drivers/soundwire/stream.c

   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 <linux/soundwire/sdw_type.h>
  17 #include <sound/soc.h>
  18 #include "bus.h"
  19
  20 /*
  21  * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
  22  *
  23  * The rows are arranged as per the array index value programmed
  24  * in register. The index 15 has dummy value 0 in order to fill hole.
  25  */
  26 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
  27                         96, 100, 120, 128, 150, 160, 250, 0,
  28                         192, 200, 240, 256, 72, 144, 90, 180};
  29 EXPORT_SYMBOL(sdw_rows);
  30
  31 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
  32 EXPORT_SYMBOL(sdw_cols);
  33
  34 int sdw_find_col_index(int col)
  35 {
  36         int i;
  37
  38         for (i = 0; i < SDW_FRAME_COLS; i++) {
  39                 if (sdw_cols[i] == col)
  40                         return i;
  41         }
  42
  43         pr_warn("Requested column not found, selecting lowest column no: 2\n");
  44         return 0;
  45 }
  46 EXPORT_SYMBOL(sdw_find_col_index);
  47
  48 int sdw_find_row_index(int row)
  49 {
  50         int i;
  51
  52         for (i = 0; i < SDW_FRAME_ROWS; i++) {
  53                 if (sdw_rows[i] == row)
  54                         return i;
  55         }
  56
  57         pr_warn("Requested row not found, selecting lowest row no: 48\n");
  58         return 0;
  59 }
  60 EXPORT_SYMBOL(sdw_find_row_index);
  61
  62 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
  63                                           struct sdw_slave *slave,
  64                                           struct sdw_transport_params *t_params,
  65                                           enum sdw_dpn_type type)
  66 {
  67         u32 addr1, addr2, addr3, addr4;
  68         int ret;
  69         u16 wbuf;
  70
  71         if (bus->params.next_bank) {
  72                 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
  73                 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
  74                 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
  75                 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
  76         } else {
  77                 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
  78                 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
  79                 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
  80                 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
  81         }
  82
  83         /* Program DPN_OffsetCtrl2 registers */
  84         ret = sdw_write_no_pm(slave, addr1, t_params->offset2);
  85         if (ret < 0) {
  86                 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
  87                 return ret;
  88         }
  89
  90         /* Program DPN_BlockCtrl3 register */
  91         ret = sdw_write_no_pm(slave, addr2, t_params->blk_pkg_mode);
  92         if (ret < 0) {
  93                 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
  94                 return ret;
  95         }
  96
  97         /*
  98          * Data ports are FULL, SIMPLE and REDUCED. This function handles
  99          * FULL and REDUCED only and beyond this point only FULL is
 100          * handled, so bail out if we are not FULL data port type
 101          */
 102         if (type != SDW_DPN_FULL)
 103                 return ret;
 104
 105         /* Program DPN_SampleCtrl2 register */
 106         wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
 107
 108         ret = sdw_write_no_pm(slave, addr3, wbuf);
 109         if (ret < 0) {
 110                 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
 111                 return ret;
 112         }
 113
 114         /* Program DPN_HCtrl register */
 115         wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
 116         wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
 117
 118         ret = sdw_write_no_pm(slave, addr4, wbuf);
 119         if (ret < 0)
 120                 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
 121
 122         return ret;
 123 }
 124
 125 static int sdw_program_slave_port_params(struct sdw_bus *bus,
 126                                          struct sdw_slave_runtime *s_rt,
 127                                          struct sdw_port_runtime *p_rt)
 128 {
 129         struct sdw_transport_params *t_params = &p_rt->transport_params;
 130         struct sdw_port_params *p_params = &p_rt->port_params;
 131         struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
 132         u32 addr1, addr2, addr3, addr4, addr5, addr6;
 133         struct sdw_dpn_prop *dpn_prop;
 134         int ret;
 135         u8 wbuf;
 136
 137         if (s_rt->slave->is_mockup_device)
 138                 return 0;
 139
 140         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 141                                           s_rt->direction,
 142                                           t_params->port_num);
 143         if (!dpn_prop)
 144                 return -EINVAL;
 145
 146         addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
 147         addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
 148
 149         if (bus->params.next_bank) {
 150                 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
 151                 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
 152                 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
 153                 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
 154
 155         } else {
 156                 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
 157                 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
 158                 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
 159                 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
 160         }
 161
 162         /* Program DPN_PortCtrl register */
 163         wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
 164         wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
 165
 166         ret = sdw_update_no_pm(s_rt->slave, addr1, 0xF, wbuf);
 167         if (ret < 0) {
 168                 dev_err(&s_rt->slave->dev,
 169                         "DPN_PortCtrl register write failed for port %d\n",
 170                         t_params->port_num);
 171                 return ret;
 172         }
 173
 174         if (!dpn_prop->read_only_wordlength) {
 175                 /* Program DPN_BlockCtrl1 register */
 176                 ret = sdw_write_no_pm(s_rt->slave, addr2, (p_params->bps - 1));
 177                 if (ret < 0) {
 178                         dev_err(&s_rt->slave->dev,
 179                                 "DPN_BlockCtrl1 register write failed for port %d\n",
 180                                 t_params->port_num);
 181                         return ret;
 182                 }
 183         }
 184
 185         /* Program DPN_SampleCtrl1 register */
 186         wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
 187         ret = sdw_write_no_pm(s_rt->slave, addr3, wbuf);
 188         if (ret < 0) {
 189                 dev_err(&s_rt->slave->dev,
 190                         "DPN_SampleCtrl1 register write failed for port %d\n",
 191                         t_params->port_num);
 192                 return ret;
 193         }
 194
 195         /* Program DPN_OffsetCtrl1 registers */
 196         ret = sdw_write_no_pm(s_rt->slave, addr4, t_params->offset1);
 197         if (ret < 0) {
 198                 dev_err(&s_rt->slave->dev,
 199                         "DPN_OffsetCtrl1 register write failed for port %d\n",
 200                         t_params->port_num);
 201                 return ret;
 202         }
 203
 204         /* Program DPN_BlockCtrl2 register*/
 205         if (t_params->blk_grp_ctrl_valid) {
 206                 ret = sdw_write_no_pm(s_rt->slave, addr5, t_params->blk_grp_ctrl);
 207                 if (ret < 0) {
 208                         dev_err(&s_rt->slave->dev,
 209                                 "DPN_BlockCtrl2 reg write failed for port %d\n",
 210                                 t_params->port_num);
 211                         return ret;
 212                 }
 213         }
 214
 215         /* program DPN_LaneCtrl register */
 216         if (slave_prop->lane_control_support) {
 217                 ret = sdw_write_no_pm(s_rt->slave, addr6, t_params->lane_ctrl);
 218                 if (ret < 0) {
 219                         dev_err(&s_rt->slave->dev,
 220                                 "DPN_LaneCtrl register write failed for port %d\n",
 221                                 t_params->port_num);
 222                         return ret;
 223                 }
 224         }
 225
 226         if (dpn_prop->type != SDW_DPN_SIMPLE) {
 227                 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
 228                                                      t_params, dpn_prop->type);
 229                 if (ret < 0)
 230                         dev_err(&s_rt->slave->dev,
 231                                 "Transport reg write failed for port: %d\n",
 232                                 t_params->port_num);
 233         }
 234
 235         return ret;
 236 }
 237
 238 static int sdw_program_master_port_params(struct sdw_bus *bus,
 239                                           struct sdw_port_runtime *p_rt)
 240 {
 241         int ret;
 242
 243         /*
 244          * we need to set transport and port parameters for the port.
