1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2// Copyright(c) 2015-18 Intel Corporation.
   3
   4/*
   5 *  stream.c - SoundWire Bus stream operations.
   6 */
   7
   8#include <linux/delay.h>
   9#include <linux/device.h>
  10#include <linux/init.h>
  11#include <linux/module.h>
  12#include <linux/mod_devicetable.h>
  13#include <linux/slab.h>
  14#include <linux/soundwire/sdw_registers.h>
  15#include <linux/soundwire/sdw.h>
  16#include <linux/soundwire/sdw_type.h>
  17#include <sound/soc.h>
  18#include "bus.h"
  19
  20/*
  21 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
  22 *
  23 * The rows are arranged as per the array index value programmed
  24 * in register. The index 15 has dummy value 0 in order to fill hole.
  25 */
  26int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
  27			96, 100, 120, 128, 150, 160, 250, 0,
  28			192, 200, 240, 256, 72, 144, 90, 180};
  29EXPORT_SYMBOL(sdw_rows);
  30
  31int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
  32EXPORT_SYMBOL(sdw_cols);
  33
  34int sdw_find_col_index(int col)
  35{
  36	int i;
  37
  38	for (i = 0; i < SDW_FRAME_COLS; i++) {
  39		if (sdw_cols[i] == col)
  40			return i;
  41	}
  42
  43	pr_warn("Requested column not found, selecting lowest column no: 2\n");
  44	return 0;
  45}
  46EXPORT_SYMBOL(sdw_find_col_index);
  47
  48int sdw_find_row_index(int row)
  49{
  50	int i;
  51
  52	for (i = 0; i < SDW_FRAME_ROWS; i++) {
  53		if (sdw_rows[i] == row)
  54			return i;
  55	}
  56
  57	pr_warn("Requested row not found, selecting lowest row no: 48\n");
  58	return 0;
  59}
  60EXPORT_SYMBOL(sdw_find_row_index);
  61
  62static int _sdw_program_slave_port_params(struct sdw_bus *bus,
  63					  struct sdw_slave *slave,
  64					  struct sdw_transport_params *t_params,
  65					  enum sdw_dpn_type type)
  66{
  67	u32 addr1, addr2, addr3, addr4;
  68	int ret;
  69	u16 wbuf;
  70
  71	if (bus->params.next_bank) {
  72		addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
  73		addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
  74		addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
  75		addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
  76	} else {
  77		addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
  78		addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
  79		addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
  80		addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
  81	}
  82
  83	/* Program DPN_OffsetCtrl2 registers */
  84	ret = sdw_write(slave, addr1, t_params->offset2);
  85	if (ret < 0) {
  86		dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
  87		return ret;
  88	}
  89
  90	/* Program DPN_BlockCtrl3 register */
  91	ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
  92	if (ret < 0) {
  93		dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
  94		return ret;
  95	}
  96
  97	/*
  98	 * Data ports are FULL, SIMPLE and REDUCED. This function handles
  99	 * FULL and REDUCED only and beyond this point only FULL is
 100	 * handled, so bail out if we are not FULL data port type
 101	 */
 102	if (type != SDW_DPN_FULL)
 103		return ret;
 104
 105	/* Program DPN_SampleCtrl2 register */
 106	wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
 107
 108	ret = sdw_write(slave, addr3, wbuf);
 109	if (ret < 0) {
 110		dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
 111		return ret;
 112	}
 113
 114	/* Program DPN_HCtrl register */
 115	wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
 116	wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
 117
 118	ret = sdw_write(slave, addr4, wbuf);
 119	if (ret < 0)
 120		dev_err(bus->dev, "DPN_HCtrl register write failed\n");
 121
 122	return ret;
 123}
 124
 125static int sdw_program_slave_port_params(struct sdw_bus *bus,
 126					 struct sdw_slave_runtime *s_rt,
 127					 struct sdw_port_runtime *p_rt)
 128{
 129	struct sdw_transport_params *t_params = &p_rt->transport_params;
 130	struct sdw_port_params *p_params = &p_rt->port_params;
 131	struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
 132	u32 addr1, addr2, addr3, addr4, addr5, addr6;
 133	struct sdw_dpn_prop *dpn_prop;
 134	int ret;
 135	u8 wbuf;
 136
 137	if (s_rt->slave->is_mockup_device)
 138		return 0;
 139
 140	dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 141					  s_rt->direction,
 142					  t_params->port_num);
 143	if (!dpn_prop)
 144		return -EINVAL;
 145
 146	addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
 147	addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
 148
 149	if (bus->params.next_bank) {
 150		addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
 151		addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
 152		addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
 153		addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
 154
 155	} else {
 156		addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
 157		addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
 158		addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
 159		addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
 160	}
 161
 162	/* Program DPN_PortCtrl register */
 163	wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
 164	wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
 165
 166	ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
 167	if (ret < 0) {
 168		dev_err(&s_rt->slave->dev,
 169			"DPN_PortCtrl register write failed for port %d\n",
 170			t_params->port_num);
 171		return ret;
 172	}
 173
 174	if (!dpn_prop->read_only_wordlength) {
 175		/* Program DPN_BlockCtrl1 register */
 176		ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
 177		if (ret < 0) {
 178			dev_err(&s_rt->slave->dev,
 179				"DPN_BlockCtrl1 register write failed for port %d\n",
 180				t_params->port_num);
 181			return ret;
 182		}
 183	}
 184
 185	/* Program DPN_SampleCtrl1 register */
 186	wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
 187	ret = sdw_write(s_rt->slave, addr3, wbuf);
 188	if (ret < 0) {
 189		dev_err(&s_rt->slave->dev,
 190			"DPN_SampleCtrl1 register write failed for port %d\n",
 191			t_params->port_num);
 192		return ret;
 193	}
 194
 195	/* Program DPN_OffsetCtrl1 registers */
 196	ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
 197	if (ret < 0) {
 198		dev_err(&s_rt->slave->dev,
 199			"DPN_OffsetCtrl1 register write failed for port %d\n",
 200			t_params->port_num);
 201		return ret;
 202	}
 203
 204	/* Program DPN_BlockCtrl2 register*/
 205	if (t_params->blk_grp_ctrl_valid) {
 206		ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
 207		if (ret < 0) {
 208			dev_err(&s_rt->slave->dev,
 209				"DPN_BlockCtrl2 reg write failed for port %d\n",
 210				t_params->port_num);
 211			return ret;
 212		}
 213	}
 214
 215	/* program DPN_LaneCtrl register */
 216	if (slave_prop->lane_control_support) {
 217		ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
 218		if (ret < 0) {
 219			dev_err(&s_rt->slave->dev,
 220				"DPN_LaneCtrl register write failed for port %d\n",
 221				t_params->port_num);
 222			return ret;
 223		}
 224	}
 225
 226	if (dpn_prop->type != SDW_DPN_SIMPLE) {
 227		ret = _sdw_program_slave_port_params(bus, s_rt->slave,
 228						     t_params, dpn_prop->type);
 229		if (ret < 0)
 230			dev_err(&s_rt->slave->dev,
 231				"Transport reg write failed for port: %d\n",
 232				t_params->port_num);
 233	}
 234
 235	return ret;
 236}
 237
 238static int sdw_program_master_port_params(struct sdw_bus *bus,
 239					  struct sdw_port_runtime *p_rt)
 240{
 241	int ret;
 242
 243	/*
 244	 * we need to set transport and port parameters for the port.
 245	 * Transport parameters refers to the sample interval, offsets and
 246	 * hstart/stop etc of the data. Port parameters refers to word
 247	 * length, flow mode etc of the port
 248	 */
 249	ret = bus->port_ops->dpn_set_port_transport_params(bus,
 250					&p_rt->transport_params,
 251					bus->params.next_bank);
 252	if (ret < 0)
 253		return ret;
 254
 255	return bus->port_ops->dpn_set_port_params(bus,
 256						  &p_rt->port_params,
 257						  bus->params.next_bank);
 258}
 259
 260/**
 261 * sdw_program_port_params() - Programs transport parameters of Master(s)
 262 * and Slave(s)
 263 *
 264 * @m_rt: Master stream runtime
 265 */
 266static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
 267{
 268	struct sdw_slave_runtime *s_rt;
 269	struct sdw_bus *bus = m_rt->bus;
 270	struct sdw_port_runtime *p_rt;
 271	int ret = 0;
 272
 273	/* Program transport & port parameters for Slave(s) */
 274	list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 275		list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 276			ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
 277			if (ret < 0)
 278				return ret;
 279		}
 280	}
 281
 282	/* Program transport & port parameters for Master(s) */
 283	list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 284		ret = sdw_program_master_port_params(bus, p_rt);
 285		if (ret < 0)
 286			return ret;
 287	}
 288
 289	return 0;
 290}
 291
 292/**
 293 * sdw_enable_disable_slave_ports: Enable/disable slave data port
 294 *
 295 * @bus: bus instance
 296 * @s_rt: slave runtime
 297 * @p_rt: port runtime
 298 * @en: enable or disable operation
 299 *
 300 * This function only sets the enable/disable bits in the relevant bank, the
 301 * actual enable/disable is done with a bank switch
 302 */
 303static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
 304					  struct sdw_slave_runtime *s_rt,
 305					  struct sdw_port_runtime *p_rt,
 306					  bool en)
 307{
 308	struct sdw_transport_params *t_params = &p_rt->transport_params;
 309	u32 addr;
 310	int ret;
 311
 312	if (bus->params.next_bank)
 313		addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
 314	else
 315		addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
 316
 317	/*
 318	 * Since bus doesn't support sharing a port across two streams,
 319	 * it is safe to reset this register
 320	 */
 321	if (en)
 322		ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 323	else
 324		ret = sdw_write(s_rt->slave, addr, 0x0);
 325
 326	if (ret < 0)
 327		dev_err(&s_rt->slave->dev,
 328			"Slave chn_en reg write failed:%d port:%d\n",
 329			ret, t_params->port_num);
 330
 331	return ret;
 332}
 333
 334static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
 335					   struct sdw_port_runtime *p_rt,
 336					   bool en)
 337{
 338	struct sdw_transport_params *t_params = &p_rt->transport_params;
 339	struct sdw_bus *bus = m_rt->bus;
 340	struct sdw_enable_ch enable_ch;
 341	int ret;
 342
 343	enable_ch.port_num = p_rt->num;
 344	enable_ch.ch_mask = p_rt->ch_mask;
 345	enable_ch.enable = en;
 346
 347	/* Perform Master port channel(s) enable/disable */
 348	if (bus->port_ops->dpn_port_enable_ch) {
 349		ret = bus->port_ops->dpn_port_enable_ch(bus,
 350							&enable_ch,
 351							bus->params.next_bank);
 352		if (ret < 0) {
 353			dev_err(bus->dev,
 354				"Master chn_en write failed:%d port:%d\n",
 355				ret, t_params->port_num);
 356			return ret;
 357		}
 358	} else {
 359		dev_err(bus->dev,
 360			"dpn_port_enable_ch not supported, %s failed\n",
 361			en ? "enable" : "disable");
 362		return -EINVAL;
 363	}
 364
 365	return 0;
 366}
 367
 368/**
 369 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
 370 * Slave(s)
 371 *
 372 * @m_rt: Master stream runtime
 373 * @en: mode (enable/disable)
 374 */
 375static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
 376{
 377	struct sdw_port_runtime *s_port, *m_port;
 378	struct sdw_slave_runtime *s_rt;
 379	int ret = 0;
 380
 381	/* Enable/Disable Slave port(s) */
 382	list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 383		list_for_each_entry(s_port, &s_rt->port_list, port_node) {
 384			ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
 385							     s_port, en);
 386			if (ret < 0)
 387				return ret;
 388		}
 389	}
 390
 391	/* Enable/Disable Master port(s) */
 392	list_for_each_entry(m_port, &m_rt->port_list, port_node) {
 393		ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
 394		if (ret < 0)
 395			return ret;
 396	}
 397
 398	return 0;
 399}
 400
 401static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
 402			    struct sdw_prepare_ch prep_ch,
 403			    enum sdw_port_prep_ops cmd)
 404{
 405	int ret = 0;
 406	struct sdw_slave *slave = s_rt->slave;
 407
 408	mutex_lock(&slave->sdw_dev_lock);
 409
 410	if (slave->probed) {
 411		struct device *dev = &slave->dev;
 412		struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 413
 414		if (drv->ops && drv->ops->port_prep) {
 415			ret = drv->ops->port_prep(slave, &prep_ch, cmd);
 416			if (ret < 0)
 417				dev_err(dev, "Slave Port Prep cmd %d failed: %d\n",
 418					cmd, ret);
 
