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(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(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(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(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(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(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(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(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(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(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(s_rt->slave, addr, p_rt->ch_mask);
324 ret = sdw_write(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, SDW_OPS_PORT_PRE_PREP);
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(s_rt->slave, addr, p_rt->ch_mask);
481 ret = sdw_write(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(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, SDW_OPS_PORT_POST_PREP);
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 bus->defer_msg.msg = wr_msg;
689 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
695 /* Get row and column index to program register */
696 col_index = sdw_find_col_index(bus->params.col);
697 row_index = sdw_find_row_index(bus->params.row);
698 wbuf[0] = col_index | (row_index << 3);
700 if (bus->params.next_bank)
701 addr = SDW_SCP_FRAMECTRL_B1;
703 addr = SDW_SCP_FRAMECTRL_B0;
705 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
706 SDW_MSG_FLAG_WRITE, wbuf);
707 wr_msg->ssp_sync = true;
710 * Set the multi_link flag only when both the hardware supports
711 * and hardware-based sync is required
713 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
716 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
718 ret = sdw_transfer(bus, wr_msg);
720 if (ret < 0 && ret != -ENODATA) {
721 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
728 bus->defer_msg.msg = NULL;
729 bus->params.curr_bank = !bus->params.curr_bank;
730 bus->params.next_bank = !bus->params.next_bank;
739 bus->defer_msg.msg = NULL;
744 * sdw_ml_sync_bank_switch: Multilink register bank switch
746 * @bus: SDW bus instance
748 * Caller function should free the buffers on error
750 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
752 unsigned long time_left;
754 if (!bus->multi_link)
757 /* Wait for completion of transfer */
758 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
759 bus->bank_switch_timeout);
762 dev_err(bus->dev, "Controller Timed out on bank switch\n");
766 bus->params.curr_bank = !bus->params.curr_bank;
767 bus->params.next_bank = !bus->params.next_bank;
769 if (bus->defer_msg.msg) {
770 kfree(bus->defer_msg.msg->buf);
771 kfree(bus->defer_msg.msg);
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");
845 /* Set the bank switch timeout to default, if not set */
846 if (!bus->bank_switch_timeout)
847 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
849 /* Check if bank switch was successful */
850 ret = sdw_ml_sync_bank_switch(bus);
853 "multi link bank switch failed: %d\n", ret);
858 mutex_unlock(&bus->msg_lock);
864 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
866 if (bus->defer_msg.msg) {
867 kfree(bus->defer_msg.msg->buf);
868 kfree(bus->defer_msg.msg);
875 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
877 if (mutex_is_locked(&bus->msg_lock))
878 mutex_unlock(&bus->msg_lock);
886 * sdw_release_stream() - Free the assigned stream runtime
888 * @stream: SoundWire stream runtime
890 * sdw_release_stream should be called only once per stream
892 void sdw_release_stream(struct sdw_stream_runtime *stream)
896 EXPORT_SYMBOL(sdw_release_stream);
899 * sdw_alloc_stream() - Allocate and return stream runtime
901 * @stream_name: SoundWire stream name
903 * Allocates a SoundWire stream runtime instance.
904 * sdw_alloc_stream should be called only once per stream. Typically
905 * invoked from ALSA/ASoC machine/platform driver.
907 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
909 struct sdw_stream_runtime *stream;
911 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
915 stream->name = stream_name;
916 INIT_LIST_HEAD(&stream->master_list);
917 stream->state = SDW_STREAM_ALLOCATED;
918 stream->m_rt_count = 0;
922 EXPORT_SYMBOL(sdw_alloc_stream);
924 static struct sdw_master_runtime
925 *sdw_find_master_rt(struct sdw_bus *bus,
926 struct sdw_stream_runtime *stream)
928 struct sdw_master_runtime *m_rt;
930 /* Retrieve Bus handle if already available */
931 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
932 if (m_rt->bus == bus)
940 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
942 * @bus: SDW bus instance
943 * @stream_config: Stream configuration
944 * @stream: Stream runtime handle.
946 * This function is to be called with bus_lock held.