 245          * Transport parameters refers to the sample interval, offsets and
 246          * hstart/stop etc of the data. Port parameters refers to word
 247          * length, flow mode etc of the port
 248          */
 249         ret = bus->port_ops->dpn_set_port_transport_params(bus,
 250                                         &p_rt->transport_params,
 251                                         bus->params.next_bank);
 252         if (ret < 0)
 253                 return ret;
 254
 255         return bus->port_ops->dpn_set_port_params(bus,
 256                                                   &p_rt->port_params,
 257                                                   bus->params.next_bank);
 258 }
 259
 260 /**
 261  * sdw_program_port_params() - Programs transport parameters of Master(s)
 262  * and Slave(s)
 263  *
 264  * @m_rt: Master stream runtime
 265  */
 266 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
 267 {
 268         struct sdw_slave_runtime *s_rt;
 269         struct sdw_bus *bus = m_rt->bus;
 270         struct sdw_port_runtime *p_rt;
 271         int ret = 0;
 272
 273         /* Program transport & port parameters for Slave(s) */
 274         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 275                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 276                         ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
 277                         if (ret < 0)
 278                                 return ret;
 279                 }
 280         }
 281
 282         /* Program transport & port parameters for Master(s) */
 283         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 284                 ret = sdw_program_master_port_params(bus, p_rt);
 285                 if (ret < 0)
 286                         return ret;
 287         }
 288
 289         return 0;
 290 }
 291
 292 /**
 293  * sdw_enable_disable_slave_ports: Enable/disable slave data port
 294  *
 295  * @bus: bus instance
 296  * @s_rt: slave runtime
 297  * @p_rt: port runtime
 298  * @en: enable or disable operation
 299  *
 300  * This function only sets the enable/disable bits in the relevant bank, the
 301  * actual enable/disable is done with a bank switch
 302  */
 303 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
 304                                           struct sdw_slave_runtime *s_rt,
 305                                           struct sdw_port_runtime *p_rt,
 306                                           bool en)
 307 {
 308         struct sdw_transport_params *t_params = &p_rt->transport_params;
 309         u32 addr;
 310         int ret;
 311
 312         if (bus->params.next_bank)
 313                 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
 314         else
 315                 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
 316
 317         /*
 318          * Since bus doesn't support sharing a port across two streams,
 319          * it is safe to reset this register
 320          */
 321         if (en)
 322                 ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
 323         else
 324                 ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
 325
 326         if (ret < 0)
 327                 dev_err(&s_rt->slave->dev,
 328                         "Slave chn_en reg write failed:%d port:%d\n",
 329                         ret, t_params->port_num);
 330
 331         return ret;
 332 }
 333
 334 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
 335                                            struct sdw_port_runtime *p_rt,
 336                                            bool en)
 337 {
 338         struct sdw_transport_params *t_params = &p_rt->transport_params;
 339         struct sdw_bus *bus = m_rt->bus;
 340         struct sdw_enable_ch enable_ch;
 341         int ret;
 342
 343         enable_ch.port_num = p_rt->num;
 344         enable_ch.ch_mask = p_rt->ch_mask;
 345         enable_ch.enable = en;
 346
 347         /* Perform Master port channel(s) enable/disable */
 348         if (bus->port_ops->dpn_port_enable_ch) {
 349                 ret = bus->port_ops->dpn_port_enable_ch(bus,
 350                                                         &enable_ch,
 351                                                         bus->params.next_bank);
 352                 if (ret < 0) {
 353                         dev_err(bus->dev,
 354                                 "Master chn_en write failed:%d port:%d\n",
 355                                 ret, t_params->port_num);
 356                         return ret;
 357                 }
 358         } else {
 359                 dev_err(bus->dev,
 360                         "dpn_port_enable_ch not supported, %s failed\n",
 361                         en ? "enable" : "disable");
 362                 return -EINVAL;
 363         }
 364
 365         return 0;
 366 }
 367
 368 /**
 369  * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
 370  * Slave(s)
 371  *
 372  * @m_rt: Master stream runtime
 373  * @en: mode (enable/disable)
 374  */
 375 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
 376 {
 377         struct sdw_port_runtime *s_port, *m_port;
 378         struct sdw_slave_runtime *s_rt;
 379         int ret = 0;
 380
 381         /* Enable/Disable Slave port(s) */
 382         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 383                 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
 384                         ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
 385                                                              s_port, en);
 386                         if (ret < 0)
 387                                 return ret;
 388                 }
 389         }
 390
 391         /* Enable/Disable Master port(s) */
 392         list_for_each_entry(m_port, &m_rt->port_list, port_node) {
 393                 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
 394                 if (ret < 0)
 395                         return ret;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
 402                             struct sdw_prepare_ch prep_ch,
 403                             enum sdw_port_prep_ops cmd)
 404 {
 405         int ret = 0;
 406         struct sdw_slave *slave = s_rt->slave;
 407
 408         mutex_lock(&slave->sdw_dev_lock);
 409
 410         if (slave->probed) {
 411                 struct device *dev = &slave->dev;
 412                 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 413
 414                 if (drv->ops && drv->ops->port_prep) {
 415                         ret = drv->ops->port_prep(slave, &prep_ch, cmd);
 416                         if (ret < 0)
 417                                 dev_err(dev, "Slave Port Prep cmd %d failed: %d\n",
 418                                         cmd, ret);
 419                 }
 420         }
 421
 422         mutex_unlock(&slave->sdw_dev_lock);
 423
 424         return ret;
 425 }
 426
 427 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 428                                        struct sdw_slave_runtime *s_rt,
 429                                        struct sdw_port_runtime *p_rt,
 430                                        bool prep)
 431 {
 432         struct completion *port_ready;
 433         struct sdw_dpn_prop *dpn_prop;
 434         struct sdw_prepare_ch prep_ch;
 435         bool intr = false;
 436         int ret = 0, val;
 437         u32 addr;
 438
 439         prep_ch.num = p_rt->num;
 440         prep_ch.ch_mask = p_rt->ch_mask;
 441
 442         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 443                                           s_rt->direction,
 444                                           prep_ch.num);
 445         if (!dpn_prop) {
 446                 dev_err(bus->dev,
 447                         "Slave Port:%d properties not found\n", prep_ch.num);
 448                 return -EINVAL;
 449         }
 450
 451         prep_ch.prepare = prep;
 452
 453         prep_ch.bank = bus->params.next_bank;
 454
 455         if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
 456             bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
 457                 intr = true;
 458
 459         /*
 460          * Enable interrupt before Port prepare.
 461          * For Port de-prepare, it is assumed that port
 462          * was prepared earlier
 463          */
 464         if (prep && intr) {
 465                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 466                                              dpn_prop->imp_def_interrupts);
 467                 if (ret < 0)
 468                         return ret;
 469         }
 470
 471         /* Inform slave about the impending port prepare */
 472         sdw_do_port_prep(s_rt, prep_ch, prep ? SDW_OPS_PORT_PRE_PREP : SDW_OPS_PORT_PRE_DEPREP);
 473
 474         /* Prepare Slave port implementing CP_SM */
 475         if (!dpn_prop->simple_ch_prep_sm) {
 476                 addr = SDW_DPN_PREPARECTRL(p_rt->num);
 477
 478                 if (prep)
 479                         ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
 480                 else
 481                         ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
 482
 483                 if (ret < 0) {
 484                         dev_err(&s_rt->slave->dev,
 485                                 "Slave prep_ctrl reg write failed\n");
 486                         return ret;
 487                 }
 488
 489                 /* Wait for completion on port ready */
 490                 port_ready = &s_rt->slave->port_ready[prep_ch.num];
 491                 wait_for_completion_timeout(port_ready,
 492                         msecs_to_jiffies(dpn_prop->ch_prep_timeout));
 493
 494                 val = sdw_read_no_pm(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
 495                 if ((val < 0) || (val & p_rt->ch_mask)) {
 496                         ret = (val < 0) ? val : -ETIMEDOUT;
 497                         dev_err(&s_rt->slave->dev,
 498                                 "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
 499                         return ret;
 500                 }
 501         }
 502
 503         /* Inform slaves about ports prepared */
 504         sdw_do_port_prep(s_rt, prep_ch, prep ? SDW_OPS_PORT_POST_PREP : SDW_OPS_PORT_POST_DEPREP);
 505
 506         /* Disable interrupt after Port de-prepare */
 507         if (!prep && intr)
 508                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 509                                              dpn_prop->imp_def_interrupts);
 510
 511         return ret;
 512 }
 513
 514 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
 515                                         struct sdw_port_runtime *p_rt,
 516                                         bool prep)
 517 {
 518         struct sdw_transport_params *t_params = &p_rt->transport_params;
 519         struct sdw_bus *bus = m_rt->bus;
 520         const struct sdw_master_port_ops *ops = bus->port_ops;
 521         struct sdw_prepare_ch prep_ch;
 522         int ret = 0;
 523
 524         prep_ch.num = p_rt->num;
 525         prep_ch.ch_mask = p_rt->ch_mask;
 526         prep_ch.prepare = prep; /* Prepare/De-prepare */
 527         prep_ch.bank = bus->params.next_bank;
 528
 529         /* Pre-prepare/Pre-deprepare port(s) */
 530         if (ops->dpn_port_prep) {
 531                 ret = ops->dpn_port_prep(bus, &prep_ch);
 532                 if (ret < 0) {
 533                         dev_err(bus->dev, "Port prepare failed for port:%d\n",
 534                                 t_params->port_num);
 535                         return ret;
 536                 }
 537         }
 538
 539         return ret;
 540 }
 541
 542 /**
 543  * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
 544  * Slave(s)
 545  *
 546  * @m_rt: Master runtime handle
 547  * @prep: Prepare or De-prepare
 548  */
 549 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
 550 {
 551         struct sdw_slave_runtime *s_rt;
 552         struct sdw_port_runtime *p_rt;
 553         int ret = 0;
 554
 555         /* Prepare/De-prepare Slave port(s) */
 556         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 557                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 558                         ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
 559                                                           p_rt, prep);
 560                         if (ret < 0)
 561                                 return ret;
 562                 }
 563         }
 564
 565         /* Prepare/De-prepare Master port(s) */
 566         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 567                 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
 568                 if (ret < 0)
 569                         return ret;
 570         }
 571
 572         return ret;
 573 }
 574
 575 /**
 576  * sdw_notify_config() - Notify bus configuration
 577  *
 578  * @m_rt: Master runtime handle
 579  *
 580  * This function notifies the Master(s) and Slave(s) of the
 581  * new bus configuration.
