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 <sound/soc.h>
20 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
22 * The rows are arranged as per the array index value programmed
23 * in register. The index 15 has dummy value 0 in order to fill hole.
25 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
26 96, 100, 120, 128, 150, 160, 250, 0,
27 192, 200, 240, 256, 72, 144, 90, 180};
29 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
31 int sdw_find_col_index(int col)
35 for (i = 0; i < SDW_FRAME_COLS; i++) {
36 if (sdw_cols[i] == col)
40 pr_warn("Requested column not found, selecting lowest column no: 2\n");
43 EXPORT_SYMBOL(sdw_find_col_index);
45 int sdw_find_row_index(int row)
49 for (i = 0; i < SDW_FRAME_ROWS; i++) {
50 if (sdw_rows[i] == row)
54 pr_warn("Requested row not found, selecting lowest row no: 48\n");
57 EXPORT_SYMBOL(sdw_find_row_index);
59 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
60 struct sdw_slave *slave,
61 struct sdw_transport_params *t_params,
62 enum sdw_dpn_type type)
64 u32 addr1, addr2, addr3, addr4;
68 if (bus->params.next_bank) {
69 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
70 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
71 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
72 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
74 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
75 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
76 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
77 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
80 /* Program DPN_OffsetCtrl2 registers */
81 ret = sdw_write(slave, addr1, t_params->offset2);
83 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
87 /* Program DPN_BlockCtrl3 register */
88 ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
90 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
95 * Data ports are FULL, SIMPLE and REDUCED. This function handles
96 * FULL and REDUCED only and beyond this point only FULL is
97 * handled, so bail out if we are not FULL data port type
99 if (type != SDW_DPN_FULL)
102 /* Program DPN_SampleCtrl2 register */
103 wbuf = (t_params->sample_interval - 1);
104 wbuf &= SDW_DPN_SAMPLECTRL_HIGH;
105 wbuf >>= SDW_REG_SHIFT(SDW_DPN_SAMPLECTRL_HIGH);
107 ret = sdw_write(slave, addr3, wbuf);
109 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
113 /* Program DPN_HCtrl register */
114 wbuf = t_params->hstart;
115 wbuf <<= SDW_REG_SHIFT(SDW_DPN_HCTRL_HSTART);
116 wbuf |= 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 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
143 addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
144 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
146 if (bus->params.next_bank) {
147 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
148 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
149 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
150 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
153 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
154 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
155 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
156 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
159 /* Program DPN_PortCtrl register */
160 wbuf = p_params->data_mode << SDW_REG_SHIFT(SDW_DPN_PORTCTRL_DATAMODE);
161 wbuf |= p_params->flow_mode;
163 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
165 dev_err(&s_rt->slave->dev,
166 "DPN_PortCtrl register write failed for port %d\n",
171 if (!dpn_prop->read_only_wordlength) {
172 /* Program DPN_BlockCtrl1 register */
173 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
175 dev_err(&s_rt->slave->dev,
176 "DPN_BlockCtrl1 register write failed for port %d\n",
182 /* Program DPN_SampleCtrl1 register */
183 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
184 ret = sdw_write(s_rt->slave, addr3, wbuf);
186 dev_err(&s_rt->slave->dev,
187 "DPN_SampleCtrl1 register write failed for port %d\n",
192 /* Program DPN_OffsetCtrl1 registers */
193 ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
195 dev_err(&s_rt->slave->dev,
196 "DPN_OffsetCtrl1 register write failed for port %d\n",
201 /* Program DPN_BlockCtrl2 register*/
202 if (t_params->blk_grp_ctrl_valid) {
203 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
205 dev_err(&s_rt->slave->dev,
206 "DPN_BlockCtrl2 reg write failed for port %d\n",
212 /* program DPN_LaneCtrl register */
213 if (slave_prop->lane_control_support) {
214 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
216 dev_err(&s_rt->slave->dev,
217 "DPN_LaneCtrl register write failed for port %d\n",
223 if (dpn_prop->type != SDW_DPN_SIMPLE) {
224 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
225 t_params, dpn_prop->type);
227 dev_err(&s_rt->slave->dev,
228 "Transport reg write failed for port: %d\n",
235 static int sdw_program_master_port_params(struct sdw_bus *bus,
236 struct sdw_port_runtime *p_rt)
241 * we need to set transport and port parameters for the port.