948 static struct sdw_master_runtime
949 *sdw_alloc_master_rt(struct sdw_bus *bus,
950 struct sdw_stream_config *stream_config,
951 struct sdw_stream_runtime *stream)
953 struct sdw_master_runtime *m_rt;
956 * check if Master is already allocated (as a result of Slave adding
957 * it first), if so skip allocation and go to configure
959 m_rt = sdw_find_master_rt(bus, stream);
963 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
967 /* Initialization of Master runtime handle */
968 INIT_LIST_HEAD(&m_rt->port_list);
969 INIT_LIST_HEAD(&m_rt->slave_rt_list);
970 list_add_tail(&m_rt->stream_node, &stream->master_list);
972 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
975 m_rt->ch_count = stream_config->ch_count;
977 m_rt->stream = stream;
978 m_rt->direction = stream_config->direction;
984 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
986 * @slave: Slave handle
987 * @stream_config: Stream configuration
988 * @stream: Stream runtime handle
990 * This function is to be called with bus_lock held.
992 static struct sdw_slave_runtime
993 *sdw_alloc_slave_rt(struct sdw_slave *slave,
994 struct sdw_stream_config *stream_config,
995 struct sdw_stream_runtime *stream)
997 struct sdw_slave_runtime *s_rt;
999 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1003 INIT_LIST_HEAD(&s_rt->port_list);
1004 s_rt->ch_count = stream_config->ch_count;
1005 s_rt->direction = stream_config->direction;
1006 s_rt->slave = slave;
1011 static void sdw_master_port_release(struct sdw_bus *bus,
1012 struct sdw_master_runtime *m_rt)
1014 struct sdw_port_runtime *p_rt, *_p_rt;
1016 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1017 list_del(&p_rt->port_node);
1022 static void sdw_slave_port_release(struct sdw_bus *bus,
1023 struct sdw_slave *slave,
1024 struct sdw_stream_runtime *stream)
1026 struct sdw_port_runtime *p_rt, *_p_rt;
1027 struct sdw_master_runtime *m_rt;
1028 struct sdw_slave_runtime *s_rt;
1030 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1031 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1032 if (s_rt->slave != slave)
1035 list_for_each_entry_safe(p_rt, _p_rt,
1036 &s_rt->port_list, port_node) {
1037 list_del(&p_rt->port_node);
1045 * sdw_release_slave_stream() - Free Slave(s) runtime handle
1047 * @slave: Slave handle.
1048 * @stream: Stream runtime handle.
1050 * This function is to be called with bus_lock held.
1052 static void sdw_release_slave_stream(struct sdw_slave *slave,
1053 struct sdw_stream_runtime *stream)
1055 struct sdw_slave_runtime *s_rt, *_s_rt;
1056 struct sdw_master_runtime *m_rt;
1058 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1059 /* Retrieve Slave runtime handle */
1060 list_for_each_entry_safe(s_rt, _s_rt,
1061 &m_rt->slave_rt_list, m_rt_node) {
1062 if (s_rt->slave == slave) {
1063 list_del(&s_rt->m_rt_node);
1072 * sdw_release_master_stream() - Free Master runtime handle
1074 * @m_rt: Master runtime node
1075 * @stream: Stream runtime handle.
1077 * This function is to be called with bus_lock held
1078 * It frees the Master runtime handle and associated Slave(s) runtime
1079 * handle. If this is called first then sdw_release_slave_stream() will have
1080 * no effect as Slave(s) runtime handle would already be freed up.
