xref: /openbmc/linux/drivers/soundwire/stream.c (revision 28425a10)
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  */
26 int 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};
29 EXPORT_SYMBOL(sdw_rows);
30 
31 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
32 EXPORT_SYMBOL(sdw_cols);
33 
sdw_find_col_index(int col)34 int 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 }
46 EXPORT_SYMBOL(sdw_find_col_index);
47 
sdw_find_row_index(int row)48 int 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 }
60 EXPORT_SYMBOL(sdw_find_row_index);
61 
_sdw_program_slave_port_params(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_transport_params * t_params,enum sdw_dpn_type type)62 static 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_no_pm(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_no_pm(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_no_pm(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_no_pm(slave, addr4, wbuf);
119 	if (ret < 0)
120 		dev_err(bus->dev, "DPN_HCtrl register write failed\n");
121 
122 	return ret;
123 }
124 
sdw_program_slave_port_params(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt)125 static 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_no_pm(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_no_pm(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_no_pm(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_no_pm(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_no_pm(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_no_pm(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 
sdw_program_master_port_params(struct sdw_bus * bus,struct sdw_port_runtime * p_rt)238 static 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  */
sdw_program_port_params(struct sdw_master_runtime * m_rt)266 static 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  */
sdw_enable_disable_slave_ports(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt,bool en)303 static 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_no_pm(s_rt->slave, addr, p_rt->ch_mask);
323 	else
324 		ret = sdw_write_no_pm(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 
sdw_enable_disable_master_ports(struct sdw_master_runtime * m_rt,struct sdw_port_runtime * p_rt,bool en)334 static 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  */
sdw_enable_disable_ports(struct sdw_master_runtime * m_rt,bool en)375 static 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 
sdw_do_port_prep(struct sdw_slave_runtime * s_rt,struct sdw_prepare_ch prep_ch,enum sdw_port_prep_ops cmd)401 static 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 
sdw_prep_deprep_slave_ports(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt,bool prep)427 static 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, prep ? SDW_OPS_PORT_PRE_PREP : SDW_OPS_PORT_PRE_DEPREP);
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_no_pm(s_rt->slave, addr, p_rt->ch_mask);
480 		else
481 			ret = sdw_write_no_pm(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_no_pm(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, prep ? SDW_OPS_PORT_POST_PREP : SDW_OPS_PORT_POST_DEPREP);
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 
sdw_prep_deprep_master_ports(struct sdw_master_runtime * m_rt,struct sdw_port_runtime * p_rt,bool prep)514 static 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  */
sdw_prep_deprep_ports(struct sdw_master_runtime * m_rt,bool prep)549 static 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  */
sdw_notify_config(struct sdw_master_runtime * m_rt)583 static 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  */
sdw_program_params(struct sdw_bus * bus,bool prepare)629 static 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 
sdw_bank_switch(struct sdw_bus * bus,int m_rt_count)674 static 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 	wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
688 	if (!wbuf) {
689 		ret = -ENOMEM;
690 		goto error_1;
691 	}
692 
693 	/* Get row and column index to program register */
694 	col_index = sdw_find_col_index(bus->params.col);
695 	row_index = sdw_find_row_index(bus->params.row);
696 	wbuf[0] = col_index | (row_index << 3);
697 
698 	if (bus->params.next_bank)
699 		addr = SDW_SCP_FRAMECTRL_B1;
700 	else
701 		addr = SDW_SCP_FRAMECTRL_B0;
702 
703 	sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
704 		     SDW_MSG_FLAG_WRITE, wbuf);
705 	wr_msg->ssp_sync = true;
706 
707 	/*
708 	 * Set the multi_link flag only when both the hardware supports
709 	 * and hardware-based sync is required
710 	 */
711 	multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
712 
713 	if (multi_link)
714 		ret = sdw_transfer_defer(bus, wr_msg);
715 	else
716 		ret = sdw_transfer(bus, wr_msg);
717 
718 	if (ret < 0 && ret != -ENODATA) {
719 		dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
720 		goto error;
721 	}
722 
723 	if (!multi_link) {
724 		kfree(wbuf);
725 		kfree(wr_msg);
726 		bus->defer_msg.msg = NULL;
727 		bus->params.curr_bank = !bus->params.curr_bank;
728 		bus->params.next_bank = !bus->params.next_bank;
729 	}
730 
731 	return 0;
732 
733 error:
734 	kfree(wbuf);
735 error_1:
736 	kfree(wr_msg);
737 	bus->defer_msg.msg = NULL;
738 	return ret;
739 }
740 
741 /**
742  * sdw_ml_sync_bank_switch: Multilink register bank switch
743  *
744  * @bus: SDW bus instance
745  * @multi_link: whether this is a multi-link stream with hardware-based sync
746  *
747  * Caller function should free the buffers on error
748  */
sdw_ml_sync_bank_switch(struct sdw_bus * bus,bool multi_link)749 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus, bool multi_link)
750 {
751 	unsigned long time_left;
752 
753 	if (!multi_link)
754 		return 0;
755 
756 	/* Wait for completion of transfer */
757 	time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
758 						bus->bank_switch_timeout);
759 
760 	if (!time_left) {
761 		dev_err(bus->dev, "Controller Timed out on bank switch\n");