242 * Transport parameters refers to the sample interval, offsets and
243 * hstart/stop etc of the data. Port parameters refers to word
244 * length, flow mode etc of the port
246 ret = bus->port_ops->dpn_set_port_transport_params(bus,
247 &p_rt->transport_params,
248 bus->params.next_bank);
252 return bus->port_ops->dpn_set_port_params(bus,
254 bus->params.next_bank);
258 * sdw_program_port_params() - Programs transport parameters of Master(s)
261 * @m_rt: Master stream runtime
263 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
265 struct sdw_slave_runtime *s_rt = NULL;
266 struct sdw_bus *bus = m_rt->bus;
267 struct sdw_port_runtime *p_rt;
270 /* Program transport & port parameters for Slave(s) */
271 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
272 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
273 ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
279 /* Program transport & port parameters for Master(s) */
280 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
281 ret = sdw_program_master_port_params(bus, p_rt);
290 * sdw_enable_disable_slave_ports: Enable/disable slave data port
293 * @s_rt: slave runtime
294 * @p_rt: port runtime
295 * @en: enable or disable operation
297 * This function only sets the enable/disable bits in the relevant bank, the
298 * actual enable/disable is done with a bank switch
300 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
301 struct sdw_slave_runtime *s_rt,
302 struct sdw_port_runtime *p_rt,
305 struct sdw_transport_params *t_params = &p_rt->transport_params;
309 if (bus->params.next_bank)
310 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
312 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
315 * Since bus doesn't support sharing a port across two streams,
316 * it is safe to reset this register
319 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
321 ret = sdw_write(s_rt->slave, addr, 0x0);
324 dev_err(&s_rt->slave->dev,
325 "Slave chn_en reg write failed:%d port:%d\n",
326 ret, t_params->port_num);
331 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
332 struct sdw_port_runtime *p_rt,
335 struct sdw_transport_params *t_params = &p_rt->transport_params;
336 struct sdw_bus *bus = m_rt->bus;
337 struct sdw_enable_ch enable_ch;
340 enable_ch.port_num = p_rt->num;
341 enable_ch.ch_mask = p_rt->ch_mask;
342 enable_ch.enable = en;
344 /* Perform Master port channel(s) enable/disable */
345 if (bus->port_ops->dpn_port_enable_ch) {
346 ret = bus->port_ops->dpn_port_enable_ch(bus,
348 bus->params.next_bank);
351 "Master chn_en write failed:%d port:%d\n",
352 ret, t_params->port_num);
357 "dpn_port_enable_ch not supported, %s failed\n",
358 en ? "enable" : "disable");
366 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
369 * @m_rt: Master stream runtime
370 * @en: mode (enable/disable)
372 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
374 struct sdw_port_runtime *s_port, *m_port;
375 struct sdw_slave_runtime *s_rt;
378 /* Enable/Disable Slave port(s) */
379 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
380 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
381 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
388 /* Enable/Disable Master port(s) */
389 list_for_each_entry(m_port, &m_rt->port_list, port_node) {
390 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
398 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
399 struct sdw_prepare_ch prep_ch,
400 enum sdw_port_prep_ops cmd)
402 const struct sdw_slave_ops *ops = s_rt->slave->ops;
405 if (ops->port_prep) {
406 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
408 dev_err(&s_rt->slave->dev,
409 "Slave Port Prep cmd %d failed: %d\n",
418 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
419 struct sdw_slave_runtime *s_rt,
420 struct sdw_port_runtime *p_rt,
423 struct completion *port_ready;
424 struct sdw_dpn_prop *dpn_prop;
425 struct sdw_prepare_ch prep_ch;
426 unsigned int time_left;
431 prep_ch.num = p_rt->num;
432 prep_ch.ch_mask = p_rt->ch_mask;
434 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
439 "Slave Port:%d properties not found\n", prep_ch.num);
443 prep_ch.prepare = prep;
445 prep_ch.bank = bus->params.next_bank;
447 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm)
451 * Enable interrupt before Port prepare.
