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