762 		return -ETIMEDOUT;
763 	}
764 
765 	bus->params.curr_bank = !bus->params.curr_bank;
766 	bus->params.next_bank = !bus->params.next_bank;
767 
768 	if (bus->defer_msg.msg) {
769 		kfree(bus->defer_msg.msg->buf);
770 		kfree(bus->defer_msg.msg);
771 		bus->defer_msg.msg = NULL;
772 	}
773 
774 	return 0;
775 }
776 
do_bank_switch(struct sdw_stream_runtime * stream)777 static 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, multi_link);
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 
864 error:
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 			bus->defer_msg.msg = NULL;
871 		}
872 	}
873 
874 msg_unlock:
875 
876 	if (multi_link) {
877 		list_for_each_entry(m_rt, &stream->master_list, stream_node) {
878 			bus = m_rt->bus;
879 			if (mutex_is_locked(&bus->msg_lock))
880 				mutex_unlock(&bus->msg_lock);
881 		}
882 	}
883 
884 	return ret;
885 }
886 
sdw_port_alloc(struct list_head * port_list)887 static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
888 {
889 	struct sdw_port_runtime *p_rt;
890 
891 	p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
892 	if (!p_rt)
893 		return NULL;
894 
895 	list_add_tail(&p_rt->port_node, port_list);
896 
897 	return p_rt;
898 }
899 
sdw_port_config(struct sdw_port_runtime * p_rt,struct sdw_port_config * port_config,int port_index)900 static int sdw_port_config(struct sdw_port_runtime *p_rt,
901 			   struct sdw_port_config *port_config,
902 			   int port_index)
903 {
904 	p_rt->ch_mask = port_config[port_index].ch_mask;
905 	p_rt->num = port_config[port_index].num;
906 
907 	/*
908 	 * TODO: Check port capabilities for requested configuration
909 	 */
910 
911 	return 0;
912 }
913 
sdw_port_free(struct sdw_port_runtime * p_rt)914 static void sdw_port_free(struct sdw_port_runtime *p_rt)
915 {
916 	list_del(&p_rt->port_node);
917 	kfree(p_rt);
918 }
919 
sdw_slave_port_allocated(struct sdw_slave_runtime * s_rt)920 static bool sdw_slave_port_allocated(struct sdw_slave_runtime *s_rt)
921 {
922 	return !list_empty(&s_rt->port_list);
923 }
924 
sdw_slave_port_free(struct sdw_slave * slave,struct sdw_stream_runtime * stream)925 static void sdw_slave_port_free(struct sdw_slave *slave,
926 				struct sdw_stream_runtime *stream)
927 {
928 	struct sdw_port_runtime *p_rt, *_p_rt;
929 	struct sdw_master_runtime *m_rt;
930 	struct sdw_slave_runtime *s_rt;
931 
932 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
933 		list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
934 			if (s_rt->slave != slave)
935 				continue;
936 
937 			list_for_each_entry_safe(p_rt, _p_rt,
938 						 &s_rt->port_list, port_node) {
939 				sdw_port_free(p_rt);
940 			}
941 		}
942 	}
943 }
944 
sdw_slave_port_alloc(struct sdw_slave * slave,struct sdw_slave_runtime * s_rt,unsigned int num_config)945 static int sdw_slave_port_alloc(struct sdw_slave *slave,
946 				struct sdw_slave_runtime *s_rt,
947 				unsigned int num_config)
948 {
949 	struct sdw_port_runtime *p_rt;
950 	int i;
951 
952 	/* Iterate for number of ports to perform initialization */
953 	for (i = 0; i < num_config; i++) {
954 		p_rt = sdw_port_alloc(&s_rt->port_list);
955 		if (!p_rt)
956 			return -ENOMEM;
957 	}
958 
959 	return 0;
960 }
961 
sdw_slave_port_is_valid_range(struct device * dev,int num)962 static int sdw_slave_port_is_valid_range(struct device *dev, int num)
963 {
964 	if (!SDW_VALID_PORT_RANGE(num)) {
965 		dev_err(dev, "SoundWire: Invalid port number :%d\n", num);
966 		return -EINVAL;
967 	}
968 
969 	return 0;
970 }
971 
sdw_slave_port_config(struct sdw_slave * slave,struct sdw_slave_runtime * s_rt,struct sdw_port_config * port_config)972 static int sdw_slave_port_config(struct sdw_slave *slave,
973 				 struct sdw_slave_runtime *s_rt,
974 				 struct sdw_port_config *port_config)
975 {
976 	struct sdw_port_runtime *p_rt;
977 	int ret;
978 	int i;
979 
980 	i = 0;
981 	list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
982 		/*
983 		 * TODO: Check valid port range as defined by DisCo/
984 		 * slave
985 		 */
986 		ret = sdw_slave_port_is_valid_range(&slave->dev, port_config[i].num);
987 		if (ret < 0)
988 			return ret;
989 
990 		ret = sdw_port_config(p_rt, port_config, i);
991 		if (ret < 0)
992 			return ret;
993 		i++;
994 	}
995 
996 	return 0;
997 }
998 
sdw_master_port_allocated(struct sdw_master_runtime * m_rt)999 static bool sdw_master_port_allocated(struct sdw_master_runtime *m_rt)
1000 {
1001 	return !list_empty(&m_rt->port_list);
1002 }
1003 
sdw_master_port_free(struct sdw_master_runtime * m_rt)1004 static void sdw_master_port_free(struct sdw_master_runtime *m_rt)
1005 {
1006 	struct sdw_port_runtime *p_rt, *_p_rt;
1007 
1008 	list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1009 		sdw_port_free(p_rt);
1010 	}
1011 }
1012 
sdw_master_port_alloc(struct sdw_master_runtime * m_rt,unsigned int num_ports)1013 static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
1014 				 unsigned int num_ports)
1015 {
1016 	struct sdw_port_runtime *p_rt;
1017 	int i;
1018 
1019 	/* Iterate for number of ports to perform initialization */
1020 	for (i = 0; i < num_ports; i++) {
1021 		p_rt = sdw_port_alloc(&m_rt->port_list);
1022 		if (!p_rt)
1023 			return -ENOMEM;
1024 	}
1025 
1026 	return 0;
1027 }
1028 
sdw_master_port_config(struct sdw_master_runtime * m_rt,struct sdw_port_config * port_config)1029 static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
1030 				  struct sdw_port_config *port_config)
1031 {
1032 	struct sdw_port_runtime *p_rt;
1033 	int ret;
1034 	int i;
1035 
1036 	i = 0;
1037 	list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1038 		ret = sdw_port_config(p_rt, port_config, i);
1039 		if (ret < 0)
1040 			return ret;
1041 		i++;
1042 	}
1043 
1044 	return 0;
1045 }
1046 
1047 /**
1048  * sdw_slave_rt_alloc() - Allocate a Slave runtime handle.
1049  *
1050  * @slave: Slave handle
1051  * @m_rt: Master runtime handle
1052  *
1053  * This function is to be called with bus_lock held.
