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  * @multi_link: whether this is a multi-link stream with hardware-based sync
 746  *
 747  * Caller function should free the buffers on error
 748  */
 749 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus, bool multi_link)
 750 {
 751         unsigned long time_left;
 752
 753         if (!multi_link)
 754                 return 0;
 755
 756         /* Wait for completion of transfer */
 757         time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 758                                                 bus->bank_switch_timeout);
 759
 760         if (!time_left) {
 761                 dev_err(bus->dev, "Controller Timed out on bank switch\n");
 762                 return -ETIMEDOUT;
 763         }
 764
 765         bus->params.curr_bank = !bus->params.curr_bank;
 766         bus->params.next_bank = !bus->params.next_bank;
 767
 768         if (bus->defer_msg.msg) {
 769                 kfree(bus->defer_msg.msg->buf);
 770                 kfree(bus->defer_msg.msg);
 771                 bus->defer_msg.msg = NULL;
 772         }
 773
 774         return 0;
 775 }
 776
 777 static int do_bank_switch(struct sdw_stream_runtime *stream)
 778 {
 779         struct sdw_master_runtime *m_rt;
 780         const struct sdw_master_ops *ops;
 781         struct sdw_bus *bus;
 782         bool multi_link = false;
 783         int m_rt_count;
 784         int ret = 0;
 785
 786         m_rt_count = stream->m_rt_count;
 787
 788         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 789                 bus = m_rt->bus;
 790                 ops = bus->ops;
 791
 792                 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
 793                         multi_link = true;
 794                         mutex_lock(&bus->msg_lock);
 795                 }
 796
 797                 /* Pre-bank switch */
 798                 if (ops->pre_bank_switch) {
 799                         ret = ops->pre_bank_switch(bus);
 800                         if (ret < 0) {
 801                                 dev_err(bus->dev,
 802                                         "Pre bank switch op failed: %d\n", ret);
 803                                 goto msg_unlock;
 804                         }
 805                 }
 806
 807                 /*
 808                  * Perform Bank switch operation.
 809                  * For multi link cases, the actual bank switch is
 810                  * synchronized across all Masters and happens later as a
 811                  * part of post_bank_switch ops.
 812                  */
 813                 ret = sdw_bank_switch(bus, m_rt_count);
 814                 if (ret < 0) {
 815                         dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 816                         goto error;
 817                 }
 818         }
 819
 820         /*
 821          * For multi link cases, it is expected that the bank switch is
 822          * triggered by the post_bank_switch for the first Master in the list
 823          * and for the other Masters the post_bank_switch() should return doing
 824          * nothing.
 825          */
 826         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 827                 bus = m_rt->bus;
 828                 ops = bus->ops;
 829
 830                 /* Post-bank switch */
 831                 if (ops->post_bank_switch) {
 832                         ret = ops->post_bank_switch(bus);
 833                         if (ret < 0) {
 834                                 dev_err(bus->dev,
 835                                         "Post bank switch op failed: %d\n",
 836                                         ret);
 837                                 goto error;
 838                         }
 839                 } else if (multi_link) {
 840                         dev_err(bus->dev,
 841                                 "Post bank switch ops not implemented\n");
 842                         ret = -EINVAL;
 843                         goto error;
 844                 }
 845
 846                 /* Set the bank switch timeout to default, if not set */
 847                 if (!bus->bank_switch_timeout)
 848                         bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 849
 850                 /* Check if bank switch was successful */
 851                 ret = sdw_ml_sync_bank_switch(bus, multi_link);
 852                 if (ret < 0) {
 853                         dev_err(bus->dev,
 854                                 "multi link bank switch failed: %d\n", ret);
 855                         goto error;
 856                 }
 857
 858                 if (multi_link)
 859                         mutex_unlock(&bus->msg_lock);
 860         }
 861
 862         return ret;
 863
 864 error:
 865         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 866                 bus = m_rt->bus;
 867                 if (bus->defer_msg.msg) {
 868                         kfree(bus->defer_msg.msg->buf);
 869                         kfree(bus->defer_msg.msg);
 870                         bus->defer_msg.msg = NULL;
 871                 }
 872         }
 873
 874 msg_unlock:
 875
 876         if (multi_link) {
 877                 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 878                         bus = m_rt->bus;
 879                         if (mutex_is_locked(&bus->msg_lock))
 880                                 mutex_unlock(&bus->msg_lock);
 881                 }
 882         }
 883
 884         return ret;
 885 }
 886
 887 static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
 888 {
 889         struct sdw_port_runtime *p_rt;
 890
 891         p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
 892         if (!p_rt)
 893                 return NULL;
 894
 895         list_add_tail(&p_rt->port_node, port_list);
 896
 897         return p_rt;
