1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-18 Intel Corporation.
5 * stream.c - SoundWire Bus stream operations.
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>
21 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
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.
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);
31 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
32 EXPORT_SYMBOL(sdw_cols);
34 int sdw_find_col_index(int col)
38 for (i = 0; i < SDW_FRAME_COLS; i++) {
39 if (sdw_cols[i] == col)
43 pr_warn("Requested column not found, selecting lowest column no: 2\n");
46 EXPORT_SYMBOL(sdw_find_col_index);
48 int sdw_find_row_index(int row)
52 for (i = 0; i < SDW_FRAME_ROWS; i++) {
53 if (sdw_rows[i] == row)
57 pr_warn("Requested row not found, selecting lowest row no: 48\n");
60 EXPORT_SYMBOL(sdw_find_row_index);
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)
67 u32 addr1, addr2, addr3, addr4;
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);
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);
83 /* Program DPN_OffsetCtrl2 registers */
84 ret = sdw_write_no_pm(slave, addr1, t_params->offset2);
86 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
90 /* Program DPN_BlockCtrl3 register */
91 ret = sdw_write_no_pm(slave, addr2, t_params->blk_pkg_mode);
93 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
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
102 if (type != SDW_DPN_FULL)
105 /* Program DPN_SampleCtrl2 register */
106 wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
108 ret = sdw_write_no_pm(slave, addr3, wbuf);
110 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
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);
118 ret = sdw_write_no_pm(slave, addr4, wbuf);
120 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
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)
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;
137 if (s_rt->slave->is_mockup_device)
140 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
146 addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
147 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
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);
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);
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);
166 ret = sdw_update_no_pm(s_rt->slave, addr1, 0xF, wbuf);
168 dev_err(&s_rt->slave->dev,
169 "DPN_PortCtrl register write failed for port %d\n",
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));
178 dev_err(&s_rt->slave->dev,
179 "DPN_BlockCtrl1 register write failed for port %d\n",
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);
189 dev_err(&s_rt->slave->dev,
190 "DPN_SampleCtrl1 register write failed for port %d\n",
195 /* Program DPN_OffsetCtrl1 registers */
196 ret = sdw_write_no_pm(s_rt->slave, addr4, t_params->offset1);
198 dev_err(&s_rt->slave->dev,
199 "DPN_OffsetCtrl1 register write failed for port %d\n",
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);
208 dev_err(&s_rt->slave->dev,
209 "DPN_BlockCtrl2 reg write failed for port %d\n",
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);
219 dev_err(&s_rt->slave->dev,
220 "DPN_LaneCtrl register write failed for port %d\n",
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);
230 dev_err(&s_rt->slave->dev,
231 "Transport reg write failed for port: %d\n",
238 static int sdw_program_master_port_params(struct sdw_bus *bus,
239 struct sdw_port_runtime *p_rt)
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
249 ret = bus->port_ops->dpn_set_port_transport_params(bus,
250 &p_rt->transport_params,
251 bus->params.next_bank);
255 return bus->port_ops->dpn_set_port_params(bus,
257 bus->params.next_bank);
261 * sdw_program_port_params() - Programs transport parameters of Master(s)
264 * @m_rt: Master stream runtime
266 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
268 struct sdw_slave_runtime *s_rt;
269 struct sdw_bus *bus = m_rt->bus;
270 struct sdw_port_runtime *p_rt;
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);
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);
293 * sdw_enable_disable_slave_ports: Enable/disable slave data port
296 * @s_rt: slave runtime
297 * @p_rt: port runtime
298 * @en: enable or disable operation
300 * This function only sets the enable/disable bits in the relevant bank, the
301 * actual enable/disable is done with a bank switch
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,
308 struct sdw_transport_params *t_params = &p_rt->transport_params;
312 if (bus->params.next_bank)
313 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
315 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
318 * Since bus doesn't support sharing a port across two streams,
