1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-18 Intel Corporation. 3 4 /* 5 * stream.c - SoundWire Bus stream operations. 6 */ 7 8 #include <linux/delay.h> 9 #include <linux/device.h> 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/mod_devicetable.h> 13 #include <linux/slab.h> 14 #include <linux/soundwire/sdw_registers.h> 15 #include <linux/soundwire/sdw.h> 16 #include "bus.h" 17 18 /* 19 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1 20 * 21 * The rows are arranged as per the array index value programmed 22 * in register. The index 15 has dummy value 0 in order to fill hole. 23 */ 24 int rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147, 25 96, 100, 120, 128, 150, 160, 250, 0, 26 192, 200, 240, 256, 72, 144, 90, 180}; 27 28 int cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16}; 29 30 static int sdw_find_col_index(int col) 31 { 32 int i; 33 34 for (i = 0; i < SDW_FRAME_COLS; i++) { 35 if (cols[i] == col) 36 return i; 37 } 38 39 pr_warn("Requested column not found, selecting lowest column no: 2\n"); 40 return 0; 41 } 42 43 static int sdw_find_row_index(int row) 44 { 45 int i; 46 47 for (i = 0; i < SDW_FRAME_ROWS; i++) { 48 if (rows[i] == row) 49 return i; 50 } 51 52 pr_warn("Requested row not found, selecting lowest row no: 48\n"); 53 return 0; 54 } 55 56 static int _sdw_program_slave_port_params(struct sdw_bus *bus, 57 struct sdw_slave *slave, 58 struct sdw_transport_params *t_params, 59 enum sdw_dpn_type type) 60 { 61 u32 addr1, addr2, addr3, addr4; 62 int ret; 63 u16 wbuf; 64 65 if (bus->params.next_bank) { 66 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num); 67 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num); 68 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num); 69 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num); 70 } else { 71 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num); 72 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num); 73 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num); 74 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num); 75 } 76 77 /* Program DPN_OffsetCtrl2 registers */ 78 ret = sdw_write(slave, addr1, t_params->offset2); 79 if (ret < 0) { 80 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n"); 81 return ret; 82 } 83 84 /* Program DPN_BlockCtrl3 register */ 85 ret = sdw_write(slave, addr2, t_params->blk_pkg_mode); 86 if (ret < 0) { 87 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n"); 88 return ret; 89 } 90 91 /* 92 * Data ports are FULL, SIMPLE and REDUCED. This function handles 93 * FULL and REDUCED only and beyond this point only FULL is 94 * handled, so bail out if we are not FULL data port type 95 */ 96 if (type != SDW_DPN_FULL) 97 return ret; 98 99 /* Program DPN_SampleCtrl2 register */ 100 wbuf = (t_params->sample_interval - 1); 101 wbuf &= SDW_DPN_SAMPLECTRL_HIGH; 102 wbuf >>= SDW_REG_SHIFT(SDW_DPN_SAMPLECTRL_HIGH); 103 104 ret = sdw_write(slave, addr3, wbuf); 105 if (ret < 0) { 106 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n"); 107 return ret; 108 } 109 110 /* Program DPN_HCtrl register */ 111 wbuf = t_params->hstart; 112 wbuf <<= SDW_REG_SHIFT(SDW_DPN_HCTRL_HSTART); 113 wbuf |= t_params->hstop; 114 115 ret = sdw_write(slave, addr4, wbuf); 116 if (ret < 0) 117 dev_err(bus->dev, "DPN_HCtrl register write failed\n"); 118 119 return ret; 120 } 121 122 static int sdw_program_slave_port_params(struct sdw_bus *bus, 123 struct sdw_slave_runtime *s_rt, 124 struct sdw_port_runtime *p_rt) 125 { 126 struct sdw_transport_params *t_params = &p_rt->transport_params; 127 struct sdw_port_params *p_params = &p_rt->port_params; 128 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop; 129 u32 addr1, addr2, addr3, addr4, addr5, addr6; 130 struct sdw_dpn_prop *dpn_prop; 131 int ret; 132 u8 wbuf; 133 134 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 135 s_rt->direction, 136 t_params->port_num); 137 if (!dpn_prop) 138 return -EINVAL; 139 140 addr1 = SDW_DPN_PORTCTRL(t_params->port_num); 141 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num); 142 143 if (bus->params.next_bank) { 144 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num); 145 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num); 146 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num); 147 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num); 148 149 } else { 150 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num); 151 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num); 152 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num); 153 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num); 154 } 155 156 /* Program DPN_PortCtrl register */ 157 wbuf = p_params->data_mode << SDW_REG_SHIFT(SDW_DPN_PORTCTRL_DATAMODE); 158 wbuf |= p_params->flow_mode; 159 160 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf); 161 if (ret < 0) { 162 dev_err(&s_rt->slave->dev, 163 "DPN_PortCtrl register write failed for port %d\n", 164 t_params->port_num); 165 return ret; 166 } 167 168 /* Program DPN_BlockCtrl1 register */ 169 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1)); 170 if (ret < 0) { 171 dev_err(&s_rt->slave->dev, 172 "DPN_BlockCtrl1 register write failed for port %d\n", 173 t_params->port_num); 174 return ret; 175 } 176 177 /* Program DPN_SampleCtrl1 register */ 178 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW; 179 ret = sdw_write(s_rt->slave, addr3, wbuf); 180 if (ret < 0) { 181 dev_err(&s_rt->slave->dev, 182 "DPN_SampleCtrl1 register write failed for port %d\n", 183 t_params->port_num); 184 return ret; 185 } 186 187 /* Program DPN_OffsetCtrl1 registers */ 188 ret = sdw_write(s_rt->slave, addr4, t_params->offset1); 189 if (ret < 0) { 190 dev_err(&s_rt->slave->dev, 191 "DPN_OffsetCtrl1 register write failed for port %d\n", 192 t_params->port_num); 193 return ret; 