 582  */
 583 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
 584 {
 585         struct sdw_slave_runtime *s_rt;
 586         struct sdw_bus *bus = m_rt->bus;
 587         struct sdw_slave *slave;
 588         int ret;
 589
 590         if (bus->ops->set_bus_conf) {
 591                 ret = bus->ops->set_bus_conf(bus, &bus->params);
 592                 if (ret < 0)
 593                         return ret;
 594         }
 595
 596         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 597                 slave = s_rt->slave;
 598
 599                 mutex_lock(&slave->sdw_dev_lock);
 600
 601                 if (slave->probed) {
 602                         struct device *dev = &slave->dev;
 603                         struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 604
 605                         if (drv->ops && drv->ops->bus_config) {
 606                                 ret = drv->ops->bus_config(slave, &bus->params);
 607                                 if (ret < 0) {
 608                                         dev_err(dev, "Notify Slave: %d failed\n",
 609                                                 slave->dev_num);
 610                                         mutex_unlock(&slave->sdw_dev_lock);
 611                                         return ret;
 612                                 }
 613                         }
 614                 }
 615
 616                 mutex_unlock(&slave->sdw_dev_lock);
 617         }
 618
 619         return 0;
 620 }
 621
 622 /**
 623  * sdw_program_params() - Program transport and port parameters for Master(s)
 624  * and Slave(s)
 625  *
 626  * @bus: SDW bus instance
 627  * @prepare: true if sdw_program_params() is called by _prepare.
 628  */
 629 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
 630 {
 631         struct sdw_master_runtime *m_rt;
 632         int ret = 0;
 633
 634         list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 635
 636                 /*
 637                  * this loop walks through all master runtimes for a
 638                  * bus, but the ports can only be configured while
 639                  * explicitly preparing a stream or handling an
 640                  * already-prepared stream otherwise.
 641                  */
 642                 if (!prepare &&
 643                     m_rt->stream->state == SDW_STREAM_CONFIGURED)
 644                         continue;
 645
 646                 ret = sdw_program_port_params(m_rt);
 647                 if (ret < 0) {
 648                         dev_err(bus->dev,
 649                                 "Program transport params failed: %d\n", ret);
 650                         return ret;
 651                 }
 652
 653                 ret = sdw_notify_config(m_rt);
 654                 if (ret < 0) {
 655                         dev_err(bus->dev,
 656                                 "Notify bus config failed: %d\n", ret);
 657                         return ret;
 658                 }
 659
 660                 /* Enable port(s) on alternate bank for all active streams */
 661                 if (m_rt->stream->state != SDW_STREAM_ENABLED)
 662                         continue;
 663
 664                 ret = sdw_enable_disable_ports(m_rt, true);
 665                 if (ret < 0) {
 666                         dev_err(bus->dev, "Enable channel failed: %d\n", ret);
 667                         return ret;
 668                 }
 669         }
 670
 671         return ret;
 672 }
 673
 674 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 675 {
 676         int col_index, row_index;
 677         bool multi_link;
 678         struct sdw_msg *wr_msg;
 679         u8 *wbuf;
 680         int ret;
 681         u16 addr;
 682
 683         wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
 684         if (!wr_msg)
 685                 return -ENOMEM;
 686
 687         wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
 688         if (!wbuf) {
 689                 ret = -ENOMEM;
 690                 goto error_1;
 691         }
 692
 693         /* Get row and column index to program register */
 694         col_index = sdw_find_col_index(bus->params.col);
 695         row_index = sdw_find_row_index(bus->params.row);
 696         wbuf[0] = col_index | (row_index << 3);
 697
 698         if (bus->params.next_bank)
 699                 addr = SDW_SCP_FRAMECTRL_B1;
 700         else
 701                 addr = SDW_SCP_FRAMECTRL_B0;
 702
 703         sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
 704                      SDW_MSG_FLAG_WRITE, wbuf);
 705         wr_msg->ssp_sync = true;
 706
 707         /*
 708          * Set the multi_link flag only when both the hardware supports
 709          * and hardware-based sync is required
 710          */
 711         multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
 712
 713         if (multi_link)
 714                 ret = sdw_transfer_defer(bus, wr_msg);
 715         else
 716                 ret = sdw_transfer(bus, wr_msg);
 717
 718         if (ret < 0 && ret != -ENODATA) {
 719                 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
 720                 goto error;
 721         }
 722
 723         if (!multi_link) {
 724                 kfree(wbuf);
 725                 kfree(wr_msg);
 726                 bus->defer_msg.msg = NULL;
 727                 bus->params.curr_bank = !bus->params.curr_bank;
 728                 bus->params.next_bank = !bus->params.next_bank;
 729         }
 730
 731         return 0;
 732
 733 error:
 734         kfree(wbuf);
 735 error_1:
 736         kfree(wr_msg);
 737         bus->defer_msg.msg = NULL;
 738         return ret;
 739 }
 740
 741 /**
 742  * sdw_ml_sync_bank_switch: Multilink register bank switch
 743  *
 744  * @bus: SDW bus instance
 745  *
 746  * Caller function should free the buffers on error
 747  */
 748 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
 749 {
 750         unsigned long time_left;
 751
 752         if (!bus->multi_link)
 753                 return 0;
 754
 755         /* Wait for completion of transfer */
 756         time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 757                                                 bus->bank_switch_timeout);
 758
 759         if (!time_left) {
 760                 dev_err(bus->dev, "Controller Timed out on bank switch\n");
 761                 return -ETIMEDOUT;
 762         }
 763
 764         bus->params.curr_bank = !bus->params.curr_bank;
 765         bus->params.next_bank = !bus->params.next_bank;
 766
 767         if (bus->defer_msg.msg) {
 768                 kfree(bus->defer_msg.msg->buf);
 769                 kfree(bus->defer_msg.msg);
 770                 bus->defer_msg.msg = NULL;
 771         }
 772
 773         return 0;
 774 }
 775
 776 static int do_bank_switch(struct sdw_stream_runtime *stream)
 777 {
 778         struct sdw_master_runtime *m_rt;
 779         const struct sdw_master_ops *ops;
 780         struct sdw_bus *bus;
 781         bool multi_link = false;
 782         int m_rt_count;
 783         int ret = 0;
 784
 785         m_rt_count = stream->m_rt_count;
 786
 787         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 788                 bus = m_rt->bus;
 789                 ops = bus->ops;
 790
 791                 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
 792                         multi_link = true;
 793                         mutex_lock(&bus->msg_lock);
 794                 }
 795
 796                 /* Pre-bank switch */
 797                 if (ops->pre_bank_switch) {
 798                         ret = ops->pre_bank_switch(bus);
 799                         if (ret < 0) {
 800                                 dev_err(bus->dev,
 801                                         "Pre bank switch op failed: %d\n", ret);
 802                                 goto msg_unlock;
 803                         }
 804                 }
 805
 806                 /*
 807                  * Perform Bank switch operation.