 898 }
 899
 900 static int sdw_port_config(struct sdw_port_runtime *p_rt,
 901                            const struct sdw_port_config *port_config,
 902                            int port_index)
 903 {
 904         p_rt->ch_mask = port_config[port_index].ch_mask;
 905         p_rt->num = port_config[port_index].num;
 906
 907         /*
 908          * TODO: Check port capabilities for requested configuration
 909          */
 910
 911         return 0;
 912 }
 913
 914 static void sdw_port_free(struct sdw_port_runtime *p_rt)
 915 {
 916         list_del(&p_rt->port_node);
 917         kfree(p_rt);
 918 }
 919
 920 static bool sdw_slave_port_allocated(struct sdw_slave_runtime *s_rt)
 921 {
 922         return !list_empty(&s_rt->port_list);
 923 }
 924
 925 static void sdw_slave_port_free(struct sdw_slave *slave,
 926                                 struct sdw_stream_runtime *stream)
 927 {
 928         struct sdw_port_runtime *p_rt, *_p_rt;
 929         struct sdw_master_runtime *m_rt;
 930         struct sdw_slave_runtime *s_rt;
 931
 932         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 933                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 934                         if (s_rt->slave != slave)
 935                                 continue;
 936
 937                         list_for_each_entry_safe(p_rt, _p_rt,
 938                                                  &s_rt->port_list, port_node) {
 939                                 sdw_port_free(p_rt);
 940                         }
 941                 }
 942         }
 943 }
 944
 945 static int sdw_slave_port_alloc(struct sdw_slave *slave,
 946                                 struct sdw_slave_runtime *s_rt,
 947                                 unsigned int num_config)
 948 {
 949         struct sdw_port_runtime *p_rt;
 950         int i;
 951
 952         /* Iterate for number of ports to perform initialization */
 953         for (i = 0; i < num_config; i++) {
 954                 p_rt = sdw_port_alloc(&s_rt->port_list);
 955                 if (!p_rt)
 956                         return -ENOMEM;
 957         }
 958
 959         return 0;
 960 }
 961
 962 static int sdw_slave_port_is_valid_range(struct device *dev, int num)
 963 {
 964         if (!SDW_VALID_PORT_RANGE(num)) {
 965                 dev_err(dev, "SoundWire: Invalid port number :%d\n", num);
 966                 return -EINVAL;
 967         }
 968
 969         return 0;
 970 }
 971
 972 static int sdw_slave_port_config(struct sdw_slave *slave,
 973                                  struct sdw_slave_runtime *s_rt,
 974                                  const struct sdw_port_config *port_config)
 975 {
 976         struct sdw_port_runtime *p_rt;
 977         int ret;
 978         int i;
 979
 980         i = 0;
 981         list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 982                 /*
 983                  * TODO: Check valid port range as defined by DisCo/
 984                  * slave
 985                  */
 986                 ret = sdw_slave_port_is_valid_range(&slave->dev, port_config[i].num);
 987                 if (ret < 0)
 988                         return ret;
 989
 990                 ret = sdw_port_config(p_rt, port_config, i);
 991                 if (ret < 0)
 992                         return ret;
 993                 i++;
 994         }
 995
 996         return 0;
 997 }
 998
 999 static bool sdw_master_port_allocated(struct sdw_master_runtime *m_rt)
1000 {
1001         return !list_empty(&m_rt->port_list);
1002 }
1003
1004 static void sdw_master_port_free(struct sdw_master_runtime *m_rt)
1005 {
1006         struct sdw_port_runtime *p_rt, *_p_rt;
1007
1008         list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1009                 sdw_port_free(p_rt);
1010         }
1011 }
1012
1013 static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
1014                                  unsigned int num_ports)
1015 {
1016         struct sdw_port_runtime *p_rt;
1017         int i;
1018
1019         /* Iterate for number of ports to perform initialization */
1020         for (i = 0; i < num_ports; i++) {
1021                 p_rt = sdw_port_alloc(&m_rt->port_list);
1022                 if (!p_rt)
1023                         return -ENOMEM;
1024         }
1025
1026         return 0;
1027 }
1028
1029 static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
1030                                   const struct sdw_port_config *port_config)
1031 {
1032         struct sdw_port_runtime *p_rt;
1033         int ret;
1034         int i;
1035
1036         i = 0;
1037         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1038                 ret = sdw_port_config(p_rt, port_config, i);
1039                 if (ret < 0)
1040                         return ret;
1041                 i++;
1042         }
1043
1044         return 0;
1045 }
1046
1047 /**
1048  * sdw_slave_rt_alloc() - Allocate a Slave runtime handle.
1049  *
1050  * @slave: Slave handle
1051  * @m_rt: Master runtime handle
1052  *
1053  * This function is to be called with bus_lock held.
1054  */
1055 static struct sdw_slave_runtime
1056 *sdw_slave_rt_alloc(struct sdw_slave *slave,
1057                     struct sdw_master_runtime *m_rt)
1058 {
1059         struct sdw_slave_runtime *s_rt;
1060
1061         s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1062         if (!s_rt)
1063                 return NULL;
1064
1065         INIT_LIST_HEAD(&s_rt->port_list);
1066         s_rt->slave = slave;
1067
1068         list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1069
1070         return s_rt;
1071 }
1072
1073 /**
1074  * sdw_slave_rt_config() - Configure a Slave runtime handle.
1075  *
1076  * @s_rt: Slave runtime handle
1077  * @stream_config: Stream configuration
1078  *
1079  * This function is to be called with bus_lock held.