194 } 195 196 /* Program DPN_BlockCtrl2 register*/ 197 if (t_params->blk_grp_ctrl_valid) { 198 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl); 199 if (ret < 0) { 200 dev_err(&s_rt->slave->dev, 201 "DPN_BlockCtrl2 reg write failed for port %d\n", 202 t_params->port_num); 203 return ret; 204 } 205 } 206 207 /* program DPN_LaneCtrl register */ 208 if (slave_prop->lane_control_support) { 209 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl); 210 if (ret < 0) { 211 dev_err(&s_rt->slave->dev, 212 "DPN_LaneCtrl register write failed for port %d\n", 213 t_params->port_num); 214 return ret; 215 } 216 } 217 218 if (dpn_prop->type != SDW_DPN_SIMPLE) { 219 ret = _sdw_program_slave_port_params(bus, s_rt->slave, 220 t_params, dpn_prop->type); 221 if (ret < 0) 222 dev_err(&s_rt->slave->dev, 223 "Transport reg write failed for port: %d\n", 224 t_params->port_num); 225 } 226 227 return ret; 228 } 229 230 static int sdw_program_master_port_params(struct sdw_bus *bus, 231 struct sdw_port_runtime *p_rt) 232 { 233 int ret; 234 235 /* 236 * we need to set transport and port parameters for the port. 237 * Transport parameters refers to the sample interval, offsets and 238 * hstart/stop etc of the data. Port parameters refers to word 239 * length, flow mode etc of the port 240 */ 241 ret = bus->port_ops->dpn_set_port_transport_params(bus, 242 &p_rt->transport_params, 243 bus->params.next_bank); 244 if (ret < 0) 245 return ret; 246 247 return bus->port_ops->dpn_set_port_params(bus, 248 &p_rt->port_params, 249 bus->params.next_bank); 250 } 251 252 /** 253 * sdw_program_port_params() - Programs transport parameters of Master(s) 254 * and Slave(s) 255 * 256 * @m_rt: Master stream runtime 257 */ 258 static int sdw_program_port_params(struct sdw_master_runtime *m_rt) 259 { 260 struct sdw_slave_runtime *s_rt = NULL; 261 struct sdw_bus *bus = m_rt->bus; 262 struct sdw_port_runtime *p_rt; 263 int ret = 0; 264 265 /* Program transport & port parameters for Slave(s) */ 266 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 267 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 268 ret = sdw_program_slave_port_params(bus, s_rt, p_rt); 269 if (ret < 0) 270 return ret; 271 } 272 } 273 274 /* Program transport & port parameters for Master(s) */ 275 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 276 ret = sdw_program_master_port_params(bus, p_rt); 277 if (ret < 0) 278 return ret; 279 } 280 281 return 0; 282 } 283 284 /** 285 * sdw_enable_disable_slave_ports: Enable/disable slave data port 286 * 287 * @bus: bus instance 288 * @s_rt: slave runtime 289 * @p_rt: port runtime 290 * @en: enable or disable operation 291 * 292 * This function only sets the enable/disable bits in the relevant bank, the 293 * actual enable/disable is done with a bank switch 294 */ 295 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus, 296 struct sdw_slave_runtime *s_rt, 297 struct sdw_port_runtime *p_rt, 298 bool en) 299 { 300 struct sdw_transport_params *t_params = &p_rt->transport_params; 301 u32 addr; 302 int ret; 303 304 if (bus->params.next_bank) 305 addr = SDW_DPN_CHANNELEN_B1(p_rt->num); 306 else 307 addr = SDW_DPN_CHANNELEN_B0(p_rt->num); 308 309 /* 310 * Since bus doesn't support sharing a port across two streams, 311 * it is safe to reset this register 312 */ 313 if (en) 314 ret = sdw_update(s_rt->slave, addr, 0xFF, p_rt->ch_mask); 315 else 316 ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0); 317 318 if (ret < 0) 319 dev_err(&s_rt->slave->dev, 320 "Slave chn_en reg write failed:%d port:%d\n", 321 ret, t_params->port_num); 322 323 return ret; 324 } 325 326 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt, 327 struct sdw_port_runtime *p_rt, 328 bool en) 329 { 330 struct sdw_transport_params *t_params = &p_rt->transport_params; 331 struct sdw_bus *bus = m_rt->bus; 332 struct sdw_enable_ch enable_ch; 333 int ret; 334 335 enable_ch.port_num = p_rt->num; 336 enable_ch.ch_mask = p_rt->ch_mask; 337 enable_ch.enable = en; 338 339 /* Perform Master port channel(s) enable/disable */ 340 if (bus->port_ops->dpn_port_enable_ch) { 341 ret = bus->port_ops->dpn_port_enable_ch(bus, 342 &enable_ch, 343 bus->params.next_bank); 344 if (ret < 0) { 345 dev_err(bus->dev, 346 "Master chn_en write failed:%d port:%d\n", 347 ret, t_params->port_num); 348 return ret; 349 } 350 } else { 351 dev_err(bus->dev, 352 "dpn_port_enable_ch not supported, %s failed\n", 353 en ? "enable" : "disable"); 354 return -EINVAL; 355 } 356 357 return 0; 358 } 359 360 /** 361 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and 362 * Slave(s) 363 * 364 * @m_rt: Master stream runtime 365 * @en: mode (enable/disable) 366 */ 367 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en) 368 { 369 struct sdw_port_runtime *s_port, *m_port; 370 struct sdw_slave_runtime *s_rt = NULL; 371 int ret = 0; 372 373 /* Enable/Disable Slave port(s) */ 374 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 375 list_for_each_entry(s_port, &s_rt->port_list, port_node) { 376 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt, 377 s_port, en); 378 if (ret < 0) 379 return ret; 380 } 381 } 382 383 /* Enable/Disable Master port(s) */ 384 list_for_each_entry(m_port, &m_rt->port_list, port_node) { 385 ret = sdw_enable_disable_master_ports(m_rt, m_port, en); 386 if (ret < 0) 387 return ret; 388 } 389 390 return 0; 391 } 392 393 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt, 394 struct sdw_prepare_ch prep_ch, 395 enum sdw_port_prep_ops cmd) 396 { 397 const struct sdw_slave_ops *ops = s_rt->slave->ops; 398 int ret; 399 400 if (ops->port_prep) { 401 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd); 402 if (ret < 0) { 403 dev_err(&s_rt->slave->dev, 404 "Slave Port Prep cmd %d failed: %d\n", 405 cmd, ret); 406 return ret; 407 } 408 } 409 410 return 0; 411 } 412 413 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus, 414 struct sdw_slave_runtime *s_rt, 415 struct sdw_port_runtime *p_rt, 416 bool prep) 417 { 418 struct completion *port_ready = NULL; 419 struct sdw_dpn_prop *dpn_prop; 420 struct sdw_prepare_ch prep_ch; 421 unsigned int time_left; 422 bool intr = false; 423 int ret = 0, val; 424 u32 addr; 425 426 prep_ch.num = p_rt->num; 427 prep_ch.ch_mask = p_rt->ch_mask; 428 429 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 430 s_rt->direction, 431 prep_ch.num); 432 if (!dpn_prop) { 433 dev_err(bus->dev, 434 "Slave Port:%d properties not found\n", prep_ch.num); 435 return -EINVAL; 436 } 437 438 prep_ch.prepare = prep; 439 440 prep_ch.bank = bus->params.next_bank; 441 442 if (dpn_prop->device_interrupts || !dpn_prop->simple_ch_prep_sm) 443 intr = true; 444 445 /* 446 * Enable interrupt before Port prepare. 