 808                  * For multi link cases, the actual bank switch is
 809                  * synchronized across all Masters and happens later as a
 810                  * part of post_bank_switch ops.
 811                  */
 812                 ret = sdw_bank_switch(bus, m_rt_count);
 813                 if (ret < 0) {
 814                         dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 815                         goto error;
 816                 }
 817         }
 818
 819         /*
 820          * For multi link cases, it is expected that the bank switch is
 821          * triggered by the post_bank_switch for the first Master in the list
 822          * and for the other Masters the post_bank_switch() should return doing
 823          * nothing.
 824          */
 825         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 826                 bus = m_rt->bus;
 827                 ops = bus->ops;
 828
 829                 /* Post-bank switch */
 830                 if (ops->post_bank_switch) {
 831                         ret = ops->post_bank_switch(bus);
 832                         if (ret < 0) {
 833                                 dev_err(bus->dev,
 834                                         "Post bank switch op failed: %d\n",
 835                                         ret);
 836                                 goto error;
 837                         }
 838                 } else if (multi_link) {
 839                         dev_err(bus->dev,
 840                                 "Post bank switch ops not implemented\n");
 841                         ret = -EINVAL;
 842                         goto error;
 843                 }
 844
 845                 /* Set the bank switch timeout to default, if not set */
 846                 if (!bus->bank_switch_timeout)
 847                         bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 848
 849                 /* Check if bank switch was successful */
 850                 ret = sdw_ml_sync_bank_switch(bus);
 851                 if (ret < 0) {
 852                         dev_err(bus->dev,
 853                                 "multi link bank switch failed: %d\n", ret);
 854                         goto error;
 855                 }
 856
 857                 if (multi_link)
 858                         mutex_unlock(&bus->msg_lock);
 859         }
 860
 861         return ret;
 862
 863 error:
 864         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 865                 bus = m_rt->bus;
 866                 if (bus->defer_msg.msg) {
 867                         kfree(bus->defer_msg.msg->buf);
 868                         kfree(bus->defer_msg.msg);
 869                         bus->defer_msg.msg = NULL;
 870                 }
 871         }
 872
 873 msg_unlock:
 874
 875         if (multi_link) {
 876                 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 877                         bus = m_rt->bus;
 878                         if (mutex_is_locked(&bus->msg_lock))
 879                                 mutex_unlock(&bus->msg_lock);
 880                 }
 881         }
 882
 883         return ret;
 884 }
 885
 886 static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
 887 {
 888         struct sdw_port_runtime *p_rt;
 889
 890         p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
 891         if (!p_rt)
 892                 return NULL;
 893
 894         list_add_tail(&p_rt->port_node, port_list);
 895
 896         return p_rt;
 897 }
 898
 899 static int sdw_port_config(struct sdw_port_runtime *p_rt,
 900                            struct sdw_port_config *port_config,
 901                            int port_index)
 902 {
 903         p_rt->ch_mask = port_config[port_index].ch_mask;
 904         p_rt->num = port_config[port_index].num;
 905
 906         /*
 907          * TODO: Check port capabilities for requested configuration
 908          */
 909
 910         return 0;
 911 }
 912
 913 static void sdw_port_free(struct sdw_port_runtime *p_rt)
 914 {
 915         list_del(&p_rt->port_node);
 916         kfree(p_rt);
 917 }
 918
 919 static bool sdw_slave_port_allocated(struct sdw_slave_runtime *s_rt)
 920 {
 921         return !list_empty(&s_rt->port_list);
 922 }
 923
 924 static void sdw_slave_port_free(struct sdw_slave *slave,
 925                                 struct sdw_stream_runtime *stream)
 926 {
 927         struct sdw_port_runtime *p_rt, *_p_rt;
 928         struct sdw_master_runtime *m_rt;
 929         struct sdw_slave_runtime *s_rt;
 930
 931         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 932                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 933                         if (s_rt->slave != slave)
 934                                 continue;
 935
 936                         list_for_each_entry_safe(p_rt, _p_rt,
 937                                                  &s_rt->port_list, port_node) {
 938                                 sdw_port_free(p_rt);
 939                         }
 940                 }
 941         }
 942 }
 943
 944 static int sdw_slave_port_alloc(struct sdw_slave *slave,
 945                                 struct sdw_slave_runtime *s_rt,
 946                                 unsigned int num_config)
 947 {
 948         struct sdw_port_runtime *p_rt;
 949         int i;
 950
 951         /* Iterate for number of ports to perform initialization */
 952         for (i = 0; i < num_config; i++) {
 953                 p_rt = sdw_port_alloc(&s_rt->port_list);
 954                 if (!p_rt)
 955                         return -ENOMEM;
 956         }
 957
 958         return 0;
 959 }
 960
 961 static int sdw_slave_port_is_valid_range(struct device *dev, int num)
 962 {
 963         if (!SDW_VALID_PORT_RANGE(num)) {
 964                 dev_err(dev, "SoundWire: Invalid port number :%d\n", num);
 965                 return -EINVAL;
 966         }
 967
 968         return 0;
 969 }
 970
 971 static int sdw_slave_port_config(struct sdw_slave *slave,
 972                                  struct sdw_slave_runtime *s_rt,
 973                                  struct sdw_port_config *port_config)
 974 {
 975         struct sdw_port_runtime *p_rt;
 976         int ret;
 977         int i;
 978
 979         i = 0;
 980         list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 981                 /*
 982                  * TODO: Check valid port range as defined by DisCo/
 983                  * slave
 984                  */
 985                 ret = sdw_slave_port_is_valid_range(&slave->dev, port_config[i].num);
 986                 if (ret < 0)
 987                         return ret;
 988
 989                 ret = sdw_port_config(p_rt, port_config, i);
 990                 if (ret < 0)
 991                         return ret;
 992                 i++;
 993         }
 994
 995         return 0;
 996 }
 997
 998 static bool sdw_master_port_allocated(struct sdw_master_runtime *m_rt)
 999 {
1000         return !list_empty(&m_rt->port_list);
1001 }
1002
1003 static void sdw_master_port_free(struct sdw_master_runtime *m_rt)
1004 {
1005         struct sdw_port_runtime *p_rt, *_p_rt;
1006
1007         list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1008                 sdw_port_free(p_rt);
1009         }
1010 }
1011
1012 static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
1013                                  unsigned int num_ports)
1014 {
1015         struct sdw_port_runtime *p_rt;
1016         int i;
1017
1018         /* Iterate for number of ports to perform initialization */
1019         for (i = 0; i < num_ports; i++) {
1020                 p_rt = sdw_port_alloc(&m_rt->port_list);
1021                 if (!p_rt)
1022                         return -ENOMEM;
1023         }
1024
1025         return 0;
1026 }
1027
1028 static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
1029                                   struct sdw_port_config *port_config)
1030 {
1031         struct sdw_port_runtime *p_rt;
1032         int ret;
1033         int i;
1034
1035         i = 0;
1036         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1037                 ret = sdw_port_config(p_rt, port_config, i);
1038                 if (ret < 0)
1039                         return ret;
1040                 i++;
1041         }
1042
1043         return 0;
1044 }
1045
1046 /**
1047  * sdw_slave_rt_alloc() - Allocate a Slave runtime handle.
1048  *
1049  * @slave: Slave handle
1050  * @m_rt: Master runtime handle
1051  *
1052  * This function is to be called with bus_lock held.