1080  */
1081 static int sdw_slave_rt_config(struct sdw_slave_runtime *s_rt,
1082                                struct sdw_stream_config *stream_config)
1083 {
1084         s_rt->ch_count = stream_config->ch_count;
1085         s_rt->direction = stream_config->direction;
1086
1087         return 0;
1088 }
1089
1090 static struct sdw_slave_runtime *sdw_slave_rt_find(struct sdw_slave *slave,
1091                                                    struct sdw_stream_runtime *stream)
1092 {
1093         struct sdw_slave_runtime *s_rt, *_s_rt;
1094         struct sdw_master_runtime *m_rt;
1095
1096         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1097                 /* Retrieve Slave runtime handle */
1098                 list_for_each_entry_safe(s_rt, _s_rt,
1099                                          &m_rt->slave_rt_list, m_rt_node) {
1100                         if (s_rt->slave == slave)
1101                                 return s_rt;
1102                 }
1103         }
1104         return NULL;
1105 }
1106
1107 /**
1108  * sdw_slave_rt_free() - Free Slave(s) runtime handle
1109  *
1110  * @slave: Slave handle.
1111  * @stream: Stream runtime handle.
1112  *
1113  * This function is to be called with bus_lock held.
1114  */
1115 static void sdw_slave_rt_free(struct sdw_slave *slave,
1116                               struct sdw_stream_runtime *stream)
1117 {
1118         struct sdw_slave_runtime *s_rt;
1119
1120         s_rt = sdw_slave_rt_find(slave, stream);
1121         if (s_rt) {
1122                 list_del(&s_rt->m_rt_node);
1123                 kfree(s_rt);
1124         }
1125 }
1126
1127 static struct sdw_master_runtime
1128 *sdw_master_rt_find(struct sdw_bus *bus,
1129                     struct sdw_stream_runtime *stream)
1130 {
1131         struct sdw_master_runtime *m_rt;
1132
1133         /* Retrieve Bus handle if already available */
1134         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1135                 if (m_rt->bus == bus)
1136                         return m_rt;
1137         }
1138
1139         return NULL;
1140 }
1141
1142 /**
1143  * sdw_master_rt_alloc() - Allocates a Master runtime handle
1144  *
1145  * @bus: SDW bus instance
1146  * @stream: Stream runtime handle.
1147  *
1148  * This function is to be called with bus_lock held.
1149  */
1150 static struct sdw_master_runtime
1151 *sdw_master_rt_alloc(struct sdw_bus *bus,
1152                      struct sdw_stream_runtime *stream)
1153 {
1154         struct sdw_master_runtime *m_rt, *walk_m_rt;
1155         struct list_head *insert_after;
1156
1157         m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
1158         if (!m_rt)
1159                 return NULL;
1160
1161         /* Initialization of Master runtime handle */
1162         INIT_LIST_HEAD(&m_rt->port_list);
1163         INIT_LIST_HEAD(&m_rt->slave_rt_list);
1164
1165         /*
1166          * Add in order of bus id so that when taking the bus_lock
1167          * of multiple buses they will always be taken in the same
1168          * order to prevent a mutex deadlock.
1169          */
1170         insert_after = &stream->master_list;
1171         list_for_each_entry_reverse(walk_m_rt, &stream->master_list, stream_node) {
1172                 if (walk_m_rt->bus->id < bus->id) {
1173                         insert_after = &walk_m_rt->stream_node;
1174                         break;
1175                 }
1176         }
1177         list_add(&m_rt->stream_node, insert_after);
1178
1179         list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
1180
1181         m_rt->bus = bus;
1182         m_rt->stream = stream;
1183
1184         return m_rt;
1185 }
1186
1187 /**
1188  * sdw_master_rt_config() - Configure Master runtime handle
1189  *
1190  * @m_rt: Master runtime handle
1191  * @stream_config: Stream configuration
1192  *
1193  * This function is to be called with bus_lock held.
1194  */
1195
1196 static int sdw_master_rt_config(struct sdw_master_runtime *m_rt,
1197                                 struct sdw_stream_config *stream_config)
1198 {
1199         m_rt->ch_count = stream_config->ch_count;
1200         m_rt->direction = stream_config->direction;
1201
1202         return 0;
1203 }
1204
1205 /**
1206  * sdw_master_rt_free() - Free Master runtime handle
1207  *
1208  * @m_rt: Master runtime node
1209  * @stream: Stream runtime handle.
1210  *
1211  * This function is to be called with bus_lock held
1212  * It frees the Master runtime handle and associated Slave(s) runtime
1213  * handle. If this is called first then sdw_slave_rt_free() will have
1214  * no effect as Slave(s) runtime handle would already be freed up.
1215  */
1216 static void sdw_master_rt_free(struct sdw_master_runtime *m_rt,
1217                                struct sdw_stream_runtime *stream)
1218 {
1219         struct sdw_slave_runtime *s_rt, *_s_rt;
1220
1221         list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1222                 sdw_slave_port_free(s_rt->slave, stream);
1223                 sdw_slave_rt_free(s_rt->slave, stream);
1224         }
1225
1226         list_del(&m_rt->stream_node);
1227         list_del(&m_rt->bus_node);
1228         kfree(m_rt);
1229 }
1230
1231 /**
1232  * sdw_config_stream() - Configure the allocated stream
1233  *
1234  * @dev: SDW device
1235  * @stream: SoundWire stream
1236  * @stream_config: Stream configuration for audio stream
1237  * @is_slave: is API called from Slave or Master
1238  *
1239  * This function is to be called with bus_lock held.