 
 419		}
 420	}
 421
 422	mutex_unlock(&slave->sdw_dev_lock);
 423
 424	return ret;
 425}
 426
 427static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 428				       struct sdw_slave_runtime *s_rt,
 429				       struct sdw_port_runtime *p_rt,
 430				       bool prep)
 431{
 432	struct completion *port_ready;
 433	struct sdw_dpn_prop *dpn_prop;
 434	struct sdw_prepare_ch prep_ch;
 435	bool intr = false;
 436	int ret = 0, val;
 437	u32 addr;
 438
 439	prep_ch.num = p_rt->num;
 440	prep_ch.ch_mask = p_rt->ch_mask;
 441
 442	dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 443					  s_rt->direction,
 444					  prep_ch.num);
 445	if (!dpn_prop) {
 446		dev_err(bus->dev,
 447			"Slave Port:%d properties not found\n", prep_ch.num);
 448		return -EINVAL;
 449	}
 450
 451	prep_ch.prepare = prep;
 452
 453	prep_ch.bank = bus->params.next_bank;
 454
 455	if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
 456	    bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
 457		intr = true;
 458
 459	/*
 460	 * Enable interrupt before Port prepare.
 461	 * For Port de-prepare, it is assumed that port
 462	 * was prepared earlier
 463	 */
 464	if (prep && intr) {
 465		ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 466					     dpn_prop->imp_def_interrupts);
 467		if (ret < 0)
 468			return ret;
 469	}
 470
 471	/* Inform slave about the impending port prepare */
 472	sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
 473
 474	/* Prepare Slave port implementing CP_SM */
 475	if (!dpn_prop->simple_ch_prep_sm) {
 476		addr = SDW_DPN_PREPARECTRL(p_rt->num);
 477
 478		if (prep)
 479			ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 480		else
 481			ret = sdw_write(s_rt->slave, addr, 0x0);
 482
 483		if (ret < 0) {
 484			dev_err(&s_rt->slave->dev,
 485				"Slave prep_ctrl reg write failed\n");
 486			return ret;
 487		}
 488
 489		/* Wait for completion on port ready */
 490		port_ready = &s_rt->slave->port_ready[prep_ch.num];
 491		wait_for_completion_timeout(port_ready,
 492			msecs_to_jiffies(dpn_prop->ch_prep_timeout));
 493
 494		val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
 495		if ((val < 0) || (val & p_rt->ch_mask)) {
 496			ret = (val < 0) ? val : -ETIMEDOUT;
 497			dev_err(&s_rt->slave->dev,
 498				"Chn prep failed for port %d: %d\n", prep_ch.num, ret);
 499			return ret;
 500		}
 501	}
 502
 503	/* Inform slaves about ports prepared */
 504	sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
 505
 506	/* Disable interrupt after Port de-prepare */
 507	if (!prep && intr)
 508		ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 509					     dpn_prop->imp_def_interrupts);
 510
 511	return ret;
 512}
 513
 514static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
 515					struct sdw_port_runtime *p_rt,
 516					bool prep)
 517{
 518	struct sdw_transport_params *t_params = &p_rt->transport_params;
 519	struct sdw_bus *bus = m_rt->bus;
 520	const struct sdw_master_port_ops *ops = bus->port_ops;
 521	struct sdw_prepare_ch prep_ch;
 522	int ret = 0;
 523
 524	prep_ch.num = p_rt->num;
 525	prep_ch.ch_mask = p_rt->ch_mask;
 526	prep_ch.prepare = prep; /* Prepare/De-prepare */
 527	prep_ch.bank = bus->params.next_bank;
 528
 529	/* Pre-prepare/Pre-deprepare port(s) */
 530	if (ops->dpn_port_prep) {
 531		ret = ops->dpn_port_prep(bus, &prep_ch);
 532		if (ret < 0) {
 533			dev_err(bus->dev, "Port prepare failed for port:%d\n",
 534				t_params->port_num);
 535			return ret;
 536		}
 537	}
 538
 539	return ret;
 540}
 541
 542/**
 543 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
 544 * Slave(s)
 545 *
 546 * @m_rt: Master runtime handle
 547 * @prep: Prepare or De-prepare
 548 */
 549static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
 550{
 551	struct sdw_slave_runtime *s_rt;
 552	struct sdw_port_runtime *p_rt;
 553	int ret = 0;
 554
 555	/* Prepare/De-prepare Slave port(s) */
 556	list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 557		list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 558			ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
 559							  p_rt, prep);
 560			if (ret < 0)
 561				return ret;
 562		}
 563	}
 564
 565	/* Prepare/De-prepare Master port(s) */
 566	list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 567		ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
 568		if (ret < 0)
 569			return ret;
 570	}
 571
 572	return ret;
 573}
 574
 575/**
 576 * sdw_notify_config() - Notify bus configuration
 577 *
 578 * @m_rt: Master runtime handle
 579 *
 580 * This function notifies the Master(s) and Slave(s) of the
 581 * new bus configuration.
 582 */
 583static int sdw_notify_config(struct sdw_master_runtime *m_rt)
 584{
 585	struct sdw_slave_runtime *s_rt;
 586	struct sdw_bus *bus = m_rt->bus;
 587	struct sdw_slave *slave;
 588	int ret;
 589
 590	if (bus->ops->set_bus_conf) {
 591		ret = bus->ops->set_bus_conf(bus, &bus->params);
 592		if (ret < 0)
 593			return ret;
 594	}
 595
 596	list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 597		slave = s_rt->slave;
 598
 599		mutex_lock(&slave->sdw_dev_lock);
 600
 601		if (slave->probed) {
 602			struct device *dev = &slave->dev;
 603			struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 604
 605			if (drv->ops && drv->ops->bus_config) {
 606				ret = drv->ops->bus_config(slave, &bus->params);
 607				if (ret < 0) {
 608					dev_err(dev, "Notify Slave: %d failed\n",
 609						slave->dev_num);
 610					mutex_unlock(&slave->sdw_dev_lock);
 611					return ret;
 612				}
 613			}
 614		}
 615
 616		mutex_unlock(&slave->sdw_dev_lock);
 617	}
 618
 619	return 0;
 620}
 621
 622/**
 623 * sdw_program_params() - Program transport and port parameters for Master(s)
 624 * and Slave(s)
 625 *
 626 * @bus: SDW bus instance
 627 * @prepare: true if sdw_program_params() is called by _prepare.
 628 */
 629static int sdw_program_params(struct sdw_bus *bus, bool prepare)
 630{
 631	struct sdw_master_runtime *m_rt;
 632	int ret = 0;
 633
 634	list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 635
 636		/*
 637		 * this loop walks through all master runtimes for a
 638		 * bus, but the ports can only be configured while
 639		 * explicitly preparing a stream or handling an
 640		 * already-prepared stream otherwise.
 641		 */
 642		if (!prepare &&