1053  */
1054 static struct sdw_slave_runtime
1055 *sdw_slave_rt_alloc(struct sdw_slave *slave,
1056                     struct sdw_master_runtime *m_rt)
1057 {
1058         struct sdw_slave_runtime *s_rt;
1059
1060         s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1061         if (!s_rt)
1062                 return NULL;
1063
1064         INIT_LIST_HEAD(&s_rt->port_list);
1065         s_rt->slave = slave;
1066
1067         list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1068
1069         return s_rt;
1070 }
1071
1072 /**
1073  * sdw_slave_rt_config() - Configure a Slave runtime handle.
1074  *
1075  * @s_rt: Slave runtime handle
1076  * @stream_config: Stream configuration
1077  *
1078  * This function is to be called with bus_lock held.
1079  */
1080 static int sdw_slave_rt_config(struct sdw_slave_runtime *s_rt,
1081                                struct sdw_stream_config *stream_config)
1082 {
1083         s_rt->ch_count = stream_config->ch_count;
1084         s_rt->direction = stream_config->direction;
1085
1086         return 0;
1087 }
1088
1089 static struct sdw_slave_runtime *sdw_slave_rt_find(struct sdw_slave *slave,
1090                                                    struct sdw_stream_runtime *stream)
1091 {
1092         struct sdw_slave_runtime *s_rt, *_s_rt;
1093         struct sdw_master_runtime *m_rt;
1094
1095         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1096                 /* Retrieve Slave runtime handle */
1097                 list_for_each_entry_safe(s_rt, _s_rt,
1098                                          &m_rt->slave_rt_list, m_rt_node) {
1099                         if (s_rt->slave == slave)
1100                                 return s_rt;
1101                 }
1102         }
1103         return NULL;
1104 }
1105
1106 /**
1107  * sdw_slave_rt_free() - Free Slave(s) runtime handle
1108  *
1109  * @slave: Slave handle.
1110  * @stream: Stream runtime handle.
1111  *
1112  * This function is to be called with bus_lock held.
1113  */
1114 static void sdw_slave_rt_free(struct sdw_slave *slave,
1115                               struct sdw_stream_runtime *stream)
1116 {
1117         struct sdw_slave_runtime *s_rt;
1118
1119         s_rt = sdw_slave_rt_find(slave, stream);
1120         if (s_rt) {
1121                 list_del(&s_rt->m_rt_node);
1122                 kfree(s_rt);
1123         }
1124 }
1125
1126 static struct sdw_master_runtime
1127 *sdw_master_rt_find(struct sdw_bus *bus,
1128                     struct sdw_stream_runtime *stream)
1129 {
1130         struct sdw_master_runtime *m_rt;
1131
1132         /* Retrieve Bus handle if already available */
1133         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1134                 if (m_rt->bus == bus)
1135                         return m_rt;
1136         }
1137
1138         return NULL;
1139 }
1140
1141 /**
1142  * sdw_master_rt_alloc() - Allocates a Master runtime handle
1143  *
1144  * @bus: SDW bus instance
1145  * @stream: Stream runtime handle.
1146  *
1147  * This function is to be called with bus_lock held.
1148  */
1149 static struct sdw_master_runtime
1150 *sdw_master_rt_alloc(struct sdw_bus *bus,
1151                      struct sdw_stream_runtime *stream)
1152 {
1153         struct sdw_master_runtime *m_rt, *walk_m_rt;
1154         struct list_head *insert_after;
1155
1156         m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
1157         if (!m_rt)
1158                 return NULL;
1159
1160         /* Initialization of Master runtime handle */
1161         INIT_LIST_HEAD(&m_rt->port_list);
1162         INIT_LIST_HEAD(&m_rt->slave_rt_list);
1163
1164         /*
1165          * Add in order of bus id so that when taking the bus_lock
1166          * of multiple buses they will always be taken in the same
1167          * order to prevent a mutex deadlock.
1168          */
1169         insert_after = &stream->master_list;
1170         list_for_each_entry_reverse(walk_m_rt, &stream->master_list, stream_node) {
1171                 if (walk_m_rt->bus->id < bus->id) {
1172                         insert_after = &walk_m_rt->stream_node;
1173                         break;
1174                 }
1175         }
1176         list_add(&m_rt->stream_node, insert_after);
1177
1178         list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
1179
1180         m_rt->bus = bus;
1181         m_rt->stream = stream;
1182
1183         return m_rt;
1184 }
1185
1186 /**
1187  * sdw_master_rt_config() - Configure Master runtime handle
1188  *
1189  * @m_rt: Master runtime handle
1190  * @stream_config: Stream configuration
1191  *
1192  * This function is to be called with bus_lock held.
1193  */
1194
1195 static int sdw_master_rt_config(struct sdw_master_runtime *m_rt,
1196                                 struct sdw_stream_config *stream_config)
1197 {
1198         m_rt->ch_count = stream_config->ch_count;
1199         m_rt->direction = stream_config->direction;
1200
1201         return 0;
1202 }
1203
1204 /**
1205  * sdw_master_rt_free() - Free Master runtime handle
1206  *
1207  * @m_rt: Master runtime node
1208  * @stream: Stream runtime handle.
1209  *
1210  * This function is to be called with bus_lock held
1211  * It frees the Master runtime handle and associated Slave(s) runtime
1212  * handle. If this is called first then sdw_slave_rt_free() will have
1213  * no effect as Slave(s) runtime handle would already be freed up.
1214  */
1215 static void sdw_master_rt_free(struct sdw_master_runtime *m_rt,
1216                                struct sdw_stream_runtime *stream)
1217 {
1218         struct sdw_slave_runtime *s_rt, *_s_rt;
1219
1220         list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1221                 sdw_slave_port_free(s_rt->slave, stream);
1222                 sdw_slave_rt_free(s_rt->slave, stream);
1223         }
1224
1225         list_del(&m_rt->stream_node);
1226         list_del(&m_rt->bus_node);
1227         kfree(m_rt);
1228 }
1229
1230 /**
1231  * sdw_config_stream() - Configure the allocated stream
1232  *
1233  * @dev: SDW device
1234  * @stream: SoundWire stream
1235  * @stream_config: Stream configuration for audio stream
1236  * @is_slave: is API called from Slave or Master
1237  *
1238  * This function is to be called with bus_lock held.
1239  */
1240 static int sdw_config_stream(struct device *dev,
1241                              struct sdw_stream_runtime *stream,
1242                              struct sdw_stream_config *stream_config,
1243                              bool is_slave)
1244 {
1245         /*
1246          * Update the stream rate, channel and bps based on data
1247          * source. For more than one data source (multilink),
1248          * match the rate, bps, stream type and increment number of channels.
1249          *
1250          * If rate/bps is zero, it means the values are not set, so skip
1251          * comparison and allow the value to be set and stored in stream
1252          */
1253         if (stream->params.rate &&
1254             stream->params.rate != stream_config->frame_rate) {
1255                 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1256                 return -EINVAL;
1257         }
1258
1259         if (stream->params.bps &&
1260             stream->params.bps != stream_config->bps) {
1261                 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1262                 return -EINVAL;
1263         }
1264
1265         stream->type = stream_config->type;
1266         stream->params.rate = stream_config->frame_rate;
1267         stream->params.bps = stream_config->bps;
1268
1269         /* TODO: Update this check during Device-device support */
1270         if (is_slave)
1271                 stream->params.ch_count += stream_config->ch_count;
1272
1273         return 0;
1274 }
1275
1276 /**
1277  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1278  *
1279  * @slave: Slave handle
1280  * @direction: Data direction.