1054  */
1055 static struct sdw_slave_runtime
sdw_slave_rt_alloc(struct sdw_slave * slave,struct sdw_master_runtime * m_rt)1056 *sdw_slave_rt_alloc(struct sdw_slave *slave,
1057 		    struct sdw_master_runtime *m_rt)
1058 {
1059 	struct sdw_slave_runtime *s_rt;
1060 
1061 	s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1062 	if (!s_rt)
1063 		return NULL;
1064 
1065 	INIT_LIST_HEAD(&s_rt->port_list);
1066 	s_rt->slave = slave;
1067 
1068 	list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1069 
1070 	return s_rt;
1071 }
1072 
1073 /**
1074  * sdw_slave_rt_config() - Configure a Slave runtime handle.
1075  *
1076  * @s_rt: Slave runtime handle
1077  * @stream_config: Stream configuration
1078  *
1079  * This function is to be called with bus_lock held.
1080  */
sdw_slave_rt_config(struct sdw_slave_runtime * s_rt,struct sdw_stream_config * stream_config)1081 static int sdw_slave_rt_config(struct sdw_slave_runtime *s_rt,
1082 			       struct sdw_stream_config *stream_config)
1083 {
1084 	s_rt->ch_count = stream_config->ch_count;
1085 	s_rt->direction = stream_config->direction;
1086 
1087 	return 0;
1088 }
1089 
sdw_slave_rt_find(struct sdw_slave * slave,struct sdw_stream_runtime * stream)1090 static struct sdw_slave_runtime *sdw_slave_rt_find(struct sdw_slave *slave,
1091 						   struct sdw_stream_runtime *stream)
1092 {
1093 	struct sdw_slave_runtime *s_rt, *_s_rt;
1094 	struct sdw_master_runtime *m_rt;
1095 
1096 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1097 		/* Retrieve Slave runtime handle */
1098 		list_for_each_entry_safe(s_rt, _s_rt,
1099 					 &m_rt->slave_rt_list, m_rt_node) {
1100 			if (s_rt->slave == slave)
1101 				return s_rt;
1102 		}
1103 	}
1104 	return NULL;
1105 }
1106 
1107 /**
1108  * sdw_slave_rt_free() - Free Slave(s) runtime handle
1109  *
1110  * @slave: Slave handle.
1111  * @stream: Stream runtime handle.
1112  *
1113  * This function is to be called with bus_lock held.
1114  */
sdw_slave_rt_free(struct sdw_slave * slave,struct sdw_stream_runtime * stream)1115 static void sdw_slave_rt_free(struct sdw_slave *slave,
1116 			      struct sdw_stream_runtime *stream)
1117 {
1118 	struct sdw_slave_runtime *s_rt;
1119 
1120 	s_rt = sdw_slave_rt_find(slave, stream);
1121 	if (s_rt) {
1122 		list_del(&s_rt->m_rt_node);
1123 		kfree(s_rt);
1124 	}
1125 }
1126 
1127 static struct sdw_master_runtime
sdw_master_rt_find(struct sdw_bus * bus,struct sdw_stream_runtime * stream)1128 *sdw_master_rt_find(struct sdw_bus *bus,
1129 		    struct sdw_stream_runtime *stream)
1130 {
1131 	struct sdw_master_runtime *m_rt;
1132 
1133 	/* Retrieve Bus handle if already available */
1134 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1135 		if (m_rt->bus == bus)
1136 			return m_rt;
1137 	}
1138 
1139 	return NULL;
1140 }
1141 
1142 /**
1143  * sdw_master_rt_alloc() - Allocates a Master runtime handle
1144  *
1145  * @bus: SDW bus instance
1146  * @stream: Stream runtime handle.
1147  *
1148  * This function is to be called with bus_lock held.
1149  */
1150 static struct sdw_master_runtime
sdw_master_rt_alloc(struct sdw_bus * bus,struct sdw_stream_runtime * stream)1151 *sdw_master_rt_alloc(struct sdw_bus *bus,
1152 		     struct sdw_stream_runtime *stream)
1153 {
1154 	struct sdw_master_runtime *m_rt, *walk_m_rt;
1155 	struct list_head *insert_after;
1156 
1157 	m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
1158 	if (!m_rt)
1159 		return NULL;
1160 
1161 	/* Initialization of Master runtime handle */
1162 	INIT_LIST_HEAD(&m_rt->port_list);
1163 	INIT_LIST_HEAD(&m_rt->slave_rt_list);
1164 
1165 	/*
1166 	 * Add in order of bus id so that when taking the bus_lock
1167 	 * of multiple buses they will always be taken in the same
1168 	 * order to prevent a mutex deadlock.
1169 	 */
1170 	insert_after = &stream->master_list;
1171 	list_for_each_entry_reverse(walk_m_rt, &stream->master_list, stream_node) {
1172 		if (walk_m_rt->bus->id < bus->id) {
1173 			insert_after = &walk_m_rt->stream_node;
1174 			break;
1175 		}
1176 	}
1177 	list_add(&m_rt->stream_node, insert_after);
1178 
1179 	list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
1180 
1181 	m_rt->bus = bus;
1182 	m_rt->stream = stream;
1183 
1184 	return m_rt;
1185 }
1186 
1187 /**
1188  * sdw_master_rt_config() - Configure Master runtime handle
1189  *
1190  * @m_rt: Master runtime handle
1191  * @stream_config: Stream configuration
1192  *
1193  * This function is to be called with bus_lock held.
1194  */
1195 
sdw_master_rt_config(struct sdw_master_runtime * m_rt,struct sdw_stream_config * stream_config)1196 static int sdw_master_rt_config(struct sdw_master_runtime *m_rt,
1197 				struct sdw_stream_config *stream_config)
1198 {
1199 	m_rt->ch_count = stream_config->ch_count;
1200 	m_rt->direction = stream_config->direction;
1201 
1202 	return 0;
1203 }
1204 
1205 /**
1206  * sdw_master_rt_free() - Free Master runtime handle
1207  *
1208  * @m_rt: Master runtime node
1209  * @stream: Stream runtime handle.