 643		    m_rt->stream->state == SDW_STREAM_CONFIGURED)
 644			continue;
 645
 646		ret = sdw_program_port_params(m_rt);
 647		if (ret < 0) {
 648			dev_err(bus->dev,
 649				"Program transport params failed: %d\n", ret);
 650			return ret;
 651		}
 652
 653		ret = sdw_notify_config(m_rt);
 654		if (ret < 0) {
 655			dev_err(bus->dev,
 656				"Notify bus config failed: %d\n", ret);
 657			return ret;
 658		}
 659
 660		/* Enable port(s) on alternate bank for all active streams */
 661		if (m_rt->stream->state != SDW_STREAM_ENABLED)
 662			continue;
 663
 664		ret = sdw_enable_disable_ports(m_rt, true);
 665		if (ret < 0) {
 666			dev_err(bus->dev, "Enable channel failed: %d\n", ret);
 667			return ret;
 668		}
 669	}
 670
 671	return ret;
 672}
 673
 674static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 675{
 676	int col_index, row_index;
 677	bool multi_link;
 678	struct sdw_msg *wr_msg;
 679	u8 *wbuf;
 680	int ret;
 681	u16 addr;
 682
 683	wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
 684	if (!wr_msg)
 685		return -ENOMEM;
 686
 687	bus->defer_msg.msg = wr_msg;
 688
 689	wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
 690	if (!wbuf) {
 691		ret = -ENOMEM;
 692		goto error_1;
 693	}
 694
 695	/* Get row and column index to program register */
 696	col_index = sdw_find_col_index(bus->params.col);
 697	row_index = sdw_find_row_index(bus->params.row);
 698	wbuf[0] = col_index | (row_index << 3);
 699
 700	if (bus->params.next_bank)
 701		addr = SDW_SCP_FRAMECTRL_B1;
 702	else
 703		addr = SDW_SCP_FRAMECTRL_B0;
 704
 705	sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
 706		     SDW_MSG_FLAG_WRITE, wbuf);
 707	wr_msg->ssp_sync = true;
 708
 709	/*
 710	 * Set the multi_link flag only when both the hardware supports
 711	 * and hardware-based sync is required
 712	 */
 713	multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
 714
 715	if (multi_link)
 716		ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
 717	else
 718		ret = sdw_transfer(bus, wr_msg);
 719
 720	if (ret < 0 && ret != -ENODATA) {
 721		dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
 722		goto error;
 723	}
 724
 725	if (!multi_link) {
 726		kfree(wr_msg);
 727		kfree(wbuf);
 728		bus->defer_msg.msg = NULL;
 729		bus->params.curr_bank = !bus->params.curr_bank;
 730		bus->params.next_bank = !bus->params.next_bank;
 731	}
 732
 733	return 0;
 734
 735error:
 736	kfree(wbuf);
 737error_1:
 738	kfree(wr_msg);
 739	bus->defer_msg.msg = NULL;
 740	return ret;
 741}
 742
 743/**
 744 * sdw_ml_sync_bank_switch: Multilink register bank switch
 745 *
 746 * @bus: SDW bus instance
 747 *
 748 * Caller function should free the buffers on error
 749 */
 750static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
 751{
 752	unsigned long time_left;
 753
 754	if (!bus->multi_link)
 755		return 0;
 756
 757	/* Wait for completion of transfer */
 758	time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 759						bus->bank_switch_timeout);
 760
 761	if (!time_left) {
 762		dev_err(bus->dev, "Controller Timed out on bank switch\n");
 763		return -ETIMEDOUT;
 764	}
 765
 766	bus->params.curr_bank = !bus->params.curr_bank;
 767	bus->params.next_bank = !bus->params.next_bank;
 768
 769	if (bus->defer_msg.msg) {
 770		kfree(bus->defer_msg.msg->buf);
 771		kfree(bus->defer_msg.msg);
 772	}
 773
 774	return 0;
 775}
 776
 777static int do_bank_switch(struct sdw_stream_runtime *stream)
 778{
 779	struct sdw_master_runtime *m_rt;
 780	const struct sdw_master_ops *ops;
 781	struct sdw_bus *bus;
 782	bool multi_link = false;
 783	int m_rt_count;
 784	int ret = 0;
 785
 786	m_rt_count = stream->m_rt_count;
 787
 788	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 789		bus = m_rt->bus;
 790		ops = bus->ops;
 791
 792		if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
 793			multi_link = true;
 794			mutex_lock(&bus->msg_lock);
 795		}
 796
 797		/* Pre-bank switch */
 798		if (ops->pre_bank_switch) {
 799			ret = ops->pre_bank_switch(bus);
 800			if (ret < 0) {
 801				dev_err(bus->dev,
 802					"Pre bank switch op failed: %d\n", ret);
 803				goto msg_unlock;
 804			}
 805		}
 806
 807		/*
 808		 * Perform Bank switch operation.
 809		 * For multi link cases, the actual bank switch is
 810		 * synchronized across all Masters and happens later as a
 811		 * part of post_bank_switch ops.
 812		 */
 813		ret = sdw_bank_switch(bus, m_rt_count);
 814		if (ret < 0) {
 815			dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 816			goto error;
 817		}
 818	}
 819
 820	/*
 821	 * For multi link cases, it is expected that the bank switch is
 822	 * triggered by the post_bank_switch for the first Master in the list
 823	 * and for the other Masters the post_bank_switch() should return doing
 824	 * nothing.
 825	 */
 826	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 827		bus = m_rt->bus;
 828		ops = bus->ops;
 829
 830		/* Post-bank switch */
 831		if (ops->post_bank_switch) {
 832			ret = ops->post_bank_switch(bus);
 833			if (ret < 0) {
 834				dev_err(bus->dev,
 835					"Post bank switch op failed: %d\n",
 836					ret);
 837				goto error;
 838			}
 839		} else if (multi_link) {
 840			dev_err(bus->dev,
 841				"Post bank switch ops not implemented\n");
 842			ret = -EINVAL;
 843			goto error;
 844		}
 845
 846		/* Set the bank switch timeout to default, if not set */
 847		if (!bus->bank_switch_timeout)
 848			bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 849
 850		/* Check if bank switch was successful */
 851		ret = sdw_ml_sync_bank_switch(bus);
 852		if (ret < 0) {
 853			dev_err(bus->dev,
 854				"multi link bank switch failed: %d\n", ret);
 855			goto error;
 856		}
 857
 858		if (multi_link)
 859			mutex_unlock(&bus->msg_lock);
 860	}
 861
 862	return ret;
 863
 864error:
 865	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 866		bus = m_rt->bus;
 867		if (bus->defer_msg.msg) {
 868			kfree(bus->defer_msg.msg->buf);
 869			kfree(bus->defer_msg.msg);
 870		}
 871	}
 872
 873msg_unlock:
 874
 875	if (multi_link) {
 876		list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 877			bus = m_rt->bus;
 878			if (mutex_is_locked(&bus->msg_lock))
 879				mutex_unlock(&bus->msg_lock);
 880		}
 881	}
 882
 883	return ret;
 884}
 885
 886static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
 