452 * For Port de-prepare, it is assumed that port
453 * was prepared earlier
456 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
457 dpn_prop->imp_def_interrupts);
462 /* Inform slave about the impending port prepare */
463 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
465 /* Prepare Slave port implementing CP_SM */
466 if (!dpn_prop->simple_ch_prep_sm) {
467 addr = SDW_DPN_PREPARECTRL(p_rt->num);
470 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
472 ret = sdw_write(s_rt->slave, addr, 0x0);
475 dev_err(&s_rt->slave->dev,
476 "Slave prep_ctrl reg write failed\n");
480 /* Wait for completion on port ready */
481 port_ready = &s_rt->slave->port_ready[prep_ch.num];
482 time_left = wait_for_completion_timeout(port_ready,
483 msecs_to_jiffies(dpn_prop->ch_prep_timeout));
485 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
486 val &= p_rt->ch_mask;
487 if (!time_left || val) {
488 dev_err(&s_rt->slave->dev,
489 "Chn prep failed for port:%d\n", prep_ch.num);
494 /* Inform slaves about ports prepared */
495 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
497 /* Disable interrupt after Port de-prepare */
499 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
500 dpn_prop->imp_def_interrupts);
505 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
506 struct sdw_port_runtime *p_rt,
509 struct sdw_transport_params *t_params = &p_rt->transport_params;
510 struct sdw_bus *bus = m_rt->bus;
511 const struct sdw_master_port_ops *ops = bus->port_ops;
512 struct sdw_prepare_ch prep_ch;
515 prep_ch.num = p_rt->num;
516 prep_ch.ch_mask = p_rt->ch_mask;
517 prep_ch.prepare = prep; /* Prepare/De-prepare */
518 prep_ch.bank = bus->params.next_bank;
520 /* Pre-prepare/Pre-deprepare port(s) */
521 if (ops->dpn_port_prep) {
522 ret = ops->dpn_port_prep(bus, &prep_ch);
524 dev_err(bus->dev, "Port prepare failed for port:%d\n",
534 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
537 * @m_rt: Master runtime handle
538 * @prep: Prepare or De-prepare
540 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
542 struct sdw_slave_runtime *s_rt;
543 struct sdw_port_runtime *p_rt;
546 /* Prepare/De-prepare Slave port(s) */
547 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
548 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
549 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
556 /* Prepare/De-prepare Master port(s) */
557 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
558 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
567 * sdw_notify_config() - Notify bus configuration
569 * @m_rt: Master runtime handle
571 * This function notifies the Master(s) and Slave(s) of the
572 * new bus configuration.
574 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
576 struct sdw_slave_runtime *s_rt;
577 struct sdw_bus *bus = m_rt->bus;
578 struct sdw_slave *slave;
581 if (bus->ops->set_bus_conf) {
582 ret = bus->ops->set_bus_conf(bus, &bus->params);
587 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
590 if (slave->ops->bus_config) {
591 ret = slave->ops->bus_config(slave, &bus->params);
593 dev_err(bus->dev, "Notify Slave: %d failed\n",
604 * sdw_program_params() - Program transport and port parameters for Master(s)
607 * @bus: SDW bus instance
608 * @prepare: true if sdw_program_params() is called by _prepare.