1210  *
1211  * This function is to be called with bus_lock held
1212  * It frees the Master runtime handle and associated Slave(s) runtime
1213  * handle. If this is called first then sdw_slave_rt_free() will have
1214  * no effect as Slave(s) runtime handle would already be freed up.
1215  */
sdw_master_rt_free(struct sdw_master_runtime * m_rt,struct sdw_stream_runtime * stream)1216 static void sdw_master_rt_free(struct sdw_master_runtime *m_rt,
1217 			       struct sdw_stream_runtime *stream)
1218 {
1219 	struct sdw_slave_runtime *s_rt, *_s_rt;
1220 
1221 	list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1222 		sdw_slave_port_free(s_rt->slave, stream);
1223 		sdw_slave_rt_free(s_rt->slave, stream);
1224 	}
1225 
1226 	list_del(&m_rt->stream_node);
1227 	list_del(&m_rt->bus_node);
1228 	kfree(m_rt);
1229 }
1230 
1231 /**
1232  * sdw_config_stream() - Configure the allocated stream
1233  *
1234  * @dev: SDW device
1235  * @stream: SoundWire stream
1236  * @stream_config: Stream configuration for audio stream
1237  * @is_slave: is API called from Slave or Master
1238  *
1239  * This function is to be called with bus_lock held.
1240  */
sdw_config_stream(struct device * dev,struct sdw_stream_runtime * stream,struct sdw_stream_config * stream_config,bool is_slave)1241 static int sdw_config_stream(struct device *dev,
1242 			     struct sdw_stream_runtime *stream,
1243 			     struct sdw_stream_config *stream_config,
1244 			     bool is_slave)
1245 {
1246 	/*
1247 	 * Update the stream rate, channel and bps based on data
1248 	 * source. For more than one data source (multilink),
1249 	 * match the rate, bps, stream type and increment number of channels.
1250 	 *
1251 	 * If rate/bps is zero, it means the values are not set, so skip
1252 	 * comparison and allow the value to be set and stored in stream
1253 	 */
1254 	if (stream->params.rate &&
1255 	    stream->params.rate != stream_config->frame_rate) {
1256 		dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1257 		return -EINVAL;
1258 	}
1259 
1260 	if (stream->params.bps &&
1261 	    stream->params.bps != stream_config->bps) {
1262 		dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1263 		return -EINVAL;
1264 	}
1265 
1266 	stream->type = stream_config->type;
1267 	stream->params.rate = stream_config->frame_rate;
1268 	stream->params.bps = stream_config->bps;
1269 
1270 	/* TODO: Update this check during Device-device support */
1271 	if (is_slave)
1272 		stream->params.ch_count += stream_config->ch_count;
1273 
1274 	return 0;
1275 }
1276 
1277 /**
1278  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1279  *
1280  * @slave: Slave handle
1281  * @direction: Data direction.
1282  * @port_num: Port number
1283  */
sdw_get_slave_dpn_prop(struct sdw_slave * slave,enum sdw_data_direction direction,unsigned int port_num)1284 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1285 					    enum sdw_data_direction direction,
1286 					    unsigned int port_num)
1287 {
1288 	struct sdw_dpn_prop *dpn_prop;
1289 	u8 num_ports;
1290 	int i;
1291 
1292 	if (direction == SDW_DATA_DIR_TX) {
1293 		num_ports = hweight32(slave->prop.source_ports);
1294 		dpn_prop = slave->prop.src_dpn_prop;
1295 	} else {
1296 		num_ports = hweight32(slave->prop.sink_ports);
1297 		dpn_prop = slave->prop.sink_dpn_prop;
1298 	}
1299 
1300 	for (i = 0; i < num_ports; i++) {
1301 		if (dpn_prop[i].num == port_num)
1302 			return &dpn_prop[i];
1303 	}
1304 
1305 	return NULL;
1306 }
1307 
1308 /**
1309  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1310  *
1311  * @stream: SoundWire stream
1312  *
1313  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1314  * stream to reconfigure the bus.
1315  * NOTE: This function is called from SoundWire stream ops and is
1316  * expected that a global lock is held before acquiring bus_lock.
1317  */
sdw_acquire_bus_lock(struct sdw_stream_runtime * stream)1318 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1319 {
1320 	struct sdw_master_runtime *m_rt;
1321 	struct sdw_bus *bus;
1322 
1323 	/* Iterate for all Master(s) in Master list */
1324 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1325 		bus = m_rt->bus;
1326 
1327 		mutex_lock(&bus->bus_lock);
1328 	}
1329 }
1330 
1331 /**
1332  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1333  *
1334  * @stream: SoundWire stream
1335  *
1336  * Release the previously held bus_lock after reconfiguring the bus.
1337  * NOTE: This function is called from SoundWire stream ops and is
1338  * expected that a global lock is held before releasing bus_lock.