 
 
 
 
 
 
 887{
 888	struct sdw_port_runtime *p_rt;
 889
 890	p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
 891	if (!p_rt)
 892		return NULL;
 893
 894	list_add_tail(&p_rt->port_node, port_list);
 895
 896	return p_rt;
 897}
 
 898
 899static int sdw_port_config(struct sdw_port_runtime *p_rt,
 900			   struct sdw_port_config *port_config,
 901			   int port_index)
 
 
 
 
 
 
 
 902{
 903	p_rt->ch_mask = port_config[port_index].ch_mask;
 904	p_rt->num = port_config[port_index].num;
 905
 906	/*
 907	 * TODO: Check port capabilities for requested configuration
 908	 */
 909
 910	return 0;
 911}
 
 912
 913static void sdw_port_free(struct sdw_port_runtime *p_rt)
 914{
 915	list_del(&p_rt->port_node);
 916	kfree(p_rt);
 917}
 918
 919static bool sdw_slave_port_allocated(struct sdw_slave_runtime *s_rt)
 920{
 921	return !list_empty(&s_rt->port_list);
 922}
 
 923
 924static void sdw_slave_port_free(struct sdw_slave *slave,
 925				struct sdw_stream_runtime *stream)
 
 926{
 927	struct sdw_port_runtime *p_rt, *_p_rt;
 928	struct sdw_master_runtime *m_rt;
 929	struct sdw_slave_runtime *s_rt;
 930
 
 931	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 932		list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 933			if (s_rt->slave != slave)
 934				continue;
 935
 936			list_for_each_entry_safe(p_rt, _p_rt,
 937						 &s_rt->port_list, port_node) {
 938				sdw_port_free(p_rt);
 939			}
 940		}
 941	}
 942}
 943
 944static int sdw_slave_port_alloc(struct sdw_slave *slave,
 945				struct sdw_slave_runtime *s_rt,
 946				unsigned int num_config)
 947{
 948	struct sdw_port_runtime *p_rt;
 949	int i;
 950
 951	/* Iterate for number of ports to perform initialization */
 952	for (i = 0; i < num_config; i++) {
 953		p_rt = sdw_port_alloc(&s_rt->port_list);
 954		if (!p_rt)
 955			return -ENOMEM;
 956	}
 957
 958	return 0;
 959}
 960
 961static int sdw_slave_port_is_valid_range(struct device *dev, int num)
 962{
 963	if (!SDW_VALID_PORT_RANGE(num)) {
 964		dev_err(dev, "SoundWire: Invalid port number :%d\n", num);
 965		return -EINVAL;
 966	}
 967
 968	return 0;
 969}
 970
 971static int sdw_slave_port_config(struct sdw_slave *slave,
 972				 struct sdw_slave_runtime *s_rt,
 973				 struct sdw_port_config *port_config)
 974{
 975	struct sdw_port_runtime *p_rt;
 976	int ret;
 977	int i;
 978
 979	i = 0;
 980	list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 981		/*
 982		 * TODO: Check valid port range as defined by DisCo/
 983		 * slave
 984		 */
 985		ret = sdw_slave_port_is_valid_range(&slave->dev, port_config[i].num);
 986		if (ret < 0)
 987			return ret;
 988
 989		ret = sdw_port_config(p_rt, port_config, i);
 990		if (ret < 0)
 991			return ret;
 992		i++;
 993	}
 994
 995	return 0;
 996}
 997
 998static bool sdw_master_port_allocated(struct sdw_master_runtime *m_rt)
 999{
1000	return !list_empty(&m_rt->port_list);
1001}
1002
1003static void sdw_master_port_free(struct sdw_master_runtime *m_rt)
 
 
 
 
 
 
 
 
 
 
 
 
1004{
1005	struct sdw_port_runtime *p_rt, *_p_rt;
1006
1007	list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1008		sdw_port_free(p_rt);
1009	}
1010}
1011
1012static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
1013				 unsigned int num_ports)
1014{
1015	struct sdw_port_runtime *p_rt;
1016	int i;
 
 
1017
1018	/* Iterate for number of ports to perform initialization */
1019	for (i = 0; i < num_ports; i++) {
1020		p_rt = sdw_port_alloc(&m_rt->port_list);
1021		if (!p_rt)
1022			return -ENOMEM;
1023	}
1024
1025	return 0;
1026}
 
 
1027
1028static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
1029				  struct sdw_port_config *port_config)
1030{
1031	struct sdw_port_runtime *p_rt;
1032	int ret;
1033	int i;
1034
1035	i = 0;
1036	list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1037		ret = sdw_port_config(p_rt, port_config, i);
1038		if (ret < 0)
1039			return ret;
1040		i++;
1041	}
1042
1043	return 0;
1044}
1045
1046/**
1047 * sdw_slave_rt_alloc() - Allocate a Slave runtime handle.
1048 *
1049 * @slave: Slave handle
1050 * @m_rt: Master runtime handle
 
1051 *
1052 * This function is to be called with bus_lock held.
1053 */
1054static struct sdw_slave_runtime
1055*sdw_slave_rt_alloc(struct sdw_slave *slave,
1056		    struct sdw_master_runtime *m_rt)
 
1057{
1058	struct sdw_slave_runtime *s_rt;
1059
1060	s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1061	if (!s_rt)
1062		return NULL;
1063
1064	INIT_LIST_HEAD(&s_rt->port_list);
 
