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