447 * For Port de-prepare, it is assumed that port 448 * was prepared earlier 449 */ 450 if (prep && intr) { 451 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 452 dpn_prop->device_interrupts); 453 if (ret < 0) 454 return ret; 455 } 456 457 /* Inform slave about the impending port prepare */ 458 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP); 459 460 /* Prepare Slave port implementing CP_SM */ 461 if (!dpn_prop->simple_ch_prep_sm) { 462 addr = SDW_DPN_PREPARECTRL(p_rt->num); 463 464 if (prep) 465 ret = sdw_update(s_rt->slave, addr, 466 0xFF, p_rt->ch_mask); 467 else 468 ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0); 469 470 if (ret < 0) { 471 dev_err(&s_rt->slave->dev, 472 "Slave prep_ctrl reg write failed\n"); 473 return ret; 474 } 475 476 /* Wait for completion on port ready */ 477 port_ready = &s_rt->slave->port_ready[prep_ch.num]; 478 time_left = wait_for_completion_timeout(port_ready, 479 msecs_to_jiffies(dpn_prop->ch_prep_timeout)); 480 481 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num)); 482 val &= p_rt->ch_mask; 483 if (!time_left || val) { 484 dev_err(&s_rt->slave->dev, 485 "Chn prep failed for port:%d\n", prep_ch.num); 486 return -ETIMEDOUT; 487 } 488 } 489 490 /* Inform slaves about ports prepared */ 491 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP); 492 493 /* Disable interrupt after Port de-prepare */ 494 if (!prep && intr) 495 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 496 dpn_prop->device_interrupts); 497 498 return ret; 499 } 500 501 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt, 502 struct sdw_port_runtime *p_rt, 503 bool prep) 504 { 505 struct sdw_transport_params *t_params = &p_rt->transport_params; 506 struct sdw_bus *bus = m_rt->bus; 507 const struct sdw_master_port_ops *ops = bus->port_ops; 508 struct sdw_prepare_ch prep_ch; 509 int ret = 0; 510 511 prep_ch.num = p_rt->num; 512 prep_ch.ch_mask = p_rt->ch_mask; 513 prep_ch.prepare = prep; /* Prepare/De-prepare */ 514 prep_ch.bank = bus->params.next_bank; 515 516 /* Pre-prepare/Pre-deprepare port(s) */ 517 if (ops->dpn_port_prep) { 518 ret = ops->dpn_port_prep(bus, &prep_ch); 519 if (ret < 0) { 520 dev_err(bus->dev, "Port prepare failed for port:%d\n", 521 t_params->port_num); 522 return ret; 523 } 524 } 525 526 return ret; 527 } 528 529 /** 530 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and 531 * Slave(s) 532 * 533 * @m_rt: Master runtime handle 534 * @prep: Prepare or De-prepare 535 */ 536 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep) 537 { 538 struct sdw_slave_runtime *s_rt = NULL; 539 struct sdw_port_runtime *p_rt; 540 int ret = 0; 541 542 /* Prepare/De-prepare Slave port(s) */ 543 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 544 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 545 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt, 546 p_rt, prep); 547 if (ret < 0) 548 return ret; 549 } 550 } 551 552 /* Prepare/De-prepare Master port(s) */ 553 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 554 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep); 555 if (ret < 0) 556 return ret; 557 } 558 559 return ret; 560 } 561 562 /** 563 * sdw_notify_config() - Notify bus configuration 564 * 565 * @m_rt: Master runtime handle 566 * 567 * This function notifies the Master(s) and Slave(s) of the 568 * new bus configuration. 569 */ 570 static int sdw_notify_config(struct sdw_master_runtime *m_rt) 571 { 572 struct sdw_slave_runtime *s_rt; 573 struct sdw_bus *bus = m_rt->bus; 574 struct sdw_slave *slave; 575 int ret = 0; 576 577 if (bus->ops->set_bus_conf) { 578 ret = bus->ops->set_bus_conf(bus, &bus->params); 579 if (ret < 0) 580 return ret; 581 } 582 583 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 584 slave = s_rt->slave; 585 586 if (slave->ops->bus_config) { 587 ret = slave->ops->bus_config(slave, &bus->params); 588 if (ret < 0) 589 dev_err(bus->dev, "Notify Slave: %d failed\n", 590 slave->dev_num); 591 return ret; 592 } 593 } 594 595 return ret; 596 } 597 598 /** 599 * sdw_program_params() - Program transport and port parameters for Master(s) 600 * and Slave(s) 601 * 602 * @bus: SDW bus instance 603 */ 604 static int sdw_program_params(struct sdw_bus *bus) 605 { 606 struct sdw_master_runtime *m_rt = NULL; 607 int ret = 0; 608 609 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) { 610 ret = sdw_program_port_params(m_rt); 611 if (ret < 0) { 612 dev_err(bus->dev, 613 "Program transport params failed: %d\n", ret); 614 return ret; 615 } 616 617 ret = sdw_notify_config(m_rt); 618 if (ret < 0) { 619 dev_err(bus->dev, 620 "Notify bus config failed: %d\n", ret); 621 return ret; 622 } 623 624 /* Enable port(s) on alternate bank for all active streams */ 625 if (m_rt->stream->state != SDW_STREAM_ENABLED) 626 continue; 627 628 ret = sdw_enable_disable_ports(m_rt, true); 629 if (ret < 0) { 630 dev_err(bus->dev, "Enable channel failed: %d\n", ret); 631 return ret; 632 } 633 } 634 635 return ret; 636 } 637 638 