1082 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1083 struct sdw_stream_runtime *stream)
1085 struct sdw_slave_runtime *s_rt, *_s_rt;
1087 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1088 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1089 sdw_release_slave_stream(s_rt->slave, stream);
1092 list_del(&m_rt->stream_node);
1093 list_del(&m_rt->bus_node);
1098 * sdw_stream_remove_master() - Remove master from sdw_stream
1100 * @bus: SDW Bus instance
1101 * @stream: SoundWire stream
1103 * This removes and frees port_rt and master_rt from a stream
1105 int sdw_stream_remove_master(struct sdw_bus *bus,
1106 struct sdw_stream_runtime *stream)
1108 struct sdw_master_runtime *m_rt, *_m_rt;
1110 mutex_lock(&bus->bus_lock);
1112 list_for_each_entry_safe(m_rt, _m_rt,
1113 &stream->master_list, stream_node) {
1114 if (m_rt->bus != bus)
1117 sdw_master_port_release(bus, m_rt);
1118 sdw_release_master_stream(m_rt, stream);
1119 stream->m_rt_count--;
1122 if (list_empty(&stream->master_list))
1123 stream->state = SDW_STREAM_RELEASED;
1125 mutex_unlock(&bus->bus_lock);
1129 EXPORT_SYMBOL(sdw_stream_remove_master);
1132 * sdw_stream_remove_slave() - Remove slave from sdw_stream
1134 * @slave: SDW Slave instance
1135 * @stream: SoundWire stream
1137 * This removes and frees port_rt and slave_rt from a stream
1139 int sdw_stream_remove_slave(struct sdw_slave *slave,
1140 struct sdw_stream_runtime *stream)
1142 mutex_lock(&slave->bus->bus_lock);
1144 sdw_slave_port_release(slave->bus, slave, stream);
1145 sdw_release_slave_stream(slave, stream);
1147 mutex_unlock(&slave->bus->bus_lock);
1151 EXPORT_SYMBOL(sdw_stream_remove_slave);
1154 * sdw_config_stream() - Configure the allocated stream
1157 * @stream: SoundWire stream
1158 * @stream_config: Stream configuration for audio stream
1159 * @is_slave: is API called from Slave or Master
1161 * This function is to be called with bus_lock held.
1163 static int sdw_config_stream(struct device *dev,
1164 struct sdw_stream_runtime *stream,
1165 struct sdw_stream_config *stream_config,
1169 * Update the stream rate, channel and bps based on data
1170 * source. For more than one data source (multilink),
1171 * match the rate, bps, stream type and increment number of channels.
1173 * If rate/bps is zero, it means the values are not set, so skip
1174 * comparison and allow the value to be set and stored in stream
1176 if (stream->params.rate &&
1177 stream->params.rate != stream_config->frame_rate) {
1178 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1182 if (stream->params.bps &&
1183 stream->params.bps != stream_config->bps) {
1184 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1188 stream->type = stream_config->type;
1189 stream->params.rate = stream_config->frame_rate;
1190 stream->params.bps = stream_config->bps;
1192 /* TODO: Update this check during Device-device support */
1194 stream->params.ch_count += stream_config->ch_count;
1199 static int sdw_is_valid_port_range(struct device *dev,
1200 struct sdw_port_runtime *p_rt)
1202 if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1204 "SoundWire: Invalid port number :%d\n", p_rt->num);
1211 static struct sdw_port_runtime
1212 *sdw_port_alloc(struct device *dev,
1213 struct sdw_port_config *port_config,
1216 struct sdw_port_runtime *p_rt;
1218 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1222 p_rt->ch_mask = port_config[port_index].ch_mask;
1223 p_rt->num = port_config[port_index].num;
1228 static int sdw_master_port_config(struct sdw_bus *bus,
1229 struct sdw_master_runtime *m_rt,
1230 struct sdw_port_config *port_config,
1231 unsigned int num_ports)
1233 struct sdw_port_runtime *p_rt;
1236 /* Iterate for number of ports to perform initialization */
1237 for (i = 0; i < num_ports; i++) {
1238 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1243 * TODO: Check port capabilities for requested
1244 * configuration (audio mode support)
1247 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1253 static int sdw_slave_port_config(struct sdw_slave *slave,
1254 struct sdw_slave_runtime *s_rt,
1255 struct sdw_port_config *port_config,
1256 unsigned int num_config)
1258 struct sdw_port_runtime *p_rt;
1261 /* Iterate for number of ports to perform initialization */
1262 for (i = 0; i < num_config; i++) {
1263 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1268 * TODO: Check valid port range as defined by DisCo/
1271 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1278 * TODO: Check port capabilities for requested
1279 * configuration (audio mode support)
1282 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1289 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1291 * @bus: SDW Bus instance
1292 * @stream_config: Stream configuration for audio stream
1293 * @port_config: Port configuration for audio stream
1294 * @num_ports: Number of ports
1295 * @stream: SoundWire stream
1297 int sdw_stream_add_master(struct sdw_bus *bus,
1298 struct sdw_stream_config *stream_config,
1299 struct sdw_port_config *port_config,
1300 unsigned int num_ports,
1301 struct sdw_stream_runtime *stream)
1303 struct sdw_master_runtime *m_rt;
1306 mutex_lock(&bus->bus_lock);
1309 * For multi link streams, add the second master only if
1310 * the bus supports it.
