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