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count) 639 { 640 int col_index, row_index; 641 bool multi_link; 642 struct sdw_msg *wr_msg; 643 u8 *wbuf = NULL; 644 int ret = 0; 645 u16 addr; 646 647 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL); 648 if (!wr_msg) 649 return -ENOMEM; 650 651 bus->defer_msg.msg = wr_msg; 652 653 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL); 654 if (!wbuf) { 655 ret = -ENOMEM; 656 goto error_1; 657 } 658 659 /* Get row and column index to program register */ 660 col_index = sdw_find_col_index(bus->params.col); 661 row_index = sdw_find_row_index(bus->params.row); 662 wbuf[0] = col_index | (row_index << 3); 663 664 if (bus->params.next_bank) 665 addr = SDW_SCP_FRAMECTRL_B1; 666 else 667 addr = SDW_SCP_FRAMECTRL_B0; 668 669 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM, 670 SDW_MSG_FLAG_WRITE, wbuf); 671 wr_msg->ssp_sync = true; 672 673 /* 674 * Set the multi_link flag only when both the hardware supports 675 * and there is a stream handled by multiple masters 676 */ 677 multi_link = bus->multi_link && (m_rt_count > 1); 678 679 if (multi_link) 680 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg); 681 else 682 ret = sdw_transfer(bus, wr_msg); 683 684 if (ret < 0) { 685 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n"); 686 goto error; 687 } 688 689 if (!multi_link) { 690 kfree(wr_msg); 691 kfree(wbuf); 692 bus->defer_msg.msg = NULL; 693 bus->params.curr_bank = !bus->params.curr_bank; 694 bus->params.next_bank = !bus->params.next_bank; 695 } 696 697 return 0; 698 699 error: 700 kfree(wbuf); 701 error_1: 702 kfree(wr_msg); 703 return ret; 704 } 705 706 /** 707 * sdw_ml_sync_bank_switch: Multilink register bank switch 708 * 709 * @bus: SDW bus instance 710 * 711 * Caller function should free the buffers on error 712 */ 713 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus) 714 { 715 unsigned long time_left; 716 717 if (!bus->multi_link) 718 return 0; 719 720 /* Wait for completion of transfer */ 721 time_left = wait_for_completion_timeout(&bus->defer_msg.complete, 722 bus->bank_switch_timeout); 723 724 if (!time_left) { 725 dev_err(bus->dev, "Controller Timed out on bank switch\n"); 726 return -ETIMEDOUT; 727 } 728 729 bus->params.curr_bank = !bus->params.curr_bank; 730 bus->params.next_bank = !bus->params.next_bank; 731 732 if (bus->defer_msg.msg) { 733 kfree(bus->defer_msg.msg->buf); 734 kfree(bus->defer_msg.msg); 735 } 736 737 return 0; 738 } 739 740 static int do_bank_switch(struct sdw_stream_runtime *stream) 741 { 742 struct sdw_master_runtime *m_rt = NULL; 743 const struct sdw_master_ops *ops; 744 struct sdw_bus *bus = NULL; 745 bool multi_link = false; 746 int ret = 0; 747 748 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 749 bus = m_rt->bus; 750 ops = bus->ops; 751 752 if (bus->multi_link) { 753 multi_link = true; 754 mutex_lock(&bus->msg_lock); 755 } 756 757 /* Pre-bank switch */ 758 if (ops->pre_bank_switch) { 759 ret = ops->pre_bank_switch(bus); 760 if (ret < 0) { 761 dev_err(bus->dev, 762 "Pre bank switch op failed: %d\n", ret); 763 goto msg_unlock; 764 } 765 } 766 767 /* 768 * Perform Bank switch operation. 769 * For multi link cases, the actual bank switch is 770 * synchronized across all Masters and happens later as a 771 * part of post_bank_switch ops. 772 */ 773 ret = sdw_bank_switch(bus, stream->m_rt_count); 774 if (ret < 0) { 775 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 776 goto error; 777 } 778 } 779 780 /* 781 * For multi link cases, it is expected that the bank switch is 782 * triggered by the post_bank_switch for the first Master in the list 783 * and for the other Masters the post_bank_switch() should return doing 784 * nothing. 785 */ 786 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 787 bus = m_rt->bus; 788 ops = bus->ops; 789 790 /* Post-bank switch */ 791 if (ops->post_bank_switch) { 792 ret = ops->post_bank_switch(bus); 793 if (ret < 0) { 794 dev_err(bus->dev, 795 "Post bank switch op failed: %d\n", 796 ret); 797 goto error; 798 } 799 } else if (bus->multi_link && stream->m_rt_count > 1) { 800 dev_err(bus->dev, 801 "Post bank switch ops not implemented\n"); 802 goto error; 803 } 804 805 /* Set the bank switch timeout to default, if not set */ 806 if (!bus->bank_switch_timeout) 807 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT; 808 809 /* Check if bank switch was successful */ 810 ret = sdw_ml_sync_bank_switch(bus); 811 if (ret < 0) { 812 dev_err(bus->dev, 813 "multi link bank switch failed: %d\n", ret); 814 goto error; 815 } 816 817 mutex_unlock(&bus->msg_lock); 818 } 819 820 return ret; 821 822 error: 823 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 824 bus = m_rt->bus; 825 826 kfree(bus->defer_msg.msg->buf); 827 kfree(bus->defer_msg.msg); 828 } 829 830 msg_unlock: 831 832 if (multi_link) { 833 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 834 bus = m_rt->bus; 835 if (mutex_is_locked(&bus->msg_lock)) 836 mutex_unlock(&bus->msg_lock); 837 } 838 } 839 840 return ret; 841 } 842 843 /** 844 * sdw_release_stream() - Free the assigned stream runtime 845 * 846 * @stream: SoundWire stream runtime 847 * 848 * sdw_release_stream should be called only once per stream 849 */ 850 void sdw_release_stream(struct sdw_stream_runtime *stream) 851 { 852 kfree(stream); 853 } 854 EXPORT_SYMBOL(sdw_release_stream); 855 856 /** 857 * sdw_alloc_stream() - Allocate and return stream runtime 858 * 859 * @stream_name: SoundWire stream name 860 * 861 * Allocates a SoundWire stream runtime instance. 862 * sdw_alloc_stream should be called only once per stream. Typically 863 * invoked from ALSA/ASoC machine/platform driver. 