1339  */
sdw_release_bus_lock(struct sdw_stream_runtime * stream)1340 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1341 {
1342 	struct sdw_master_runtime *m_rt;
1343 	struct sdw_bus *bus;
1344 
1345 	/* Iterate for all Master(s) in Master list */
1346 	list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1347 		bus = m_rt->bus;
1348 		mutex_unlock(&bus->bus_lock);
1349 	}
1350 }
1351 
_sdw_prepare_stream(struct sdw_stream_runtime * stream,bool update_params)1352 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1353 			       bool update_params)
1354 {
1355 	struct sdw_master_runtime *m_rt;
1356 	struct sdw_bus *bus;
1357 	struct sdw_master_prop *prop;
1358 	struct sdw_bus_params params;
1359 	int ret;
1360 
1361 	/* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1362 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1363 		bus = m_rt->bus;
1364 		prop = &bus->prop;
1365 		memcpy(&params, &bus->params, sizeof(params));
1366 
1367 		/* TODO: Support Asynchronous mode */
1368 		if ((prop->max_clk_freq % stream->params.rate) != 0) {
1369 			dev_err(bus->dev, "Async mode not supported\n");
1370 			return -EINVAL;
1371 		}
1372 
1373 		if (update_params) {
1374 			/* Increment cumulative bus bandwidth */
1375 			/* TODO: Update this during Device-Device support */
1376 			bus->params.bandwidth += m_rt->stream->params.rate *
1377 				m_rt->ch_count * m_rt->stream->params.bps;
1378 
1379 			/* Compute params */
1380 			if (bus->compute_params) {
1381 				ret = bus->compute_params(bus);
1382 				if (ret < 0) {
1383 					dev_err(bus->dev, "Compute params failed: %d\n",
1384 						ret);
1385 					goto restore_params;
1386 				}
1387 			}
1388 		}
1389 
1390 		/* Program params */
1391 		ret = sdw_program_params(bus, true);
1392 		if (ret < 0) {
1393 			dev_err(bus->dev, "Program params failed: %d\n", ret);
1394 			goto restore_params;
1395 		}
1396 	}
1397 
1398 	ret = do_bank_switch(stream);
1399 	if (ret < 0) {
1400 		pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1401 		goto restore_params;
1402 	}
1403 
1404 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1405 		bus = m_rt->bus;
1406 
1407 		/* Prepare port(s) on the new clock configuration */
1408 		ret = sdw_prep_deprep_ports(m_rt, true);
1409 		if (ret < 0) {
1410 			dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1411 				ret);
1412 			return ret;
1413 		}
1414 	}
1415 
1416 	stream->state = SDW_STREAM_PREPARED;
1417 
1418 	return ret;
1419 
1420 restore_params:
1421 	memcpy(&bus->params, &params, sizeof(params));
1422 	return ret;
1423 }
1424 
1425 /**
1426  * sdw_prepare_stream() - Prepare SoundWire stream
1427  *
1428  * @stream: Soundwire stream
1429  *
1430  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1431  */
sdw_prepare_stream(struct sdw_stream_runtime * stream)1432 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1433 {
1434 	bool update_params = true;
1435 	int ret;
1436 
1437 	if (!stream) {
1438 		pr_err("SoundWire: Handle not found for stream\n");
1439 		return -EINVAL;
1440 	}
1441 
1442 	sdw_acquire_bus_lock(stream);
1443 
1444 	if (stream->state == SDW_STREAM_PREPARED) {
1445 		ret = 0;
1446 		goto state_err;
1447 	}
1448 
1449 	if (stream->state != SDW_STREAM_CONFIGURED &&
1450 	    stream->state != SDW_STREAM_DEPREPARED &&
1451 	    stream->state != SDW_STREAM_DISABLED) {
1452 		pr_err("%s: %s: inconsistent state state %d\n",
1453 		       __func__, stream->name, stream->state);
1454 		ret = -EINVAL;
1455 		goto state_err;
1456 	}
1457 
1458 	/*
1459 	 * when the stream is DISABLED, this means sdw_prepare_stream()
1460 	 * is called as a result of an underflow or a resume operation.
1461 	 * In this case, the bus parameters shall not be recomputed, but
1462 	 * still need to be re-applied
1463 	 */
1464 	if (stream->state == SDW_STREAM_DISABLED)
1465 		update_params = false;
1466 
1467 	ret = _sdw_prepare_stream(stream, update_params);
1468 
1469 state_err:
1470 	sdw_release_bus_lock(stream);
1471 	return ret;
1472 }
1473 EXPORT_SYMBOL(sdw_prepare_stream);
1474 
_sdw_enable_stream(struct sdw_stream_runtime * stream)1475 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1476 {
1477 	struct sdw_master_runtime *m_rt;
1478 	struct sdw_bus *bus;
1479 	int ret;
1480 
1481 	/* Enable Master(s) and Slave(s) port(s) associated with stream */
1482 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1483 		bus = m_rt->bus;
1484 
1485 		/* Program params */
1486 		ret = sdw_program_params(bus, false);
1487 		if (ret < 0) {
1488 			dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1489 			return ret;
1490 		}
1491 
1492 		/* Enable port(s) */
1493 		ret = sdw_enable_disable_ports(m_rt, true);
1494 		if (ret < 0) {
1495 			dev_err(bus->dev,
1496 				"Enable port(s) failed ret: %d\n", ret);
1497 			return ret;
1498 		}
1499 	}
1500 
1501 	ret = do_bank_switch(stream);
1502 	if (ret < 0) {
1503 		pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1504 		return ret;
1505 	}
1506 
1507 	stream->state = SDW_STREAM_ENABLED;
1508 	return 0;
1509 }
1510 
1511 /**
1512  * sdw_enable_stream() - Enable SoundWire stream
1513  *
1514  * @stream: Soundwire stream
1515  *
1516  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1517  */
sdw_enable_stream(struct sdw_stream_runtime * stream)1518 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1519 {
1520 	int ret;
1521 
1522 	if (!stream) {
1523 		pr_err("SoundWire: Handle not found for stream\n");
1524 		return -EINVAL;
1525 	}
1526 
1527 	sdw_acquire_bus_lock(stream);
1528 
1529 	if (stream->state == SDW_STREAM_ENABLED) {
1530 		ret = 0;
1531 		goto state_err;
1532 	}
1533 
1534 	if (stream->state != SDW_STREAM_PREPARED &&
1535 	    stream->state != SDW_STREAM_DISABLED) {
1536 		pr_err("%s: %s: inconsistent state state %d\n",
1537 		       __func__, stream->name, stream->state);