1240  */
1241 static int sdw_config_stream(struct device *dev,
1242                              struct sdw_stream_runtime *stream,
1243                              struct sdw_stream_config *stream_config,
1244                              bool is_slave)
1245 {
1246         /*
1247          * Update the stream rate, channel and bps based on data
1248          * source. For more than one data source (multilink),
1249          * match the rate, bps, stream type and increment number of channels.
1250          *
1251          * If rate/bps is zero, it means the values are not set, so skip
1252          * comparison and allow the value to be set and stored in stream
1253          */
1254         if (stream->params.rate &&
1255             stream->params.rate != stream_config->frame_rate) {
1256                 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1257                 return -EINVAL;
1258         }
1259
1260         if (stream->params.bps &&
1261             stream->params.bps != stream_config->bps) {
1262                 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1263                 return -EINVAL;
1264         }
1265
1266         stream->type = stream_config->type;
1267         stream->params.rate = stream_config->frame_rate;
1268         stream->params.bps = stream_config->bps;
1269
1270         /* TODO: Update this check during Device-device support */
1271         if (is_slave)
1272                 stream->params.ch_count += stream_config->ch_count;
1273
1274         return 0;
1275 }
1276
1277 /**
1278  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1279  *
1280  * @slave: Slave handle
1281  * @direction: Data direction.
1282  * @port_num: Port number
1283  */
1284 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1285                                             enum sdw_data_direction direction,
1286                                             unsigned int port_num)
1287 {
1288         struct sdw_dpn_prop *dpn_prop;
1289         u8 num_ports;
1290         int i;
1291
1292         if (direction == SDW_DATA_DIR_TX) {
1293                 num_ports = hweight32(slave->prop.source_ports);
1294                 dpn_prop = slave->prop.src_dpn_prop;
1295         } else {
1296                 num_ports = hweight32(slave->prop.sink_ports);
1297                 dpn_prop = slave->prop.sink_dpn_prop;
1298         }
1299
1300         for (i = 0; i < num_ports; i++) {
1301                 if (dpn_prop[i].num == port_num)
1302                         return &dpn_prop[i];
1303         }
1304
1305         return NULL;
1306 }
1307
1308 /**
1309  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1310  *
1311  * @stream: SoundWire stream
1312  *
1313  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1314  * stream to reconfigure the bus.
1315  * NOTE: This function is called from SoundWire stream ops and is
1316  * expected that a global lock is held before acquiring bus_lock.
1317  */
1318 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1319 {
1320         struct sdw_master_runtime *m_rt;
1321         struct sdw_bus *bus;
1322
1323         /* Iterate for all Master(s) in Master list */
1324         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1325                 bus = m_rt->bus;
1326
1327                 mutex_lock(&bus->bus_lock);
1328         }
1329 }
1330
1331 /**
1332  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1333  *
1334  * @stream: SoundWire stream
1335  *
1336  * Release the previously held bus_lock after reconfiguring the bus.
1337  * NOTE: This function is called from SoundWire stream ops and is
1338  * expected that a global lock is held before releasing bus_lock.
1339  */
1340 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1341 {
1342         struct sdw_master_runtime *m_rt;
1343         struct sdw_bus *bus;
1344
1345         /* Iterate for all Master(s) in Master list */
1346         list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1347                 bus = m_rt->bus;
1348                 mutex_unlock(&bus->bus_lock);
1349         }
1350 }
1351
1352 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1353                                bool update_params)
1354 {
1355         struct sdw_master_runtime *m_rt;
1356         struct sdw_bus *bus;
1357         struct sdw_master_prop *prop;
1358         struct sdw_bus_params params;
1359         int ret;
1360
1361         /* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1362         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1363                 bus = m_rt->bus;
1364                 prop = &bus->prop;
1365                 memcpy(&params, &bus->params, sizeof(params));
1366
1367                 /* TODO: Support Asynchronous mode */
1368                 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1369                         dev_err(bus->dev, "Async mode not supported\n");
1370                         return -EINVAL;
1371                 }
1372
1373                 if (update_params) {
1374                         /* Increment cumulative bus bandwidth */
1375                         /* TODO: Update this during Device-Device support */
1376                         bus->params.bandwidth += m_rt->stream->params.rate *
1377                                 m_rt->ch_count * m_rt->stream->params.bps;
1378
1379                         /* Compute params */
1380                         if (bus->compute_params) {
1381                                 ret = bus->compute_params(bus);
1382                                 if (ret < 0) {
1383                                         dev_err(bus->dev, "Compute params failed: %d\n",
1384                                                 ret);
1385                                         goto restore_params;
1386                                 }
1387                         }
1388                 }
1389
1390                 /* Program params */
1391                 ret = sdw_program_params(bus, true);
1392                 if (ret < 0) {
1393                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1394                         goto restore_params;
1395                 }
1396         }
1397
1398         ret = do_bank_switch(stream);
1399         if (ret < 0) {
1400                 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1401                 goto restore_params;
1402         }
1403
1404         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1405                 bus = m_rt->bus;
1406
1407                 /* Prepare port(s) on the new clock configuration */
1408                 ret = sdw_prep_deprep_ports(m_rt, true);
1409                 if (ret < 0) {
1410                         dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1411                                 ret);
1412                         return ret;
1413                 }
1414         }
1415
1416         stream->state = SDW_STREAM_PREPARED;
1417
1418         return ret;
1419
1420 restore_params:
1421         memcpy(&bus->params, &params, sizeof(params));
1422         return ret;
1423 }
1424
1425 /**
1426  * sdw_prepare_stream() - Prepare SoundWire stream
1427  *
1428  * @stream: Soundwire stream
1429  *
1430  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1431  */
1432 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1433 {
1434         bool update_params = true;
1435         int ret;
1436
1437         if (!stream) {
1438                 pr_err("SoundWire: Handle not found for stream\n");
1439                 return -EINVAL;
1440         }
1441
1442         sdw_acquire_bus_lock(stream);
1443
1444         if (stream->state == SDW_STREAM_PREPARED) {
1445                 ret = 0;
1446                 goto state_err;
1447         }
1448
1449         if (stream->state != SDW_STREAM_CONFIGURED &&
1450             stream->state != SDW_STREAM_DEPREPARED &&
1451             stream->state != SDW_STREAM_DISABLED) {
1452                 pr_err("%s: %s: inconsistent state state %d\n",
1453                        __func__, stream->name, stream->state);
1454                 ret = -EINVAL;
1455                 goto state_err;
1456         }
1457
1458         /*
1459          * when the stream is DISABLED, this means sdw_prepare_stream()
1460          * is called as a result of an underflow or a resume operation.