610 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
612 struct sdw_master_runtime *m_rt;
615 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
618 * this loop walks through all master runtimes for a
619 * bus, but the ports can only be configured while
620 * explicitly preparing a stream or handling an
621 * already-prepared stream otherwise.
624 m_rt->stream->state == SDW_STREAM_CONFIGURED)
627 ret = sdw_program_port_params(m_rt);
630 "Program transport params failed: %d\n", ret);
634 ret = sdw_notify_config(m_rt);
637 "Notify bus config failed: %d\n", ret);
641 /* Enable port(s) on alternate bank for all active streams */
642 if (m_rt->stream->state != SDW_STREAM_ENABLED)
645 ret = sdw_enable_disable_ports(m_rt, true);
647 dev_err(bus->dev, "Enable channel failed: %d\n", ret);
655 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
657 int col_index, row_index;
659 struct sdw_msg *wr_msg;
664 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
668 bus->defer_msg.msg = wr_msg;
670 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
676 /* Get row and column index to program register */
677 col_index = sdw_find_col_index(bus->params.col);
678 row_index = sdw_find_row_index(bus->params.row);
679 wbuf[0] = col_index | (row_index << 3);
681 if (bus->params.next_bank)
682 addr = SDW_SCP_FRAMECTRL_B1;
684 addr = SDW_SCP_FRAMECTRL_B0;
686 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
687 SDW_MSG_FLAG_WRITE, wbuf);
688 wr_msg->ssp_sync = true;
691 * Set the multi_link flag only when both the hardware supports
692 * and there is a stream handled by multiple masters
694 multi_link = bus->multi_link && (m_rt_count > 1);
697 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
699 ret = sdw_transfer(bus, wr_msg);
702 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
709 bus->defer_msg.msg = NULL;
710 bus->params.curr_bank = !bus->params.curr_bank;
711 bus->params.next_bank = !bus->params.next_bank;
720 bus->defer_msg.msg = NULL;
725 * sdw_ml_sync_bank_switch: Multilink register bank switch
727 * @bus: SDW bus instance
729 * Caller function should free the buffers on error
731 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
733 unsigned long time_left;
735 if (!bus->multi_link)
738 /* Wait for completion of transfer */
739 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
740 bus->bank_switch_timeout);
743 dev_err(bus->dev, "Controller Timed out on bank switch\n");
747 bus->params.curr_bank = !bus->params.curr_bank;
748 bus->params.next_bank = !bus->params.next_bank;
750 if (bus->defer_msg.msg) {
751 kfree(bus->defer_msg.msg->buf);
752 kfree(bus->defer_msg.msg);
758 static int do_bank_switch(struct sdw_stream_runtime *stream)
760 struct sdw_master_runtime *m_rt;
761 const struct sdw_master_ops *ops;
763 bool multi_link = false;
766 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
770 if (bus->multi_link) {
772 mutex_lock(&bus->msg_lock);
775 /* Pre-bank switch */
776 if (ops->pre_bank_switch) {
777 ret = ops->pre_bank_switch(bus);
780 "Pre bank switch op failed: %d\n", ret);
786 * Perform Bank switch operation.
787 * For multi link cases, the actual bank switch is
788 * synchronized across all Masters and happens later as a
789 * part of post_bank_switch ops.
