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 <linux/string_choices.h>
18 #include <sound/soc.h>
19 #include "bus.h"
20
21 /*
22 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
23 *
24 * The rows are arranged as per the array index value programmed
25 * in register. The index 15 has dummy value 0 in order to fill hole.
26 */
27 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
28 96, 100, 120, 128, 150, 160, 250, 0,
29 192, 200, 240, 256, 72, 144, 90, 180};
30 EXPORT_SYMBOL(sdw_rows);
31
32 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
33 EXPORT_SYMBOL(sdw_cols);
34
sdw_find_col_index(int col)35 int sdw_find_col_index(int col)
36 {
37 int i;
38
39 for (i = 0; i < SDW_FRAME_COLS; i++) {
40 if (sdw_cols[i] == col)
41 return i;
42 }
43
44 pr_warn("Requested column not found, selecting lowest column no: 2\n");
45 return 0;
46 }
47 EXPORT_SYMBOL(sdw_find_col_index);
48
sdw_find_row_index(int row)49 int sdw_find_row_index(int row)
50 {
51 int i;
52
53 for (i = 0; i < SDW_FRAME_ROWS; i++) {
54 if (sdw_rows[i] == row)
55 return i;
56 }
57
58 pr_warn("Requested row not found, selecting lowest row no: 48\n");
59 return 0;
60 }
61 EXPORT_SYMBOL(sdw_find_row_index);
62
_sdw_program_slave_port_params(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_transport_params * t_params,enum sdw_dpn_type type)63 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
64 struct sdw_slave *slave,
65 struct sdw_transport_params *t_params,
66 enum sdw_dpn_type type)
67 {
68 u32 addr1, addr2, addr3, addr4;
69 int ret;
70 u16 wbuf;
71
72 if (bus->params.next_bank) {
73 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
74 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
75 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
76 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
77 } else {
78 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
79 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
80 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
81 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
82 }
83
84 /* Program DPN_OffsetCtrl2 registers */
85 ret = sdw_write_no_pm(slave, addr1, t_params->offset2);
86 if (ret < 0) {
87 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
88 return ret;
89 }
90
91 /* DP0 does not implement BlockCtrl3 */
92 if (t_params->port_num) {
93 /* Program DPN_BlockCtrl3 register */
94 ret = sdw_write_no_pm(slave, addr2, t_params->blk_pkg_mode);
95 if (ret < 0) {
96 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
97 return ret;
98 }
99 }
100
101 /*
102 * Data ports are FULL, SIMPLE and REDUCED. This function handles
103 * FULL and REDUCED only and beyond this point only FULL is
104 * handled, so bail out if we are not FULL data port type
105 */
106 if (type != SDW_DPN_FULL)
107 return ret;
108
109 /* Program DPN_SampleCtrl2 register */
110 wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
111
112 ret = sdw_write_no_pm(slave, addr3, wbuf);
113 if (ret < 0) {
114 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
115 return ret;
116 }
117
118 /* Program DPN_HCtrl register */
119 wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
120 wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
121
122 ret = sdw_write_no_pm(slave, addr4, wbuf);
123 if (ret < 0)
124 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
125
126 return ret;
127 }
128
sdw_program_slave_port_params(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt)129 static int sdw_program_slave_port_params(struct sdw_bus *bus,
130 struct sdw_slave_runtime *s_rt,
131 struct sdw_port_runtime *p_rt)
132 {
133 struct sdw_transport_params *t_params = &p_rt->transport_params;
134 struct sdw_port_params *p_params = &p_rt->port_params;
135 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
136 u32 addr1, addr2, addr3, addr4, addr5, addr6;
137 enum sdw_dpn_type port_type;
138 bool read_only_wordlength;
139 int ret;
140 u8 wbuf;
141
142 if (s_rt->slave->is_mockup_device)
143 return 0;
144
145 if (t_params->port_num) {
146 struct sdw_dpn_prop *dpn_prop;
147
148 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, s_rt->direction,
149 t_params->port_num);
150 if (!dpn_prop)
151 return -EINVAL;
152
153 read_only_wordlength = dpn_prop->read_only_wordlength;
154 port_type = dpn_prop->type;
155 } else {
156 read_only_wordlength = false;
157 port_type = SDW_DPN_FULL;
158 }
159
160 addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
161 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
162
163 if (bus->params.next_bank) {
164 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
165 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
166 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
167 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
168
169 } else {
170 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
171 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
172 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
173 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
174 }
175
176 /* Program DPN_PortCtrl register */
177 wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
178 wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
179
180 ret = sdw_update_no_pm(s_rt->slave, addr1, 0xF, wbuf);
181 if (ret < 0) {
182 dev_err(&s_rt->slave->dev,
183 "DPN_PortCtrl register write failed for port %d\n",
184 t_params->port_num);
185 return ret;
186 }
187
188 if (!read_only_wordlength) {
189 /* Program DPN_BlockCtrl1 register */
190 ret = sdw_write_no_pm(s_rt->slave, addr2, (p_params->bps - 1));
191 if (ret < 0) {
192 dev_err(&s_rt->slave->dev,
193 "DPN_BlockCtrl1 register write failed for port %d\n",
194 t_params->port_num);
195 return ret;
196 }
197 }
198
199 /* Program DPN_SampleCtrl1 register */
200 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
201 ret = sdw_write_no_pm(s_rt->slave, addr3, wbuf);
202 if (ret < 0) {
203 dev_err(&s_rt->slave->dev,
204 "DPN_SampleCtrl1 register write failed for port %d\n",
205 t_params->port_num);
206 return ret;
207 }
208
209 /* Program DPN_OffsetCtrl1 registers */
210 ret = sdw_write_no_pm(s_rt->slave, addr4, t_params->offset1);
211 if (ret < 0) {
212 dev_err(&s_rt->slave->dev,
213 "DPN_OffsetCtrl1 register write failed for port %d\n",
214 t_params->port_num);
215 return ret;
216 }
217
218 /* Program DPN_BlockCtrl2 register*/
219 if (t_params->blk_grp_ctrl_valid) {
220 ret = sdw_write_no_pm(s_rt->slave, addr5, t_params->blk_grp_ctrl);
221 if (ret < 0) {
222 dev_err(&s_rt->slave->dev,
223 "DPN_BlockCtrl2 reg write failed for port %d\n",
224 t_params->port_num);
225 return ret;
226 }
227 }
228
229 /* program DPN_LaneCtrl register */
230 if (slave_prop->lane_control_support) {
231 ret = sdw_write_no_pm(s_rt->slave, addr6, t_params->lane_ctrl);
232 if (ret < 0) {
233 dev_err(&s_rt->slave->dev,
234 "DPN_LaneCtrl register write failed for port %d\n",
235 t_params->port_num);
236 return ret;
237 }
238 }
239
240 if (port_type != SDW_DPN_SIMPLE) {
241 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
242 t_params, port_type);
243 if (ret < 0)
244 dev_err(&s_rt->slave->dev,
245 "Transport reg write failed for port: %d\n",
246 t_params->port_num);
247 }
248
249 return ret;
250 }
251
sdw_program_master_port_params(struct sdw_bus * bus,struct sdw_port_runtime * p_rt)252 static int sdw_program_master_port_params(struct sdw_bus *bus,
253 struct sdw_port_runtime *p_rt)
254 {
255 int ret;
256
257 /*
258 * we need to set transport and port parameters for the port.