319 * it is safe to reset this register
322 ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
324 ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
327 dev_err(&s_rt->slave->dev,
328 "Slave chn_en reg write failed:%d port:%d\n",
329 ret, t_params->port_num);
334 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
335 struct sdw_port_runtime *p_rt,
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;
343 enable_ch.port_num = p_rt->num;
344 enable_ch.ch_mask = p_rt->ch_mask;
345 enable_ch.enable = en;
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,
351 bus->params.next_bank);
354 "Master chn_en write failed:%d port:%d\n",
355 ret, t_params->port_num);
360 "dpn_port_enable_ch not supported, %s failed\n",
361 en ? "enable" : "disable");
369 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
372 * @m_rt: Master stream runtime
373 * @en: mode (enable/disable)
375 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
377 struct sdw_port_runtime *s_port, *m_port;
378 struct sdw_slave_runtime *s_rt;
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,
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);
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)
406 struct sdw_slave *slave = s_rt->slave;
408 mutex_lock(&slave->sdw_dev_lock);
411 struct device *dev = &slave->dev;
412 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
414 if (drv->ops && drv->ops->port_prep) {
415 ret = drv->ops->port_prep(slave, &prep_ch, cmd);
417 dev_err(dev, "Slave Port Prep cmd %d failed: %d\n",
422 mutex_unlock(&slave->sdw_dev_lock);
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,
432 struct completion *port_ready;
433 struct sdw_dpn_prop *dpn_prop;
434 struct sdw_prepare_ch prep_ch;
439 prep_ch.num = p_rt->num;
440 prep_ch.ch_mask = p_rt->ch_mask;
442 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
447 "Slave Port:%d properties not found\n", prep_ch.num);
451 prep_ch.prepare = prep;
453 prep_ch.bank = bus->params.next_bank;
455 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
456 bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
460 * Enable interrupt before Port prepare.
461 * For Port de-prepare, it is assumed that port
462 * was prepared earlier
465 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
466 dpn_prop->imp_def_interrupts);
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);
474 /* Prepare Slave port implementing CP_SM */
475 if (!dpn_prop->simple_ch_prep_sm) {
476 addr = SDW_DPN_PREPARECTRL(p_rt->num);
479 ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
481 ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
484 dev_err(&s_rt->slave->dev,
485 "Slave prep_ctrl reg write failed\n");
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));
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);
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);
506 /* Disable interrupt after Port de-prepare */
508 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
509 dpn_prop->imp_def_interrupts);
514 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
515 struct sdw_port_runtime *p_rt,
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;
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;
529 /* Pre-prepare/Pre-deprepare port(s) */
530 if (ops->dpn_port_prep) {
531 ret = ops->dpn_port_prep(bus, &prep_ch);
533 dev_err(bus->dev, "Port prepare failed for port:%d\n",
543 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
546 * @m_rt: Master runtime handle
547 * @prep: Prepare or De-prepare
549 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
551 struct sdw_slave_runtime *s_rt;
552 struct sdw_port_runtime *p_rt;
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,
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);
576 * sdw_notify_config() - Notify bus configuration
578 * @m_rt: Master runtime handle
580 * This function notifies the Master(s) and Slave(s) of the
581 * new bus configuration.
583 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
585 struct sdw_slave_runtime *s_rt;
586 struct sdw_bus *bus = m_rt->bus;
587 struct sdw_slave *slave;
590 if (bus->ops->set_bus_conf) {
591 ret = bus->ops->set_bus_conf(bus, &bus->params);
596 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
599 mutex_lock(&slave->sdw_dev_lock);
602 struct device *dev = &slave->dev;
603 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
605 if (drv->ops && drv->ops->bus_config) {
606 ret = drv->ops->bus_config(slave, &bus->params);
608 dev_err(dev, "Notify Slave: %d failed\n",
610 mutex_unlock(&slave->sdw_dev_lock);
616 mutex_unlock(&slave->sdw_dev_lock);
623 * sdw_program_params() - Program transport and port parameters for Master(s)
626 * @bus: SDW bus instance
627 * @prepare: true if sdw_program_params() is called by _prepare.