791 ret = sdw_bank_switch(bus, stream->m_rt_count);
793 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
799 * For multi link cases, it is expected that the bank switch is
800 * triggered by the post_bank_switch for the first Master in the list
801 * and for the other Masters the post_bank_switch() should return doing
804 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
808 /* Post-bank switch */
809 if (ops->post_bank_switch) {
810 ret = ops->post_bank_switch(bus);
813 "Post bank switch op failed: %d\n",
817 } else if (bus->multi_link && stream->m_rt_count > 1) {
819 "Post bank switch ops not implemented\n");
823 /* Set the bank switch timeout to default, if not set */
824 if (!bus->bank_switch_timeout)
825 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
827 /* Check if bank switch was successful */
828 ret = sdw_ml_sync_bank_switch(bus);
831 "multi link bank switch failed: %d\n", ret);
836 mutex_unlock(&bus->msg_lock);
842 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
844 if (bus->defer_msg.msg) {
845 kfree(bus->defer_msg.msg->buf);
846 kfree(bus->defer_msg.msg);
853 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
855 if (mutex_is_locked(&bus->msg_lock))
856 mutex_unlock(&bus->msg_lock);
864 * sdw_release_stream() - Free the assigned stream runtime
866 * @stream: SoundWire stream runtime
868 * sdw_release_stream should be called only once per stream
870 void sdw_release_stream(struct sdw_stream_runtime *stream)
874 EXPORT_SYMBOL(sdw_release_stream);
877 * sdw_alloc_stream() - Allocate and return stream runtime
879 * @stream_name: SoundWire stream name
881 * Allocates a SoundWire stream runtime instance.
882 * sdw_alloc_stream should be called only once per stream. Typically
883 * invoked from ALSA/ASoC machine/platform driver.
885 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
887 struct sdw_stream_runtime *stream;
889 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
893 stream->name = stream_name;
894 INIT_LIST_HEAD(&stream->master_list);
895 stream->state = SDW_STREAM_ALLOCATED;
896 stream->m_rt_count = 0;
900 EXPORT_SYMBOL(sdw_alloc_stream);
902 static struct sdw_master_runtime
903 *sdw_find_master_rt(struct sdw_bus *bus,
904 struct sdw_stream_runtime *stream)
906 struct sdw_master_runtime *m_rt;
908 /* Retrieve Bus handle if already available */
909 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
910 if (m_rt->bus == bus)
918 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
920 * @bus: SDW bus instance
921 * @stream_config: Stream configuration
922 * @stream: Stream runtime handle.
924 * This function is to be called with bus_lock held.
926 static struct sdw_master_runtime
927 *sdw_alloc_master_rt(struct sdw_bus *bus,
928 struct sdw_stream_config *stream_config,
929 struct sdw_stream_runtime *stream)
931 struct sdw_master_runtime *m_rt;
934 * check if Master is already allocated (as a result of Slave adding
935 * it first), if so skip allocation and go to configure
937 m_rt = sdw_find_master_rt(bus, stream);
941 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
945 /* Initialization of Master runtime handle */
946 INIT_LIST_HEAD(&m_rt->port_list);
947 INIT_LIST_HEAD(&m_rt->slave_rt_list);
948 list_add_tail(&m_rt->stream_node, &stream->master_list);
950 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
953 m_rt->ch_count = stream_config->ch_count;
955 m_rt->stream = stream;
956 m_rt->direction = stream_config->direction;
962 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
964 * @slave: Slave handle
965 * @stream_config: Stream configuration
966 * @stream: Stream runtime handle
968 * This function is to be called with bus_lock held.
970 static struct sdw_slave_runtime
971 *sdw_alloc_slave_rt(struct sdw_slave *slave,
972 struct sdw_stream_config *stream_config,
973 struct sdw_stream_runtime *stream)
975 struct sdw_slave_runtime *s_rt;
977 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
981 INIT_LIST_HEAD(&s_rt->port_list);
982 s_rt->ch_count = stream_config->ch_count;
983 s_rt->direction = stream_config->direction;
989 static void sdw_master_port_release(struct sdw_bus *bus,
990 struct sdw_master_runtime *m_rt)
992 struct sdw_port_runtime *p_rt, *_p_rt;
994 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
995 list_del(&p_rt->port_node);
1000 static void sdw_slave_port_release(struct sdw_bus *bus,
1001 struct sdw_slave *slave,
1002 struct sdw_stream_runtime *stream)
1004 struct sdw_port_runtime *p_rt, *_p_rt;
1005 struct sdw_master_runtime *m_rt;
1006 struct sdw_slave_runtime *s_rt;
1008 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1009 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1010 if (s_rt->slave != slave)
1013 list_for_each_entry_safe(p_rt, _p_rt,
1014 &s_rt->port_list, port_node) {
1015 list_del(&p_rt->port_node);
1023 * sdw_release_slave_stream() - Free Slave(s) runtime handle
1025 * @slave: Slave handle.