259 * Transport parameters refers to the sample interval, offsets and
260 * hstart/stop etc of the data. Port parameters refers to word
261 * length, flow mode etc of the port
262 */
263 ret = bus->port_ops->dpn_set_port_transport_params(bus,
264 &p_rt->transport_params,
265 bus->params.next_bank);
266 if (ret < 0)
267 return ret;
268
269 return bus->port_ops->dpn_set_port_params(bus,
270 &p_rt->port_params,
271 bus->params.next_bank);
272 }
273
274 /**
275 * sdw_program_port_params() - Programs transport parameters of Master(s)
276 * and Slave(s)
277 *
278 * @m_rt: Master stream runtime
279 */
sdw_program_port_params(struct sdw_master_runtime * m_rt)280 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
281 {
282 struct sdw_slave_runtime *s_rt;
283 struct sdw_bus *bus = m_rt->bus;
284 struct sdw_port_runtime *p_rt;
285 int ret = 0;
286
287 /* Program transport & port parameters for Slave(s) */
288 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
289 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
290 ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
291 if (ret < 0)
292 return ret;
293 }
294 }
295
296 /* Program transport & port parameters for Master(s) */
297 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
298 ret = sdw_program_master_port_params(bus, p_rt);
299 if (ret < 0)
300 return ret;
301 }
302
303 return 0;
304 }
305
306 /**
307 * sdw_enable_disable_slave_ports: Enable/disable slave data port
308 *
309 * @bus: bus instance
310 * @s_rt: slave runtime
311 * @p_rt: port runtime
312 * @en: enable or disable operation
313 *
314 * This function only sets the enable/disable bits in the relevant bank, the
315 * actual enable/disable is done with a bank switch
316 */
sdw_enable_disable_slave_ports(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt,bool en)317 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
318 struct sdw_slave_runtime *s_rt,
319 struct sdw_port_runtime *p_rt,
320 bool en)
321 {
322 struct sdw_transport_params *t_params = &p_rt->transport_params;
323 u32 addr;
324 int ret;
325
326 if (bus->params.next_bank)
327 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
328 else
329 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
330
331 /*
332 * Since bus doesn't support sharing a port across two streams,
333 * it is safe to reset this register
334 */
335 if (en)
336 ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
337 else
338 ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
339
340 if (ret < 0)
341 dev_err(&s_rt->slave->dev,
342 "Slave chn_en reg write failed:%d port:%d\n",
343 ret, t_params->port_num);
344
345 return ret;
346 }
347
sdw_enable_disable_master_ports(struct sdw_master_runtime * m_rt,struct sdw_port_runtime * p_rt,bool en)348 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
349 struct sdw_port_runtime *p_rt,
350 bool en)
351 {
352 struct sdw_transport_params *t_params = &p_rt->transport_params;
353 struct sdw_bus *bus = m_rt->bus;
354 struct sdw_enable_ch enable_ch;
355 int ret;
356
357 enable_ch.port_num = p_rt->num;
358 enable_ch.ch_mask = p_rt->ch_mask;
359 enable_ch.enable = en;
360
361 /* Perform Master port channel(s) enable/disable */
362 if (bus->port_ops->dpn_port_enable_ch) {
363 ret = bus->port_ops->dpn_port_enable_ch(bus,
364 &enable_ch,
365 bus->params.next_bank);
366 if (ret < 0) {
367 dev_err(bus->dev,
368 "Master chn_en write failed:%d port:%d\n",
369 ret, t_params->port_num);
370 return ret;
371 }
372 } else {
373 dev_err(bus->dev,
374 "dpn_port_enable_ch not supported, %s failed\n",
375 str_enable_disable(en));
376 return -EINVAL;
377 }
378
379 return 0;
380 }
381
382 /**
383 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
384 * Slave(s)
385 *
386 * @m_rt: Master stream runtime
387 * @en: mode (enable/disable)
388 */
sdw_enable_disable_ports(struct sdw_master_runtime * m_rt,bool en)389 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
390 {
391 struct sdw_port_runtime *s_port, *m_port;
392 struct sdw_slave_runtime *s_rt;
393 int ret = 0;
394
395 /* Enable/Disable Slave port(s) */
396 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
397 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
398 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
399 s_port, en);
400 if (ret < 0)
401 return ret;
402 }
403 }
404
405 /* Enable/Disable Master port(s) */
406 list_for_each_entry(m_port, &m_rt->port_list, port_node) {
407 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
408 if (ret < 0)
409 return ret;
410 }
411
412 return 0;
413 }
414
sdw_do_port_prep(struct sdw_slave_runtime * s_rt,struct sdw_prepare_ch prep_ch,enum sdw_port_prep_ops cmd)415 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
416 struct sdw_prepare_ch prep_ch,
417 enum sdw_port_prep_ops cmd)
418 {
419 int ret = 0;
420 struct sdw_slave *slave = s_rt->slave;
421
422 mutex_lock(&slave->sdw_dev_lock);
423
424 if (slave->probed) {
425 struct device *dev = &slave->dev;
426 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
427
428 if (drv->ops && drv->ops->port_prep) {
429 ret = drv->ops->port_prep(slave, &prep_ch, cmd);
430 if (ret < 0)
431 dev_err(dev, "Slave Port Prep cmd %d failed: %d\n",
432 cmd, ret);
433 }
434 }
435
436 mutex_unlock(&slave->sdw_dev_lock);
437
438 return ret;
439 }
440
sdw_prep_deprep_slave_ports(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt,bool prep)441 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
442 struct sdw_slave_runtime *s_rt,
443 struct sdw_port_runtime *p_rt,
444 bool prep)
445 {
446 struct completion *port_ready;
447 struct sdw_dpn_prop *dpn_prop;
448 struct sdw_prepare_ch prep_ch;
449 u32 imp_def_interrupts;
450 bool simple_ch_prep_sm;
451 u32 ch_prep_timeout;
452 bool intr = false;
453 int ret = 0, val;
454 u32 addr;
455
456 prep_ch.num = p_rt->num;
457 prep_ch.ch_mask = p_rt->ch_mask;
458
459 if (p_rt->num) {
460 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, s_rt->direction, prep_ch.num);
461 if (!dpn_prop) {
462 dev_err(bus->dev,
463 "Slave Port:%d properties not found\n", prep_ch.num);
464 return -EINVAL;
465 }
466
467 imp_def_interrupts = dpn_prop->imp_def_interrupts;
468 simple_ch_prep_sm = dpn_prop->simple_ch_prep_sm;
469 ch_prep_timeout = dpn_prop->ch_prep_timeout;
470 } else {
471 struct sdw_dp0_prop *dp0_prop = s_rt->slave->prop.dp0_prop;
472
473 if (!dp0_prop) {
474 dev_err(bus->dev,
475 "Slave DP0 properties not found\n");
476 return -EINVAL;
477 }
478 imp_def_interrupts = dp0_prop->imp_def_interrupts;
479 simple_ch_prep_sm = dp0_prop->simple_ch_prep_sm;
480 ch_prep_timeout = dp0_prop->ch_prep_timeout;
481 }
482
483 prep_ch.prepare = prep;
484
485 prep_ch.bank = bus->params.next_bank;
486
487 if (imp_def_interrupts || !simple_ch_prep_sm ||
488 bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
489 intr = true;
490
491 /*
492 * Enable interrupt before Port prepare.
493 * For Port de-prepare, it is assumed that port
494 * was prepared earlier
495 */
496 if (prep && intr) {
497 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
498 imp_def_interrupts);
499 if (ret < 0)
500 return ret;
501 }
502
503 /* Inform slave about the impending port prepare */
504 sdw_do_port_prep(s_rt, prep_ch, prep ? SDW_OPS_PORT_PRE_PREP : SDW_OPS_PORT_PRE_DEPREP);
505
506 /* Prepare Slave port implementing CP_SM */
507 if (!simple_ch_prep_sm) {
508 addr = SDW_DPN_PREPARECTRL(p_rt->num);
509
510 if (prep)
511 ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
512 else
513 ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
514
515 if (ret < 0) {
516 dev_err(&s_rt->slave->dev,
517 "Slave prep_ctrl reg write failed\n");
518 return ret;
519 }
520
521 /* Wait for completion on port ready */
522 port_ready = &s_rt->slave->port_ready[prep_ch.num];
523 wait_for_completion_timeout(port_ready,
524 msecs_to_jiffies(ch_prep_timeout));
525
526 val = sdw_read_no_pm(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
527 if ((val < 0) || (val & p_rt->ch_mask)) {
528 ret = (val < 0) ? val : -ETIMEDOUT;
529 dev_err(&s_rt->slave->dev,
530 "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
531 return ret;
532 }
533 }
534
535 /* Inform slaves about ports prepared */
536 sdw_do_port_prep(s_rt, prep_ch, prep ? SDW_OPS_PORT_POST_PREP : SDW_OPS_PORT_POST_DEPREP);
537
538 /* Disable interrupt after Port de-prepare */
539 if (!prep && intr)
540 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
541 imp_def_interrupts);
542
543 return ret;
544 }
545
sdw_prep_deprep_master_ports(struct sdw_master_runtime * m_rt,struct sdw_port_runtime * p_rt,bool prep)546 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
547 struct sdw_port_runtime *p_rt,
548 bool prep)
549 {
550 struct sdw_transport_params *t_params = &p_rt->transport_params;
551 struct sdw_bus *bus = m_rt->bus;
552 const struct sdw_master_port_ops *ops = bus->port_ops;
553 struct sdw_prepare_ch prep_ch;
554 int ret = 0;
555
556 prep_ch.num = p_rt->num;
557 prep_ch.ch_mask = p_rt->ch_mask;
558 prep_ch.prepare = prep; /* Prepare/De-prepare */
559 prep_ch.bank = bus->params.next_bank;
560
561 /* Pre-prepare/Pre-deprepare port(s) */
562 if (ops->dpn_port_prep) {
563 ret = ops->dpn_port_prep(bus, &prep_ch);
564 if (ret < 0) {
565 dev_err(bus->dev, "Port prepare failed for port:%d\n",
566 t_params->port_num);
567 return ret;
568 }
569 }
570
571 return ret;
572 }
573
574 /**
575 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
576 * Slave(s)
577 *
578 * @m_rt: Master runtime handle
579 * @prep: Prepare or De-prepare
580 */
sdw_prep_deprep_ports(struct sdw_master_runtime * m_rt,bool prep)581 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
582 {
583 struct sdw_slave_runtime *s_rt;
584 struct sdw_port_runtime *p_rt;
585 int ret = 0;
586
587 /* Prepare/De-prepare Slave port(s) */
588 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
589 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
590 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
591 p_rt, prep);
592 if (ret < 0)
593 return ret;
594 }
595 }
596
597 /* Prepare/De-prepare Master port(s) */
598 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
599 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
600 if (ret < 0)
601 return ret;
602 }
603
604 return ret;
605 }
606
607 /**
608 * sdw_notify_config() - Notify bus configuration
609 *
610 * @m_rt: Master runtime handle
611 *
612 * This function notifies the Master(s) and Slave(s) of the
613 * new bus configuration.