1538 		ret = -EINVAL;
1539 		goto state_err;
1540 	}
1541 
1542 	ret = _sdw_enable_stream(stream);
1543 
1544 state_err:
1545 	sdw_release_bus_lock(stream);
1546 	return ret;
1547 }
1548 EXPORT_SYMBOL(sdw_enable_stream);
1549 
_sdw_disable_stream(struct sdw_stream_runtime * stream)1550 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1551 {
1552 	struct sdw_master_runtime *m_rt;
1553 	int ret;
1554 
1555 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1556 		struct sdw_bus *bus = m_rt->bus;
1557 
1558 		/* Disable port(s) */
1559 		ret = sdw_enable_disable_ports(m_rt, false);
1560 		if (ret < 0) {
1561 			dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1562 			return ret;
1563 		}
1564 	}
1565 	stream->state = SDW_STREAM_DISABLED;
1566 
1567 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1568 		struct sdw_bus *bus = m_rt->bus;
1569 
1570 		/* Program params */
1571 		ret = sdw_program_params(bus, false);
1572 		if (ret < 0) {
1573 			dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1574 			return ret;
1575 		}
1576 	}
1577 
1578 	ret = do_bank_switch(stream);
1579 	if (ret < 0) {
1580 		pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1581 		return ret;
1582 	}
1583 
1584 	/* make sure alternate bank (previous current) is also disabled */
1585 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1586 		struct sdw_bus *bus = m_rt->bus;
1587 
1588 		/* Disable port(s) */
1589 		ret = sdw_enable_disable_ports(m_rt, false);
1590 		if (ret < 0) {
1591 			dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1592 			return ret;
1593 		}
1594 	}
1595 
1596 	return 0;
1597 }
1598 
1599 /**
1600  * sdw_disable_stream() - Disable SoundWire stream
1601  *
1602  * @stream: Soundwire stream
1603  *
1604  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1605  */
sdw_disable_stream(struct sdw_stream_runtime * stream)1606 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1607 {
1608 	int ret;
1609 
1610 	if (!stream) {
1611 		pr_err("SoundWire: Handle not found for stream\n");
1612 		return -EINVAL;
1613 	}
1614 
1615 	sdw_acquire_bus_lock(stream);
1616 
1617 	if (stream->state == SDW_STREAM_DISABLED) {
1618 		ret = 0;
1619 		goto state_err;
1620 	}
1621 
1622 	if (stream->state != SDW_STREAM_ENABLED) {
1623 		pr_err("%s: %s: inconsistent state state %d\n",
1624 		       __func__, stream->name, stream->state);
1625 		ret = -EINVAL;
1626 		goto state_err;
1627 	}
1628 
1629 	ret = _sdw_disable_stream(stream);
1630 
1631 state_err:
1632 	sdw_release_bus_lock(stream);
1633 	return ret;
1634 }
1635 EXPORT_SYMBOL(sdw_disable_stream);
1636 
_sdw_deprepare_stream(struct sdw_stream_runtime * stream)1637 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1638 {
1639 	struct sdw_master_runtime *m_rt;
1640 	struct sdw_bus *bus;
1641 	int ret = 0;
1642 
1643 	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1644 		bus = m_rt->bus;
1645 		/* De-prepare port(s) */
1646 		ret = sdw_prep_deprep_ports(m_rt, false);
1647 		if (ret < 0) {
1648 			dev_err(bus->dev,
1649 				"De-prepare port(s) failed: %d\n", ret);
1650 			return ret;
1651 		}
1652 
1653 		/* TODO: Update this during Device-Device support */
1654 		bus->params.bandwidth -= m_rt->stream->params.rate *
1655 			m_rt->ch_count * m_rt->stream->params.bps;
1656 
1657 		/* Compute params */
1658 		if (bus->compute_params) {
1659 			ret = bus->compute_params(bus);
1660 			if (ret < 0) {
1661 				dev_err(bus->dev, "Compute params failed: %d\n",
1662 					ret);
1663 				return ret;
1664 			}
1665 		}
1666 
1667 		/* Program params */
1668 		ret = sdw_program_params(bus, false);
1669 		if (ret < 0) {
1670 			dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1671 			return ret;
1672 		}
1673 	}
1674 
1675 	stream->state = SDW_STREAM_DEPREPARED;
1676 	return do_bank_switch(stream);
1677 }
1678 
1679 /**
1680  * sdw_deprepare_stream() - Deprepare SoundWire stream
1681  *
1682  * @stream: Soundwire stream
1683  *
1684  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1685  */
sdw_deprepare_stream(struct sdw_stream_runtime * stream)1686 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1687 {
1688 	int ret;
1689 
1690 	if (!stream) {
1691 		pr_err("SoundWire: Handle not found for stream\n");
1692 		return -EINVAL;
1693 	}
1694 
1695 	sdw_acquire_bus_lock(stream);
1696 
1697 	if (stream->state == SDW_STREAM_DEPREPARED) {
1698 		ret = 0;
1699 		goto state_err;
1700 	}
1701 
1702 	if (stream->state != SDW_STREAM_PREPARED &&
1703 	    stream->state != SDW_STREAM_DISABLED) {
1704 		pr_err("%s: %s: inconsistent state state %d\n",
1705 		       __func__, stream->name, stream->state);
1706 		ret = -EINVAL;
1707 		goto state_err;
1708 	}
1709 
1710 	ret = _sdw_deprepare_stream(stream);
1711 
1712 state_err:
1713 	sdw_release_bus_lock(stream);
1714 	return ret;
1715 }
1716 EXPORT_SYMBOL(sdw_deprepare_stream);
1717 
set_stream(struct snd_pcm_substream * substream,struct sdw_stream_runtime * sdw_stream)1718 static int set_stream(struct snd_pcm_substream *substream,
1719 		      struct sdw_stream_runtime *sdw_stream)
1720 {
1721 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1722 	struct snd_soc_dai *dai;
1723 	int ret = 0;
1724 	int i;
1725 
1726 	/* Set stream pointer on all DAIs */
1727 	for_each_rtd_dais(rtd, i, dai) {
1728 		ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1729 		if (ret < 0) {
1730 			dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1731 			break;
1732 		}
1733 	}
1734 
1735 	return ret;
1736 }
1737 
1738 /**
1739  * sdw_alloc_stream() - Allocate and return stream runtime
1740  *
1741  * @stream_name: SoundWire stream name
1742  *
1743  * Allocates a SoundWire stream runtime instance.
1744  * sdw_alloc_stream should be called only once per stream. Typically
1745  * invoked from ALSA/ASoC machine/platform driver.