629 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
631 struct sdw_master_runtime *m_rt;
634 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
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.
643 m_rt->stream->state == SDW_STREAM_CONFIGURED)
646 ret = sdw_program_port_params(m_rt);
649 "Program transport params failed: %d\n", ret);
653 ret = sdw_notify_config(m_rt);
656 "Notify bus config failed: %d\n", ret);
660 /* Enable port(s) on alternate bank for all active streams */
661 if (m_rt->stream->state != SDW_STREAM_ENABLED)
664 ret = sdw_enable_disable_ports(m_rt, true);
666 dev_err(bus->dev, "Enable channel failed: %d\n", ret);
674 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
676 int col_index, row_index;
678 struct sdw_msg *wr_msg;
683 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
687 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
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);
698 if (bus->params.next_bank)
699 addr = SDW_SCP_FRAMECTRL_B1;
701 addr = SDW_SCP_FRAMECTRL_B0;
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;
708 * Set the multi_link flag only when both the hardware supports
709 * and hardware-based sync is required
711 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
714 ret = sdw_transfer_defer(bus, wr_msg);
716 ret = sdw_transfer(bus, wr_msg);
718 if (ret < 0 && ret != -ENODATA) {
719 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
726 bus->defer_msg.msg = NULL;
727 bus->params.curr_bank = !bus->params.curr_bank;
728 bus->params.next_bank = !bus->params.next_bank;
737 bus->defer_msg.msg = NULL;
742 * sdw_ml_sync_bank_switch: Multilink register bank switch
744 * @bus: SDW bus instance
745 * @multi_link: whether this is a multi-link stream with hardware-based sync
747 * Caller function should free the buffers on error
749 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus, bool multi_link)
751 unsigned long time_left;
756 /* Wait for completion of transfer */
757 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
758 bus->bank_switch_timeout);
761 dev_err(bus->dev, "Controller Timed out on bank switch\n");
765 bus->params.curr_bank = !bus->params.curr_bank;
766 bus->params.next_bank = !bus->params.next_bank;
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;
777 static int do_bank_switch(struct sdw_stream_runtime *stream)
779 struct sdw_master_runtime *m_rt;
780 const struct sdw_master_ops *ops;
782 bool multi_link = false;
786 m_rt_count = stream->m_rt_count;
788 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
792 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
794 mutex_lock(&bus->msg_lock);
797 /* Pre-bank switch */
798 if (ops->pre_bank_switch) {
799 ret = ops->pre_bank_switch(bus);
802 "Pre bank switch op failed: %d\n", ret);
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.
813 ret = sdw_bank_switch(bus, m_rt_count);
815 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
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
826 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
830 /* Post-bank switch */
831 if (ops->post_bank_switch) {
832 ret = ops->post_bank_switch(bus);
835 "Post bank switch op failed: %d\n",
839 } else if (multi_link) {
841 "Post bank switch ops not implemented\n");
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;
850 /* Check if bank switch was successful */
851 ret = sdw_ml_sync_bank_switch(bus, multi_link);
854 "multi link bank switch failed: %d\n", ret);
859 mutex_unlock(&bus->msg_lock);
865 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
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;
877 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
879 if (mutex_is_locked(&bus->msg_lock))
880 mutex_unlock(&bus->msg_lock);
887 static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
889 struct sdw_port_runtime *p_rt;
891 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
895 list_add_tail(&p_rt->port_node, port_list);
900 static int sdw_port_config(struct sdw_port_runtime *p_rt,
901 const struct sdw_port_config *port_config,
904 p_rt->ch_mask = port_config[port_index].ch_mask;
905 p_rt->num = port_config[port_index].num;