 
1065	s_rt->slave = slave;
1066
1067	list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1068
1069	return s_rt;
1070}
1071
1072/**
1073 * sdw_slave_rt_config() - Configure a Slave runtime handle.
1074 *
1075 * @s_rt: Slave runtime handle
1076 * @stream_config: Stream configuration
1077 *
1078 * This function is to be called with bus_lock held.
1079 */
1080static int sdw_slave_rt_config(struct sdw_slave_runtime *s_rt,
1081			       struct sdw_stream_config *stream_config)
1082{
1083	s_rt->ch_count = stream_config->ch_count;
1084	s_rt->direction = stream_config->direction;
1085
1086	return 0;
 
 
 
1087}
1088
1089static struct sdw_slave_runtime *sdw_slave_rt_find(struct sdw_slave *slave,
1090						   struct sdw_stream_runtime *stream)
 
1091{
1092	struct sdw_slave_runtime *s_rt, *_s_rt;
1093	struct sdw_master_runtime *m_rt;
 
1094
1095	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1096		/* Retrieve Slave runtime handle */
1097		list_for_each_entry_safe(s_rt, _s_rt,
1098					 &m_rt->slave_rt_list, m_rt_node) {
1099			if (s_rt->slave == slave)
1100				return s_rt;
 
 
 
 
1101		}
1102	}
1103	return NULL;
1104}
1105
1106/**
1107 * sdw_slave_rt_free() - Free Slave(s) runtime handle
1108 *
1109 * @slave: Slave handle.
1110 * @stream: Stream runtime handle.
1111 *
1112 * This function is to be called with bus_lock held.
1113 */
1114static void sdw_slave_rt_free(struct sdw_slave *slave,
1115			      struct sdw_stream_runtime *stream)
1116{
1117	struct sdw_slave_runtime *s_rt;
1118
1119	s_rt = sdw_slave_rt_find(slave, stream);
1120	if (s_rt) {
1121		list_del(&s_rt->m_rt_node);
1122		kfree(s_rt);
1123	}
1124}
1125
1126static struct sdw_master_runtime
1127*sdw_master_rt_find(struct sdw_bus *bus,
1128		    struct sdw_stream_runtime *stream)
1129{
 
1130	struct sdw_master_runtime *m_rt;
1131
1132	/* Retrieve Bus handle if already available */
1133	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1134		if (m_rt->bus == bus)
1135			return m_rt;
 
 
 
 
 
 
 
1136	}
1137
1138	return NULL;
1139}
1140
1141/**
1142 * sdw_master_rt_alloc() - Allocates a Master runtime handle
1143 *
1144 * @bus: SDW bus instance
1145 * @stream: Stream runtime handle.
1146 *
1147 * This function is to be called with bus_lock held.
 
 
 
1148 */
1149static struct sdw_master_runtime
1150*sdw_master_rt_alloc(struct sdw_bus *bus,
1151		     struct sdw_stream_runtime *stream)
1152{
1153	struct sdw_master_runtime *m_rt;
1154
1155	m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
1156	if (!m_rt)
1157		return NULL;
1158
1159	/* Initialization of Master runtime handle */
1160	INIT_LIST_HEAD(&m_rt->port_list);
1161	INIT_LIST_HEAD(&m_rt->slave_rt_list);
1162	list_add_tail(&m_rt->stream_node, &stream->master_list);
1163
1164	list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
1165
1166	m_rt->bus = bus;
1167	m_rt->stream = stream;
 
 
1168
1169	return m_rt;
 
 
1170}
1171
1172/**
1173 * sdw_master_rt_config() - Configure Master runtime handle
1174 *
1175 * @m_rt: Master runtime handle
1176 * @stream_config: Stream configuration
1177 *
1178 * This function is to be called with bus_lock held.
1179 */
1180
1181static int sdw_master_rt_config(struct sdw_master_runtime *m_rt,
1182				struct sdw_stream_config *stream_config)
1183{
1184	m_rt->ch_count = stream_config->ch_count;
1185	m_rt->direction = stream_config->direction;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1186
1187	return 0;
1188}
 
1189
1190/**
1191 * sdw_master_rt_free() - Free Master runtime handle
1192 *
1193 * @m_rt: Master runtime node
1194 * @stream: Stream runtime handle.
1195 *
1196 * This function is to be called with bus_lock held
1197 * It frees the Master runtime handle and associated Slave(s) runtime
1198 * handle. If this is called first then sdw_slave_rt_free() will have
1199 * no effect as Slave(s) runtime handle would already be freed up.
1200 */
1201static void sdw_master_rt_free(struct sdw_master_runtime *m_rt,
1202			       struct sdw_stream_runtime *stream)
1203{
1204	struct sdw_slave_runtime *s_rt, *_s_rt;
1205
1206	list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1207		sdw_slave_port_free(s_rt->slave, stream);
1208		sdw_slave_rt_free(s_rt->slave, stream);
1209	}
1210
1211	list_del(&m_rt->stream_node);
1212	list_del(&m_rt->bus_node);
1213	kfree(m_rt);
1214}
 