864 */ 865 struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name) 866 { 867 struct sdw_stream_runtime *stream; 868 869 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 870 if (!stream) 871 return NULL; 872 873 stream->name = stream_name; 874 INIT_LIST_HEAD(&stream->master_list); 875 stream->state = SDW_STREAM_ALLOCATED; 876 stream->m_rt_count = 0; 877 878 return stream; 879 } 880 EXPORT_SYMBOL(sdw_alloc_stream); 881 882 static struct sdw_master_runtime 883 *sdw_find_master_rt(struct sdw_bus *bus, 884 struct sdw_stream_runtime *stream) 885 { 886 struct sdw_master_runtime *m_rt = NULL; 887 888 /* Retrieve Bus handle if already available */ 889 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 890 if (m_rt->bus == bus) 891 return m_rt; 892 } 893 894 return NULL; 895 } 896 897 /** 898 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle 899 * 900 * @bus: SDW bus instance 901 * @stream_config: Stream configuration 902 * @stream: Stream runtime handle. 903 * 904 * This function is to be called with bus_lock held. 905 */ 906 static struct sdw_master_runtime 907 *sdw_alloc_master_rt(struct sdw_bus *bus, 908 struct sdw_stream_config *stream_config, 909 struct sdw_stream_runtime *stream) 910 { 911 struct sdw_master_runtime *m_rt; 912 913 /* 914 * check if Master is already allocated (as a result of Slave adding 915 * it first), if so skip allocation and go to configure 916 */ 917 m_rt = sdw_find_master_rt(bus, stream); 918 if (m_rt) 919 goto stream_config; 920 921 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL); 922 if (!m_rt) 923 return NULL; 924 925 /* Initialization of Master runtime handle */ 926 INIT_LIST_HEAD(&m_rt->port_list); 927 INIT_LIST_HEAD(&m_rt->slave_rt_list); 928 list_add_tail(&m_rt->stream_node, &stream->master_list); 929 930 list_add_tail(&m_rt->bus_node, &bus->m_rt_list); 931 932 stream_config: 933 m_rt->ch_count = stream_config->ch_count; 934 m_rt->bus = bus; 935 m_rt->stream = stream; 936 m_rt->direction = stream_config->direction; 937 938 return m_rt; 939 } 940 941 /** 942 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle. 943 * 944 * @slave: Slave handle 945 * @stream_config: Stream configuration 946 * @stream: Stream runtime handle 947 * 948 * This function is to be called with bus_lock held. 949 */ 950 static struct sdw_slave_runtime 951 *sdw_alloc_slave_rt(struct sdw_slave *slave, 952 struct sdw_stream_config *stream_config, 953 struct sdw_stream_runtime *stream) 954 { 955 struct sdw_slave_runtime *s_rt = NULL; 956 957 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL); 958 if (!s_rt) 959 return NULL; 960 961 INIT_LIST_HEAD(&s_rt->port_list); 962 s_rt->ch_count = stream_config->ch_count; 963 s_rt->direction = stream_config->direction; 964 s_rt->slave = slave; 965 966 return s_rt; 967 } 968 969 static void sdw_master_port_release(struct sdw_bus *bus, 970 struct sdw_master_runtime *m_rt) 971 { 972 struct sdw_port_runtime *p_rt, *_p_rt; 973 974 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) { 975 list_del(&p_rt->port_node); 976 kfree(p_rt); 977 } 978 } 979 980 static void sdw_slave_port_release(struct sdw_bus *bus, 981 struct sdw_slave *slave, 982 struct sdw_stream_runtime *stream) 983 { 984 struct sdw_port_runtime *p_rt, *_p_rt; 985 struct sdw_master_runtime *m_rt; 986 struct sdw_slave_runtime *s_rt; 987 988 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 989 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 990 if (s_rt->slave != slave) 991 continue; 992 993 list_for_each_entry_safe(p_rt, _p_rt, 994 &s_rt->port_list, port_node) { 995 list_del(&p_rt->port_node); 996 kfree(p_rt); 997 } 998 } 999 } 1000 } 1001 1002 /** 1003 * sdw_release_slave_stream() - Free Slave(s) runtime handle 1004 * 1005 * @slave: Slave handle. 1006 * @stream: Stream runtime handle. 1007 * 1008 * This function is to be called with bus_lock held. 1009 */ 1010 static void sdw_release_slave_stream(struct sdw_slave *slave, 1011 struct sdw_stream_runtime *stream) 1012 { 1013 struct sdw_slave_runtime *s_rt, *_s_rt; 1014 struct sdw_master_runtime *m_rt; 1015 1016 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1017 /* Retrieve Slave runtime handle */ 1018 list_for_each_entry_safe(s_rt, _s_rt, 1019 &m_rt->slave_rt_list, m_rt_node) { 1020 if (s_rt->slave == slave) { 1021 list_del(&s_rt->m_rt_node); 1022 kfree(s_rt); 1023 return; 1024 } 1025 } 1026 } 1027 } 1028 1029 /** 1030 * sdw_release_master_stream() - Free Master runtime handle 1031 * 1032 * @m_rt: Master runtime node 1033 * @stream: Stream runtime handle. 1034 * 1035 * This function is to be called with bus_lock held 1036 * It frees the Master runtime handle and associated Slave(s) runtime 1037 * handle. If this is called first then sdw_release_slave_stream() will have 1038 * no effect as Slave(s) runtime handle would already be freed up. 1039 */ 1040 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt, 1041 struct sdw_stream_runtime *stream) 1042 { 1043 struct sdw_slave_runtime *s_rt, *_s_rt; 1044 1045 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) { 1046 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream); 1047 sdw_release_slave_stream(s_rt->slave, stream); 1048 } 1049 1050 list_del(&m_rt->stream_node); 1051 list_del(&m_rt->bus_node); 1052 kfree(m_rt); 1053 } 1054 1055 /** 1056 * sdw_stream_remove_master() - Remove master from sdw_stream 1057 * 1058 * @bus: SDW Bus instance 1059 * @stream: SoundWire stream 1060 * 1061 * This removes and frees port_rt and master_rt from a stream 1062 */ 1063 int sdw_stream_remove_master(struct sdw_bus *bus, 1064 struct sdw_stream_runtime *stream) 1065 { 1066 struct sdw_master_runtime *m_rt, *_m_rt; 1067 1068 mutex_lock(&bus->bus_lock); 1069 1070 list_for_each_entry_safe(m_rt, _m_rt, 1071 &stream->master_list, stream_node) { 1072 if (m_rt->bus != bus) 1073 continue; 1074 1075 sdw_master_port_release(bus, m_rt); 1076 sdw_release_master_stream(m_rt, stream); 1077 stream->m_rt_count--; 1078 } 1079 1080 if (list_empty(&stream->master_list)) 1081 stream->state = SDW_STREAM_RELEASED; 