908 * TODO: Check port capabilities for requested configuration
914 static void sdw_port_free(struct sdw_port_runtime *p_rt)
916 list_del(&p_rt->port_node);
920 static bool sdw_slave_port_allocated(struct sdw_slave_runtime *s_rt)
922 return !list_empty(&s_rt->port_list);
925 static void sdw_slave_port_free(struct sdw_slave *slave,
926 struct sdw_stream_runtime *stream)
928 struct sdw_port_runtime *p_rt, *_p_rt;
929 struct sdw_master_runtime *m_rt;
930 struct sdw_slave_runtime *s_rt;
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)
937 list_for_each_entry_safe(p_rt, _p_rt,
938 &s_rt->port_list, port_node) {
945 static int sdw_slave_port_alloc(struct sdw_slave *slave,
946 struct sdw_slave_runtime *s_rt,
947 unsigned int num_config)
949 struct sdw_port_runtime *p_rt;
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);
962 static int sdw_slave_port_is_valid_range(struct device *dev, int num)
964 if (!SDW_VALID_PORT_RANGE(num)) {
965 dev_err(dev, "SoundWire: Invalid port number :%d\n", num);
972 static int sdw_slave_port_config(struct sdw_slave *slave,
973 struct sdw_slave_runtime *s_rt,
974 const struct sdw_port_config *port_config)
976 struct sdw_port_runtime *p_rt;
981 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
983 * TODO: Check valid port range as defined by DisCo/
986 ret = sdw_slave_port_is_valid_range(&slave->dev, port_config[i].num);
990 ret = sdw_port_config(p_rt, port_config, i);
999 static bool sdw_master_port_allocated(struct sdw_master_runtime *m_rt)
1001 return !list_empty(&m_rt->port_list);
1004 static void sdw_master_port_free(struct sdw_master_runtime *m_rt)
1006 struct sdw_port_runtime *p_rt, *_p_rt;
1008 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1009 sdw_port_free(p_rt);
1013 static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
1014 unsigned int num_ports)
1016 struct sdw_port_runtime *p_rt;
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);
1029 static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
1030 const struct sdw_port_config *port_config)
1032 struct sdw_port_runtime *p_rt;
1037 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
1038 ret = sdw_port_config(p_rt, port_config, i);
1048 * sdw_slave_rt_alloc() - Allocate a Slave runtime handle.
1050 * @slave: Slave handle
1051 * @m_rt: Master runtime handle
1053 * This function is to be called with bus_lock held.
1055 static struct sdw_slave_runtime
1056 *sdw_slave_rt_alloc(struct sdw_slave *slave,
1057 struct sdw_master_runtime *m_rt)
1059 struct sdw_slave_runtime *s_rt;
1061 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1065 INIT_LIST_HEAD(&s_rt->port_list);
1066 s_rt->slave = slave;
1068 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1074 * sdw_slave_rt_config() - Configure a Slave runtime handle.
1076 * @s_rt: Slave runtime handle
1077 * @stream_config: Stream configuration
1079 * This function is to be called with bus_lock held.
1081 static int sdw_slave_rt_config(struct sdw_slave_runtime *s_rt,
1082 struct sdw_stream_config *stream_config)
1084 s_rt->ch_count = stream_config->ch_count;
1085 s_rt->direction = stream_config->direction;
1090 static struct sdw_slave_runtime *sdw_slave_rt_find(struct sdw_slave *slave,
1091 struct sdw_stream_runtime *stream)
1093 struct sdw_slave_runtime *s_rt, *_s_rt;
1094 struct sdw_master_runtime *m_rt;
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)
1108 * sdw_slave_rt_free() - Free Slave(s) runtime handle
1110 * @slave: Slave handle.
1111 * @stream: Stream runtime handle.
1113 * This function is to be called with bus_lock held.
1115 static void sdw_slave_rt_free(struct sdw_slave *slave,
1116 struct sdw_stream_runtime *stream)
1118 struct sdw_slave_runtime *s_rt;
1120 s_rt = sdw_slave_rt_find(slave, stream);
1122 list_del(&s_rt->m_rt_node);
1127 static struct sdw_master_runtime
1128 *sdw_master_rt_find(struct sdw_bus *bus,
1129 struct sdw_stream_runtime *stream)
1131 struct sdw_master_runtime *m_rt;
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)
1143 * sdw_master_rt_alloc() - Allocates a Master runtime handle
1145 * @bus: SDW bus instance
1146 * @stream: Stream runtime handle.