1215
1216/**
1217 * sdw_config_stream() - Configure the allocated stream
1218 *
1219 * @dev: SDW device
1220 * @stream: SoundWire stream
1221 * @stream_config: Stream configuration for audio stream
1222 * @is_slave: is API called from Slave or Master
1223 *
1224 * This function is to be called with bus_lock held.
1225 */
1226static int sdw_config_stream(struct device *dev,
1227			     struct sdw_stream_runtime *stream,
1228			     struct sdw_stream_config *stream_config,
1229			     bool is_slave)
1230{
1231	/*
1232	 * Update the stream rate, channel and bps based on data
1233	 * source. For more than one data source (multilink),
1234	 * match the rate, bps, stream type and increment number of channels.
1235	 *
1236	 * If rate/bps is zero, it means the values are not set, so skip
1237	 * comparison and allow the value to be set and stored in stream
1238	 */
1239	if (stream->params.rate &&
1240	    stream->params.rate != stream_config->frame_rate) {
1241		dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1242		return -EINVAL;
1243	}
1244
1245	if (stream->params.bps &&
1246	    stream->params.bps != stream_config->bps) {
1247		dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1248		return -EINVAL;
1249	}
1250
1251	stream->type = stream_config->type;
1252	stream->params.rate = stream_config->frame_rate;
1253	stream->params.bps = stream_config->bps;
1254
1255	/* TODO: Update this check during Device-device support */
1256	if (is_slave)
1257		stream->params.ch_count += stream_config->ch_count;
1258
1259	return 0;
1260}
1261
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1262/**
1263 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1264 *
1265 * @slave: Slave handle
1266 * @direction: Data direction.
1267 * @port_num: Port number
1268 */
1269struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1270					    enum sdw_data_direction direction,
1271					    unsigned int port_num)
1272{
1273	struct sdw_dpn_prop *dpn_prop;
1274	u8 num_ports;
1275	int i;
1276
1277	if (direction == SDW_DATA_DIR_TX) {
1278		num_ports = hweight32(slave->prop.source_ports);
1279		dpn_prop = slave->prop.src_dpn_prop;
1280	} else {
1281		num_ports = hweight32(slave->prop.sink_ports);
1282		dpn_prop = slave->prop.sink_dpn_prop;
1283	}
1284
1285	for (i = 0; i < num_ports; i++) {
1286		if (dpn_prop[i].num == port_num)
1287			return &dpn_prop[i];
1288	}
1289
1290	return NULL;
1291}
1292
1293/**
1294 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1295 *
1296 * @stream: SoundWire stream
1297 *
1298 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1299 * stream to reconfigure the bus.
1300 * NOTE: This function is called from SoundWire stream ops and is
1301 * expected that a global lock is held before acquiring bus_lock.
1302 */
1303static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1304{
1305	struct sdw_master_runtime *m_rt;
1306	struct sdw_bus *bus;
1307
1308	/* Iterate for all Master(s) in Master list */
1309	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1310		bus = m_rt->bus;
1311
1312		mutex_lock(&bus->bus_lock);
1313	}
1314}
1315
1316/**
1317 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1318 *
1319 * @stream: SoundWire stream
1320 *
1321 * Release the previously held bus_lock after reconfiguring the bus.
1322 * NOTE: This function is called from SoundWire stream ops and is
1323 * expected that a global lock is held before releasing bus_lock.
1324 */
1325static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1326{
1327	struct sdw_master_runtime *m_rt;
1328	struct sdw_bus *bus;
1329
1330	/* Iterate for all Master(s) in Master list */
1331	list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1332		bus = m_rt->bus;
1333		mutex_unlock(&bus->bus_lock);
1334	}
1335}
1336
1337static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1338			       bool update_params)
1339{
1340	struct sdw_master_runtime *m_rt;
1341	struct sdw_bus *bus = NULL;
1342	struct sdw_master_prop *prop;
1343	struct sdw_bus_params params;
1344	int ret;
1345
1346	/* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1347	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1348		bus = m_rt->bus;
1349		prop = &bus->prop;
1350		memcpy(&params, &bus->params, sizeof(params));
1351
1352		/* TODO: Support Asynchronous mode */
1353		if ((prop->max_clk_freq % stream->params.rate) != 0) {
1354			dev_err(bus->dev, "Async mode not supported\n");
1355			return -EINVAL;
1356		}
1357
1358		if (!update_params)
1359			goto program_params;
1360
1361		/* Increment cumulative bus bandwidth */
1362		/* TODO: Update this during Device-Device support */
1363		bus->params.bandwidth += m_rt->stream->params.rate *
1364			m_rt->ch_count * m_rt->stream->params.bps;
1365
1366		/* Compute params */
1367		if (bus->compute_params) {
1368			ret = bus->compute_params(bus);
1369			if (ret < 0) {
1370				dev_err(bus->dev, "Compute params failed: %d\n",
1371					ret);
1372				return ret;
1373			}
1374		}
1375
1376program_params:
1377		/* Program params */
1378		ret = sdw_program_params(bus, true);
1379		if (ret < 0) {
1380			dev_err(bus->dev, "Program params failed: %d\n", ret);
1381			goto restore_params;
1382		}
1383	}
1384
1385	if (!bus) {
1386		pr_err("Configuration error in %s\n", __func__);
1387		return -EINVAL;
1388	}
1389
1390	ret = do_bank_switch(stream);
1391	if (ret < 0) {
1392		dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1393		goto restore_params;
1394	}
1395
1396	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1397		bus = m_rt->bus;
1398
1399		/* Prepare port(s) on the new clock configuration */
1400		ret = sdw_prep_deprep_ports(m_rt, true);
1401		if (ret < 0) {
1402			dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1403				ret);
1404			return ret;
1405		}
1406	}
1407
1408	stream->state = SDW_STREAM_PREPARED;
1409
1410	return ret;
1411
1412restore_params:
1413	memcpy(&bus->params, &params, sizeof(params));
1414	return ret;
1415}
1416
1417/**
1418 * sdw_prepare_stream() - Prepare SoundWire stream
1419 *
1420 * @stream: Soundwire stream
1421 *
1422 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1423 */
1424int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1425{
1426	bool update_params = true;
1427	int ret;
1428
1429	if (!stream) {
1430		pr_err("SoundWire: Handle not found for stream\n");
1431		return -EINVAL;
1432	}
1433
1434	sdw_acquire_bus_lock(stream);
1435
1436	if (stream->state == SDW_STREAM_PREPARED) {
1437		ret = 0;
1438		goto state_err;
1439	}
1440
1441	if (stream->state != SDW_STREAM_CONFIGURED &&
1442	    stream->state != SDW_STREAM_DEPREPARED &&
1443	    stream->state != SDW_STREAM_DISABLED) {
1444		pr_err("%s: %s: inconsistent state state %d\n",
1445		       __func__, stream->name, stream->state);
1446		ret = -EINVAL;
1447		goto state_err;
1448	}
1449
1450	/*
1451	 * when the stream is DISABLED, this means sdw_prepare_stream()
1452	 * is called as a result of an underflow or a resume operation.
1453	 * In this case, the bus parameters shall not be recomputed, but
1454	 * still need to be re-applied
1455	 */
1456	if (stream->state == SDW_STREAM_DISABLED)
1457		update_params = false;
1458
1459	ret = _sdw_prepare_stream(stream, update_params);
1460
1461state_err:
1462	sdw_release_bus_lock(stream);
1463	return ret;
1464}
1465EXPORT_SYMBOL(sdw_prepare_stream);
1466
1467static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1468{
1469	struct sdw_master_runtime *m_rt;
1470	struct sdw_bus *bus = NULL;
1471	int ret;
1472
1473	/* Enable Master(s) and Slave(s) port(s) associated with stream */
1474	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1475		bus = m_rt->bus;
1476
1477		/* Program params */
1478		ret = sdw_program_params(bus, false);
1479		if (ret < 0) {
1480			dev_err(bus->dev, "Program params failed: %d\n", ret);
1481			return ret;
1482		}
1483
1484		/* Enable port(s) */
1485		ret = sdw_enable_disable_ports(m_rt, true);
1486		if (ret < 0) {
1487			dev_err(bus->dev,
1488				"Enable port(s) failed ret: %d\n", ret);
1489			return ret;
1490		}
1491	}
1492
1493	if (!bus) {