1746  */
sdw_alloc_stream(const char * stream_name)1747 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
1748 {
1749 	struct sdw_stream_runtime *stream;
1750 
1751 	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
1752 	if (!stream)
1753 		return NULL;
1754 
1755 	stream->name = stream_name;
1756 	INIT_LIST_HEAD(&stream->master_list);
1757 	stream->state = SDW_STREAM_ALLOCATED;
1758 	stream->m_rt_count = 0;
1759 
1760 	return stream;
1761 }
1762 EXPORT_SYMBOL(sdw_alloc_stream);
1763 
1764 /**
1765  * sdw_startup_stream() - Startup SoundWire stream
1766  *
1767  * @sdw_substream: Soundwire stream
1768  *
1769  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1770  */
sdw_startup_stream(void * sdw_substream)1771 int sdw_startup_stream(void *sdw_substream)
1772 {
1773 	struct snd_pcm_substream *substream = sdw_substream;
1774 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1775 	struct sdw_stream_runtime *sdw_stream;
1776 	char *name;
1777 	int ret;
1778 
1779 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1780 		name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1781 	else
1782 		name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1783 
1784 	if (!name)
1785 		return -ENOMEM;
1786 
1787 	sdw_stream = sdw_alloc_stream(name);
1788 	if (!sdw_stream) {
1789 		dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1790 		ret = -ENOMEM;
1791 		goto error;
1792 	}
1793 
1794 	ret = set_stream(substream, sdw_stream);
1795 	if (ret < 0)
1796 		goto release_stream;
1797 	return 0;
1798 
1799 release_stream:
1800 	sdw_release_stream(sdw_stream);
1801 	set_stream(substream, NULL);
1802 error:
1803 	kfree(name);
1804 	return ret;
1805 }
1806 EXPORT_SYMBOL(sdw_startup_stream);
1807 
1808 /**
1809  * sdw_shutdown_stream() - Shutdown SoundWire stream
1810  *
1811  * @sdw_substream: Soundwire stream
1812  *
1813  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1814  */
sdw_shutdown_stream(void * sdw_substream)1815 void sdw_shutdown_stream(void *sdw_substream)
1816 {
1817 	struct snd_pcm_substream *substream = sdw_substream;
1818 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1819 	struct sdw_stream_runtime *sdw_stream;
1820 	struct snd_soc_dai *dai;
1821 
1822 	/* Find stream from first CPU DAI */
1823 	dai = asoc_rtd_to_cpu(rtd, 0);
1824 
1825 	sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1826 
1827 	if (IS_ERR(sdw_stream)) {
1828 		dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1829 		return;
1830 	}
1831 
1832 	/* release memory */
1833 	kfree(sdw_stream->name);
1834 	sdw_release_stream(sdw_stream);
1835 
1836 	/* clear DAI data */
1837 	set_stream(substream, NULL);
1838 }
1839 EXPORT_SYMBOL(sdw_shutdown_stream);
1840 
1841 /**
1842  * sdw_release_stream() - Free the assigned stream runtime
1843  *
1844  * @stream: SoundWire stream runtime
1845  *
1846  * sdw_release_stream should be called only once per stream
1847  */
sdw_release_stream(struct sdw_stream_runtime * stream)1848 void sdw_release_stream(struct sdw_stream_runtime *stream)
1849 {
1850 	kfree(stream);
1851 }
1852 EXPORT_SYMBOL(sdw_release_stream);
1853 
1854 /**
1855  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1856  *
1857  * @bus: SDW Bus instance
1858  * @stream_config: Stream configuration for audio stream
1859  * @port_config: Port configuration for audio stream
1860  * @num_ports: Number of ports
1861  * @stream: SoundWire stream
1862  */
sdw_stream_add_master(struct sdw_bus * bus,struct sdw_stream_config * stream_config,struct sdw_port_config * port_config,unsigned int num_ports,struct sdw_stream_runtime * stream)1863 int sdw_stream_add_master(struct sdw_bus *bus,
1864 			  struct sdw_stream_config *stream_config,
1865 			  struct sdw_port_config *port_config,
1866 			  unsigned int num_ports,
1867 			  struct sdw_stream_runtime *stream)
1868 {
1869 	struct sdw_master_runtime *m_rt;
1870 	bool alloc_master_rt = false;
1871 	int ret;
1872 
1873 	mutex_lock(&bus->bus_lock);
1874 
1875 	/*
1876 	 * For multi link streams, add the second master only if
1877 	 * the bus supports it.
1878 	 * Check if bus->multi_link is set
1879 	 */
1880 	if (!bus->multi_link && stream->m_rt_count > 0) {
1881 		dev_err(bus->dev,
1882 			"Multilink not supported, link %d\n", bus->link_id);
1883 		ret = -EINVAL;
1884 		goto unlock;
1885 	}
1886 
1887 	/*
1888 	 * check if Master is already allocated (e.g. as a result of Slave adding
1889 	 * it first), if so skip allocation and go to configuration
1890 	 */
1891 	m_rt = sdw_master_rt_find(bus, stream);
1892 	if (!m_rt) {
1893 		m_rt = sdw_master_rt_alloc(bus, stream);
1894 		if (!m_rt) {
1895 			dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
1896 				__func__, stream->name);
1897 			ret = -ENOMEM;
1898 			goto unlock;
1899 		}
1900 
1901 		alloc_master_rt = true;
1902 	}
1903 
1904 	if (!sdw_master_port_allocated(m_rt)) {
1905 		ret = sdw_master_port_alloc(m_rt, num_ports);
1906 		if (ret)
1907 			goto alloc_error;
1908 
1909 		stream->m_rt_count++;
1910 	}
1911 
1912 	ret = sdw_master_rt_config(m_rt, stream_config);
1913 	if (ret < 0)
1914 		goto unlock;
1915 
1916 	ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1917 	if (ret)
1918 		goto unlock;
1919 
1920 	ret = sdw_master_port_config(m_rt, port_config);
1921 
1922 	goto unlock;
1923 
1924 alloc_error:
1925 	/*
1926 	 * we only cleanup what was allocated in this routine
1927 	 */
1928 	if (alloc_master_rt)
1929 		sdw_master_rt_free(m_rt, stream);
1930 unlock:
1931 	mutex_unlock(&bus->bus_lock);
1932 	return ret;
1933 }
1934 EXPORT_SYMBOL(sdw_stream_add_master);
1935 
1936 /**
1937  * sdw_stream_remove_master() - Remove master from sdw_stream
1938  *
1939  * @bus: SDW Bus instance
1940  * @stream: SoundWire stream
1941  *
1942  * This removes and frees port_rt and master_rt from a stream
1943  */
sdw_stream_remove_master(struct sdw_bus * bus,struct sdw_stream_runtime * stream)1944 int sdw_stream_remove_master(struct sdw_bus *bus,
1945 			     struct sdw_stream_runtime *stream)
1946 {
1947 	struct sdw_master_runtime *m_rt, *_m_rt;
1948 
1949 	mutex_lock(&bus->bus_lock);
1950 
1951 	list_for_each_entry_safe(m_rt, _m_rt,
1952 				 &stream->master_list, stream_node) {
1953 		if (m_rt->bus != bus)
1954 			continue;
1955 
1956 		sdw_master_port_free(m_rt);
1957 		sdw_master_rt_free(m_rt, stream);
1958 		stream->m_rt_count--;
1959 	}
1960 
1961 	if (list_empty(&stream->master_list))
1962 		stream->state = SDW_STREAM_RELEASED;
1963 
1964 	mutex_unlock(&bus->bus_lock);
1965 
1966 	return 0;
1967 }
1968 EXPORT_SYMBOL(sdw_stream_remove_master);
1969 
1970 /**
1971  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1972  *
1973  * @slave: SDW Slave instance
1974  * @stream_config: Stream configuration for audio stream
1975  * @stream: SoundWire stream
1976  * @port_config: Port configuration for audio stream
1977  * @num_ports: Number of ports
1978  *
1979  * It is expected that Slave is added before adding Master
1980  * to the Stream.