1148 * This function is to be called with bus_lock held.
1150 static struct sdw_master_runtime
1151 *sdw_master_rt_alloc(struct sdw_bus *bus,
1152 struct sdw_stream_runtime *stream)
1154 struct sdw_master_runtime *m_rt, *walk_m_rt;
1155 struct list_head *insert_after;
1157 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
1161 /* Initialization of Master runtime handle */
1162 INIT_LIST_HEAD(&m_rt->port_list);
1163 INIT_LIST_HEAD(&m_rt->slave_rt_list);
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.
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;
1177 list_add(&m_rt->stream_node, insert_after);
1179 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
1182 m_rt->stream = stream;
1188 * sdw_master_rt_config() - Configure Master runtime handle
1190 * @m_rt: Master runtime handle
1191 * @stream_config: Stream configuration
1193 * This function is to be called with bus_lock held.
1196 static int sdw_master_rt_config(struct sdw_master_runtime *m_rt,
1197 struct sdw_stream_config *stream_config)
1199 m_rt->ch_count = stream_config->ch_count;
1200 m_rt->direction = stream_config->direction;
1206 * sdw_master_rt_free() - Free Master runtime handle
1208 * @m_rt: Master runtime node
1209 * @stream: Stream runtime handle.
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.
1216 static void sdw_master_rt_free(struct sdw_master_runtime *m_rt,
1217 struct sdw_stream_runtime *stream)
1219 struct sdw_slave_runtime *s_rt, *_s_rt;
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);
1226 list_del(&m_rt->stream_node);
1227 list_del(&m_rt->bus_node);
1232 * sdw_config_stream() - Configure the allocated stream
1235 * @stream: SoundWire stream
1236 * @stream_config: Stream configuration for audio stream
1237 * @is_slave: is API called from Slave or Master
1239 * This function is to be called with bus_lock held.
1241 static int sdw_config_stream(struct device *dev,
1242 struct sdw_stream_runtime *stream,
1243 struct sdw_stream_config *stream_config,
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.
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
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);
1260 if (stream->params.bps &&
1261 stream->params.bps != stream_config->bps) {
1262 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1266 stream->type = stream_config->type;
1267 stream->params.rate = stream_config->frame_rate;
1268 stream->params.bps = stream_config->bps;
1270 /* TODO: Update this check during Device-device support */
1272 stream->params.ch_count += stream_config->ch_count;
1278 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1280 * @slave: Slave handle
1281 * @direction: Data direction.
1282 * @port_num: Port number
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)
1288 struct sdw_dpn_prop *dpn_prop;
1292 if (direction == SDW_DATA_DIR_TX) {
1293 num_ports = hweight32(slave->prop.source_ports);
1294 dpn_prop = slave->prop.src_dpn_prop;
1296 num_ports = hweight32(slave->prop.sink_ports);
1297 dpn_prop = slave->prop.sink_dpn_prop;
1300 for (i = 0; i < num_ports; i++) {
1301 if (dpn_prop[i].num == port_num)
1302 return &dpn_prop[i];
1309 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1311 * @stream: SoundWire stream
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.
1318 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1320 struct sdw_master_runtime *m_rt;
1321 struct sdw_bus *bus;
1323 /* Iterate for all Master(s) in Master list */
1324 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1327 mutex_lock(&bus->bus_lock);
1332 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1334 * @stream: SoundWire stream
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.