1082 1083 mutex_unlock(&bus->bus_lock); 1084 1085 return 0; 1086 } 1087 EXPORT_SYMBOL(sdw_stream_remove_master); 1088 1089 /** 1090 * sdw_stream_remove_slave() - Remove slave from sdw_stream 1091 * 1092 * @slave: SDW Slave instance 1093 * @stream: SoundWire stream 1094 * 1095 * This removes and frees port_rt and slave_rt from a stream 1096 */ 1097 int sdw_stream_remove_slave(struct sdw_slave *slave, 1098 struct sdw_stream_runtime *stream) 1099 { 1100 mutex_lock(&slave->bus->bus_lock); 1101 1102 sdw_slave_port_release(slave->bus, slave, stream); 1103 sdw_release_slave_stream(slave, stream); 1104 1105 mutex_unlock(&slave->bus->bus_lock); 1106 1107 return 0; 1108 } 1109 EXPORT_SYMBOL(sdw_stream_remove_slave); 1110 1111 /** 1112 * sdw_config_stream() - Configure the allocated stream 1113 * 1114 * @dev: SDW device 1115 * @stream: SoundWire stream 1116 * @stream_config: Stream configuration for audio stream 1117 * @is_slave: is API called from Slave or Master 1118 * 1119 * This function is to be called with bus_lock held. 1120 */ 1121 static int sdw_config_stream(struct device *dev, 1122 struct sdw_stream_runtime *stream, 1123 struct sdw_stream_config *stream_config, 1124 bool is_slave) 1125 { 1126 /* 1127 * Update the stream rate, channel and bps based on data 1128 * source. For more than one data source (multilink), 1129 * match the rate, bps, stream type and increment number of channels. 1130 * 1131 * If rate/bps is zero, it means the values are not set, so skip 1132 * comparison and allow the value to be set and stored in stream 1133 */ 1134 if (stream->params.rate && 1135 stream->params.rate != stream_config->frame_rate) { 1136 dev_err(dev, "rate not matching, stream:%s\n", stream->name); 1137 return -EINVAL; 1138 } 1139 1140 if (stream->params.bps && 1141 stream->params.bps != stream_config->bps) { 1142 dev_err(dev, "bps not matching, stream:%s\n", stream->name); 1143 return -EINVAL; 1144 } 1145 1146 stream->type = stream_config->type; 1147 stream->params.rate = stream_config->frame_rate; 1148 stream->params.bps = stream_config->bps; 1149 1150 /* TODO: Update this check during Device-device support */ 1151 if (is_slave) 1152 stream->params.ch_count += stream_config->ch_count; 1153 1154 return 0; 1155 } 1156 1157 static int sdw_is_valid_port_range(struct device *dev, 1158 struct sdw_port_runtime *p_rt) 1159 { 1160 if (!SDW_VALID_PORT_RANGE(p_rt->num)) { 1161 dev_err(dev, 1162 "SoundWire: Invalid port number :%d\n", p_rt->num); 1163 return -EINVAL; 1164 } 1165 1166 return 0; 1167 } 1168 1169 static struct sdw_port_runtime 1170 *sdw_port_alloc(struct device *dev, 1171 struct sdw_port_config *port_config, 1172 int port_index) 1173 { 1174 struct sdw_port_runtime *p_rt; 1175 1176 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL); 1177 if (!p_rt) 1178 return NULL; 1179 1180 p_rt->ch_mask = port_config[port_index].ch_mask; 1181 p_rt->num = port_config[port_index].num; 1182 1183 return p_rt; 1184 } 1185 1186 static int sdw_master_port_config(struct sdw_bus *bus, 1187 struct sdw_master_runtime *m_rt, 1188 struct sdw_port_config *port_config, 1189 unsigned int num_ports) 1190 { 1191 struct sdw_port_runtime *p_rt; 1192 int i; 1193 1194 /* Iterate for number of ports to perform initialization */ 1195 for (i = 0; i < num_ports; i++) { 1196 p_rt = sdw_port_alloc(bus->dev, port_config, i); 1197 if (!p_rt) 1198 return -ENOMEM; 1199 1200 /* 1201 * TODO: Check port capabilities for requested 1202 * configuration (audio mode support) 1203 */ 1204 1205 list_add_tail(&p_rt->port_node, &m_rt->port_list); 1206 } 1207 1208 return 0; 1209 } 1210 1211 static int sdw_slave_port_config(struct sdw_slave *slave, 1212 struct sdw_slave_runtime *s_rt, 1213 struct sdw_port_config *port_config, 1214 unsigned int num_config) 1215 { 1216 struct sdw_port_runtime *p_rt; 1217 int i, ret; 1218 1219 /* Iterate for number of ports to perform initialization */ 1220 for (i = 0; i < num_config; i++) { 1221 p_rt = sdw_port_alloc(&slave->dev, port_config, i); 1222 if (!p_rt) 1223 return -ENOMEM; 1224 1225 /* 1226 * TODO: Check valid port range as defined by DisCo/ 1227 * slave 1228 */ 1229 ret = sdw_is_valid_port_range(&slave->dev, p_rt); 1230 if (ret < 0) { 1231 kfree(p_rt); 1232 return ret; 1233 } 1234 1235 /* 1236 * TODO: Check port capabilities for requested 1237 * configuration (audio mode support) 1238 */ 1239 1240 list_add_tail(&p_rt->port_node, &s_rt->port_list); 1241 } 1242 1243 return 0; 1244 } 1245 1246 /** 1247 * sdw_stream_add_master() - Allocate and add master runtime to a stream 1248 * 1249 * @bus: SDW Bus instance 1250 * @stream_config: Stream configuration for audio stream 1251 * @port_config: Port configuration for audio stream 1252 * @num_ports: Number of ports 1253 * @stream: SoundWire stream 1254 */ 1255 int sdw_stream_add_master(struct sdw_bus *bus, 1256 struct sdw_stream_config *stream_config, 1257 struct sdw_port_config *port_config, 1258 unsigned int num_ports, 1259 struct sdw_stream_runtime *stream) 1260 { 1261 struct sdw_master_runtime *m_rt = NULL; 1262 int ret; 1263 1264 mutex_lock(&bus->bus_lock); 1265 1266 /* 1267 * For multi link streams, add the second master only if 1268 * the bus supports it. 1269 * Check if bus->multi_link is set 1270 */ 1271 if (!bus->multi_link && stream->m_rt_count > 0) { 1272 dev_err(bus->dev, 1273 "Multilink not supported, link %d\n", bus->link_id); 1274 ret = -EINVAL; 1275 goto unlock; 1276 } 1277 1278 m_rt = sdw_alloc_master_rt(bus, stream_config, stream); 1279 if (!m_rt) { 1280 dev_err(bus->dev, 1281 "Master runtime config failed for stream:%s\n", 1282 stream->name); 1283 ret = -ENOMEM; 1284 goto unlock; 1285 } 1286 1287 ret = sdw_config_stream(bus->dev, stream, stream_config, false); 1288 if (ret) 1289 goto stream_error; 1290 1291 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports); 1292 if (ret) 1293 goto stream_error; 1294 1295 stream->m_rt_count++; 1296 1297 goto unlock; 1298 1299 stream_error: 1300 sdw_release_master_stream(m_rt, stream); 1301 unlock: 1302 mutex_unlock(&bus->bus_lock); 1303 return ret; 1304 } 1305 EXPORT_SYMBOL(sdw_stream_add_master); 1306 1307 /** 1308 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream 1309 * 1310 * @slave: SDW Slave instance 1311 * @stream_config: Stream configuration for audio stream 1312 * @stream: SoundWire stream 1313 * @port_config: Port configuration for audio stream 1314 * @num_ports: Number of ports 1315 * 1316 * It is expected that Slave is added before adding Master 1317 * to the Stream. 