1461          * In this case, the bus parameters shall not be recomputed, but
1462          * still need to be re-applied
1463          */
1464         if (stream->state == SDW_STREAM_DISABLED)
1465                 update_params = false;
1466
1467         ret = _sdw_prepare_stream(stream, update_params);
1468
1469 state_err:
1470         sdw_release_bus_lock(stream);
1471         return ret;
1472 }
1473 EXPORT_SYMBOL(sdw_prepare_stream);
1474
1475 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1476 {
1477         struct sdw_master_runtime *m_rt;
1478         struct sdw_bus *bus;
1479         int ret;
1480
1481         /* Enable Master(s) and Slave(s) port(s) associated with stream */
1482         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1483                 bus = m_rt->bus;
1484
1485                 /* Program params */
1486                 ret = sdw_program_params(bus, false);
1487                 if (ret < 0) {
1488                         dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1489                         return ret;
1490                 }
1491
1492                 /* Enable port(s) */
1493                 ret = sdw_enable_disable_ports(m_rt, true);
1494                 if (ret < 0) {
1495                         dev_err(bus->dev,
1496                                 "Enable port(s) failed ret: %d\n", ret);
1497                         return ret;
1498                 }
1499         }
1500
1501         ret = do_bank_switch(stream);
1502         if (ret < 0) {
1503                 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1504                 return ret;
1505         }
1506
1507         stream->state = SDW_STREAM_ENABLED;
1508         return 0;
1509 }
1510
1511 /**
1512  * sdw_enable_stream() - Enable SoundWire stream
1513  *
1514  * @stream: Soundwire stream
1515  *
1516  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1517  */
1518 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1519 {
1520         int ret;
1521
1522         if (!stream) {
1523                 pr_err("SoundWire: Handle not found for stream\n");
1524                 return -EINVAL;
1525         }
1526
1527         sdw_acquire_bus_lock(stream);
1528
1529         if (stream->state == SDW_STREAM_ENABLED) {
1530                 ret = 0;
1531                 goto state_err;
1532         }
1533
1534         if (stream->state != SDW_STREAM_PREPARED &&
1535             stream->state != SDW_STREAM_DISABLED) {
1536                 pr_err("%s: %s: inconsistent state state %d\n",
1537                        __func__, stream->name, stream->state);
1538                 ret = -EINVAL;
1539                 goto state_err;
1540         }
1541
1542         ret = _sdw_enable_stream(stream);
1543
1544 state_err:
1545         sdw_release_bus_lock(stream);
1546         return ret;
1547 }
1548 EXPORT_SYMBOL(sdw_enable_stream);
1549
1550 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1551 {
1552         struct sdw_master_runtime *m_rt;
1553         int ret;
1554
1555         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1556                 struct sdw_bus *bus = m_rt->bus;
1557
1558                 /* Disable port(s) */
1559                 ret = sdw_enable_disable_ports(m_rt, false);
1560                 if (ret < 0) {
1561                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1562                         return ret;
1563                 }
1564         }
1565         stream->state = SDW_STREAM_DISABLED;
1566
1567         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1568                 struct sdw_bus *bus = m_rt->bus;
1569
1570                 /* Program params */
1571                 ret = sdw_program_params(bus, false);
1572                 if (ret < 0) {
1573                         dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1574                         return ret;
1575                 }
1576         }
1577
1578         ret = do_bank_switch(stream);
1579         if (ret < 0) {
1580                 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1581                 return ret;
1582         }
1583
1584         /* make sure alternate bank (previous current) is also disabled */
1585         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1586                 struct sdw_bus *bus = m_rt->bus;
1587
1588                 /* Disable port(s) */
1589                 ret = sdw_enable_disable_ports(m_rt, false);
1590                 if (ret < 0) {
1591                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1592                         return ret;
1593                 }
1594         }
1595
1596         return 0;
1597 }
1598
1599 /**
1600  * sdw_disable_stream() - Disable SoundWire stream
1601  *
1602  * @stream: Soundwire stream
1603  *
1604  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1605  */