1340 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1342 struct sdw_master_runtime *m_rt;
1343 struct sdw_bus *bus;
1345 /* Iterate for all Master(s) in Master list */
1346 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1348 mutex_unlock(&bus->bus_lock);
1352 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1355 struct sdw_master_runtime *m_rt;
1356 struct sdw_bus *bus;
1357 struct sdw_master_prop *prop;
1358 struct sdw_bus_params params;
1361 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1362 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1365 memcpy(¶ms, &bus->params, sizeof(params));
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");
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;
1379 /* Compute params */
1380 if (bus->compute_params) {
1381 ret = bus->compute_params(bus);
1383 dev_err(bus->dev, "Compute params failed: %d\n",
1385 goto restore_params;
1390 /* Program params */
1391 ret = sdw_program_params(bus, true);
1393 dev_err(bus->dev, "Program params failed: %d\n", ret);
1394 goto restore_params;
1398 ret = do_bank_switch(stream);
1400 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1401 goto restore_params;
1404 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1407 /* Prepare port(s) on the new clock configuration */
1408 ret = sdw_prep_deprep_ports(m_rt, true);
1410 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1416 stream->state = SDW_STREAM_PREPARED;
1421 memcpy(&bus->params, ¶ms, sizeof(params));
1426 * sdw_prepare_stream() - Prepare SoundWire stream
1428 * @stream: Soundwire stream
1430 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1432 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1434 bool update_params = true;
1438 pr_err("SoundWire: Handle not found for stream\n");
1442 sdw_acquire_bus_lock(stream);
1444 if (stream->state == SDW_STREAM_PREPARED) {
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);
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
1464 if (stream->state == SDW_STREAM_DISABLED)
1465 update_params = false;
1467 ret = _sdw_prepare_stream(stream, update_params);
1470 sdw_release_bus_lock(stream);
1473 EXPORT_SYMBOL(sdw_prepare_stream);
1475 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1477 struct sdw_master_runtime *m_rt;
1478 struct sdw_bus *bus;
1481 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1482 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1485 /* Program params */
1486 ret = sdw_program_params(bus, false);
1488 dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1492 /* Enable port(s) */
1493 ret = sdw_enable_disable_ports(m_rt, true);
1496 "Enable port(s) failed ret: %d\n", ret);
1501 ret = do_bank_switch(stream);
1503 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
1507 stream->state = SDW_STREAM_ENABLED;
1512 * sdw_enable_stream() - Enable SoundWire stream
1514 * @stream: Soundwire stream
1516 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1518 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1523 pr_err("SoundWire: Handle not found for stream\n");
1527 sdw_acquire_bus_lock(stream);
1529 if (stream->state == SDW_STREAM_ENABLED) {
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);
1542 ret = _sdw_enable_stream(stream);
1545 sdw_release_bus_lock(stream);
1548 EXPORT_SYMBOL(sdw_enable_stream);
1550 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1552 struct sdw_master_runtime *m_rt;
1555 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1556 struct sdw_bus *bus = m_rt->bus;
1558 /* Disable port(s) */
1559 ret = sdw_enable_disable_ports(m_rt, false);
1561 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1565 stream->state = SDW_STREAM_DISABLED;
1567 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1568 struct sdw_bus *bus = m_rt->bus;
1570 /* Program params */
1571 ret = sdw_program_params(bus, false);
1573 dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1578 ret = do_bank_switch(stream);
1580 pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
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;
1588 /* Disable port(s) */
1589 ret = sdw_enable_disable_ports(m_rt, false);
1591 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1600 * sdw_disable_stream() - Disable SoundWire stream
1602 * @stream: Soundwire stream
1604 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1606 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1611 pr_err("SoundWire: Handle not found for stream\n");
1615 sdw_acquire_bus_lock(stream);
1617 if (stream->state == SDW_STREAM_DISABLED) {