1318 * 1319 */ 1320 int sdw_stream_add_slave(struct sdw_slave *slave, 1321 struct sdw_stream_config *stream_config, 1322 struct sdw_port_config *port_config, 1323 unsigned int num_ports, 1324 struct sdw_stream_runtime *stream) 1325 { 1326 struct sdw_slave_runtime *s_rt; 1327 struct sdw_master_runtime *m_rt; 1328 int ret; 1329 1330 mutex_lock(&slave->bus->bus_lock); 1331 1332 /* 1333 * If this API is invoked by Slave first then m_rt is not valid. 1334 * So, allocate m_rt and add Slave to it. 1335 */ 1336 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream); 1337 if (!m_rt) { 1338 dev_err(&slave->dev, 1339 "alloc master runtime failed for stream:%s\n", 1340 stream->name); 1341 ret = -ENOMEM; 1342 goto error; 1343 } 1344 1345 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream); 1346 if (!s_rt) { 1347 dev_err(&slave->dev, 1348 "Slave runtime config failed for stream:%s\n", 1349 stream->name); 1350 ret = -ENOMEM; 1351 goto stream_error; 1352 } 1353 1354 ret = sdw_config_stream(&slave->dev, stream, stream_config, true); 1355 if (ret) 1356 goto stream_error; 1357 1358 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list); 1359 1360 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports); 1361 if (ret) 1362 goto stream_error; 1363 1364 /* 1365 * Change stream state to CONFIGURED on first Slave add. 1366 * Bus is not aware of number of Slave(s) in a stream at this 1367 * point so cannot depend on all Slave(s) to be added in order to 1368 * change stream state to CONFIGURED. 1369 */ 1370 stream->state = SDW_STREAM_CONFIGURED; 1371 goto error; 1372 1373 stream_error: 1374 /* 1375 * we hit error so cleanup the stream, release all Slave(s) and 1376 * Master runtime 1377 */ 1378 sdw_release_master_stream(m_rt, stream); 1379 error: 1380 mutex_unlock(&slave->bus->bus_lock); 1381 return ret; 1382 } 1383 EXPORT_SYMBOL(sdw_stream_add_slave); 1384 1385 /** 1386 * sdw_get_slave_dpn_prop() - Get Slave port capabilities 1387 * 1388 * @slave: Slave handle 1389 * @direction: Data direction. 1390 * @port_num: Port number 1391 */ 1392 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave, 1393 enum sdw_data_direction direction, 1394 unsigned int port_num) 1395 { 1396 struct sdw_dpn_prop *dpn_prop; 1397 u8 num_ports; 1398 int i; 1399 1400 if (direction == SDW_DATA_DIR_TX) { 1401 num_ports = hweight32(slave->prop.source_ports); 1402 dpn_prop = slave->prop.src_dpn_prop; 1403 } else { 1404 num_ports = hweight32(slave->prop.sink_ports); 1405 dpn_prop = slave->prop.sink_dpn_prop; 1406 } 1407 1408 for (i = 0; i < num_ports; i++) { 1409 dpn_prop = &dpn_prop[i]; 1410 1411 if (dpn_prop->num == port_num) 1412 return &dpn_prop[i]; 1413 } 1414 1415 return NULL; 1416 } 1417 1418 /** 1419 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s) 1420 * 1421 * @stream: SoundWire stream 1422 * 1423 * Acquire bus_lock for each of the master runtime(m_rt) part of this 1424 * stream to reconfigure the bus. 1425 * NOTE: This function is called from SoundWire stream ops and is 1426 * expected that a global lock is held before acquiring bus_lock. 1427 */ 1428 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream) 1429 { 1430 struct sdw_master_runtime *m_rt = NULL; 1431 struct sdw_bus *bus = NULL; 1432 1433 /* Iterate for all Master(s) in Master list */ 1434 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1435 bus = m_rt->bus; 1436 1437 mutex_lock(&bus->bus_lock); 1438 } 1439 } 1440 1441 /** 1442 * sdw_release_bus_lock: Release bus lock for all Master runtime(s) 1443 * 1444 * @stream: SoundWire stream 1445 * 1446 * Release the previously held bus_lock after reconfiguring the bus. 1447 * NOTE: This function is called from SoundWire stream ops and is 1448 * expected that a global lock is held before releasing bus_lock. 1449 */ 1450 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream) 1451 { 1452 struct sdw_master_runtime *m_rt = NULL; 1453 struct sdw_bus *bus = NULL; 1454 1455 /* Iterate for all Master(s) in Master list */ 1456 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) { 1457 bus = m_rt->bus; 1458 mutex_unlock(&bus->bus_lock); 1459 } 1460 } 1461 1462 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream) 1463 { 1464 struct sdw_master_runtime *m_rt = NULL; 1465 struct sdw_bus *bus = NULL; 1466 struct sdw_master_prop *prop = NULL; 1467 struct sdw_bus_params params; 1468 int ret; 1469 1470 /* Prepare Master(s) and Slave(s) port(s) associated with stream */ 1471 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1472 bus = m_rt->bus; 1473 prop = &bus->prop; 1474 memcpy(¶ms, &bus->params, sizeof(params)); 1475 1476 /* TODO: Support Asynchronous mode */ 1477 if ((prop->max_freq % stream->params.rate) != 0) { 1478 dev_err(bus->dev, "Async mode not supported\n"); 1479 return -EINVAL; 1480 } 1481 1482 /* Increment cumulative bus bandwidth */ 1483 /* TODO: Update this during Device-Device support */ 1484 bus->params.bandwidth += m_rt->stream->params.rate * 1485 m_rt->ch_count * m_rt->stream->params.bps; 1486 1487 /* Program params */ 1488 ret = sdw_program_params(bus); 1489 if (ret < 0) { 1490 dev_err(bus->dev, "Program params failed: %d\n", ret); 1491 goto restore_params; 1492 } 1493 } 1494 