1311 * Check if bus->multi_link is set
1313 if (!bus->multi_link && stream->m_rt_count > 0) {
1315 "Multilink not supported, link %d\n", bus->link_id);
1320 m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1323 "Master runtime config failed for stream:%s\n",
1329 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1333 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1337 stream->m_rt_count++;
1342 sdw_release_master_stream(m_rt, stream);
1344 mutex_unlock(&bus->bus_lock);
1347 EXPORT_SYMBOL(sdw_stream_add_master);
1350 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1352 * @slave: SDW Slave instance
1353 * @stream_config: Stream configuration for audio stream
1354 * @stream: SoundWire stream
1355 * @port_config: Port configuration for audio stream
1356 * @num_ports: Number of ports
1358 * It is expected that Slave is added before adding Master
1362 int sdw_stream_add_slave(struct sdw_slave *slave,
1363 struct sdw_stream_config *stream_config,
1364 struct sdw_port_config *port_config,
1365 unsigned int num_ports,
1366 struct sdw_stream_runtime *stream)
1368 struct sdw_slave_runtime *s_rt;
1369 struct sdw_master_runtime *m_rt;
1372 mutex_lock(&slave->bus->bus_lock);
1375 * If this API is invoked by Slave first then m_rt is not valid.
1376 * So, allocate m_rt and add Slave to it.
1378 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1380 dev_err(&slave->dev,
1381 "alloc master runtime failed for stream:%s\n",
1387 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1389 dev_err(&slave->dev,
1390 "Slave runtime config failed for stream:%s\n",
1396 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1399 * sdw_release_master_stream will release s_rt in slave_rt_list in
1400 * stream_error case, but s_rt is only added to slave_rt_list
1401 * when sdw_config_stream is successful, so free s_rt explicitly
1402 * when sdw_config_stream is failed.
1408 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1410 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1415 * Change stream state to CONFIGURED on first Slave add.
1416 * Bus is not aware of number of Slave(s) in a stream at this
1417 * point so cannot depend on all Slave(s) to be added in order to
1418 * change stream state to CONFIGURED.
1420 stream->state = SDW_STREAM_CONFIGURED;
1425 * we hit error so cleanup the stream, release all Slave(s) and
1428 sdw_release_master_stream(m_rt, stream);
1430 mutex_unlock(&slave->bus->bus_lock);
1433 EXPORT_SYMBOL(sdw_stream_add_slave);
1436 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1438 * @slave: Slave handle
1439 * @direction: Data direction.
1440 * @port_num: Port number
1442 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1443 enum sdw_data_direction direction,
1444 unsigned int port_num)
1446 struct sdw_dpn_prop *dpn_prop;
1450 if (direction == SDW_DATA_DIR_TX) {
1451 num_ports = hweight32(slave->prop.source_ports);
1452 dpn_prop = slave->prop.src_dpn_prop;
1454 num_ports = hweight32(slave->prop.sink_ports);
1455 dpn_prop = slave->prop.sink_dpn_prop;
1458 for (i = 0; i < num_ports; i++) {
1459 if (dpn_prop[i].num == port_num)
1460 return &dpn_prop[i];
1467 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1469 * @stream: SoundWire stream
1471 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1472 * stream to reconfigure the bus.
1473 * NOTE: This function is called from SoundWire stream ops and is
1474 * expected that a global lock is held before acquiring bus_lock.
1476 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1478 struct sdw_master_runtime *m_rt;
1479 struct sdw_bus *bus;
1481 /* Iterate for all Master(s) in Master list */
1482 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1485 mutex_lock(&bus->bus_lock);
1490 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1492 * @stream: SoundWire stream
1494 * Release the previously held bus_lock after reconfiguring the bus.
1495 * NOTE: This function is called from SoundWire stream ops and is
1496 * expected that a global lock is held before releasing bus_lock.