1622 if (stream->state != SDW_STREAM_ENABLED) {
1623 pr_err("%s: %s: inconsistent state state %d\n",
1624 __func__, stream->name, stream->state);
1629 ret = _sdw_disable_stream(stream);
1632 sdw_release_bus_lock(stream);
1635 EXPORT_SYMBOL(sdw_disable_stream);
1637 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1639 struct sdw_master_runtime *m_rt;
1640 struct sdw_bus *bus;
1643 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1645 /* De-prepare port(s) */
1646 ret = sdw_prep_deprep_ports(m_rt, false);
1649 "De-prepare port(s) failed: %d\n", ret);
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;
1657 /* Compute params */
1658 if (bus->compute_params) {
1659 ret = bus->compute_params(bus);
1661 dev_err(bus->dev, "Compute params failed: %d\n",
1667 /* Program params */
1668 ret = sdw_program_params(bus, false);
1670 dev_err(bus->dev, "%s: Program params failed: %d\n", __func__, ret);
1675 stream->state = SDW_STREAM_DEPREPARED;
1676 return do_bank_switch(stream);
1680 * sdw_deprepare_stream() - Deprepare SoundWire stream
1682 * @stream: Soundwire stream
1684 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1686 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1691 pr_err("SoundWire: Handle not found for stream\n");
1695 sdw_acquire_bus_lock(stream);
1697 if (stream->state == SDW_STREAM_DEPREPARED) {
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);
1710 ret = _sdw_deprepare_stream(stream);
1713 sdw_release_bus_lock(stream);
1716 EXPORT_SYMBOL(sdw_deprepare_stream);
1718 static int set_stream(struct snd_pcm_substream *substream,
1719 struct sdw_stream_runtime *sdw_stream)
1721 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1722 struct snd_soc_dai *dai;
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);
1730 dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1739 * sdw_alloc_stream() - Allocate and return stream runtime
1741 * @stream_name: SoundWire stream name
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.
1747 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
1749 struct sdw_stream_runtime *stream;
1751 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
1755 stream->name = stream_name;
1756 INIT_LIST_HEAD(&stream->master_list);
1757 stream->state = SDW_STREAM_ALLOCATED;
1758 stream->m_rt_count = 0;
1762 EXPORT_SYMBOL(sdw_alloc_stream);
1765 * sdw_startup_stream() - Startup SoundWire stream
1767 * @sdw_substream: Soundwire stream
1769 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1771 int sdw_startup_stream(void *sdw_substream)
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;
1779 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1780 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1782 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1787 sdw_stream = sdw_alloc_stream(name);
1789 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1794 ret = set_stream(substream, sdw_stream);
1796 goto release_stream;
1800 sdw_release_stream(sdw_stream);
1801 set_stream(substream, NULL);
1806 EXPORT_SYMBOL(sdw_startup_stream);
1809 * sdw_shutdown_stream() - Shutdown SoundWire stream
1811 * @sdw_substream: Soundwire stream
1813 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1815 void sdw_shutdown_stream(void *sdw_substream)
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;
1822 /* Find stream from first CPU DAI */
1823 dai = snd_soc_rtd_to_cpu(rtd, 0);
1825 sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1827 if (IS_ERR(sdw_stream)) {
1828 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1832 /* release memory */
1833 kfree(sdw_stream->name);
1834 sdw_release_stream(sdw_stream);
1836 /* clear DAI data */
1837 set_stream(substream, NULL);
1839 EXPORT_SYMBOL(sdw_shutdown_stream);
1842 * sdw_release_stream() - Free the assigned stream runtime
1844 * @stream: SoundWire stream runtime
1846 * sdw_release_stream should be called only once per stream
1848 void sdw_release_stream(struct sdw_stream_runtime *stream)
1852 EXPORT_SYMBOL(sdw_release_stream);
1855 * sdw_stream_add_master() - Allocate and add master runtime to a stream
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
1863 int sdw_stream_add_master(struct sdw_bus *bus,
1864 struct sdw_stream_config *stream_config,
1865 const struct sdw_port_config *port_config,
1866 unsigned int num_ports,
1867 struct sdw_stream_runtime *stream)
1869 struct sdw_master_runtime *m_rt;
1870 bool alloc_master_rt = false;
1873 mutex_lock(&bus->bus_lock);
1876 * For multi link streams, add the second master only if
1877 * the bus supports it.