1494		pr_err("Configuration error in %s\n", __func__);
1495		return -EINVAL;
1496	}
1497
1498	ret = do_bank_switch(stream);
1499	if (ret < 0) {
1500		dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1501		return ret;
1502	}
1503
1504	stream->state = SDW_STREAM_ENABLED;
1505	return 0;
1506}
1507
1508/**
1509 * sdw_enable_stream() - Enable SoundWire stream
1510 *
1511 * @stream: Soundwire stream
1512 *
1513 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1514 */
1515int sdw_enable_stream(struct sdw_stream_runtime *stream)
1516{
1517	int ret;
1518
1519	if (!stream) {
1520		pr_err("SoundWire: Handle not found for stream\n");
1521		return -EINVAL;
1522	}
1523
1524	sdw_acquire_bus_lock(stream);
1525
1526	if (stream->state == SDW_STREAM_ENABLED) {
1527		ret = 0;
1528		goto state_err;
1529	}
1530
1531	if (stream->state != SDW_STREAM_PREPARED &&
1532	    stream->state != SDW_STREAM_DISABLED) {
1533		pr_err("%s: %s: inconsistent state state %d\n",
1534		       __func__, stream->name, stream->state);
1535		ret = -EINVAL;
1536		goto state_err;
1537	}
1538
1539	ret = _sdw_enable_stream(stream);
1540
1541state_err:
1542	sdw_release_bus_lock(stream);
1543	return ret;
1544}
1545EXPORT_SYMBOL(sdw_enable_stream);
1546
1547static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1548{
1549	struct sdw_master_runtime *m_rt;
1550	int ret;
1551
1552	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1553		struct sdw_bus *bus = m_rt->bus;
1554
1555		/* Disable port(s) */
1556		ret = sdw_enable_disable_ports(m_rt, false);
1557		if (ret < 0) {
1558			dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1559			return ret;
1560		}
1561	}
1562	stream->state = SDW_STREAM_DISABLED;
1563
1564	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1565		struct sdw_bus *bus = m_rt->bus;
1566
1567		/* Program params */
1568		ret = sdw_program_params(bus, false);
1569		if (ret < 0) {
1570			dev_err(bus->dev, "Program params failed: %d\n", ret);
1571			return ret;
1572		}
1573	}
1574
1575	ret = do_bank_switch(stream);
1576	if (ret < 0) {
1577		pr_err("Bank switch failed: %d\n", ret);
1578		return ret;
1579	}
1580
1581	/* make sure alternate bank (previous current) is also disabled */
1582	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1583		struct sdw_bus *bus = m_rt->bus;
1584
1585		/* Disable port(s) */
1586		ret = sdw_enable_disable_ports(m_rt, false);
1587		if (ret < 0) {
1588			dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1589			return ret;
1590		}
1591	}
1592
1593	return 0;
1594}
1595
1596/**
1597 * sdw_disable_stream() - Disable SoundWire stream
1598 *
1599 * @stream: Soundwire stream
1600 *
1601 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1602 */
1603int sdw_disable_stream(struct sdw_stream_runtime *stream)
1604{
1605	int ret;
1606
1607	if (!stream) {
1608		pr_err("SoundWire: Handle not found for stream\n");
1609		return -EINVAL;
1610	}
1611
1612	sdw_acquire_bus_lock(stream);
1613
1614	if (stream->state == SDW_STREAM_DISABLED) {
1615		ret = 0;
1616		goto state_err;
1617	}
1618
1619	if (stream->state != SDW_STREAM_ENABLED) {
1620		pr_err("%s: %s: inconsistent state state %d\n",
1621		       __func__, stream->name, stream->state);
1622		ret = -EINVAL;
1623		goto state_err;
1624	}
1625
1626	ret = _sdw_disable_stream(stream);
1627
1628state_err:
1629	sdw_release_bus_lock(stream);
1630	return ret;
1631}
1632EXPORT_SYMBOL(sdw_disable_stream);
1633
1634static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1635{
1636	struct sdw_master_runtime *m_rt;
1637	struct sdw_bus *bus;
1638	int ret = 0;
1639
1640	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1641		bus = m_rt->bus;
1642		/* De-prepare port(s) */
1643		ret = sdw_prep_deprep_ports(m_rt, false);
1644		if (ret < 0) {
1645			dev_err(bus->dev,
1646				"De-prepare port(s) failed: %d\n", ret);
1647			return ret;
1648		}
1649
1650		/* TODO: Update this during Device-Device support */
1651		bus->params.bandwidth -= m_rt->stream->params.rate *
1652			m_rt->ch_count * m_rt->stream->params.bps;
1653
1654		/* Compute params */
1655		if (bus->compute_params) {
1656			ret = bus->compute_params(bus);
1657			if (ret < 0) {
1658				dev_err(bus->dev, "Compute params failed: %d\n",
1659					ret);
1660				return ret;
1661			}
1662		}
1663
1664		/* Program params */
1665		ret = sdw_program_params(bus, false);
1666		if (ret < 0) {
1667			dev_err(bus->dev, "Program params failed: %d\n", ret);
1668			return ret;
1669		}
1670	}
1671
1672	stream->state = SDW_STREAM_DEPREPARED;
1673	return do_bank_switch(stream);
1674}
1675
1676/**
1677 * sdw_deprepare_stream() - Deprepare SoundWire stream
1678 *
1679 * @stream: Soundwire stream
1680 *
1681 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1682 */
1683int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1684{
1685	int ret;
1686
1687	if (!stream) {
1688		pr_err("SoundWire: Handle not found for stream\n");
1689		return -EINVAL;
1690	}
1691
1692	sdw_acquire_bus_lock(stream);
1693
1694	if (stream->state == SDW_STREAM_DEPREPARED) {
1695		ret = 0;
1696		goto state_err;
1697	}
1698
1699	if (stream->state != SDW_STREAM_PREPARED &&
1700	    stream->state != SDW_STREAM_DISABLED) {
1701		pr_err("%s: %s: inconsistent state state %d\n",
1702		       __func__, stream->name, stream->state);
1703		ret = -EINVAL;
1704		goto state_err;
1705	}
1706
1707	ret = _sdw_deprepare_stream(stream);
1708
1709state_err:
1710	sdw_release_bus_lock(stream);
1711	return ret;
1712}
1713EXPORT_SYMBOL(sdw_deprepare_stream);
1714
1715static int set_stream(struct snd_pcm_substream *substream,
1716		      struct sdw_stream_runtime *sdw_stream)
1717{
1718	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1719	struct snd_soc_dai *dai;
1720	int ret = 0;
1721	int i;
1722
1723	/* Set stream pointer on all DAIs */
1724	for_each_rtd_dais(rtd, i, dai) {
1725		ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1726		if (ret < 0) {
1727			dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1728			break;
1729		}
1730	}
1731
1732	return ret;
1733}
1734
1735/**
1736 * sdw_alloc_stream() - Allocate and return stream runtime
1737 *
1738 * @stream_name: SoundWire stream name
1739 *
1740 * Allocates a SoundWire stream runtime instance.
1741 * sdw_alloc_stream should be called only once per stream. Typically
1742 * invoked from ALSA/ASoC machine/platform driver.
1743 */
1744struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
1745{
1746	struct sdw_stream_runtime *stream;
1747
1748	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
1749	if (!stream)
1750		return NULL;
1751
1752	stream->name = stream_name;
1753	INIT_LIST_HEAD(&stream->master_list);
1754	stream->state = SDW_STREAM_ALLOCATED;
1755	stream->m_rt_count = 0;
1756
1757	return stream;
1758}
1759EXPORT_SYMBOL(sdw_alloc_stream);
1760
1761/**
1762 * sdw_startup_stream() - Startup SoundWire stream
1763 *
1764 * @sdw_substream: Soundwire stream
1765 *
1766 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1767 */
1768int sdw_startup_stream(void *sdw_substream)
1769{
1770	struct snd_pcm_substream *substream = sdw_substream;
1771	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1772	struct sdw_stream_runtime *sdw_stream;
1773	char *name;
1774	int ret;
1775
1776	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1777		name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1778	else
1779		name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1780
1781	if (!name)
1782		return -ENOMEM;
1783
1784	sdw_stream = sdw_alloc_stream(name);
1785	if (!sdw_stream) {
1786		dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1787		ret = -ENOMEM;
1788		goto error;
1789	}
1790
1791	ret = set_stream(substream, sdw_stream);
1792	if (ret < 0)
1793		goto release_stream;
1794	return 0;
1795
1796release_stream:
1797	sdw_release_stream(sdw_stream);
1798	set_stream(substream, NULL);
1799error:
1800	kfree(name);
1801	return ret;
1802}
1803EXPORT_SYMBOL(sdw_startup_stream);
1804
1805/**
1806 * sdw_shutdown_stream() - Shutdown SoundWire stream
1807 *
1808 * @sdw_substream: Soundwire stream
1809 *