1026 * @stream: Stream runtime handle.
1028 * This function is to be called with bus_lock held.
1030 static void sdw_release_slave_stream(struct sdw_slave *slave,
1031 struct sdw_stream_runtime *stream)
1033 struct sdw_slave_runtime *s_rt, *_s_rt;
1034 struct sdw_master_runtime *m_rt;
1036 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1037 /* Retrieve Slave runtime handle */
1038 list_for_each_entry_safe(s_rt, _s_rt,
1039 &m_rt->slave_rt_list, m_rt_node) {
1040 if (s_rt->slave == slave) {
1041 list_del(&s_rt->m_rt_node);
1050 * sdw_release_master_stream() - Free Master runtime handle
1052 * @m_rt: Master runtime node
1053 * @stream: Stream runtime handle.
1055 * This function is to be called with bus_lock held
1056 * It frees the Master runtime handle and associated Slave(s) runtime
1057 * handle. If this is called first then sdw_release_slave_stream() will have
1058 * no effect as Slave(s) runtime handle would already be freed up.
1060 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1061 struct sdw_stream_runtime *stream)
1063 struct sdw_slave_runtime *s_rt, *_s_rt;
1065 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1066 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1067 sdw_release_slave_stream(s_rt->slave, stream);
1070 list_del(&m_rt->stream_node);
1071 list_del(&m_rt->bus_node);
1076 * sdw_stream_remove_master() - Remove master from sdw_stream
1078 * @bus: SDW Bus instance
1079 * @stream: SoundWire stream
1081 * This removes and frees port_rt and master_rt from a stream
1083 int sdw_stream_remove_master(struct sdw_bus *bus,
1084 struct sdw_stream_runtime *stream)
1086 struct sdw_master_runtime *m_rt, *_m_rt;
1088 mutex_lock(&bus->bus_lock);
1090 list_for_each_entry_safe(m_rt, _m_rt,
1091 &stream->master_list, stream_node) {
1092 if (m_rt->bus != bus)
1095 sdw_master_port_release(bus, m_rt);
1096 sdw_release_master_stream(m_rt, stream);
1097 stream->m_rt_count--;
1100 if (list_empty(&stream->master_list))
1101 stream->state = SDW_STREAM_RELEASED;
1103 mutex_unlock(&bus->bus_lock);
1107 EXPORT_SYMBOL(sdw_stream_remove_master);
1110 * sdw_stream_remove_slave() - Remove slave from sdw_stream
1112 * @slave: SDW Slave instance
1113 * @stream: SoundWire stream
1115 * This removes and frees port_rt and slave_rt from a stream
1117 int sdw_stream_remove_slave(struct sdw_slave *slave,
1118 struct sdw_stream_runtime *stream)
1120 mutex_lock(&slave->bus->bus_lock);
1122 sdw_slave_port_release(slave->bus, slave, stream);
1123 sdw_release_slave_stream(slave, stream);
1125 mutex_unlock(&slave->bus->bus_lock);
1129 EXPORT_SYMBOL(sdw_stream_remove_slave);
1132 * sdw_config_stream() - Configure the allocated stream
1135 * @stream: SoundWire stream
1136 * @stream_config: Stream configuration for audio stream
1137 * @is_slave: is API called from Slave or Master
1139 * This function is to be called with bus_lock held.
1141 static int sdw_config_stream(struct device *dev,
1142 struct sdw_stream_runtime *stream,
1143 struct sdw_stream_config *stream_config,
1147 * Update the stream rate, channel and bps based on data
1148 * source. For more than one data source (multilink),
1149 * match the rate, bps, stream type and increment number of channels.
