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