614 */
sdw_notify_config(struct sdw_master_runtime * m_rt)615 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
616 {
617 struct sdw_slave_runtime *s_rt;
618 struct sdw_bus *bus = m_rt->bus;
619 struct sdw_slave *slave;
620 int ret;
621
622 if (bus->ops->set_bus_conf) {
623 ret = bus->ops->set_bus_conf(bus, &bus->params);
624 if (ret < 0)
625 return ret;
626 }
627
628 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
629 slave = s_rt->slave;
630
631 mutex_lock(&slave->sdw_dev_lock);
632
633 if (slave->probed) {
634 struct device *dev = &slave->dev;
635 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
636
637 if (drv->ops && drv->ops->bus_config) {
638 ret = drv->ops->bus_config(slave, &bus->params);
639 if (ret < 0) {
640 dev_err(dev, "Notify Slave: %d failed\n",
641 slave->dev_num);
642 mutex_unlock(&slave->sdw_dev_lock);
643 return ret;
644 }
645 }
646 }
647
648 mutex_unlock(&slave->sdw_dev_lock);
649 }
650
651 return 0;
652 }
653
654 /**
655 * sdw_program_params() - Program transport and port parameters for Master(s)
656 * and Slave(s)
657 *
658 * @bus: SDW bus instance
659 * @prepare: true if sdw_program_params() is called by _prepare.
660 */
sdw_program_params(struct sdw_bus * bus,bool prepare)661 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
662 {
663 struct sdw_master_runtime *m_rt;
664 struct sdw_slave *slave;
665 int ret = 0;
666 u32 addr1;
667
668 /* Check if all Peripherals comply with SDCA */
669 list_for_each_entry(slave, &bus->slaves, node) {
670 if (!slave->dev_num_sticky)
671 continue;
672 if (!is_clock_scaling_supported_by_slave(slave)) {
673 dev_dbg(&slave->dev, "The Peripheral doesn't comply with SDCA\n");
674 goto manager_runtime;
675 }
676 }
677
678 if (bus->params.next_bank)
679 addr1 = SDW_SCP_BUSCLOCK_SCALE_B1;
680 else
681 addr1 = SDW_SCP_BUSCLOCK_SCALE_B0;
682
683 /* Program SDW_SCP_BUSCLOCK_SCALE if all Peripherals comply with SDCA */
684 list_for_each_entry(slave, &bus->slaves, node) {
685 int scale_index;
686 u8 base;
687
688 if (!slave->dev_num_sticky)
689 continue;
690 scale_index = sdw_slave_get_scale_index(slave, &base);
691 if (scale_index < 0)
692 return scale_index;
693
694 ret = sdw_write_no_pm(slave, addr1, scale_index);
695 if (ret < 0) {
696 dev_err(&slave->dev, "SDW_SCP_BUSCLOCK_SCALE register write failed\n");
697 return ret;
698 }
699 }
700
701 manager_runtime:
702 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
703
704 /*
705 * this loop walks through all master runtimes for a
706 * bus, but the ports can only be configured while
707 * explicitly preparing a stream or handling an
708 * already-prepared stream otherwise.
709 */
710 if (!prepare &&
711 m_rt->stream->state == SDW_STREAM_CONFIGURED)
712 continue;
713
714 ret = sdw_program_port_params(m_rt);
715 if (ret < 0) {
716 dev_err(bus->dev,
717 "Program transport params failed: %d\n", ret);
718 return ret;
719 }
720
721 ret = sdw_notify_config(m_rt);
722 if (ret < 0) {
723 dev_err(bus->dev,
724 "Notify bus config failed: %d\n", ret);
725 return ret;
726 }
727
728 /* Enable port(s) on alternate bank for all active streams */
729 if (m_rt->stream->state != SDW_STREAM_ENABLED)
730 continue;
731
732 ret = sdw_enable_disable_ports(m_rt, true);
733 if (ret < 0) {
734 dev_err(bus->dev, "Enable channel failed: %d\n", ret);
735 return ret;
736 }
737 }
738
739 return ret;
740 }
741
sdw_bank_switch(struct sdw_bus * bus,int m_rt_count)742 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
743 {
744 int col_index, row_index;
745 bool multi_link;
746 struct sdw_msg *wr_msg;
747 u8 *wbuf;
748 int ret;
749 u16 addr;
750
751 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
752 if (!wr_msg)
753 return -ENOMEM;
754
755 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
756 if (!wbuf) {
757 ret = -ENOMEM;
758 goto error_1;
759 }
760
761 /* Get row and column index to program register */
762 col_index = sdw_find_col_index(bus->params.col);
763 row_index = sdw_find_row_index(bus->params.row);
764 wbuf[0] = col_index | (row_index << 3);
765
766 if (bus->params.next_bank)
767 addr = SDW_SCP_FRAMECTRL_B1;
768 else
769 addr = SDW_SCP_FRAMECTRL_B0;
770
771 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
772 SDW_MSG_FLAG_WRITE, wbuf);
773 wr_msg->ssp_sync = true;
774
775 /*
776 * Set the multi_link flag only when both the hardware supports
777 * and hardware-based sync is required
778 */
779 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
780
781 if (multi_link)
782 ret = sdw_transfer_defer(bus, wr_msg);
783 else
784 ret = sdw_transfer(bus, wr_msg);
785
786 if (ret < 0 && ret != -ENODATA) {
787 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
788 goto error;
789 }
790
791 if (!multi_link) {
792 kfree(wbuf);
793 kfree(wr_msg);
794 bus->defer_msg.msg = NULL;
795 bus->params.curr_bank = !bus->params.curr_bank;
796 bus->params.next_bank = !bus->params.next_bank;
797 }
798
799 return 0;
800
801 error:
802 kfree(wbuf);
803 error_1:
804 kfree(wr_msg);
805 bus->defer_msg.msg = NULL;
806 return ret;
807 }
808
809 /**
810 * sdw_ml_sync_bank_switch: Multilink register bank switch
811 *
812 * @bus: SDW bus instance
813 * @multi_link: whether this is a multi-link stream with hardware-based sync
814 *
815 * Caller function should free the buffers on error
816 */
sdw_ml_sync_bank_switch(struct sdw_bus * bus,bool multi_link)817 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus, bool multi_link)
818 {
819 unsigned long time_left;
820
821 if (!multi_link)
822 return 0;
823
824 /* Wait for completion of transfer */
825 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
826 bus->bank_switch_timeout);
827
828 if (!time_left) {
829 dev_err(bus->dev, "Controller Timed out on bank switch\n");
830 return -ETIMEDOUT;
831 }
832
833 bus->params.curr_bank = !bus->params.curr_bank;
834 bus->params.next_bank = !bus->params.next_bank;
835
836 if (bus->defer_msg.msg) {
837 kfree(bus->defer_msg.msg->buf);
838 kfree(bus->defer_msg.msg);
839 bus->defer_msg.msg = NULL;
840 }
841
842 return 0;
843 }
844
do_bank_switch(struct sdw_stream_runtime * stream)845 static int do_bank_switch(struct sdw_stream_runtime *stream)
846 {
847 struct sdw_master_runtime *m_rt;
848 const struct sdw_master_ops *ops;
849 struct sdw_bus *bus;
850 bool multi_link = false;
851 int m_rt_count;
852 int ret = 0;
853
854 m_rt_count = stream->m_rt_count;
855
856 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
857 bus = m_rt->bus;
858 ops = bus->ops;
859
860 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
861 multi_link = true;
862 mutex_lock(&bus->msg_lock);
863 }
864
865 /* Pre-bank switch */
866 if (ops->pre_bank_switch) {
867 ret = ops->pre_bank_switch(bus);
868 if (ret < 0) {
869 dev_err(bus->dev,
870 "Pre bank switch op failed: %d\n", ret);
871 goto msg_unlock;
872 }
873 }
874
875 /*
876 * Perform Bank switch operation.
877 * For multi link cases, the actual bank switch is
878 * synchronized across all Masters and happens later as a
879 * part of post_bank_switch ops.
880 */
881 ret = sdw_bank_switch(bus, m_rt_count);
882 if (ret < 0) {
883 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
884 goto error;
885 }
886 }
887
888 /*
889 * For multi link cases, it is expected that the bank switch is
890 * triggered by the post_bank_switch for the first Master in the list
891 * and for the other Masters the post_bank_switch() should return doing
892 * nothing.