1151 * If rate/bps is zero, it means the values are not set, so skip
1152 * comparison and allow the value to be set and stored in stream
1154 if (stream->params.rate &&
1155 stream->params.rate != stream_config->frame_rate) {
1156 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1160 if (stream->params.bps &&
1161 stream->params.bps != stream_config->bps) {
1162 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1166 stream->type = stream_config->type;
1167 stream->params.rate = stream_config->frame_rate;
1168 stream->params.bps = stream_config->bps;
1170 /* TODO: Update this check during Device-device support */
1172 stream->params.ch_count += stream_config->ch_count;
1177 static int sdw_is_valid_port_range(struct device *dev,
1178 struct sdw_port_runtime *p_rt)
1180 if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1182 "SoundWire: Invalid port number :%d\n", p_rt->num);
1189 static struct sdw_port_runtime
1190 *sdw_port_alloc(struct device *dev,
1191 struct sdw_port_config *port_config,
1194 struct sdw_port_runtime *p_rt;
1196 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1200 p_rt->ch_mask = port_config[port_index].ch_mask;
1201 p_rt->num = port_config[port_index].num;
1206 static int sdw_master_port_config(struct sdw_bus *bus,
1207 struct sdw_master_runtime *m_rt,
1208 struct sdw_port_config *port_config,
1209 unsigned int num_ports)
1211 struct sdw_port_runtime *p_rt;
1214 /* Iterate for number of ports to perform initialization */
1215 for (i = 0; i < num_ports; i++) {
1216 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1221 * TODO: Check port capabilities for requested
1222 * configuration (audio mode support)
1225 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1231 static int sdw_slave_port_config(struct sdw_slave *slave,
1232 struct sdw_slave_runtime *s_rt,
1233 struct sdw_port_config *port_config,
1234 unsigned int num_config)
1236 struct sdw_port_runtime *p_rt;
1239 /* Iterate for number of ports to perform initialization */
1240 for (i = 0; i < num_config; i++) {
1241 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1246 * TODO: Check valid port range as defined by DisCo/
1249 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1256 * TODO: Check port capabilities for requested
1257 * configuration (audio mode support)
1260 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1267 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1269 * @bus: SDW Bus instance
1270 * @stream_config: Stream configuration for audio stream
1271 * @port_config: Port configuration for audio stream
1272 * @num_ports: Number of ports
1273 * @stream: SoundWire stream
1275 int sdw_stream_add_master(struct sdw_bus *bus,
1276 struct sdw_stream_config *stream_config,
1277 struct sdw_port_config *port_config,
1278 unsigned int num_ports,
1279 struct sdw_stream_runtime *stream)
1281 struct sdw_master_runtime *m_rt;
1284 mutex_lock(&bus->bus_lock);
1287 * For multi link streams, add the second master only if
1288 * the bus supports it.
1289 * Check if bus->multi_link is set
1291 if (!bus->multi_link && stream->m_rt_count > 0) {
1293 "Multilink not supported, link %d\n", bus->link_id);
1298 m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1301 "Master runtime config failed for stream:%s\n",
1307 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1311 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1315 stream->m_rt_count++;
1320 sdw_release_master_stream(m_rt, stream);
1322 mutex_unlock(&bus->bus_lock);
1325 EXPORT_SYMBOL(sdw_stream_add_master);
1328 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1330 * @slave: SDW Slave instance
1331 * @stream_config: Stream configuration for audio stream
1332 * @stream: SoundWire stream
1333 * @port_config: Port configuration for audio stream
1334 * @num_ports: Number of ports
1336 * It is expected that Slave is added before adding Master
1340 int sdw_stream_add_slave(struct sdw_slave *slave,
1341 struct sdw_stream_config *stream_config,
1342 struct sdw_port_config *port_config,
1343 unsigned int num_ports,
1344 struct sdw_stream_runtime *stream)
1346 struct sdw_slave_runtime *s_rt;
1347 struct sdw_master_runtime *m_rt;
1350 mutex_lock(&slave->bus->bus_lock);
1353 * If this API is invoked by Slave first then m_rt is not valid.