1281  * @port_num: Port number
1282  */
1283 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1284                                             enum sdw_data_direction direction,
1285                                             unsigned int port_num)
1286 {
1287         struct sdw_dpn_prop *dpn_prop;
1288         u8 num_ports;
1289         int i;
1290
1291         if (direction == SDW_DATA_DIR_TX) {
1292                 num_ports = hweight32(slave->prop.source_ports);
1293                 dpn_prop = slave->prop.src_dpn_prop;
1294         } else {
1295                 num_ports = hweight32(slave->prop.sink_ports);
1296                 dpn_prop = slave->prop.sink_dpn_prop;
1297         }
1298
1299         for (i = 0; i < num_ports; i++) {
1300                 if (dpn_prop[i].num == port_num)
1301                         return &dpn_prop[i];
1302         }
1303
1304         return NULL;
1305 }
1306
1307 /**
1308  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1309  *
1310  * @stream: SoundWire stream
1311  *
1312  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1313  * stream to reconfigure the bus.
1314  * NOTE: This function is called from SoundWire stream ops and is
1315  * expected that a global lock is held before acquiring bus_lock.
1316  */
1317 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1318 {
1319         struct sdw_master_runtime *m_rt;
1320         struct sdw_bus *bus;
1321
1322         /* Iterate for all Master(s) in Master list */
1323         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1324                 bus = m_rt->bus;
1325
1326                 mutex_lock(&bus->bus_lock);
1327         }
1328 }
1329
1330 /**
1331  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1332  *
1333  * @stream: SoundWire stream
1334  *
1335  * Release the previously held bus_lock after reconfiguring the bus.
1336  * NOTE: This function is called from SoundWire stream ops and is
1337  * expected that a global lock is held before releasing bus_lock.
1338  */
1339 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1340 {
1341         struct sdw_master_runtime *m_rt;
1342         struct sdw_bus *bus;
1343
1344         /* Iterate for all Master(s) in Master list */
1345         list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1346                 bus = m_rt->bus;
1347                 mutex_unlock(&bus->bus_lock);
1348         }
1349 }
1350
1351 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1352                                bool update_params)
1353 {
1354         struct sdw_master_runtime *m_rt;
1355         struct sdw_bus *bus;
1356         struct sdw_master_prop *prop;
1357         struct sdw_bus_params params;
1358         int ret;
1359
1360         /* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1361         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1362                 bus = m_rt->bus;
1363                 prop = &bus->prop;
1364                 memcpy(&params, &bus->params, sizeof(params));
1365
1366                 /* TODO: Support Asynchronous mode */
1367                 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1368                         dev_err(bus->dev, "Async mode not supported\n");
1369                         return -EINVAL;
1370                 }
1371
1372                 if (update_params) {
1373                         /* Increment cumulative bus bandwidth */
1374                         /* TODO: Update this during Device-Device support */
1375                         bus->params.bandwidth += m_rt->stream->params.rate *
1376                                 m_rt->ch_count * m_rt->stream->params.bps;
1377
1378                         /* Compute params */
1379                         if (bus->compute_params) {
1380                                 ret = bus->compute_params(bus);
1381                                 if (ret < 0) {
1382                                         dev_err(bus->dev, "Compute params failed: %d\n",
1383                                                 ret);
1384                                         goto restore_params;
1385                                 }
1386                         }
1387                 }
1388
1389                 /* Program params */
1390                 ret = sdw_program_params(bus, true);
1391                 if (ret < 0) {
1392                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1393                         goto restore_params;
1394                 }
1395         }
1396
1397         ret = do_bank_switch(stream);
1398         if (ret < 0) {
1399                 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1400                 goto restore_params;
1401         }
1402
1403         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1404                 bus = m_rt->bus;
1405
1406                 /* Prepare port(s) on the new clock configuration */
1407                 ret = sdw_prep_deprep_ports(m_rt, true);
1408                 if (ret < 0) {
1409                         dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1410                                 ret);
1411                         return ret;
1412                 }
1413         }
1414
1415         stream->state = SDW_STREAM_PREPARED;
1416
1417         return ret;
1418
1419 restore_params:
1420         memcpy(&bus->params, &params, sizeof(params));
1421         return ret;
1422 }
1423
1424 /**
1425  * sdw_prepare_stream() - Prepare SoundWire stream
1426  *
1427  * @stream: Soundwire stream
1428  *
1429  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1430  */
1431 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1432 {
1433         bool update_params = true;
1434         int ret;
1435
1436         if (!stream) {
1437                 pr_err("SoundWire: Handle not found for stream\n");
1438                 return -EINVAL;
1439         }
1440
1441         sdw_acquire_bus_lock(stream);
1442
1443         if (stream->state == SDW_STREAM_PREPARED) {
1444                 ret = 0;
1445                 goto state_err;
1446         }
1447
1448         if (stream->state != SDW_STREAM_CONFIGURED &&
1449             stream->state != SDW_STREAM_DEPREPARED &&
1450             stream->state != SDW_STREAM_DISABLED) {
1451                 pr_err("%s: %s: inconsistent state state %d\n",
1452                        __func__, stream->name, stream->state);
1453                 ret = -EINVAL;
1454                 goto state_err;
1455         }
1456
1457         /*
1458          * when the stream is DISABLED, this means sdw_prepare_stream()
1459          * is called as a result of an underflow or a resume operation.
1460          * In this case, the bus parameters shall not be recomputed, but
1461          * still need to be re-applied
1462          */
1463         if (stream->state == SDW_STREAM_DISABLED)
1464                 update_params = false;
1465
1466         ret = _sdw_prepare_stream(stream, update_params);
1467
1468 state_err:
1469         sdw_release_bus_lock(stream);
1470         return ret;
1471 }
1472 EXPORT_SYMBOL(sdw_prepare_stream);
1473
1474 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1475 {
1476         struct sdw_master_runtime *m_rt;
1477         struct sdw_bus *bus;
1478         int ret;
1479
1480         /* Enable Master(s) and Slave(s) port(s) associated with stream */
1481         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1482                 bus = m_rt->bus;
1483
1484                 /* Program params */
1485                 ret = sdw_program_params(bus, false);
1486                 if (ret < 0) {
1487                         dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1488                         return ret;
1489                 }
1490
1491                 /* Enable port(s) */
1492                 ret = sdw_enable_disable_ports(m_rt, true);
1493                 if (ret < 0) {
1494                         dev_err(bus->dev,
1495                                 "Enable port(s) failed ret: %d\n", ret);
1496                         return ret;
1497                 }
1498         }
1499
1500         ret = do_bank_switch(stream);
1501         if (ret < 0) {
1502                 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1503                 return ret;
1504         }
1505
1506         stream->state = SDW_STREAM_ENABLED;
1507         return 0;
1508 }
1509
1510 /**
1511  * sdw_enable_stream() - Enable SoundWire stream
1512  *
1513  * @stream: Soundwire stream
1514  *
1515  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1516  */
1517 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1518 {
1519         int ret;
1520
1521         if (!stream) {
1522                 pr_err("SoundWire: Handle not found for stream\n");
1523                 return -EINVAL;
1524         }
1525
1526         sdw_acquire_bus_lock(stream);
1527
1528         if (stream->state == SDW_STREAM_ENABLED) {
1529                 ret = 0;
1530                 goto state_err;
1531         }
1532
1533         if (stream->state != SDW_STREAM_PREPARED &&
1534             stream->state != SDW_STREAM_DISABLED) {
1535                 pr_err("%s: %s: inconsistent state state %d\n",
1536                        __func__, stream->name, stream->state);
1537                 ret = -EINVAL;
1538                 goto state_err;
1539         }
1540
1541         ret = _sdw_enable_stream(stream);
1542
1543 state_err:
1544         sdw_release_bus_lock(stream);
1545         return ret;
1546 }
1547 EXPORT_SYMBOL(sdw_enable_stream);
1548
1549 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1550 {
1551         struct sdw_master_runtime *m_rt;
1552         int ret;
1553
1554         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1555                 struct sdw_bus *bus = m_rt->bus;
1556
1557                 /* Disable port(s) */
1558                 ret = sdw_enable_disable_ports(m_rt, false);
1559                 if (ret < 0) {
1560                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1561                         return ret;
1562                 }
1563         }
1564         stream->state = SDW_STREAM_DISABLED;
1565
1566         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1567                 struct sdw_bus *bus = m_rt->bus;
1568