1878 * Check if bus->multi_link is set
1880 if (!bus->multi_link && stream->m_rt_count > 0) {
1882 "Multilink not supported, link %d\n", bus->link_id);
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
1891 m_rt = sdw_master_rt_find(bus, stream);
1893 m_rt = sdw_master_rt_alloc(bus, stream);
1895 dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
1896 __func__, stream->name);
1901 alloc_master_rt = true;
1904 if (!sdw_master_port_allocated(m_rt)) {
1905 ret = sdw_master_port_alloc(m_rt, num_ports);
1909 stream->m_rt_count++;
1912 ret = sdw_master_rt_config(m_rt, stream_config);
1916 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1920 ret = sdw_master_port_config(m_rt, port_config);
1926 * we only cleanup what was allocated in this routine
1928 if (alloc_master_rt)
1929 sdw_master_rt_free(m_rt, stream);
1931 mutex_unlock(&bus->bus_lock);
1934 EXPORT_SYMBOL(sdw_stream_add_master);
1937 * sdw_stream_remove_master() - Remove master from sdw_stream
1939 * @bus: SDW Bus instance
1940 * @stream: SoundWire stream
1942 * This removes and frees port_rt and master_rt from a stream
1944 int sdw_stream_remove_master(struct sdw_bus *bus,
1945 struct sdw_stream_runtime *stream)
1947 struct sdw_master_runtime *m_rt, *_m_rt;
1949 mutex_lock(&bus->bus_lock);
1951 list_for_each_entry_safe(m_rt, _m_rt,
1952 &stream->master_list, stream_node) {
1953 if (m_rt->bus != bus)
1956 sdw_master_port_free(m_rt);
1957 sdw_master_rt_free(m_rt, stream);
1958 stream->m_rt_count--;
1961 if (list_empty(&stream->master_list))
1962 stream->state = SDW_STREAM_RELEASED;
1964 mutex_unlock(&bus->bus_lock);
1968 EXPORT_SYMBOL(sdw_stream_remove_master);
1971 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
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
1979 * It is expected that Slave is added before adding Master
1983 int sdw_stream_add_slave(struct sdw_slave *slave,
1984 struct sdw_stream_config *stream_config,
1985 const struct sdw_port_config *port_config,
1986 unsigned int num_ports,
1987 struct sdw_stream_runtime *stream)
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;
1996 mutex_lock(&slave->bus->bus_lock);
1999 * check if Master is already allocated, if so skip allocation
2000 * and go to configuration
2002 m_rt = sdw_master_rt_find(slave->bus, stream);
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.
2008 m_rt = sdw_master_rt_alloc(slave->bus, stream);
2010 dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
2011 __func__, stream->name);
2016 alloc_master_rt = true;
2019 s_rt = sdw_slave_rt_find(slave, stream);
2021 s_rt = sdw_slave_rt_alloc(slave, m_rt);
2023 dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n",
2029 alloc_slave_rt = true;
2032 if (!sdw_slave_port_allocated(s_rt)) {
2033 ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
2038 ret = sdw_master_rt_config(m_rt, stream_config);
2042 ret = sdw_slave_rt_config(s_rt, stream_config);
2046 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
2050 ret = sdw_slave_port_config(slave, s_rt, port_config);
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.
2060 stream->state = SDW_STREAM_CONFIGURED;
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()
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);
2074 mutex_unlock(&slave->bus->bus_lock);
2077 EXPORT_SYMBOL(sdw_stream_add_slave);
2080 * sdw_stream_remove_slave() - Remove slave from sdw_stream
2082 * @slave: SDW Slave instance
2083 * @stream: SoundWire stream
2085 * This removes and frees port_rt and slave_rt from a stream
2087 int sdw_stream_remove_slave(struct sdw_slave *slave,
2088 struct sdw_stream_runtime *stream)
2090 mutex_lock(&slave->bus->bus_lock);
2092 sdw_slave_port_free(slave, stream);
2093 sdw_slave_rt_free(slave, stream);
2095 mutex_unlock(&slave->bus->bus_lock);
2099 EXPORT_SYMBOL(sdw_stream_remove_slave);