1498 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1500 struct sdw_master_runtime *m_rt;
1501 struct sdw_bus *bus;
1503 /* Iterate for all Master(s) in Master list */
1504 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1506 mutex_unlock(&bus->bus_lock);
1510 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1513 struct sdw_master_runtime *m_rt;
1514 struct sdw_bus *bus = NULL;
1515 struct sdw_master_prop *prop;
1516 struct sdw_bus_params params;
1519 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1520 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1523 memcpy(¶ms, &bus->params, sizeof(params));
1525 /* TODO: Support Asynchronous mode */
1526 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1527 dev_err(bus->dev, "Async mode not supported\n");
1532 goto program_params;
1534 /* Increment cumulative bus bandwidth */
1535 /* TODO: Update this during Device-Device support */
1536 bus->params.bandwidth += m_rt->stream->params.rate *
1537 m_rt->ch_count * m_rt->stream->params.bps;
1539 /* Compute params */
1540 if (bus->compute_params) {
1541 ret = bus->compute_params(bus);
1543 dev_err(bus->dev, "Compute params failed: %d\n",
1550 /* Program params */
1551 ret = sdw_program_params(bus, true);
1553 dev_err(bus->dev, "Program params failed: %d\n", ret);
1554 goto restore_params;
1559 pr_err("Configuration error in %s\n", __func__);
1563 ret = do_bank_switch(stream);
1565 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1566 goto restore_params;
1569 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1572 /* Prepare port(s) on the new clock configuration */
1573 ret = sdw_prep_deprep_ports(m_rt, true);
1575 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1581 stream->state = SDW_STREAM_PREPARED;
1586 memcpy(&bus->params, ¶ms, sizeof(params));
1591 * sdw_prepare_stream() - Prepare SoundWire stream
1593 * @stream: Soundwire stream
1595 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1597 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1599 bool update_params = true;
1603 pr_err("SoundWire: Handle not found for stream\n");
1607 sdw_acquire_bus_lock(stream);
1609 if (stream->state == SDW_STREAM_PREPARED) {
1614 if (stream->state != SDW_STREAM_CONFIGURED &&
1615 stream->state != SDW_STREAM_DEPREPARED &&
1616 stream->state != SDW_STREAM_DISABLED) {
1617 pr_err("%s: %s: inconsistent state state %d\n",
1618 __func__, stream->name, stream->state);
1624 * when the stream is DISABLED, this means sdw_prepare_stream()
1625 * is called as a result of an underflow or a resume operation.
1626 * In this case, the bus parameters shall not be recomputed, but
1627 * still need to be re-applied
1629 if (stream->state == SDW_STREAM_DISABLED)
1630 update_params = false;
1632 ret = _sdw_prepare_stream(stream, update_params);
1635 sdw_release_bus_lock(stream);
1638 EXPORT_SYMBOL(sdw_prepare_stream);
1640 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1642 struct sdw_master_runtime *m_rt;
1643 struct sdw_bus *bus = NULL;
1646 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1647 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1650 /* Program params */
1651 ret = sdw_program_params(bus, false);
1653 dev_err(bus->dev, "Program params failed: %d\n", ret);
1657 /* Enable port(s) */
1658 ret = sdw_enable_disable_ports(m_rt, true);
1661 "Enable port(s) failed ret: %d\n", ret);
1667 pr_err("Configuration error in %s\n", __func__);
1671 ret = do_bank_switch(stream);
1673 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1677 stream->state = SDW_STREAM_ENABLED;
1682 * sdw_enable_stream() - Enable SoundWire stream
1684 * @stream: Soundwire stream
1686 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1688 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1693 pr_err("SoundWire: Handle not found for stream\n");
1697 sdw_acquire_bus_lock(stream);
1699 if (stream->state != SDW_STREAM_PREPARED &&
1700 stream->state != SDW_STREAM_DISABLED) {
1701 pr_err("%s: %s: inconsistent state state %d\n",
1702 __func__, stream->name, stream->state);
1707 ret = _sdw_enable_stream(stream);
1710 sdw_release_bus_lock(stream);
1713 EXPORT_SYMBOL(sdw_enable_stream);
1715 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1717 struct sdw_master_runtime *m_rt;
1720 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1721 struct sdw_bus *bus = m_rt->bus;
1723 /* Disable port(s) */
1724 ret = sdw_enable_disable_ports(m_rt, false);
1726 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1730 stream->state = SDW_STREAM_DISABLED;
1732 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1733 struct sdw_bus *bus = m_rt->bus;