1569                 /* Program params */
1570                 ret = sdw_program_params(bus, false);
1571                 if (ret < 0) {
1572                         dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1573                         return ret;
1574                 }
1575         }
1576
1577         ret = do_bank_switch(stream);
1578         if (ret < 0) {
1579                 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1580                 return ret;
1581         }
1582
1583         /* make sure alternate bank (previous current) is also disabled */
1584         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1585                 struct sdw_bus *bus = m_rt->bus;
1586
1587                 /* Disable port(s) */
1588                 ret = sdw_enable_disable_ports(m_rt, false);
1589                 if (ret < 0) {
1590                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1591                         return ret;
1592                 }
1593         }
1594
1595         return 0;
1596 }
1597
1598 /**
1599  * sdw_disable_stream() - Disable SoundWire stream
1600  *
1601  * @stream: Soundwire stream
1602  *
1603  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1604  */
1605 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1606 {
1607         int ret;
1608
1609         if (!stream) {
1610                 pr_err("SoundWire: Handle not found for stream\n");
1611                 return -EINVAL;
1612         }
1613
1614         sdw_acquire_bus_lock(stream);
1615
1616         if (stream->state == SDW_STREAM_DISABLED) {
1617                 ret = 0;
1618                 goto state_err;
1619         }
1620
1621         if (stream->state != SDW_STREAM_ENABLED) {
1622                 pr_err("%s: %s: inconsistent state state %d\n",
1623                        __func__, stream->name, stream->state);
1624                 ret = -EINVAL;
1625                 goto state_err;
1626         }
1627
1628         ret = _sdw_disable_stream(stream);
1629
1630 state_err:
1631         sdw_release_bus_lock(stream);
1632         return ret;
1633 }
1634 EXPORT_SYMBOL(sdw_disable_stream);
1635
1636 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1637 {
1638         struct sdw_master_runtime *m_rt;
1639         struct sdw_bus *bus;
1640         int ret = 0;
1641
1642         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1643                 bus = m_rt->bus;
1644                 /* De-prepare port(s) */
1645                 ret = sdw_prep_deprep_ports(m_rt, false);
1646                 if (ret < 0) {
1647                         dev_err(bus->dev,
1648                                 "De-prepare port(s) failed: %d\n", ret);
1649                         return ret;
1650                 }
1651
1652                 /* TODO: Update this during Device-Device support */
1653                 bus->params.bandwidth -= m_rt->stream->params.rate *
1654                         m_rt->ch_count * m_rt->stream->params.bps;
1655
1656                 /* Compute params */
1657                 if (bus->compute_params) {
1658                         ret = bus->compute_params(bus);
1659                         if (ret < 0) {
1660                                 dev_err(bus->dev, "Compute params failed: %d\n",
1661                                         ret);
1662                                 return ret;
1663                         }
1664                 }
1665
1666                 /* Program params */
1667                 ret = sdw_program_params(bus, false);
1668                 if (ret < 0) {
1669                         dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1670                         return ret;
1671                 }
1672         }
1673
1674         stream->state = SDW_STREAM_DEPREPARED;
1675         return do_bank_switch(stream);
1676 }
1677
1678 /**
1679  * sdw_deprepare_stream() - Deprepare SoundWire stream
1680  *
1681  * @stream: Soundwire stream
1682  *
1683  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1684  */
1685 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1686 {
1687         int ret;
1688
1689         if (!stream) {
1690                 pr_err("SoundWire: Handle not found for stream\n");
1691                 return -EINVAL;
1692         }
1693
1694         sdw_acquire_bus_lock(stream);
1695
1696         if (stream->state == SDW_STREAM_DEPREPARED) {
1697                 ret = 0;
1698                 goto state_err;
1699         }
1700
1701         if (stream->state != SDW_STREAM_PREPARED &&
1702             stream->state != SDW_STREAM_DISABLED) {
1703                 pr_err("%s: %s: inconsistent state state %d\n",
1704                        __func__, stream->name, stream->state);
1705                 ret = -EINVAL;
1706                 goto state_err;
1707         }
1708
1709         ret = _sdw_deprepare_stream(stream);
1710
1711 state_err:
1712         sdw_release_bus_lock(stream);
1713         return ret;
1714 }
1715 EXPORT_SYMBOL(sdw_deprepare_stream);
1716
1717 static int set_stream(struct snd_pcm_substream *substream,
1718                       struct sdw_stream_runtime *sdw_stream)
1719 {
1720         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1721         struct snd_soc_dai *dai;
1722         int ret = 0;
1723         int i;
1724
1725         /* Set stream pointer on all DAIs */
1726         for_each_rtd_dais(rtd, i, dai) {
1727                 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1728                 if (ret < 0) {
1729                         dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1730                         break;
1731                 }
1732         }
1733
1734         return ret;
1735 }
1736
1737 /**
1738  * sdw_alloc_stream() - Allocate and return stream runtime
1739  *
1740  * @stream_name: SoundWire stream name
1741  *
1742  * Allocates a SoundWire stream runtime instance.
1743  * sdw_alloc_stream should be called only once per stream. Typically
1744  * invoked from ALSA/ASoC machine/platform driver.
1745  */
1746 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
1747 {
1748         struct sdw_stream_runtime *stream;
1749
1750         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
1751         if (!stream)
1752                 return NULL;
1753
1754         stream->name = stream_name;
1755         INIT_LIST_HEAD(&stream->master_list);
1756         stream->state = SDW_STREAM_ALLOCATED;
1757         stream->m_rt_count = 0;
1758
1759         return stream;
1760 }
1761 EXPORT_SYMBOL(sdw_alloc_stream);
1762
1763 /**
1764  * sdw_startup_stream() - Startup SoundWire stream
1765  *
1766  * @sdw_substream: Soundwire stream
1767  *
1768  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1769  */
1770 int sdw_startup_stream(void *sdw_substream)
1771 {
1772         struct snd_pcm_substream *substream = sdw_substream;
1773         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1774         struct sdw_stream_runtime *sdw_stream;
1775         char *name;
1776         int ret;
1777
1778         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1779                 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1780         else
1781                 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1782
1783         if (!name)
1784                 return -ENOMEM;
1785
1786         sdw_stream = sdw_alloc_stream(name);
1787         if (!sdw_stream) {
1788                 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1789                 ret = -ENOMEM;
1790                 goto error;
1791         }
1792
1793         ret = set_stream(substream, sdw_stream);
1794         if (ret < 0)
1795                 goto release_stream;
1796         return 0;
1797
1798 release_stream:
1799         sdw_release_stream(sdw_stream);
1800         set_stream(substream, NULL);
1801 error:
1802         kfree(name);
1803         return ret;
1804 }
1805 EXPORT_SYMBOL(sdw_startup_stream);
1806
1807 /**
1808  * sdw_shutdown_stream() - Shutdown SoundWire stream
1809  *
1810  * @sdw_substream: Soundwire stream
1811  *
1812  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1813  */
1814 void sdw_shutdown_stream(void *sdw_substream)
1815 {
1816         struct snd_pcm_substream *substream = sdw_substream;
1817         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1818         struct sdw_stream_runtime *sdw_stream;
1819         struct snd_soc_dai *dai;
1820
1821         /* Find stream from first CPU DAI */
1822         dai = asoc_rtd_to_cpu(rtd, 0);
1823
1824         sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1825
1826         if (IS_ERR(sdw_stream)) {
1827                 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1828                 return;
1829         }
1830
1831         /* release memory */
1832         kfree(sdw_stream->name);
1833         sdw_release_stream(sdw_stream);
1834
1835         /* clear DAI data */
1836         set_stream(substream, NULL);
1837 }
1838 EXPORT_SYMBOL(sdw_shutdown_stream);
1839
1840 /**
1841  * sdw_release_stream() - Free the assigned stream runtime
1842  *
1843  * @stream: SoundWire stream runtime
1844  *
1845  * sdw_release_stream should be called only once per stream
1846  */
1847 void sdw_release_stream(struct sdw_stream_runtime *stream)
1848 {
1849         kfree(stream);
1850 }
1851 EXPORT_SYMBOL(sdw_release_stream);
1852
1853 /**
1854  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1855  *
1856  * @bus: SDW Bus instance
1857  * @stream_config: Stream configuration for audio stream
1858  * @port_config: Port configuration for audio stream
1859  * @num_ports: Number of ports
1860  * @stream: SoundWire stream
1861  */
1862 int sdw_stream_add_master(struct sdw_bus *bus,
1863                           struct sdw_stream_config *stream_config,
1864                           struct sdw_port_config *port_config,
1865                           unsigned int num_ports,
1866                           struct sdw_stream_runtime *stream)
1867 {
1868         struct sdw_master_runtime *m_rt;
1869         bool alloc_master_rt = false;
1870         int ret;
1871
1872         mutex_lock(&bus->bus_lock);
1873
1874         /*
1875          * For multi link streams, add the second master only if
1876          * the bus supports it.