1981  *
1982  */
sdw_stream_add_slave(struct sdw_slave * slave,struct sdw_stream_config * stream_config,struct sdw_port_config * port_config,unsigned int num_ports,struct sdw_stream_runtime * stream)1983 int sdw_stream_add_slave(struct sdw_slave *slave,
1984 			 struct sdw_stream_config *stream_config,
1985 			 struct sdw_port_config *port_config,
1986 			 unsigned int num_ports,
1987 			 struct sdw_stream_runtime *stream)
1988 {
1989 	struct sdw_slave_runtime *s_rt;
1990 	struct sdw_master_runtime *m_rt;
1991 	bool alloc_master_rt = false;
1992 	bool alloc_slave_rt = false;
1993 
1994 	int ret;
1995 
1996 	mutex_lock(&slave->bus->bus_lock);
1997 
1998 	/*
1999 	 * check if Master is already allocated, if so skip allocation
2000 	 * and go to configuration
2001 	 */
2002 	m_rt = sdw_master_rt_find(slave->bus, stream);
2003 	if (!m_rt) {
2004 		/*
2005 		 * If this API is invoked by Slave first then m_rt is not valid.
2006 		 * So, allocate m_rt and add Slave to it.
2007 		 */
2008 		m_rt = sdw_master_rt_alloc(slave->bus, stream);
2009 		if (!m_rt) {
2010 			dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
2011 				__func__, stream->name);
2012 			ret = -ENOMEM;
2013 			goto unlock;
2014 		}
2015 
2016 		alloc_master_rt = true;
2017 	}
2018 
2019 	s_rt = sdw_slave_rt_find(slave, stream);
2020 	if (!s_rt) {
2021 		s_rt = sdw_slave_rt_alloc(slave, m_rt);
2022 		if (!s_rt) {
2023 			dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n",
2024 				stream->name);
2025 			ret = -ENOMEM;
2026 			goto alloc_error;
2027 		}
2028 
2029 		alloc_slave_rt = true;
2030 	}
2031 
2032 	if (!sdw_slave_port_allocated(s_rt)) {
2033 		ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
2034 		if (ret)
2035 			goto alloc_error;
2036 	}
2037 
2038 	ret =  sdw_master_rt_config(m_rt, stream_config);
2039 	if (ret)
2040 		goto unlock;
2041 
2042 	ret = sdw_slave_rt_config(s_rt, stream_config);
2043 	if (ret)
2044 		goto unlock;
2045 
2046 	ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
2047 	if (ret)
2048 		goto unlock;
2049 
2050 	ret = sdw_slave_port_config(slave, s_rt, port_config);
2051 	if (ret)
2052 		goto unlock;
2053 
2054 	/*
2055 	 * Change stream state to CONFIGURED on first Slave add.
2056 	 * Bus is not aware of number of Slave(s) in a stream at this
2057 	 * point so cannot depend on all Slave(s) to be added in order to
2058 	 * change stream state to CONFIGURED.
2059 	 */
2060 	stream->state = SDW_STREAM_CONFIGURED;
2061 	goto unlock;
2062 
2063 alloc_error:
2064 	/*
2065 	 * we only cleanup what was allocated in this routine. The 'else if'
2066 	 * is intentional, the 'master_rt_free' will call sdw_slave_rt_free()
2067 	 * internally.
2068 	 */
2069 	if (alloc_master_rt)
2070 		sdw_master_rt_free(m_rt, stream);
2071 	else if (alloc_slave_rt)
2072 		sdw_slave_rt_free(slave, stream);
2073 unlock:
2074 	mutex_unlock(&slave->bus->bus_lock);
2075 	return ret;
2076 }
2077 EXPORT_SYMBOL(sdw_stream_add_slave);
2078 
2079 /**
2080  * sdw_stream_remove_slave() - Remove slave from sdw_stream
2081  *
2082  * @slave: SDW Slave instance
2083  * @stream: SoundWire stream
2084  *
2085  * This removes and frees port_rt and slave_rt from a stream
2086  */
sdw_stream_remove_slave(struct sdw_slave * slave,struct sdw_stream_runtime * stream)2087 int sdw_stream_remove_slave(struct sdw_slave *slave,
2088 			    struct sdw_stream_runtime *stream)
2089 {
2090 	mutex_lock(&slave->bus->bus_lock);
2091 
2092 	sdw_slave_port_free(slave, stream);
2093 	sdw_slave_rt_free(slave, stream);
2094 
2095 	mutex_unlock(&slave->bus->bus_lock);
2096 
2097 	return 0;
2098 }
2099 EXPORT_SYMBOL(sdw_stream_remove_slave);
2100