1735 /* Program params */
1736 ret = sdw_program_params(bus, false);
1738 dev_err(bus->dev, "Program params failed: %d\n", ret);
1743 ret = do_bank_switch(stream);
1745 pr_err("Bank switch failed: %d\n", ret);
1749 /* make sure alternate bank (previous current) is also disabled */
1750 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1751 struct sdw_bus *bus = m_rt->bus;
1753 /* Disable port(s) */
1754 ret = sdw_enable_disable_ports(m_rt, false);
1756 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1765 * sdw_disable_stream() - Disable SoundWire stream
1767 * @stream: Soundwire stream
1769 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1771 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1776 pr_err("SoundWire: Handle not found for stream\n");
1780 sdw_acquire_bus_lock(stream);
1782 if (stream->state != SDW_STREAM_ENABLED) {
1783 pr_err("%s: %s: inconsistent state state %d\n",
1784 __func__, stream->name, stream->state);
1789 ret = _sdw_disable_stream(stream);
1792 sdw_release_bus_lock(stream);
1795 EXPORT_SYMBOL(sdw_disable_stream);
1797 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1799 struct sdw_master_runtime *m_rt;
1800 struct sdw_bus *bus;
1803 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1805 /* De-prepare port(s) */
1806 ret = sdw_prep_deprep_ports(m_rt, false);
1809 "De-prepare port(s) failed: %d\n", ret);
1813 /* TODO: Update this during Device-Device support */
1814 bus->params.bandwidth -= m_rt->stream->params.rate *
1815 m_rt->ch_count * m_rt->stream->params.bps;
1817 /* Compute params */
1818 if (bus->compute_params) {
1819 ret = bus->compute_params(bus);
1821 dev_err(bus->dev, "Compute params failed: %d\n",
1827 /* Program params */
1828 ret = sdw_program_params(bus, false);
1830 dev_err(bus->dev, "Program params failed: %d\n", ret);
1835 stream->state = SDW_STREAM_DEPREPARED;
1836 return do_bank_switch(stream);
1840 * sdw_deprepare_stream() - Deprepare SoundWire stream
1842 * @stream: Soundwire stream
1844 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1846 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1851 pr_err("SoundWire: Handle not found for stream\n");
1855 sdw_acquire_bus_lock(stream);
1857 if (stream->state != SDW_STREAM_PREPARED &&
1858 stream->state != SDW_STREAM_DISABLED) {
1859 pr_err("%s: %s: inconsistent state state %d\n",
1860 __func__, stream->name, stream->state);
1865 ret = _sdw_deprepare_stream(stream);
1868 sdw_release_bus_lock(stream);
1871 EXPORT_SYMBOL(sdw_deprepare_stream);
1873 static int set_stream(struct snd_pcm_substream *substream,
1874 struct sdw_stream_runtime *sdw_stream)
1876 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1877 struct snd_soc_dai *dai;
1881 /* Set stream pointer on all DAIs */
1882 for_each_rtd_dais(rtd, i, dai) {
1883 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1885 dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1894 * sdw_startup_stream() - Startup SoundWire stream
1896 * @sdw_substream: Soundwire stream
1898 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1900 int sdw_startup_stream(void *sdw_substream)
1902 struct snd_pcm_substream *substream = sdw_substream;
1903 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1904 struct sdw_stream_runtime *sdw_stream;
1908 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1909 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1911 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1916 sdw_stream = sdw_alloc_stream(name);
1918 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1923 ret = set_stream(substream, sdw_stream);
1925 goto release_stream;
1929 sdw_release_stream(sdw_stream);
1930 set_stream(substream, NULL);
1935 EXPORT_SYMBOL(sdw_startup_stream);
1938 * sdw_shutdown_stream() - Shutdown SoundWire stream
1940 * @sdw_substream: Soundwire stream
1942 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1944 void sdw_shutdown_stream(void *sdw_substream)
1946 struct snd_pcm_substream *substream = sdw_substream;
1947 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1948 struct sdw_stream_runtime *sdw_stream;
1949 struct snd_soc_dai *dai;
1951 /* Find stream from first CPU DAI */
1952 dai = asoc_rtd_to_cpu(rtd, 0);
1954 sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1956 if (IS_ERR(sdw_stream)) {
1957 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1961 /* release memory */
1962 kfree(sdw_stream->name);
1963 sdw_release_stream(sdw_stream);
1965 /* clear DAI data */
1966 set_stream(substream, NULL);
1968 EXPORT_SYMBOL(sdw_shutdown_stream);