1495 ret = do_bank_switch(stream); 1496 if (ret < 0) { 1497 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1498 goto restore_params; 1499 } 1500 1501 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1502 bus = m_rt->bus; 1503 1504 /* Prepare port(s) on the new clock configuration */ 1505 ret = sdw_prep_deprep_ports(m_rt, true); 1506 if (ret < 0) { 1507 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n", 1508 ret); 1509 return ret; 1510 } 1511 } 1512 1513 stream->state = SDW_STREAM_PREPARED; 1514 1515 return ret; 1516 1517 restore_params: 1518 memcpy(&bus->params, ¶ms, sizeof(params)); 1519 return ret; 1520 } 1521 1522 /** 1523 * sdw_prepare_stream() - Prepare SoundWire stream 1524 * 1525 * @stream: Soundwire stream 1526 * 1527 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1528 */ 1529 int sdw_prepare_stream(struct sdw_stream_runtime *stream) 1530 { 1531 int ret = 0; 1532 1533 if (!stream) { 1534 pr_err("SoundWire: Handle not found for stream\n"); 1535 return -EINVAL; 1536 } 1537 1538 sdw_acquire_bus_lock(stream); 1539 1540 ret = _sdw_prepare_stream(stream); 1541 if (ret < 0) 1542 pr_err("Prepare for stream:%s failed: %d\n", stream->name, ret); 1543 1544 sdw_release_bus_lock(stream); 1545 return ret; 1546 } 1547 EXPORT_SYMBOL(sdw_prepare_stream); 1548 1549 static int _sdw_enable_stream(struct sdw_stream_runtime *stream) 1550 { 1551 struct sdw_master_runtime *m_rt = NULL; 1552 struct sdw_bus *bus = NULL; 1553 int ret; 1554 1555 /* Enable Master(s) and Slave(s) port(s) associated with stream */ 1556 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1557 bus = m_rt->bus; 1558 1559 /* Program params */ 1560 ret = sdw_program_params(bus); 1561 if (ret < 0) { 1562 dev_err(bus->dev, "Program params failed: %d\n", ret); 1563 return ret; 1564 } 1565 1566 /* Enable port(s) */ 1567 ret = sdw_enable_disable_ports(m_rt, true); 1568 if (ret < 0) { 1569 dev_err(bus->dev, 1570 "Enable port(s) failed ret: %d\n", ret); 1571 return ret; 1572 } 1573 } 1574 1575 ret = do_bank_switch(stream); 1576 if (ret < 0) { 1577 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1578 return ret; 1579 } 1580 1581 stream->state = SDW_STREAM_ENABLED; 1582 return 0; 1583 } 1584 1585 /** 1586 * sdw_enable_stream() - Enable SoundWire stream 1587 * 1588 * @stream: Soundwire stream 1589 * 1590 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1591 */ 1592 int sdw_enable_stream(struct sdw_stream_runtime *stream) 1593 { 1594 int ret = 0; 1595 1596 if (!stream) { 1597 pr_err("SoundWire: Handle not found for stream\n"); 1598 return -EINVAL; 1599 } 1600 1601 sdw_acquire_bus_lock(stream); 1602 1603 ret = _sdw_enable_stream(stream); 1604 if (ret < 0) 1605 pr_err("Enable for stream:%s failed: %d\n", stream->name, ret); 1606 1607 sdw_release_bus_lock(stream); 1608 return ret; 1609 } 1610 EXPORT_SYMBOL(sdw_enable_stream); 1611 1612 static int _sdw_disable_stream(struct sdw_stream_runtime *stream) 1613 { 1614 struct sdw_master_runtime *m_rt = NULL; 1615 struct sdw_bus *bus = NULL; 1616 int ret; 1617 1618 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1619 bus = m_rt->bus; 1620 /* Disable port(s) */ 1621 ret = sdw_enable_disable_ports(m_rt, false); 1622 if (ret < 0) { 1623 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1624 return ret; 1625 } 1626 } 1627 stream->state = SDW_STREAM_DISABLED; 1628 1629 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1630 bus = m_rt->bus; 1631 /* Program params */ 1632 ret = sdw_program_params(bus); 1633 if (ret < 0) { 1634 dev_err(bus->dev, "Program params failed: %d\n", ret); 1635 return ret; 1636 } 1637 } 1638 1639 return do_bank_switch(stream); 1640 } 1641 1642 /** 1643 * sdw_disable_stream() - Disable SoundWire stream 1644 * 1645 * @stream: Soundwire stream 1646 * 1647 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1648 */ 1649 int sdw_disable_stream(struct sdw_stream_runtime *stream) 1650 { 1651 int ret = 0; 1652 1653 if (!stream) { 1654 pr_err("SoundWire: Handle not found for stream\n"); 1655 return -EINVAL; 1656 } 1657 1658 sdw_acquire_bus_lock(stream); 1659 1660 ret = _sdw_disable_stream(stream); 1661 if (ret < 0) 1662 pr_err("Disable for stream:%s failed: %d\n", stream->name, ret); 1663 1664 sdw_release_bus_lock(stream); 1665 return ret; 1666 } 1667 EXPORT_SYMBOL(sdw_disable_stream); 1668 1669 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1670 { 1671 struct sdw_master_runtime *m_rt = NULL; 1672 struct sdw_bus *bus = NULL; 1673 int ret = 0; 1674 1675 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1676 bus = m_rt->bus; 1677 /* De-prepare port(s) */ 1678 ret = sdw_prep_deprep_ports(m_rt, false); 1679 if (ret < 0) { 1680 dev_err(bus->dev, 1681 "De-prepare port(s) failed: %d\n", ret); 1682 return ret; 1683 } 1684 1685 /* TODO: Update this during Device-Device support */ 1686 bus->params.bandwidth -= m_rt->stream->params.rate * 1687 m_rt->ch_count * m_rt->stream->params.bps; 1688 1689 /* Program params */ 1690 ret = sdw_program_params(bus); 1691 if (ret < 0) { 1692 dev_err(bus->dev, "Program params failed: %d\n", ret); 1693 return ret; 1694 } 1695 } 1696 1697 stream->state = SDW_STREAM_DEPREPARED; 1698 return do_bank_switch(stream); 1699 } 1700 1701 /** 1702 * sdw_deprepare_stream() - Deprepare SoundWire stream 1703 * 1704 * @stream: Soundwire stream 1705 * 1706 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1707 */ 1708 int sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1709 { 1710 int ret = 0; 1711 1712 if (!stream) { 1713 pr_err("SoundWire: Handle not found for stream\n"); 1714 return -EINVAL; 1715 } 1716 1717 sdw_acquire_bus_lock(stream); 1718 ret = _sdw_deprepare_stream(stream); 1719 if (ret < 0) 1720 pr_err("De-prepare for stream:%d failed: %d\n", ret, ret); 1721 1722 sdw_release_bus_lock(stream); 1723 return ret; 1724 } 1725 EXPORT_SYMBOL(sdw_deprepare_stream); 1726