893 */
894 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
895 bus = m_rt->bus;
896 ops = bus->ops;
897
898 /* Post-bank switch */
899 if (ops->post_bank_switch) {
900 ret = ops->post_bank_switch(bus);
901 if (ret < 0) {
902 dev_err(bus->dev,
903 "Post bank switch op failed: %d\n",
904 ret);
905 goto error;
906 }
907 } else if (multi_link) {
908 dev_err(bus->dev,
909 "Post bank switch ops not implemented\n");
910 ret = -EINVAL;
911 goto error;
912 }
913
914 /* Set the bank switch timeout to default, if not set */
915 if (!bus->bank_switch_timeout)
916 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
917
918 /* Check if bank switch was successful */
919 ret = sdw_ml_sync_bank_switch(bus, multi_link);
920 if (ret < 0) {
921 dev_err(bus->dev,
922 "multi link bank switch failed: %d\n", ret);
923 goto error;
924 }
925
926 if (multi_link)
927 mutex_unlock(&bus->msg_lock);
928 }
929
930 return ret;
931
932 error:
933 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
934 bus = m_rt->bus;
935 if (bus->defer_msg.msg) {
936 kfree(bus->defer_msg.msg->buf);
937 kfree(bus->defer_msg.msg);
938 bus->defer_msg.msg = NULL;
939 }
940 }
941
942 msg_unlock:
943
944 if (multi_link) {
945 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
946 bus = m_rt->bus;
947 if (mutex_is_locked(&bus->msg_lock))
948 mutex_unlock(&bus->msg_lock);
949 }
950 }
951
952 return ret;
953 }
954
sdw_port_alloc(struct list_head * port_list)955 static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
956 {
957 struct sdw_port_runtime *p_rt;
958
959 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
960 if (!p_rt)
961 return NULL;
962
963 list_add_tail(&p_rt->port_node, port_list);
964
965 return p_rt;
966 }
967
sdw_port_config(struct sdw_port_runtime * p_rt,const struct sdw_port_config * port_config,int port_index)968 static int sdw_port_config(struct sdw_port_runtime *p_rt,
969 const struct sdw_port_config *port_config,
970 int port_index)
971 {
972 p_rt->ch_mask = port_config[port_index].ch_mask;
973 p_rt->num = port_config[port_index].num;
974
975 /*
976 * TODO: Check port capabilities for requested configuration
977 */
978
979 return 0;
980 }
981
sdw_port_free(struct sdw_port_runtime * p_rt)982 static void sdw_port_free(struct sdw_port_runtime *p_rt)
983 {
984 list_del(&p_rt->port_node);
985 kfree(p_rt);
986 }
987
sdw_slave_port_allocated(struct sdw_slave_runtime * s_rt)988 static bool sdw_slave_port_allocated(struct sdw_slave_runtime *s_rt)
989 {
990 return !list_empty(&s_rt->port_list);
991 }
992
sdw_slave_port_free(struct sdw_slave * slave,struct sdw_stream_runtime * stream)993 static void sdw_slave_port_free(struct sdw_slave *slave,
994 struct sdw_stream_runtime *stream)
995 {
996 struct sdw_port_runtime *p_rt, *_p_rt;
997 struct sdw_master_runtime *m_rt;
998 struct sdw_slave_runtime *s_rt;
999
1000 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1001 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1002 if (s_rt->slave != slave)
1003 continue;
1004
1005 list_for_each_entry_safe(p_rt, _p_rt,
1006 &s_rt->port_list, port_node) {
1007 sdw_port_free(p_rt);
1008 }
1009 }
1010 }
1011 }
1012
sdw_slave_port_alloc(struct sdw_slave * slave,struct sdw_slave_runtime * s_rt,unsigned int num_config)1013 static int sdw_slave_port_alloc(struct sdw_slave *slave,
1014 struct sdw_slave_runtime *s_rt,
1015 unsigned int num_config)
1016 {
1017 struct sdw_port_runtime *p_rt;
1018 int i;
1019
1020 /* Iterate for number of ports to perform initialization */
1021 for (i = 0; i < num_config; i++) {
1022 p_rt = sdw_port_alloc(&s_rt->port_list);
1023 if (!p_rt)
1024 return -ENOMEM;
1025 }
1026
1027 return 0;
1028 }
1029
sdw_slave_port_is_valid_range(struct device * dev,int num)1030 static int sdw_slave_port_is_valid_range(struct device *dev, int num)
1031 {
1032 if (!SDW_VALID_PORT_RANGE(num)) {
1033 dev_err(dev, "SoundWire: Invalid port number :%d\n", num);
1034 return -EINVAL;
1035 }
1036
1037 return 0;
1038 }
1039
sdw_slave_port_config(struct sdw_slave * slave,struct sdw_slave_runtime * s_rt,const struct sdw_port_config * port_config,bool is_bpt_stream)1040 static int sdw_slave_port_config(struct sdw_slave *slave,
1041 struct sdw_slave_runtime *s_rt,
1042 const struct sdw_port_config *port_config,
1043 bool is_bpt_stream)
1044 {
1045 struct sdw_port_runtime *p_rt;
1046 int ret;
1047 int i;
1048
1049 i = 0;
1050 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
1051 /*
1052 * TODO: Check valid port range as defined by DisCo/
1053 * slave
1054 */
1055 if (!is_bpt_stream) {
1056 ret = sdw_slave_port_is_valid_range(&slave->dev, port_config[i].num);
1057 if (ret < 0)
1058 return ret;
1059 } else if (port_config[i].num) {
1060 return -EINVAL;
1061 }
1062
1063 ret = sdw_port_config(p_rt, port_config, i);
1064 if (ret < 0)
1065 return ret;
1066 i++;
1067 }
1068
1069 return 0;
1070 }
1071
sdw_master_port_allocated(struct sdw_master_runtime * m_rt)1072 static bool sdw_master_port_allocated(struct sdw_master_runtime *m_rt)
1073 {
1074 return !list_empty(&m_rt->port_list);
1075 }
1076
sdw_master_port_free(struct sdw_master_runtime * m_rt)1077 static void sdw_master_port_free(struct sdw_master_runtime *m_rt)
1078 {
1079 struct sdw_port_runtime *p_rt, *_p_rt;
1080
1081 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1082 sdw_port_free(p_rt);
1083 }
1084 }
1085
sdw_master_port_alloc(struct sdw_master_runtime * m_rt,unsigned int num_ports)1086 static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
1087 unsigned int num_ports)
1088 {
1089 struct sdw_port_runtime *p_rt;
1090 int i;
1091
1092 /* Iterate for number of ports to perform initialization */
1093 for (i = 0; i < num_ports; i++) {
1094 p_rt = sdw_port_alloc(&m_rt->port_list);
1095 if (!p_rt)
1096 return -ENOMEM;
1097 }
1098
1099 return 0;
1100 }
1101
sdw_master_port_config(struct sdw_master_runtime * m_rt,const struct sdw_port_config * port_config)1102 static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
1103 const struct sdw_port_config *port_config)
1104 {
1105 struct sdw_port_runtime *p_rt;
1106 int ret;
1107 int i;
1108
1109 i = 0;
1110 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1111 ret = sdw_port_config(p_rt, port_config, i);
1112 if (ret < 0)
1113 return ret;
1114 i++;
1115 }
1116
1117 return 0;
1118 }
1119
1120 /**
1121 * sdw_slave_rt_alloc() - Allocate a Slave runtime handle.
1122 *
1123 * @slave: Slave handle
1124 * @m_rt: Master runtime handle
1125 *
1126 * This function is to be called with bus_lock held.
1127 */
1128 static struct sdw_slave_runtime
sdw_slave_rt_alloc(struct sdw_slave * slave,struct sdw_master_runtime * m_rt)1129 *sdw_slave_rt_alloc(struct sdw_slave *slave,
1130 struct sdw_master_runtime *m_rt)
1131 {
1132 struct sdw_slave_runtime *s_rt;
1133
1134 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1135 if (!s_rt)
1136 return NULL;
1137
1138 INIT_LIST_HEAD(&s_rt->port_list);
1139 s_rt->slave = slave;
1140
1141 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1142
1143 return s_rt;
1144 }
1145
1146 /**
1147 * sdw_slave_rt_config() - Configure a Slave runtime handle.
1148 *
1149 * @s_rt: Slave runtime handle
1150 * @stream_config: Stream configuration
1151 *
1152 * This function is to be called with bus_lock held.