1810 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1811 */
1812void sdw_shutdown_stream(void *sdw_substream)
1813{
1814	struct snd_pcm_substream *substream = sdw_substream;
1815	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1816	struct sdw_stream_runtime *sdw_stream;
1817	struct snd_soc_dai *dai;
1818
1819	/* Find stream from first CPU DAI */
1820	dai = asoc_rtd_to_cpu(rtd, 0);
1821
1822	sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1823
1824	if (IS_ERR(sdw_stream)) {
1825		dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1826		return;
1827	}
1828
1829	/* release memory */
1830	kfree(sdw_stream->name);
1831	sdw_release_stream(sdw_stream);
1832
1833	/* clear DAI data */
1834	set_stream(substream, NULL);
1835}
1836EXPORT_SYMBOL(sdw_shutdown_stream);
1837
1838/**
1839 * sdw_release_stream() - Free the assigned stream runtime
1840 *
1841 * @stream: SoundWire stream runtime
1842 *
1843 * sdw_release_stream should be called only once per stream
1844 */
1845void sdw_release_stream(struct sdw_stream_runtime *stream)
1846{
1847	kfree(stream);
1848}
1849EXPORT_SYMBOL(sdw_release_stream);
1850
1851/**
1852 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1853 *
1854 * @bus: SDW Bus instance
1855 * @stream_config: Stream configuration for audio stream
1856 * @port_config: Port configuration for audio stream
1857 * @num_ports: Number of ports
1858 * @stream: SoundWire stream
1859 */
1860int sdw_stream_add_master(struct sdw_bus *bus,
1861			  struct sdw_stream_config *stream_config,
1862			  struct sdw_port_config *port_config,
1863			  unsigned int num_ports,
1864			  struct sdw_stream_runtime *stream)
1865{
1866	struct sdw_master_runtime *m_rt;
1867	bool alloc_master_rt = true;
1868	int ret;
1869
1870	mutex_lock(&bus->bus_lock);
1871
1872	/*
1873	 * For multi link streams, add the second master only if
1874	 * the bus supports it.
1875	 * Check if bus->multi_link is set
1876	 */
1877	if (!bus->multi_link && stream->m_rt_count > 0) {
1878		dev_err(bus->dev,
1879			"Multilink not supported, link %d\n", bus->link_id);
1880		ret = -EINVAL;
1881		goto unlock;
1882	}
1883
1884	/*
1885	 * check if Master is already allocated (e.g. as a result of Slave adding
1886	 * it first), if so skip allocation and go to configuration
1887	 */
1888	m_rt = sdw_master_rt_find(bus, stream);
1889	if (m_rt) {
1890		alloc_master_rt = false;
1891		goto skip_alloc_master_rt;
1892	}
1893
1894	m_rt = sdw_master_rt_alloc(bus, stream);
1895	if (!m_rt) {
1896		dev_err(bus->dev, "Master runtime alloc failed for stream:%s\n", stream->name);
1897		ret = -ENOMEM;
1898		goto unlock;
1899	}
1900skip_alloc_master_rt:
1901
1902	if (sdw_master_port_allocated(m_rt))
1903		goto skip_alloc_master_port;
1904
1905	ret = sdw_master_port_alloc(m_rt, num_ports);
1906	if (ret)
1907		goto alloc_error;
1908
1909	stream->m_rt_count++;
1910
1911skip_alloc_master_port:
1912
1913	ret = sdw_master_rt_config(m_rt, stream_config);
1914	if (ret < 0)
1915		goto unlock;
1916
1917	ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1918	if (ret)
1919		goto unlock;
1920
1921	ret = sdw_master_port_config(m_rt, port_config);
1922
1923	goto unlock;
1924
1925alloc_error:
1926	/*
1927	 * we only cleanup what was allocated in this routine
1928	 */
1929	if (alloc_master_rt)
1930		sdw_master_rt_free(m_rt, stream);
1931unlock:
1932	mutex_unlock(&bus->bus_lock);
1933	return ret;
1934}
1935EXPORT_SYMBOL(sdw_stream_add_master);
1936
1937/**
1938 * sdw_stream_remove_master() - Remove master from sdw_stream
1939 *
1940 * @bus: SDW Bus instance
1941 * @stream: SoundWire stream
1942 *
1943 * This removes and frees port_rt and master_rt from a stream
1944 */
1945int sdw_stream_remove_master(struct sdw_bus *bus,
1946			     struct sdw_stream_runtime *stream)
1947{
1948	struct sdw_master_runtime *m_rt, *_m_rt;
1949
1950	mutex_lock(&bus->bus_lock);
1951
1952	list_for_each_entry_safe(m_rt, _m_rt,
1953				 &stream->master_list, stream_node) {
1954		if (m_rt->bus != bus)
1955			continue;
1956
1957		sdw_master_port_free(m_rt);
1958		sdw_master_rt_free(m_rt, stream);
1959		stream->m_rt_count--;
1960	}
1961
1962	if (list_empty(&stream->master_list))
1963		stream->state = SDW_STREAM_RELEASED;
1964
1965	mutex_unlock(&bus->bus_lock);
1966
1967	return 0;
1968}
1969EXPORT_SYMBOL(sdw_stream_remove_master);
1970
1971/**
1972 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1973 *
1974 * @slave: SDW Slave instance
1975 * @stream_config: Stream configuration for audio stream
1976 * @stream: SoundWire stream
1977 * @port_config: Port configuration for audio stream
1978 * @num_ports: Number of ports
1979 *
1980 * It is expected that Slave is added before adding Master
1981 * to the Stream.
1982 *
1983 */
1984int sdw_stream_add_slave(struct sdw_slave *slave,
1985			 struct sdw_stream_config *stream_config,
1986			 struct sdw_port_config *port_config,
1987			 unsigned int num_ports,
1988			 struct sdw_stream_runtime *stream)
1989{
1990	struct sdw_slave_runtime *s_rt;
1991	struct sdw_master_runtime *m_rt;
1992	bool alloc_master_rt = true;
1993	bool alloc_slave_rt = true;
1994
1995	int ret;
1996
1997	mutex_lock(&slave->bus->bus_lock);
1998
1999	/*
2000	 * check if Master is already allocated, if so skip allocation
2001	 * and go to configuration
2002	 */
2003	m_rt = sdw_master_rt_find(slave->bus, stream);
2004	if (m_rt) {
2005		alloc_master_rt = false;
2006		goto skip_alloc_master_rt;
2007	}
2008
2009	/*
2010	 * If this API is invoked by Slave first then m_rt is not valid.
2011	 * So, allocate m_rt and add Slave to it.
2012	 */
2013	m_rt = sdw_master_rt_alloc(slave->bus, stream);
2014	if (!m_rt) {
2015		dev_err(&slave->dev, "Master runtime alloc failed for stream:%s\n", stream->name);
2016		ret = -ENOMEM;
2017		goto unlock;
2018	}
2019
2020skip_alloc_master_rt:
2021	s_rt = sdw_slave_rt_find(slave, stream);
2022	if (s_rt)
2023		goto skip_alloc_slave_rt;
2024
2025	s_rt = sdw_slave_rt_alloc(slave, m_rt);
2026	if (!s_rt) {
2027		dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n", stream->name);
2028		alloc_slave_rt = false;
2029		ret = -ENOMEM;
2030		goto alloc_error;
2031	}
2032
2033skip_alloc_slave_rt:
2034	if (sdw_slave_port_allocated(s_rt))
2035		goto skip_port_alloc;
2036
2037	ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
2038	if (ret)
2039		goto alloc_error;
2040
2041skip_port_alloc:
2042	ret =  sdw_master_rt_config(m_rt, stream_config);
2043	if (ret)
2044		goto unlock;
2045
2046	ret = sdw_slave_rt_config(s_rt, stream_config);
2047	if (ret)
2048		goto unlock;
2049
2050	ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
2051	if (ret)
2052		goto unlock;
2053
2054	ret = sdw_slave_port_config(slave, s_rt, port_config);
2055	if (ret)
2056		goto unlock;
2057
2058	/*
2059	 * Change stream state to CONFIGURED on first Slave add.
2060	 * Bus is not aware of number of Slave(s) in a stream at this
2061	 * point so cannot depend on all Slave(s) to be added in order to
2062	 * change stream state to CONFIGURED.
2063	 */
2064	stream->state = SDW_STREAM_CONFIGURED;
2065	goto unlock;
2066
2067alloc_error:
2068	/*
2069	 * we only cleanup what was allocated in this routine. The 'else if'
2070	 * is intentional, the 'master_rt_free' will call sdw_slave_rt_free()
2071	 * internally.
2072	 */
2073	if (alloc_master_rt)
2074		sdw_master_rt_free(m_rt, stream);
2075	else if (alloc_slave_rt)
2076		sdw_slave_rt_free(slave, stream);
2077unlock:
2078	mutex_unlock(&slave->bus->bus_lock);
2079	return ret;
2080}
2081EXPORT_SYMBOL(sdw_stream_add_slave);
2082
2083/**
2084 * sdw_stream_remove_slave() - Remove slave from sdw_stream
2085 *
2086 * @slave: SDW Slave instance
2087 * @stream: SoundWire stream
2088 *
2089 * This removes and frees port_rt and slave_rt from a stream
2090 */
2091int sdw_stream_remove_slave(struct sdw_slave *slave,
2092			    struct sdw_stream_runtime *stream)
2093{
2094	mutex_lock(&slave->bus->bus_lock);
2095
2096	sdw_slave_port_free(slave, stream);
2097	sdw_slave_rt_free(slave, stream);
2098
2099	mutex_unlock(&slave->bus->bus_lock);
2100
2101	return 0;
2102}
2103EXPORT_SYMBOL(sdw_stream_remove_slave);