1606 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1607 {
1608         int ret;
1609
1610         if (!stream) {
1611                 pr_err("SoundWire: Handle not found for stream\n");
1612                 return -EINVAL;
1613         }
1614
1615         sdw_acquire_bus_lock(stream);
1616
1617         if (stream->state == SDW_STREAM_DISABLED) {
1618                 ret = 0;
1619                 goto state_err;
1620         }
1621
1622         if (stream->state != SDW_STREAM_ENABLED) {
1623                 pr_err("%s: %s: inconsistent state state %d\n",
1624                        __func__, stream->name, stream->state);
1625                 ret = -EINVAL;
1626                 goto state_err;
1627         }
1628
1629         ret = _sdw_disable_stream(stream);
1630
1631 state_err:
1632         sdw_release_bus_lock(stream);
1633         return ret;
1634 }
1635 EXPORT_SYMBOL(sdw_disable_stream);
1636
1637 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1638 {
1639         struct sdw_master_runtime *m_rt;
1640         struct sdw_bus *bus;
1641         int ret = 0;
1642
1643         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1644                 bus = m_rt->bus;
1645                 /* De-prepare port(s) */
1646                 ret = sdw_prep_deprep_ports(m_rt, false);
1647                 if (ret < 0) {
1648                         dev_err(bus->dev,
1649                                 "De-prepare port(s) failed: %d\n", ret);
1650                         return ret;
1651                 }
1652
1653                 /* TODO: Update this during Device-Device support */
1654                 bus->params.bandwidth -= m_rt->stream->params.rate *
1655                         m_rt->ch_count * m_rt->stream->params.bps;
1656
1657                 /* Compute params */
1658                 if (bus->compute_params) {
1659                         ret = bus->compute_params(bus);
1660                         if (ret < 0) {
1661                                 dev_err(bus->dev, "Compute params failed: %d\n",
1662                                         ret);
1663                                 return ret;
1664                         }
1665                 }
1666
1667                 /* Program params */
1668                 ret = sdw_program_params(bus, false);
1669                 if (ret < 0) {
1670                         dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1671                         return ret;
1672                 }
1673         }
1674
1675         stream->state = SDW_STREAM_DEPREPARED;
1676         return do_bank_switch(stream);
1677 }
1678
1679 /**
1680  * sdw_deprepare_stream() - Deprepare SoundWire stream
1681  *
1682  * @stream: Soundwire stream
1683  *
1684  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1685  */
1686 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1687 {
1688         int ret;
1689
1690         if (!stream) {
1691                 pr_err("SoundWire: Handle not found for stream\n");
1692                 return -EINVAL;
1693         }
1694
1695         sdw_acquire_bus_lock(stream);
1696
1697         if (stream->state == SDW_STREAM_DEPREPARED) {
1698                 ret = 0;
1699                 goto state_err;
1700         }
1701
1702         if (stream->state != SDW_STREAM_PREPARED &&
1703             stream->state != SDW_STREAM_DISABLED) {
1704                 pr_err("%s: %s: inconsistent state state %d\n",
1705                        __func__, stream->name, stream->state);
1706                 ret = -EINVAL;
1707                 goto state_err;
1708         }
1709
1710         ret = _sdw_deprepare_stream(stream);
1711
1712 state_err:
1713         sdw_release_bus_lock(stream);
1714         return ret;
1715 }
1716 EXPORT_SYMBOL(sdw_deprepare_stream);
1717
1718 static int set_stream(struct snd_pcm_substream *substream,
1719                       struct sdw_stream_runtime *sdw_stream)
1720 {
1721         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1722         struct snd_soc_dai *dai;
1723         int ret = 0;
1724         int i;
1725
1726         /* Set stream pointer on all DAIs */
1727         for_each_rtd_dais(rtd, i, dai) {
1728                 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1729                 if (ret < 0) {
1730                         dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1731                         break;
1732                 }
1733         }
1734
1735         return ret;
1736 }
1737
1738 /**
1739  * sdw_alloc_stream() - Allocate and return stream runtime
1740  *
1741  * @stream_name: SoundWire stream name
1742  *
1743  * Allocates a SoundWire stream runtime instance.
1744  * sdw_alloc_stream should be called only once per stream. Typically
1745  * invoked from ALSA/ASoC machine/platform driver.