1153 */
sdw_slave_rt_config(struct sdw_slave_runtime * s_rt,struct sdw_stream_config * stream_config)1154 static int sdw_slave_rt_config(struct sdw_slave_runtime *s_rt,
1155 struct sdw_stream_config *stream_config)
1156 {
1157 s_rt->ch_count = stream_config->ch_count;
1158 s_rt->direction = stream_config->direction;
1159
1160 return 0;
1161 }
1162
sdw_slave_rt_find(struct sdw_slave * slave,struct sdw_stream_runtime * stream)1163 static struct sdw_slave_runtime *sdw_slave_rt_find(struct sdw_slave *slave,
1164 struct sdw_stream_runtime *stream)
1165 {
1166 struct sdw_slave_runtime *s_rt, *_s_rt;
1167 struct sdw_master_runtime *m_rt;
1168
1169 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1170 /* Retrieve Slave runtime handle */
1171 list_for_each_entry_safe(s_rt, _s_rt,
1172 &m_rt->slave_rt_list, m_rt_node) {
1173 if (s_rt->slave == slave)
1174 return s_rt;
1175 }
1176 }
1177 return NULL;
1178 }
1179
1180 /**
1181 * sdw_slave_rt_free() - Free Slave(s) runtime handle
1182 *
1183 * @slave: Slave handle.
1184 * @stream: Stream runtime handle.
1185 *
1186 * This function is to be called with bus_lock held.
1187 */
sdw_slave_rt_free(struct sdw_slave * slave,struct sdw_stream_runtime * stream)1188 static void sdw_slave_rt_free(struct sdw_slave *slave,
1189 struct sdw_stream_runtime *stream)
1190 {
1191 struct sdw_slave_runtime *s_rt;
1192
1193 s_rt = sdw_slave_rt_find(slave, stream);
1194 if (s_rt) {
1195 list_del(&s_rt->m_rt_node);
1196 kfree(s_rt);
1197 }
1198 }
1199
1200 static struct sdw_master_runtime
sdw_master_rt_find(struct sdw_bus * bus,struct sdw_stream_runtime * stream)1201 *sdw_master_rt_find(struct sdw_bus *bus,
1202 struct sdw_stream_runtime *stream)
1203 {
1204 struct sdw_master_runtime *m_rt;
1205
1206 /* Retrieve Bus handle if already available */
1207 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1208 if (m_rt->bus == bus)
1209 return m_rt;
1210 }
1211
1212 return NULL;
1213 }
1214
1215 /**
1216 * sdw_master_rt_alloc() - Allocates a Master runtime handle
1217 *
1218 * @bus: SDW bus instance
1219 * @stream: Stream runtime handle.
1220 *
1221 * This function is to be called with bus_lock held.
1222 */
1223 static struct sdw_master_runtime
sdw_master_rt_alloc(struct sdw_bus * bus,struct sdw_stream_runtime * stream)1224 *sdw_master_rt_alloc(struct sdw_bus *bus,
1225 struct sdw_stream_runtime *stream)
1226 {
1227 struct sdw_master_runtime *m_rt, *walk_m_rt;
1228 struct list_head *insert_after;
1229
1230 if (stream->type == SDW_STREAM_BPT) {
1231 if (bus->stream_refcount > 0 || bus->bpt_stream_refcount > 0) {
1232 dev_err(bus->dev, "%s: %d/%d audio/BPT stream already allocated\n",
1233 __func__, bus->stream_refcount, bus->bpt_stream_refcount);
1234 return ERR_PTR(-EBUSY);
1235 }
1236 } else {
1237 if (bus->bpt_stream_refcount > 0) {
1238 dev_err(bus->dev, "%s: BPT stream already allocated\n",
1239 __func__);
1240 return ERR_PTR(-EAGAIN);
1241 }
1242 }
1243
1244 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
1245 if (!m_rt)
1246 return NULL;
1247
1248 /* Initialization of Master runtime handle */
1249 INIT_LIST_HEAD(&m_rt->port_list);
1250 INIT_LIST_HEAD(&m_rt->slave_rt_list);
1251
1252 /*
1253 * Add in order of bus id so that when taking the bus_lock
1254 * of multiple buses they will always be taken in the same
1255 * order to prevent a mutex deadlock.
1256 */
1257 insert_after = &stream->master_list;
1258 list_for_each_entry_reverse(walk_m_rt, &stream->master_list, stream_node) {
1259 if (walk_m_rt->bus->id < bus->id) {
1260 insert_after = &walk_m_rt->stream_node;
1261 break;
1262 }
1263 }
1264 list_add(&m_rt->stream_node, insert_after);
1265
1266 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
1267
1268 m_rt->bus = bus;
1269 m_rt->stream = stream;
1270
1271 bus->stream_refcount++;
1272 if (stream->type == SDW_STREAM_BPT)
1273 bus->bpt_stream_refcount++;
1274
1275 return m_rt;
1276 }
1277
1278 /**
1279 * sdw_master_rt_config() - Configure Master runtime handle
1280 *
1281 * @m_rt: Master runtime handle
1282 * @stream_config: Stream configuration
1283 *
1284 * This function is to be called with bus_lock held.
1285 */
1286
sdw_master_rt_config(struct sdw_master_runtime * m_rt,struct sdw_stream_config * stream_config)1287 static int sdw_master_rt_config(struct sdw_master_runtime *m_rt,
1288 struct sdw_stream_config *stream_config)
1289 {
1290 m_rt->ch_count = stream_config->ch_count;
1291 m_rt->direction = stream_config->direction;
1292
1293 return 0;
1294 }
1295
1296 /**
1297 * sdw_master_rt_free() - Free Master runtime handle
1298 *
1299 * @m_rt: Master runtime node
1300 * @stream: Stream runtime handle.
1301 *
1302 * This function is to be called with bus_lock held
1303 * It frees the Master runtime handle and associated Slave(s) runtime
1304 * handle. If this is called first then sdw_slave_rt_free() will have
1305 * no effect as Slave(s) runtime handle would already be freed up.
1306 */
sdw_master_rt_free(struct sdw_master_runtime * m_rt,struct sdw_stream_runtime * stream)1307 static void sdw_master_rt_free(struct sdw_master_runtime *m_rt,
1308 struct sdw_stream_runtime *stream)
1309 {
1310 struct sdw_slave_runtime *s_rt, *_s_rt;
1311 struct sdw_bus *bus = m_rt->bus;
1312
1313 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1314 sdw_slave_port_free(s_rt->slave, stream);
1315 sdw_slave_rt_free(s_rt->slave, stream);
1316 }
1317
1318 list_del(&m_rt->stream_node);
1319 list_del(&m_rt->bus_node);
1320 kfree(m_rt);
1321
1322 if (stream->type == SDW_STREAM_BPT)
1323 bus->bpt_stream_refcount--;
1324 bus->stream_refcount--;
1325 }
1326
1327 /**
1328 * sdw_config_stream() - Configure the allocated stream
1329 *
1330 * @dev: SDW device
1331 * @stream: SoundWire stream
1332 * @stream_config: Stream configuration for audio stream
1333 * @is_slave: is API called from Slave or Master
1334 *
1335 * This function is to be called with bus_lock held.
1336 */
sdw_config_stream(struct device * dev,struct sdw_stream_runtime * stream,struct sdw_stream_config * stream_config,bool is_slave)1337 static int sdw_config_stream(struct device *dev,
1338 struct sdw_stream_runtime *stream,
1339 struct sdw_stream_config *stream_config,
1340 bool is_slave)
1341 {
1342 /*
1343 * Update the stream rate, channel and bps based on data
1344 * source. For more than one data source (multilink),
1345 * match the rate, bps, stream type and increment number of channels.
1346 *
1347 * If rate/bps is zero, it means the values are not set, so skip
1348 * comparison and allow the value to be set and stored in stream
1349 */
1350 if (stream->params.rate &&
1351 stream->params.rate != stream_config->frame_rate) {
1352 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1353 return -EINVAL;
1354 }
1355
1356 if (stream->params.bps &&
1357 stream->params.bps != stream_config->bps) {
1358 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1359 return -EINVAL;
1360 }
1361
1362 stream->type = stream_config->type;
1363 stream->params.rate = stream_config->frame_rate;
1364 stream->params.bps = stream_config->bps;
1365
1366 /* TODO: Update this check during Device-device support */
1367 if (is_slave)
1368 stream->params.ch_count += stream_config->ch_count;
1369
1370 return 0;
1371 }
1372
1373 /**
1374 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1375 *
1376 * @slave: Slave handle
1377 * @direction: Data direction.
1378 * @port_num: Port number
1379 */
sdw_get_slave_dpn_prop(struct sdw_slave * slave,enum sdw_data_direction direction,unsigned int port_num)1380 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1381 enum sdw_data_direction direction,
1382 unsigned int port_num)
1383 {
1384 struct sdw_dpn_prop *dpn_prop;
1385 u8 num_ports;
1386 int i;
1387
1388 if (!port_num) {
1389 dev_err(&slave->dev, "%s: port_num is zero\n", __func__);
1390 return NULL;
1391 }
1392
1393 if (direction == SDW_DATA_DIR_TX) {
1394 num_ports = hweight32(slave->prop.source_ports);
1395 dpn_prop = slave->prop.src_dpn_prop;
1396 } else {
1397 num_ports = hweight32(slave->prop.sink_ports);
1398 dpn_prop = slave->prop.sink_dpn_prop;
1399 }
1400
1401 for (i = 0; i < num_ports; i++) {
1402 if (dpn_prop[i].num == port_num)
1403 return &dpn_prop[i];
1404 }
1405
1406 return NULL;
1407 }
1408
1409 /**
1410 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1411 *
1412 * @stream: SoundWire stream
1413 *
1414 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1415 * stream to reconfigure the bus.