1877          * Check if bus->multi_link is set
1878          */
1879         if (!bus->multi_link && stream->m_rt_count > 0) {
1880                 dev_err(bus->dev,
1881                         "Multilink not supported, link %d\n", bus->link_id);
1882                 ret = -EINVAL;
1883                 goto unlock;
1884         }
1885
1886         /*
1887          * check if Master is already allocated (e.g. as a result of Slave adding
1888          * it first), if so skip allocation and go to configuration
1889          */
1890         m_rt = sdw_master_rt_find(bus, stream);
1891         if (!m_rt) {
1892                 m_rt = sdw_master_rt_alloc(bus, stream);
1893                 if (!m_rt) {
1894                         dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
1895                                 __func__, stream->name);
1896                         ret = -ENOMEM;
1897                         goto unlock;
1898                 }
1899
1900                 alloc_master_rt = true;
1901         }
1902
1903         if (!sdw_master_port_allocated(m_rt)) {
1904                 ret = sdw_master_port_alloc(m_rt, num_ports);
1905                 if (ret)
1906                         goto alloc_error;
1907
1908                 stream->m_rt_count++;
1909         }
1910
1911         ret = sdw_master_rt_config(m_rt, stream_config);
1912         if (ret < 0)
1913                 goto unlock;
1914
1915         ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1916         if (ret)
1917                 goto unlock;
1918
1919         ret = sdw_master_port_config(m_rt, port_config);
1920
1921         goto unlock;
1922
1923 alloc_error:
1924         /*
1925          * we only cleanup what was allocated in this routine
1926          */
1927         if (alloc_master_rt)
1928                 sdw_master_rt_free(m_rt, stream);
1929 unlock:
1930         mutex_unlock(&bus->bus_lock);
1931         return ret;
1932 }
1933 EXPORT_SYMBOL(sdw_stream_add_master);
1934
1935 /**
1936  * sdw_stream_remove_master() - Remove master from sdw_stream
1937  *
1938  * @bus: SDW Bus instance
1939  * @stream: SoundWire stream
1940  *
1941  * This removes and frees port_rt and master_rt from a stream
1942  */
1943 int sdw_stream_remove_master(struct sdw_bus *bus,
1944                              struct sdw_stream_runtime *stream)
1945 {
1946         struct sdw_master_runtime *m_rt, *_m_rt;
1947
1948         mutex_lock(&bus->bus_lock);
1949
1950         list_for_each_entry_safe(m_rt, _m_rt,
1951                                  &stream->master_list, stream_node) {
1952                 if (m_rt->bus != bus)
1953                         continue;
1954
1955                 sdw_master_port_free(m_rt);
1956                 sdw_master_rt_free(m_rt, stream);
1957                 stream->m_rt_count--;
1958         }
1959
1960         if (list_empty(&stream->master_list))
1961                 stream->state = SDW_STREAM_RELEASED;
1962
1963         mutex_unlock(&bus->bus_lock);
1964
1965         return 0;
1966 }
1967 EXPORT_SYMBOL(sdw_stream_remove_master);
1968
1969 /**
1970  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1971  *
1972  * @slave: SDW Slave instance
1973  * @stream_config: Stream configuration for audio stream
1974  * @stream: SoundWire stream
1975  * @port_config: Port configuration for audio stream
1976  * @num_ports: Number of ports
1977  *
1978  * It is expected that Slave is added before adding Master
1979  * to the Stream.
1980  *
1981  */
1982 int sdw_stream_add_slave(struct sdw_slave *slave,
1983                          struct sdw_stream_config *stream_config,
1984                          struct sdw_port_config *port_config,
1985                          unsigned int num_ports,
1986                          struct sdw_stream_runtime *stream)
1987 {
1988         struct sdw_slave_runtime *s_rt;
1989         struct sdw_master_runtime *m_rt;
1990         bool alloc_master_rt = false;
1991         bool alloc_slave_rt = false;
1992
1993         int ret;
1994
1995         mutex_lock(&slave->bus->bus_lock);
1996
1997         /*
1998          * check if Master is already allocated, if so skip allocation
1999          * and go to configuration
2000          */
2001         m_rt = sdw_master_rt_find(slave->bus, stream);
2002         if (!m_rt) {
2003                 /*
2004                  * If this API is invoked by Slave first then m_rt is not valid.
2005                  * So, allocate m_rt and add Slave to it.
2006                  */
2007                 m_rt = sdw_master_rt_alloc(slave->bus, stream);
2008                 if (!m_rt) {
2009                         dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
2010                                 __func__, stream->name);
2011                         ret = -ENOMEM;
2012                         goto unlock;
2013                 }
2014
2015                 alloc_master_rt = true;
2016         }
2017
2018         s_rt = sdw_slave_rt_find(slave, stream);
2019         if (!s_rt) {
2020                 s_rt = sdw_slave_rt_alloc(slave, m_rt);
2021                 if (!s_rt) {
2022                         dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n",
2023                                 stream->name);
2024                         ret = -ENOMEM;
2025                         goto alloc_error;
2026                 }
2027
2028                 alloc_slave_rt = true;
2029         }
2030
2031         if (!sdw_slave_port_allocated(s_rt)) {
2032                 ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
2033                 if (ret)
2034                         goto alloc_error;
2035         }
2036
2037         ret =  sdw_master_rt_config(m_rt, stream_config);
2038         if (ret)
2039                 goto unlock;
2040
2041         ret = sdw_slave_rt_config(s_rt, stream_config);
2042         if (ret)
2043                 goto unlock;
2044
2045         ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
2046         if (ret)
2047                 goto unlock;
2048
2049         ret = sdw_slave_port_config(slave, s_rt, port_config);
2050         if (ret)
2051                 goto unlock;
2052
2053         /*
2054          * Change stream state to CONFIGURED on first Slave add.
2055          * Bus is not aware of number of Slave(s) in a stream at this
2056          * point so cannot depend on all Slave(s) to be added in order to
2057          * change stream state to CONFIGURED.
2058          */
2059         stream->state = SDW_STREAM_CONFIGURED;
2060         goto unlock;
2061
2062 alloc_error:
2063         /*
2064          * we only cleanup what was allocated in this routine. The 'else if'
2065          * is intentional, the 'master_rt_free' will call sdw_slave_rt_free()
2066          * internally.
2067          */
2068         if (alloc_master_rt)
2069                 sdw_master_rt_free(m_rt, stream);
2070         else if (alloc_slave_rt)
2071                 sdw_slave_rt_free(slave, stream);
2072 unlock:
2073         mutex_unlock(&slave->bus->bus_lock);
2074         return ret;
2075 }
2076 EXPORT_SYMBOL(sdw_stream_add_slave);
2077
2078 /**
2079  * sdw_stream_remove_slave() - Remove slave from sdw_stream
2080  *
2081  * @slave: SDW Slave instance
2082  * @stream: SoundWire stream
2083  *
2084  * This removes and frees port_rt and slave_rt from a stream
2085  */
2086 int sdw_stream_remove_slave(struct sdw_slave *slave,
2087                             struct sdw_stream_runtime *stream)
2088 {
2089         mutex_lock(&slave->bus->bus_lock);
2090
2091         sdw_slave_port_free(slave, stream);
2092         sdw_slave_rt_free(slave, stream);
2093
2094         mutex_unlock(&slave->bus->bus_lock);
2095
2096         return 0;
2097 }
2098 EXPORT_SYMBOL(sdw_stream_remove_slave);