1746  */
1747 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
1748 {
1749         struct sdw_stream_runtime *stream;
1750
1751         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
1752         if (!stream)
1753                 return NULL;
1754
1755         stream->name = stream_name;
1756         INIT_LIST_HEAD(&stream->master_list);
1757         stream->state = SDW_STREAM_ALLOCATED;
1758         stream->m_rt_count = 0;
1759
1760         return stream;
1761 }
1762 EXPORT_SYMBOL(sdw_alloc_stream);
1763
1764 /**
1765  * sdw_startup_stream() - Startup SoundWire stream
1766  *
1767  * @sdw_substream: Soundwire stream
1768  *
1769  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1770  */
1771 int sdw_startup_stream(void *sdw_substream)
1772 {
1773         struct snd_pcm_substream *substream = sdw_substream;
1774         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1775         struct sdw_stream_runtime *sdw_stream;
1776         char *name;
1777         int ret;
1778
1779         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1780                 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1781         else
1782                 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1783
1784         if (!name)
1785                 return -ENOMEM;
1786
1787         sdw_stream = sdw_alloc_stream(name);
1788         if (!sdw_stream) {
1789                 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1790                 ret = -ENOMEM;
1791                 goto error;
1792         }
1793
1794         ret = set_stream(substream, sdw_stream);
1795         if (ret < 0)
1796                 goto release_stream;
1797         return 0;
1798
1799 release_stream:
1800         sdw_release_stream(sdw_stream);
1801         set_stream(substream, NULL);
1802 error:
1803         kfree(name);
1804         return ret;
1805 }
1806 EXPORT_SYMBOL(sdw_startup_stream);
1807
1808 /**
1809  * sdw_shutdown_stream() - Shutdown SoundWire stream
1810  *
1811  * @sdw_substream: Soundwire stream
1812  *
1813  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1814  */
1815 void sdw_shutdown_stream(void *sdw_substream)
1816 {
1817         struct snd_pcm_substream *substream = sdw_substream;
1818         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1819         struct sdw_stream_runtime *sdw_stream;
1820         struct snd_soc_dai *dai;
1821
1822         /* Find stream from first CPU DAI */
1823         dai = snd_soc_rtd_to_cpu(rtd, 0);
1824
1825         sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1826
1827         if (IS_ERR(sdw_stream)) {
1828                 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1829                 return;
1830         }
1831
1832         /* release memory */
1833         kfree(sdw_stream->name);
1834         sdw_release_stream(sdw_stream);
1835
1836         /* clear DAI data */
1837         set_stream(substream, NULL);
1838 }
1839 EXPORT_SYMBOL(sdw_shutdown_stream);
1840
1841 /**
1842  * sdw_release_stream() - Free the assigned stream runtime
1843  *
1844  * @stream: SoundWire stream runtime
1845  *
1846  * sdw_release_stream should be called only once per stream
1847  */
1848 void sdw_release_stream(struct sdw_stream_runtime *stream)
1849 {
1850         kfree(stream);
1851 }
1852 EXPORT_SYMBOL(sdw_release_stream);
1853
1854 /**
1855  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1856  *
1857  * @bus: SDW Bus instance
1858  * @stream_config: Stream configuration for audio stream
1859  * @port_config: Port configuration for audio stream
1860  * @num_ports: Number of ports
1861  * @stream: SoundWire stream
1862  */
1863 int sdw_stream_add_master(struct sdw_bus *bus,
1864                           struct sdw_stream_config *stream_config,
1865                           const struct sdw_port_config *port_config,
1866                           unsigned int num_ports,
1867                           struct sdw_stream_runtime *stream)
1868 {
1869         struct sdw_master_runtime *m_rt;
1870         bool alloc_master_rt = false;
1871         int ret;
1872
1873         mutex_lock(&bus->bus_lock);
1874
1875         /*
1876          * For multi link streams, add the second master only if
1877          * the bus supports it.
1878          * Check if bus->multi_link is set
1879          */
1880         if (!bus->multi_link && stream->m_rt_count > 0) {
1881                 dev_err(bus->dev,
1882                         "Multilink not supported, link %d\n", bus->link_id);
1883                 ret = -EINVAL;
1884                 goto unlock;
1885         }
1886
1887         /*
1888          * check if Master is already allocated (e.g. as a result of Slave adding
1889          * it first), if so skip allocation and go to configuration
1890          */
1891         m_rt = sdw_master_rt_find(bus, stream);
1892         if (!m_rt) {
1893                 m_rt = sdw_master_rt_alloc(bus, stream);
1894                 if (!m_rt) {
1895                         dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
1896                                 __func__, stream->name);
1897                         ret = -ENOMEM;
1898                         goto unlock;
1899                 }
1900
1901                 alloc_master_rt = true;
1902         }
1903
1904         if (!sdw_master_port_allocated(m_rt)) {
1905                 ret = sdw_master_port_alloc(m_rt, num_ports);
1906                 if (ret)
1907                         goto alloc_error;
1908
1909                 stream->m_rt_count++;
1910         }
1911
1912         ret = sdw_master_rt_config(m_rt, stream_config);
1913         if (ret < 0)
1914                 goto unlock;
1915
1916         ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1917         if (ret)
1918                 goto unlock;
1919
1920         ret = sdw_master_port_config(m_rt, port_config);
1921
1922         goto unlock;
1923
1924 alloc_error:
1925         /*
1926          * we only cleanup what was allocated in this routine
1927          */
1928         if (alloc_master_rt)
1929                 sdw_master_rt_free(m_rt, stream);
1930 unlock:
1931         mutex_unlock(&bus->bus_lock);
1932         return ret;
1933 }
1934 EXPORT_SYMBOL(sdw_stream_add_master);
1935
1936 /**
1937  * sdw_stream_remove_master() - Remove master from sdw_stream
1938  *
1939  * @bus: SDW Bus instance
1940  * @stream: SoundWire stream
1941  *
1942  * This removes and frees port_rt and master_rt from a stream
1943  */
1944 int sdw_stream_remove_master(struct sdw_bus *bus,
1945                              struct sdw_stream_runtime *stream)
1946 {
1947         struct sdw_master_runtime *m_rt, *_m_rt;
1948
1949         mutex_lock(&bus->bus_lock);
1950
1951         list_for_each_entry_safe(m_rt, _m_rt,
1952                                  &stream->master_list, stream_node) {
1953                 if (m_rt->bus != bus)
1954                         continue;
1955
1956                 sdw_master_port_free(m_rt);
1957                 sdw_master_rt_free(m_rt, stream);
1958                 stream->m_rt_count--;
1959         }
1960
1961         if (list_empty(&stream->master_list))
1962                 stream->state = SDW_STREAM_RELEASED;
1963
1964         mutex_unlock(&bus->bus_lock);
1965
1966         return 0;
1967 }
1968 EXPORT_SYMBOL(sdw_stream_remove_master);
1969
1970 /**
1971  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1972  *
1973  * @slave: SDW Slave instance
1974  * @stream_config: Stream configuration for audio stream
1975  * @stream: SoundWire stream
1976  * @port_config: Port configuration for audio stream
1977  * @num_ports: Number of ports
1978  *
1979  * It is expected that Slave is added before adding Master
1980  * to the Stream.