1416 * NOTE: This function is called from SoundWire stream ops and is
1417 * expected that a global lock is held before acquiring bus_lock.
1418 */
sdw_acquire_bus_lock(struct sdw_stream_runtime * stream)1419 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1420 {
1421 struct sdw_master_runtime *m_rt;
1422 struct sdw_bus *bus;
1423
1424 /* Iterate for all Master(s) in Master list */
1425 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1426 bus = m_rt->bus;
1427
1428 mutex_lock(&bus->bus_lock);
1429 }
1430 }
1431
1432 /**
1433 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1434 *
1435 * @stream: SoundWire stream
1436 *
1437 * Release the previously held bus_lock after reconfiguring the bus.
1438 * NOTE: This function is called from SoundWire stream ops and is
1439 * expected that a global lock is held before releasing bus_lock.
1440 */
sdw_release_bus_lock(struct sdw_stream_runtime * stream)1441 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1442 {
1443 struct sdw_master_runtime *m_rt;
1444 struct sdw_bus *bus;
1445
1446 /* Iterate for all Master(s) in Master list */
1447 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1448 bus = m_rt->bus;
1449 mutex_unlock(&bus->bus_lock);
1450 }
1451 }
1452
_sdw_prepare_stream(struct sdw_stream_runtime * stream,bool update_params)1453 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1454 bool update_params)
1455 {
1456 struct sdw_master_runtime *m_rt;
1457 struct sdw_bus *bus;
1458 struct sdw_master_prop *prop;
1459 struct sdw_bus_params params;
1460 int ret;
1461
1462 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1463 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1464 bus = m_rt->bus;
1465 prop = &bus->prop;
1466 memcpy(¶ms, &bus->params, sizeof(params));
1467
1468 /* TODO: Support Asynchronous mode */
1469 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1470 dev_err(bus->dev, "Async mode not supported\n");
1471 return -EINVAL;
1472 }
1473
1474 if (update_params) {
1475 /* Increment cumulative bus bandwidth */
1476 /* TODO: Update this during Device-Device support */
1477 bus->params.bandwidth += m_rt->stream->params.rate *
1478 m_rt->ch_count * m_rt->stream->params.bps;
1479
1480 /* Compute params */
1481 if (bus->compute_params) {
1482 ret = bus->compute_params(bus, stream);
1483 if (ret < 0) {
1484 dev_err(bus->dev, "Compute params failed: %d\n",
1485 ret);
1486 goto restore_params;
1487 }
1488 }
1489 }
1490
1491 /* Program params */
1492 ret = sdw_program_params(bus, true);
1493 if (ret < 0) {
1494 dev_err(bus->dev, "Program params failed: %d\n", ret);
1495 goto restore_params;
1496 }
1497 }
1498
1499 ret = do_bank_switch(stream);
1500 if (ret < 0) {
1501 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1502 goto restore_params;
1503 }
1504
1505 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1506 bus = m_rt->bus;
1507
1508 /* Prepare port(s) on the new clock configuration */
1509 ret = sdw_prep_deprep_ports(m_rt, true);
1510 if (ret < 0) {
1511 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1512 ret);
1513 return ret;
1514 }
1515 }
1516
1517 stream->state = SDW_STREAM_PREPARED;
1518
1519 return ret;
1520
1521 restore_params:
1522 memcpy(&bus->params, ¶ms, sizeof(params));
1523 return ret;
1524 }
1525
1526 /**
1527 * sdw_prepare_stream() - Prepare SoundWire stream
1528 *
1529 * @stream: Soundwire stream
1530 *
1531 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1532 */
sdw_prepare_stream(struct sdw_stream_runtime * stream)1533 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1534 {
1535 bool update_params = true;
1536 int ret;
1537
1538 if (!stream) {
1539 pr_err("SoundWire: Handle not found for stream\n");
1540 return -EINVAL;
1541 }
1542
1543 sdw_acquire_bus_lock(stream);
1544
1545 if (stream->state == SDW_STREAM_PREPARED) {
1546 ret = 0;
1547 goto state_err;
1548 }
1549
1550 if (stream->state != SDW_STREAM_CONFIGURED &&
1551 stream->state != SDW_STREAM_DEPREPARED &&
1552 stream->state != SDW_STREAM_DISABLED) {
1553 pr_err("%s: %s: inconsistent state state %d\n",
1554 __func__, stream->name, stream->state);
1555 ret = -EINVAL;
1556 goto state_err;
1557 }
1558
1559 /*
1560 * when the stream is DISABLED, this means sdw_prepare_stream()
1561 * is called as a result of an underflow or a resume operation.
1562 * In this case, the bus parameters shall not be recomputed, but
1563 * still need to be re-applied
1564 */
1565 if (stream->state == SDW_STREAM_DISABLED)
1566 update_params = false;
1567
1568 ret = _sdw_prepare_stream(stream, update_params);
1569
1570 state_err:
1571 sdw_release_bus_lock(stream);
1572 return ret;
1573 }
1574 EXPORT_SYMBOL(sdw_prepare_stream);
1575
_sdw_enable_stream(struct sdw_stream_runtime * stream)1576 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1577 {
1578 struct sdw_master_runtime *m_rt;
1579 struct sdw_bus *bus;
1580 int ret;
1581
1582 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1583 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1584 bus = m_rt->bus;
1585
1586 /* Program params */
1587 ret = sdw_program_params(bus, false);
1588 if (ret < 0) {
1589 dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1590 return ret;
1591 }
1592
1593 /* Enable port(s) */
1594 ret = sdw_enable_disable_ports(m_rt, true);
1595 if (ret < 0) {
1596 dev_err(bus->dev,
1597 "Enable port(s) failed ret: %d\n", ret);
1598 return ret;
1599 }
1600 }
1601
1602 ret = do_bank_switch(stream);
1603 if (ret < 0) {
1604 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1605 return ret;
1606 }
1607
1608 stream->state = SDW_STREAM_ENABLED;
1609 return 0;
1610 }
1611
1612 /**
1613 * sdw_enable_stream() - Enable SoundWire stream
1614 *
1615 * @stream: Soundwire stream
1616 *
1617 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1618 */
sdw_enable_stream(struct sdw_stream_runtime * stream)1619 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1620 {
1621 int ret;
1622
1623 if (!stream) {
1624 pr_err("SoundWire: Handle not found for stream\n");
1625 return -EINVAL;
1626 }
1627
1628 sdw_acquire_bus_lock(stream);
1629
1630 if (stream->state == SDW_STREAM_ENABLED) {
1631 ret = 0;
1632 goto state_err;
1633 }
1634
1635 if (stream->state != SDW_STREAM_PREPARED &&
1636 stream->state != SDW_STREAM_DISABLED) {
1637 pr_err("%s: %s: inconsistent state state %d\n",
1638 __func__, stream->name, stream->state);
1639 ret = -EINVAL;
1640 goto state_err;
1641 }
1642
1643 ret = _sdw_enable_stream(stream);
1644
1645 state_err:
1646 sdw_release_bus_lock(stream);
1647 return ret;
1648 }
1649 EXPORT_SYMBOL(sdw_enable_stream);
1650
_sdw_disable_stream(struct sdw_stream_runtime * stream)1651 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1652 {
1653 struct sdw_master_runtime *m_rt;
1654 int ret;
1655
1656 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1657 struct sdw_bus *bus = m_rt->bus;
1658
1659 /* Disable port(s) */
1660 ret = sdw_enable_disable_ports(m_rt, false);
1661 if (ret < 0) {
1662 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1663 return ret;
1664 }
1665 }
1666 stream->state = SDW_STREAM_DISABLED;
1667
1668 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1669 struct sdw_bus *bus = m_rt->bus;
1670
1671 /* Program params */
1672 ret = sdw_program_params(bus, false);
1673 if (ret < 0) {
1674 dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1675 return ret;
1676 }
1677 }
1678
1679 ret = do_bank_switch(stream);
1680 if (ret < 0) {
1681 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1682 return ret;
1683 }
1684
1685 /* make sure alternate bank (previous current) is also disabled */
1686 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1687 struct sdw_bus *bus = m_rt->bus;
1688
1689 /* Disable port(s) */
1690 ret = sdw_enable_disable_ports(m_rt, false);
1691 if (ret < 0) {
1692 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1693 return ret;
1694 }
1695 }
1696
1697 return 0;
1698 }
1699
1700 /**
1701 * sdw_disable_stream() - Disable SoundWire stream
1702 *
1703 * @stream: Soundwire stream
1704 *
1705 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1706 */
sdw_disable_stream(struct sdw_stream_runtime * stream)1707 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1708 {
1709 int ret;
1710
1711 if (!stream) {
1712 pr_err("SoundWire: Handle not found for stream\n");
1713 return -EINVAL;
1714 }
1715
1716 sdw_acquire_bus_lock(stream);
1717
1718 if (stream->state == SDW_STREAM_DISABLED) {
