, vcpi); - if (ret < 0) - return ret; - return 0; -} - -/** - * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state - * @state: global atomic state - * @mgr: MST topology manager for the port - * @port: port to find vcpi slots for - * @pbn: bandwidth required for the mode in PBN - * - * RETURNS: - * Total slots in the atomic state assigned for this port or error - */ -int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, - struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, int pbn) -{ - struct drm_dp_mst_topology_state *topology_state; - int req_slots; - - topology_state = drm_atomic_get_mst_topology_state(state, mgr); - if (topology_state == NULL) - return -ENOMEM; - - port = drm_dp_get_validated_port_ref(mgr, port); - if (port == NULL) - return -EINVAL; - req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); - DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n", - req_slots, topology_state->avail_slots); - - if (req_slots > topology_state->avail_slots) { - drm_dp_put_port(port); - return -ENOSPC; - } - - topology_state->avail_slots -= req_slots; - DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots); - - drm_dp_put_port(port); - return req_slots; -} -EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots); - -/** - * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots - * @state: global atomic state - * @mgr: MST topology manager for the port - * @slots: number of vcpi slots to release - * - * RETURNS: - * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or - * negative error code - */ -int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, - struct drm_dp_mst_topology_mgr *mgr, - int slots) -{ - struct drm_dp_mst_topology_state *topology_state; - - topology_state = drm_atomic_get_mst_topology_state(state, mgr); - if (topology_state == NULL) - return -ENOMEM; - - /* We cannot rely on port->vcpi.num_slots to update - * topology_state->avail_slots as the port may not exist if the parent - * branch device was unplugged. This should be fixed by tracking - * per-port slot allocation in drm_dp_mst_topology_state instead of - * depending on the caller to tell us how many slots to release. - */ - topology_state->avail_slots += slots; - DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n", - slots, topology_state->avail_slots); - - return 0; -} -EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots); - -/** - * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel - * @mgr: manager for this port - * @port: port to allocate a virtual channel for. - * @pbn: payload bandwidth number to request - * @slots: returned number of slots for this PBN. - */ -bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, int pbn, int slots) -{ - int ret; - - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return false; - - if (slots < 0) - return false; - - if (port->vcpi.vcpi > 0) { - DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); - if (pbn == port->vcpi.pbn) { - drm_dp_put_port(port); - return true; - } - } - - ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots); - if (ret) { - DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n", - DIV_ROUND_UP(pbn, mgr->pbn_div), ret); - goto out; - } - DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n", - pbn, port->vcpi.num_slots); - - drm_dp_put_port(port); - return true; -out: - return false; -} -EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); - -int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) -{ - int slots = 0; - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return slots; - - slots = port->vcpi.num_slots; - drm_dp_put_port(port); - return slots; -} -EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); - -/** - * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI - * @mgr: manager for this port - * @port: unverified pointer to a port. - * - * This just resets the number of slots for the ports VCPI for later programming. - */ -void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) -{ - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return; - port->vcpi.num_slots = 0; - drm_dp_put_port(port); -} -EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); - -/** - * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI - * @mgr: manager for this port - * @port: unverified port to deallocate vcpi for - */ -void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) -{ - port = drm_dp_get_validated_port_ref(mgr, port); - if (!port) - return; - - drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); - port->vcpi.num_slots = 0; - port->vcpi.pbn = 0; - port->vcpi.aligned_pbn = 0; - port->vcpi.vcpi = 0; - drm_dp_put_port(port); -} -EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); - -static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, - int id, struct drm_dp_payload *payload) -{ - 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] = payload->start_slot; - payload_alloc[2] = payload->num_slots; - - ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); - if (ret != 3) { - DRM_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("status not set after read payload table status %d\n", status); - ret = -EINVAL; - goto fail; - } - ret = 0; -fail: - return ret; -} - - -/** - * drm_dp_check_act_status() - Check ACT handled status. - * @mgr: manager to use - * - * Check the payload status bits in the DPCD for ACT handled completion. - */ -int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) -{ - u8 status; - int ret; - int count = 0; - - do { - ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); - - if (ret < 0) { - DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); - goto fail; - } - - if (status & DP_PAYLOAD_ACT_HANDLED) - break; - count++; - udelay(100); - - } while (count < 30); - - if (!(status & DP_PAYLOAD_ACT_HANDLED)) { - DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); - ret = -EINVAL; - goto fail; - } - return 0; -fail: - return ret; -} -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. - * - * 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) -{ - u64 kbps; - s64 peak_kbps; - u32 numerator; - u32 denominator; - - kbps = clock * 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 - */ - - numerator = 64 * 1006; - denominator = 54 * 8 * 1000 * 1000; - - kbps *= numerator; - peak_kbps = drm_fixp_from_fraction(kbps, denominator); - - return drm_fixp2int_ceil(peak_kbps); -} -EXPORT_SYMBOL(drm_dp_calc_pbn_mode); - -static int test_calc_pbn_mode(void) -{ - int ret; - ret = drm_dp_calc_pbn_mode(154000, 30); - if (ret != 689) { - DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", - 154000, 30, 689, ret); - return -EINVAL; - } - ret = drm_dp_calc_pbn_mode(234000, 30); - if (ret != 1047) { - DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", - 234000, 30, 1047, ret); - return -EINVAL; - } - ret = drm_dp_calc_pbn_mode(297000, 24); - if (ret != 1063) { - DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", - 297000, 24, 1063, ret); - return -EINVAL; - } - return 0; -} - -/* we want to kick the TX after we've ack the up/down IRQs. */ -static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) -{ - queue_work(system_long_wq, &mgr->tx_work); -} - -static void drm_dp_mst_dump_mstb(struct seq_file *m, - struct drm_dp_mst_branch *mstb) -{ - struct drm_dp_mst_port *port; - int tabs = mstb->lct; - char prefix[10]; - int i; - - for (i = 0; i < tabs; i++) - prefix[i] = '\t'; - prefix[i] = '\0'; - - seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); - list_for_each_entry(port, &mstb->ports, next) { - seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); - if (port->mstb) - drm_dp_mst_dump_mstb(m, port->mstb); - } -} - -static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, - char *buf) -{ - int i; - - for (i = 0; i < 64; i += 16) { - if (drm_dp_dpcd_read(mgr->aux, - DP_PAYLOAD_TABLE_UPDATE_STATUS + i, - &buf[i], 16) != 16) - return false; - } - return true; -} - -static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_port *port, char *name, - int namelen) -{ - struct edid *mst_edid; - - mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); - drm_edid_get_monitor_name(mst_edid, name, namelen); -} - -/** - * drm_dp_mst_dump_topology(): dump topology to seq file. - * @m: seq_file to dump output to - * @mgr: manager to dump current topology for. - * - * helper to dump MST topology to a seq file for debugfs. - */ -void drm_dp_mst_dump_topology(struct seq_file *m, - struct drm_dp_mst_topology_mgr *mgr) -{ - int i; - struct drm_dp_mst_port *port; - - mutex_lock(&mgr->lock); - if (mgr->mst_primary) - drm_dp_mst_dump_mstb(m, mgr->mst_primary); - - /* dump VCPIs */ - mutex_unlock(&mgr->lock); - - mutex_lock(&mgr->payload_lock); - seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, - mgr->max_payloads); - - for (i = 0; i < mgr->max_payloads; i++) { - if (mgr->proposed_vcpis[i]) { - char name[14]; - - port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); - fetch_monitor_name(mgr, port, name, sizeof(name)); - seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, - port->port_num, port->vcpi.vcpi, - port->vcpi.num_slots, - (*name != 0) ? name : "Unknown"); - } else - seq_printf(m, "vcpi %d:unused\n", i); - } - for (i = 0; i < mgr->max_payloads; i++) { - seq_printf(m, "payload %d: %d, %d, %d\n", - i, - mgr->payloads[i].payload_state, - mgr->payloads[i].start_slot, - mgr->payloads[i].num_slots); - - - } - mutex_unlock(&mgr->payload_lock); - - mutex_lock(&mgr->lock); - if (mgr->mst_primary) { - u8 buf[64]; - int ret; - - ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); - seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); - ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); - seq_printf(m, "faux/mst: %*ph\n", 2, buf); - ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); - 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); - seq_printf(m, "branch oui: %*phN devid: ", 3, buf); - for (i = 0x3; i < 0x8 && buf[i]; i++) - seq_printf(m, "%c", 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)) - seq_printf(m, "payload table: %*ph\n", 63, buf); - - } - - mutex_unlock(&mgr->lock); - -} -EXPORT_SYMBOL(drm_dp_mst_dump_topology); - -static void drm_dp_tx_work(struct work_struct *work) -{ - struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); - - mutex_lock(&mgr->qlock); - if (!list_empty(&mgr->tx_msg_downq)) - process_single_down_tx_qlock(mgr); - mutex_unlock(&mgr->qlock); -} - -static void drm_dp_free_mst_port(struct kref *kref) -{ - struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); - kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); - kfree(port); -} - -static void drm_dp_destroy_connector_work(struct work_struct *work) -{ - struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); - struct drm_dp_mst_port *port; - bool send_hotplug = false; - /* - * Not a regular list traverse as we have to drop the destroy - * connector lock before destroying the connector, to avoid AB->BA - * ordering between this lock and the config mutex. - */ - for (;;) { - mutex_lock(&mgr->destroy_connector_lock); - port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); - if (!port) { - mutex_unlock(&mgr->destroy_connector_lock); - break; - } - list_del(&port->next); - mutex_unlock(&mgr->destroy_connector_lock); - - kref_init(&port->kref); - INIT_LIST_HEAD(&port->next); - - mgr->cbs->destroy_connector(mgr, port->connector); - - drm_dp_port_teardown_pdt(port, port->pdt); - port->pdt = DP_PEER_DEVICE_NONE; - - if (!port->input && port->vcpi.vcpi > 0) { - drm_dp_mst_reset_vcpi_slots(mgr, port); - drm_dp_update_payload_part1(mgr); - drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); - } - - kref_put(&port->kref, drm_dp_free_mst_port); - send_hotplug = true; - } - if (send_hotplug) - (*mgr->cbs->hotplug)(mgr); -} - -void *drm_dp_mst_duplicate_state(struct drm_atomic_state *state, void *obj) -{ - struct drm_dp_mst_topology_mgr *mgr = obj; - struct drm_dp_mst_topology_state *new_mst_state; - - if (WARN_ON(!mgr->state)) - return NULL; - - new_mst_state = kmemdup(mgr->state, sizeof(*new_mst_state), GFP_KERNEL); - if (new_mst_state) - new_mst_state->state = state; - return new_mst_state; -} - -void drm_dp_mst_swap_state(void *obj, void **obj_state_ptr) -{ - struct drm_dp_mst_topology_mgr *mgr = obj; - struct drm_dp_mst_topology_state **topology_state_ptr; - - topology_state_ptr = (struct drm_dp_mst_topology_state **)obj_state_ptr; - - mgr->state->state = (*topology_state_ptr)->state; - swap(*topology_state_ptr, mgr->state); - mgr->state->state = NULL; -} - -void drm_dp_mst_destroy_state(void *obj_state) -{ - kfree(obj_state); -} - -static const struct drm_private_state_funcs mst_state_funcs = { - .duplicate_state = drm_dp_mst_duplicate_state, - .swap_state = drm_dp_mst_swap_state, - .destroy_state = drm_dp_mst_destroy_state, -}; - -/** - * drm_atomic_get_mst_topology_state: get MST topology state - * - * @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 - * state vtable so that the private object state returned is that of a MST - * topology object. Also, drm_atomic_get_private_obj_state() expects the caller - * to care of the locking, so warn if don't hold the connection_mutex. - * - * 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, - struct drm_dp_mst_topology_mgr *mgr) -{ - struct drm_device *dev = mgr->dev; - - WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); - return drm_atomic_get_private_obj_state(state, mgr, - &mst_state_funcs); -} -EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); - -/** - * drm_dp_mst_topology_mgr_init - initialise a topology manager - * @mgr: manager struct to initialise - * @dev: device providing this structure - for i2c addition. - * @aux: DP helper aux channel to talk to this device - * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit - * @max_payloads: maximum number of payloads this GPU can source - * @conn_base_id: the connector object ID the MST device is connected to. - * - * Return 0 for success, or negative error code on failure - */ -int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, - struct drm_device *dev, struct drm_dp_aux *aux, - int max_dpcd_transaction_bytes, - int max_payloads, int conn_base_id) -{ - mutex_init(&mgr->lock); - mutex_init(&mgr->qlock); - mutex_init(&mgr->payload_lock); - mutex_init(&mgr->destroy_connector_lock); - INIT_LIST_HEAD(&mgr->tx_msg_downq); - INIT_LIST_HEAD(&mgr->destroy_connector_list); - INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); - INIT_WORK(&mgr->tx_work, drm_dp_tx_work); - INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); - init_waitqueue_head(&mgr->tx_waitq); - mgr->dev = dev; - mgr->aux = aux; - mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; - mgr->max_payloads = max_payloads; - mgr->conn_base_id = conn_base_id; - if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || - max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) - return -EINVAL; - mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); - if (!mgr->payloads) - return -ENOMEM; - mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); - if (!mgr->proposed_vcpis) - return -ENOMEM; - set_bit(0, &mgr->payload_mask); - if (test_calc_pbn_mode() < 0) - DRM_ERROR("MST PBN self-test failed\n"); - - mgr->state = kzalloc(sizeof(*mgr->state), GFP_KERNEL); - if (mgr->state == NULL) - return -ENOMEM; - mgr->state->mgr = mgr; - - /* max. time slots - one slot for MTP header */ - mgr->state->avail_slots = 63; - mgr->funcs = &mst_state_funcs; - - return 0; -} -EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); - -/** - * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. - * @mgr: manager to destroy - */ -void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) -{ - flush_work(&mgr->work); - flush_work(&mgr->destroy_connector_work); - mutex_lock(&mgr->payload_lock); - kfree(mgr->payloads); - mgr->payloads = NULL; - kfree(mgr->proposed_vcpis); - mgr->proposed_vcpis = NULL; - mutex_unlock(&mgr->payload_lock); - mgr->dev = NULL; - mgr->aux = NULL; - kfree(mgr->state); - mgr->state = NULL; - mgr->funcs = NULL; -} -EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); - -/* I2C device */ -static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, - int num) -{ - struct drm_dp_aux *aux = adapter->algo_data; - struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); - struct drm_dp_mst_branch *mstb; - struct drm_dp_mst_topology_mgr *mgr = port->mgr; - unsigned int i; - bool reading = false; - struct drm_dp_sideband_msg_req_body msg; - struct drm_dp_sideband_msg_tx *txmsg = NULL; - int ret; - - mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); - if (!mstb) - return -EREMOTEIO; - - /* construct i2c msg */ - /* see if last msg is a read */ - if (msgs[num - 1].flags & I2C_M_RD) - reading = true; - - if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { - DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); - ret = -EIO; - goto out; - } - - memset(&msg, 0, sizeof(msg)); - msg.req_type = DP_REMOTE_I2C_READ; - msg.u.i2c_read.num_transactions = num - 1; - msg.u.i2c_read.port_number = port->port_num; - for (i = 0; i < num - 1; i++) { - msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; - msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; - msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; - } - msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; - msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; - - txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); - if (!txmsg) { - ret = -ENOMEM; - goto out; - } - - txmsg->dst = mstb; - drm_dp_encode_sideband_req(&msg, txmsg); - - drm_dp_queue_down_tx(mgr, txmsg); - - ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret > 0) { - - if (txmsg->reply.reply_type == 1) { /* got a NAK back */ - ret = -EREMOTEIO; - goto out; - } - if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { - ret = -EIO; - goto out; - } - memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); - ret = num; - } -out: - kfree(txmsg); - drm_dp_put_mst_branch_device(mstb); - return ret; -} - -static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) -{ - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | - I2C_FUNC_SMBUS_READ_BLOCK_DATA | - I2C_FUNC_SMBUS_BLOCK_PROC_CALL | - I2C_FUNC_10BIT_ADDR; -} - -static const struct i2c_algorithm drm_dp_mst_i2c_algo = { - .functionality = drm_dp_mst_i2c_functionality, - .master_xfer = drm_dp_mst_i2c_xfer, -}; - -/** - * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX - * @aux: DisplayPort AUX channel - * - * Returns 0 on success or a negative error code on failure. - */ -static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) -{ - aux->ddc.algo = &drm_dp_mst_i2c_algo; - aux->ddc.algo_data = aux; - aux->ddc.retries = 3; - - aux->ddc.class = I2C_CLASS_DDC; - aux->ddc.owner = THIS_MODULE; - aux->ddc.dev.parent = aux->dev; - aux->ddc.dev.of_node = aux->dev->of_node; - - strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), - sizeof(aux->ddc.name)); - - return i2c_add_adapter(&aux->ddc); -} - -/** - * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter - * @aux: DisplayPort AUX channel - */ -static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) -{ - i2c_del_adapter(&aux->ddc); -} |