1981  *
1982  */
1983 int sdw_stream_add_slave(struct sdw_slave *slave,
1984                          struct sdw_stream_config *stream_config,
1985                          const struct sdw_port_config *port_config,
1986                          unsigned int num_ports,
1987                          struct sdw_stream_runtime *stream)
1988 {
1989         struct sdw_slave_runtime *s_rt;
1990         struct sdw_master_runtime *m_rt;
1991         bool alloc_master_rt = false;
1992         bool alloc_slave_rt = false;
1993
1994         int ret;
1995
1996         mutex_lock(&slave->bus->bus_lock);
1997
1998         /*
1999          * check if Master is already allocated, if so skip allocation
2000          * and go to configuration
2001          */
2002         m_rt = sdw_master_rt_find(slave->bus, stream);
2003         if (!m_rt) {
2004                 /*
2005                  * If this API is invoked by Slave first then m_rt is not valid.
2006                  * So, allocate m_rt and add Slave to it.
2007                  */
2008                 m_rt = sdw_master_rt_alloc(slave->bus, stream);
2009                 if (!m_rt) {
2010                         dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
2011                                 __func__, stream->name);
2012                         ret = -ENOMEM;
2013                         goto unlock;
2014                 }
2015
2016                 alloc_master_rt = true;
2017         }
2018
2019         s_rt = sdw_slave_rt_find(slave, stream);
2020         if (!s_rt) {
2021                 s_rt = sdw_slave_rt_alloc(slave, m_rt);
2022                 if (!s_rt) {
2023                         dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n",
2024                                 stream->name);
2025                         ret = -ENOMEM;
2026                         goto alloc_error;
2027                 }
2028
2029                 alloc_slave_rt = true;
2030         }
2031
2032         if (!sdw_slave_port_allocated(s_rt)) {
2033                 ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
2034                 if (ret)
2035                         goto alloc_error;
2036         }
2037
2038         ret =  sdw_master_rt_config(m_rt, stream_config);
2039         if (ret)
2040                 goto unlock;
2041
2042         ret = sdw_slave_rt_config(s_rt, stream_config);
2043         if (ret)
2044                 goto unlock;
2045
2046         ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
2047         if (ret)
2048                 goto unlock;
2049
2050         ret = sdw_slave_port_config(slave, s_rt, port_config);
2051         if (ret)
2052                 goto unlock;
2053
2054         /*
2055          * Change stream state to CONFIGURED on first Slave add.
2056          * Bus is not aware of number of Slave(s) in a stream at this
2057          * point so cannot depend on all Slave(s) to be added in order to
2058          * change stream state to CONFIGURED.
2059          */
2060         stream->state = SDW_STREAM_CONFIGURED;
2061         goto unlock;
2062
2063 alloc_error:
2064         /*
2065          * we only cleanup what was allocated in this routine. The 'else if'
2066          * is intentional, the 'master_rt_free' will call sdw_slave_rt_free()
2067          * internally.
2068          */
2069         if (alloc_master_rt)
2070                 sdw_master_rt_free(m_rt, stream);
2071         else if (alloc_slave_rt)
2072                 sdw_slave_rt_free(slave, stream);
2073 unlock:
2074         mutex_unlock(&slave->bus->bus_lock);
2075         return ret;
2076 }
2077 EXPORT_SYMBOL(sdw_stream_add_slave);
2078
2079 /**
2080  * sdw_stream_remove_slave() - Remove slave from sdw_stream
2081  *
2082  * @slave: SDW Slave instance
2083  * @stream: SoundWire stream
2084  *
2085  * This removes and frees port_rt and slave_rt from a stream
2086  */
2087 int sdw_stream_remove_slave(struct sdw_slave *slave,
2088                             struct sdw_stream_runtime *stream)
2089 {
2090         mutex_lock(&slave->bus->bus_lock);
2091
2092         sdw_slave_port_free(slave, stream);
2093         sdw_slave_rt_free(slave, stream);
2094
2095         mutex_unlock(&slave->bus->bus_lock);
2096
2097         return 0;
2098 }
2099 EXPORT_SYMBOL(sdw_stream_remove_slave);