1719 ret = 0;
1720 goto state_err;
1721 }
1722
1723 if (stream->state != SDW_STREAM_ENABLED) {
1724 pr_err("%s: %s: inconsistent state state %d\n",
1725 __func__, stream->name, stream->state);
1726 ret = -EINVAL;
1727 goto state_err;
1728 }
1729
1730 ret = _sdw_disable_stream(stream);
1731
1732 state_err:
1733 sdw_release_bus_lock(stream);
1734 return ret;
1735 }
1736 EXPORT_SYMBOL(sdw_disable_stream);
1737
_sdw_deprepare_stream(struct sdw_stream_runtime * stream)1738 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1739 {
1740 struct sdw_master_runtime *m_rt;
1741 struct sdw_port_runtime *p_rt;
1742 unsigned int multi_lane_bandwidth;
1743 unsigned int bandwidth;
1744 struct sdw_bus *bus;
1745 int state = stream->state;
1746 int ret = 0;
1747
1748 /*
1749 * first mark the state as DEPREPARED so that it is not taken into account
1750 * for bit allocation
1751 */
1752 stream->state = SDW_STREAM_DEPREPARED;
1753
1754 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1755 bus = m_rt->bus;
1756 /* De-prepare port(s) */
1757 ret = sdw_prep_deprep_ports(m_rt, false);
1758 if (ret < 0) {
1759 dev_err(bus->dev,
1760 "De-prepare port(s) failed: %d\n", ret);
1761 stream->state = state;
1762 return ret;
1763 }
1764
1765 multi_lane_bandwidth = 0;
1766
1767 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1768 if (!p_rt->lane)
1769 continue;
1770
1771 bandwidth = m_rt->stream->params.rate * hweight32(p_rt->ch_mask) *
1772 m_rt->stream->params.bps;
1773 multi_lane_bandwidth += bandwidth;
1774 bus->lane_used_bandwidth[p_rt->lane] -= bandwidth;
1775 if (!bus->lane_used_bandwidth[p_rt->lane])
1776 p_rt->lane = 0;
1777 }
1778 /* TODO: Update this during Device-Device support */
1779 bandwidth = m_rt->stream->params.rate * m_rt->ch_count * m_rt->stream->params.bps;
1780 bus->params.bandwidth -= bandwidth - multi_lane_bandwidth;
1781
1782 /* Compute params */
1783 if (bus->compute_params) {
1784 ret = bus->compute_params(bus, stream);
1785 if (ret < 0) {
1786 dev_err(bus->dev, "Compute params failed: %d\n",
1787 ret);
1788 stream->state = state;
1789 return ret;
1790 }
1791 }
1792
1793 /* Program params */
1794 ret = sdw_program_params(bus, false);
1795 if (ret < 0) {
1796 dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1797 stream->state = state;
1798 return ret;
1799 }
1800 }
1801
1802 return do_bank_switch(stream);
1803 }
1804
1805 /**
1806 * sdw_deprepare_stream() - Deprepare SoundWire stream
1807 *
1808 * @stream: Soundwire stream
1809 *
1810 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1811 */
sdw_deprepare_stream(struct sdw_stream_runtime * stream)1812 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1813 {
1814 int ret;
1815
1816 if (!stream) {
1817 pr_err("SoundWire: Handle not found for stream\n");
1818 return -EINVAL;
1819 }
1820
1821 sdw_acquire_bus_lock(stream);
1822
1823 if (stream->state == SDW_STREAM_DEPREPARED) {
1824 ret = 0;
1825 goto state_err;
1826 }
1827
1828 if (stream->state != SDW_STREAM_PREPARED &&
1829 stream->state != SDW_STREAM_DISABLED) {
1830 pr_err("%s: %s: inconsistent state state %d\n",
1831 __func__, stream->name, stream->state);
1832 ret = -EINVAL;
1833 goto state_err;
1834 }
1835
1836 ret = _sdw_deprepare_stream(stream);
1837
1838 state_err:
1839 sdw_release_bus_lock(stream);
1840 return ret;
1841 }
1842 EXPORT_SYMBOL(sdw_deprepare_stream);
1843
set_stream(struct snd_pcm_substream * substream,struct sdw_stream_runtime * sdw_stream)1844 static int set_stream(struct snd_pcm_substream *substream,
1845 struct sdw_stream_runtime *sdw_stream)
1846 {
1847 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1848 struct snd_soc_dai *dai;
1849 int ret = 0;
1850 int i;
1851
1852 /* Set stream pointer on all DAIs */
1853 for_each_rtd_dais(rtd, i, dai) {
1854 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1855 if (ret < 0) {
1856 dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1857 break;
1858 }
1859 }
1860
1861 return ret;
1862 }
1863
1864 /**
1865 * sdw_alloc_stream() - Allocate and return stream runtime
1866 *
1867 * @stream_name: SoundWire stream name
1868 * @type: stream type (could be PCM ,PDM or BPT)
1869 *
1870 * Allocates a SoundWire stream runtime instance.
1871 * sdw_alloc_stream should be called only once per stream. Typically
1872 * invoked from ALSA/ASoC machine/platform driver.
1873 */
sdw_alloc_stream(const char * stream_name,enum sdw_stream_type type)1874 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name, enum sdw_stream_type type)
1875 {
1876 struct sdw_stream_runtime *stream;
1877
1878 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
1879 if (!stream)
1880 return NULL;
1881
1882 stream->name = stream_name;
1883 INIT_LIST_HEAD(&stream->master_list);
1884 stream->state = SDW_STREAM_ALLOCATED;
1885 stream->m_rt_count = 0;
1886 stream->type = type;
1887
1888 return stream;
1889 }
1890 EXPORT_SYMBOL(sdw_alloc_stream);
1891
1892 /**
1893 * sdw_startup_stream() - Startup SoundWire stream
1894 *
1895 * @sdw_substream: Soundwire stream
1896 *
1897 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1898 */
sdw_startup_stream(void * sdw_substream)1899 int sdw_startup_stream(void *sdw_substream)
1900 {
1901 struct snd_pcm_substream *substream = sdw_substream;
1902 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1903 struct sdw_stream_runtime *sdw_stream;
1904 char *name;
1905 int ret;
1906
1907 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1908 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1909 else
1910 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1911
1912 if (!name)
1913 return -ENOMEM;
1914
1915 sdw_stream = sdw_alloc_stream(name, SDW_STREAM_PCM);
1916 if (!sdw_stream) {
1917 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1918 ret = -ENOMEM;
1919 goto error;
1920 }
1921
1922 ret = set_stream(substream, sdw_stream);
1923 if (ret < 0)
1924 goto release_stream;
1925 return 0;
1926
1927 release_stream:
1928 sdw_release_stream(sdw_stream);
1929 set_stream(substream, NULL);
1930 error:
1931 kfree(name);
1932 return ret;
1933 }
1934 EXPORT_SYMBOL(sdw_startup_stream);
1935
1936 /**
1937 * sdw_shutdown_stream() - Shutdown SoundWire stream
1938 *
1939 * @sdw_substream: Soundwire stream
1940 *
1941 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1942 */
sdw_shutdown_stream(void * sdw_substream)1943 void sdw_shutdown_stream(void *sdw_substream)
1944 {
1945 struct snd_pcm_substream *substream = sdw_substream;
1946 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1947 struct sdw_stream_runtime *sdw_stream;
1948 struct snd_soc_dai *dai;
1949
1950 /* Find stream from first CPU DAI */
1951 dai = snd_soc_rtd_to_cpu(rtd, 0);
1952
1953 sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1954
1955 if (IS_ERR(sdw_stream)) {
1956 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1957 return;
1958 }
1959
1960 /* release memory */
1961 kfree(sdw_stream->name);
1962 sdw_release_stream(sdw_stream);
1963
1964 /* clear DAI data */
1965 set_stream(substream, NULL);
1966 }
1967 EXPORT_SYMBOL(sdw_shutdown_stream);
1968
1969 /**
1970 * sdw_release_stream() - Free the assigned stream runtime
1971 *
1972 * @stream: SoundWire stream runtime
1973 *
1974 * sdw_release_stream should be called only once per stream
1975 */
sdw_release_stream(struct sdw_stream_runtime * stream)1976 void sdw_release_stream(struct sdw_stream_runtime *stream)
1977 {
1978 kfree(stream);
1979 }
1980 EXPORT_SYMBOL(sdw_release_stream);
1981
1982 /**
1983 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1984 *
1985 * @bus: SDW Bus instance
1986 * @stream_config: Stream configuration for audio stream
1987 * @port_config: Port configuration for audio stream
1988 * @num_ports: Number of ports
1989 * @stream: SoundWire stream
1990 */
sdw_stream_add_master(struct sdw_bus * bus,struct sdw_stream_config * stream_config,const struct sdw_port_config * port_config,unsigned int num_ports,struct sdw_stream_runtime * stream)1991 int sdw_stream_add_master(struct sdw_bus *bus,
1992 struct sdw_stream_config *stream_config,
1993 const struct sdw_port_config *port_config,
1994 unsigned int num_ports,
1995 struct sdw_stream_runtime *stream)
1996 {
1997 struct sdw_master_runtime *m_rt;
1998 bool alloc_master_rt = false;
1999 int ret;
2000
2001 mutex_lock(&bus->bus_lock);
2002
2003 /*
2004 * For multi link streams, add the second master only if
2005 * the bus supports it.
2006 * Check if bus->multi_link is set
2007 */
2008 if (!bus->multi_link && stream->m_rt_count > 0) {
2009 dev_err(bus->dev,
2010 "Multilink not supported, link %d\n", bus->link_id);
2011 ret = -EINVAL;
2012 goto unlock;
2013 }
2014
2015 /*
2016 * check if Master is already allocated (e.g. as a result of Slave adding
2017 * it first), if so skip allocation and go to configuration
2018 */
2019 m_rt = sdw_master_rt_find(bus, stream);
2020 if (!m_rt) {
2021 m_rt = sdw_master_rt_alloc(bus, stream);
2022 if (IS_ERR(m_rt)) {
2023 ret = PTR_ERR(m_rt);
2024 dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s: %d\n",
2025 __func__, stream->name, ret);
2026 goto unlock;
2027 }
2028 if (!m_rt) {
2029 dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
2030 __func__, stream->name);
2031 ret = -ENOMEM;
2032 goto unlock;
2033 }
2034
2035 alloc_master_rt = true;
2036 }
2037
2038 if (!sdw_master_port_allocated(m_rt)) {
2039 ret = sdw_master_port_alloc(m_rt, num_ports);
2040 if (ret)
2041 goto alloc_error;
2042
2043 stream->m_rt_count++;
2044 }
2045
2046 ret = sdw_master_rt_config(m_rt, stream_config);
2047 if (ret < 0)
2048 goto unlock;
2049
2050 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
2051 if (ret)
2052 goto unlock;
2053
2054 ret = sdw_master_port_config(m_rt, port_config);
2055
2056 goto unlock;
2057
2058 alloc_error:
2059 /*
2060 * we only cleanup what was allocated in this routine
2061 */
2062 if (alloc_master_rt)
2063 sdw_master_rt_free(m_rt, stream);
2064 unlock:
2065 mutex_unlock(&bus->bus_lock);
2066 return ret;
2067 }
2068 EXPORT_SYMBOL(sdw_stream_add_master);
2069
2070 /**
2071 * sdw_stream_remove_master() - Remove master from sdw_stream
2072 *
2073 * @bus: SDW Bus instance
2074 * @stream: SoundWire stream
2075 *
2076 * This removes and frees port_rt and master_rt from a stream
2077 */
sdw_stream_remove_master(struct sdw_bus * bus,struct sdw_stream_runtime * stream)2078 int sdw_stream_remove_master(struct sdw_bus *bus,
2079 struct sdw_stream_runtime *stream)
2080 {
2081 struct sdw_master_runtime *m_rt, *_m_rt;
2082
2083 mutex_lock(&bus->bus_lock);
2084
2085 list_for_each_entry_safe(m_rt, _m_rt,
2086 &stream->master_list, stream_node) {
2087 if (m_rt->bus != bus)
2088 continue;
2089
2090 sdw_master_port_free(m_rt);
2091 sdw_master_rt_free(m_rt, stream);
2092 stream->m_rt_count--;
2093 }
2094
2095 if (list_empty(&stream->master_list))
2096 stream->state = SDW_STREAM_RELEASED;
2097
2098 mutex_unlock(&bus->bus_lock);
2099
2100 return 0;
2101 }
2102 EXPORT_SYMBOL(sdw_stream_remove_master);
2103
2104 /**
2105 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
2106 *
2107 * @slave: SDW Slave instance
2108 * @stream_config: Stream configuration for audio stream
2109 * @stream: SoundWire stream
2110 * @port_config: Port configuration for audio stream
2111 * @num_ports: Number of ports
2112 *
2113 * It is expected that Slave is added before adding Master
2114 * to the Stream.
2115 *
2116 */
sdw_stream_add_slave(struct sdw_slave * slave,struct sdw_stream_config * stream_config,const struct sdw_port_config * port_config,unsigned int num_ports,struct sdw_stream_runtime * stream)2117 int sdw_stream_add_slave(struct sdw_slave *slave,
2118 struct sdw_stream_config *stream_config,
2119 const struct sdw_port_config *port_config,
2120 unsigned int num_ports,
2121 struct sdw_stream_runtime *stream)
2122 {
2123 struct sdw_slave_runtime *s_rt;
2124 struct sdw_master_runtime *m_rt;
2125 bool alloc_master_rt = false;
2126 bool alloc_slave_rt = false;
2127
2128 int ret;
2129
2130 mutex_lock(&slave->bus->bus_lock);
2131
2132 /*
2133 * check if Master is already allocated, if so skip allocation
2134 * and go to configuration
2135 */
2136 m_rt = sdw_master_rt_find(slave->bus, stream);
2137 if (!m_rt) {
2138 /*
2139 * If this API is invoked by Slave first then m_rt is not valid.
2140 * So, allocate m_rt and add Slave to it.
2141 */
2142 m_rt = sdw_master_rt_alloc(slave->bus, stream);
2143 if (IS_ERR(m_rt)) {
2144 ret = PTR_ERR(m_rt);
2145 dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s: %d\n",
2146 __func__, stream->name, ret);
2147 goto unlock;
2148 }
2149 if (!m_rt) {
2150 dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
2151 __func__, stream->name);
2152 ret = -ENOMEM;
2153 goto unlock;
2154 }
2155
2156 alloc_master_rt = true;
2157 }
2158
2159 s_rt = sdw_slave_rt_find(slave, stream);
2160 if (!s_rt) {
2161 s_rt = sdw_slave_rt_alloc(slave, m_rt);
2162 if (!s_rt) {
2163 dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n",
2164 stream->name);
2165 ret = -ENOMEM;
2166 goto alloc_error;
2167 }
2168
2169 alloc_slave_rt = true;
2170 }
2171
2172 if (!sdw_slave_port_allocated(s_rt)) {
2173 ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
2174 if (ret)
2175 goto alloc_error;
2176 }
2177
2178 ret = sdw_master_rt_config(m_rt, stream_config);
2179 if (ret)
2180 goto unlock;
2181
2182 ret = sdw_slave_rt_config(s_rt, stream_config);
2183 if (ret)
2184 goto unlock;
2185
2186 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
2187 if (ret)
2188 goto unlock;
2189
2190 ret = sdw_slave_port_config(slave, s_rt, port_config,
2191 stream->type == SDW_STREAM_BPT);
2192 if (ret)
2193 goto unlock;
2194
2195 /*
2196 * Change stream state to CONFIGURED on first Slave add.
2197 * Bus is not aware of number of Slave(s) in a stream at this
2198 * point so cannot depend on all Slave(s) to be added in order to
2199 * change stream state to CONFIGURED.
2200 */
2201 stream->state = SDW_STREAM_CONFIGURED;
2202 goto unlock;
2203
2204 alloc_error:
2205 /*
2206 * we only cleanup what was allocated in this routine. The 'else if'
2207 * is intentional, the 'master_rt_free' will call sdw_slave_rt_free()
2208 * internally.
2209 */
2210 if (alloc_master_rt)
2211 sdw_master_rt_free(m_rt, stream);
2212 else if (alloc_slave_rt)
2213 sdw_slave_rt_free(slave, stream);
2214 unlock:
2215 mutex_unlock(&slave->bus->bus_lock);
2216 return ret;
2217 }
2218 EXPORT_SYMBOL(sdw_stream_add_slave);
2219
2220 /**
2221 * sdw_stream_remove_slave() - Remove slave from sdw_stream
2222 *
2223 * @slave: SDW Slave instance
2224 * @stream: SoundWire stream
2225 *
2226 * This removes and frees port_rt and slave_rt from a stream
2227 */
sdw_stream_remove_slave(struct sdw_slave * slave,struct sdw_stream_runtime * stream)2228 int sdw_stream_remove_slave(struct sdw_slave *slave,
2229 struct sdw_stream_runtime *stream)
2230 {
2231 mutex_lock(&slave->bus->bus_lock);
2232
2233 sdw_slave_port_free(slave, stream);
2234 sdw_slave_rt_free(slave, stream);
2235
2236 mutex_unlock(&slave->bus->bus_lock);
2237
2238 return 0;
2239 }
2240 EXPORT_SYMBOL(sdw_stream_remove_slave);
2241