1354 * So, allocate m_rt and add Slave to it.
1356 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1358 dev_err(&slave->dev,
1359 "alloc master runtime failed for stream:%s\n",
1365 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1367 dev_err(&slave->dev,
1368 "Slave runtime config failed for stream:%s\n",
1374 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1378 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1380 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1385 * Change stream state to CONFIGURED on first Slave add.
1386 * Bus is not aware of number of Slave(s) in a stream at this
1387 * point so cannot depend on all Slave(s) to be added in order to
1388 * change stream state to CONFIGURED.
1390 stream->state = SDW_STREAM_CONFIGURED;
1395 * we hit error so cleanup the stream, release all Slave(s) and
1398 sdw_release_master_stream(m_rt, stream);
1400 mutex_unlock(&slave->bus->bus_lock);
1403 EXPORT_SYMBOL(sdw_stream_add_slave);
1406 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1408 * @slave: Slave handle
1409 * @direction: Data direction.
1410 * @port_num: Port number
1412 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1413 enum sdw_data_direction direction,
1414 unsigned int port_num)
1416 struct sdw_dpn_prop *dpn_prop;
1420 if (direction == SDW_DATA_DIR_TX) {
1421 num_ports = hweight32(slave->prop.source_ports);
1422 dpn_prop = slave->prop.src_dpn_prop;
1424 num_ports = hweight32(slave->prop.sink_ports);
1425 dpn_prop = slave->prop.sink_dpn_prop;
1428 for (i = 0; i < num_ports; i++) {
1429 if (dpn_prop[i].num == port_num)
1430 return &dpn_prop[i];
1437 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1439 * @stream: SoundWire stream
1441 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1442 * stream to reconfigure the bus.
1443 * NOTE: This function is called from SoundWire stream ops and is
1444 * expected that a global lock is held before acquiring bus_lock.
1446 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1448 struct sdw_master_runtime *m_rt;
1449 struct sdw_bus *bus = NULL;
1451 /* Iterate for all Master(s) in Master list */
1452 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1455 mutex_lock(&bus->bus_lock);
1460 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1462 * @stream: SoundWire stream
1464 * Release the previously held bus_lock after reconfiguring the bus.
1465 * NOTE: This function is called from SoundWire stream ops and is
1466 * expected that a global lock is held before releasing bus_lock.
1468 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1470 struct sdw_master_runtime *m_rt = NULL;
1471 struct sdw_bus *bus = NULL;
1473 /* Iterate for all Master(s) in Master list */
1474 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1476 mutex_unlock(&bus->bus_lock);
1480 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1483 struct sdw_master_runtime *m_rt;
1484 struct sdw_bus *bus = NULL;
1485 struct sdw_master_prop *prop;
1486 struct sdw_bus_params params;
1489 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1490 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1493 memcpy(¶ms, &bus->params, sizeof(params));
1495 /* TODO: Support Asynchronous mode */
1496 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1497 dev_err(bus->dev, "Async mode not supported\n");
1502 goto program_params;
1504 /* Increment cumulative bus bandwidth */
1505 /* TODO: Update this during Device-Device support */
1506 bus->params.bandwidth += m_rt->stream->params.rate *
1507 m_rt->ch_count * m_rt->stream->params.bps;
1509 /* Compute params */
1510 if (bus->compute_params) {
1511 ret = bus->compute_params(bus);
1513 dev_err(bus->dev, "Compute params failed: %d",
1520 /* Program params */
1521 ret = sdw_program_params(bus, true);
1523 dev_err(bus->dev, "Program params failed: %d\n", ret);
1524 goto restore_params;
1529 pr_err("Configuration error in %s\n", __func__);
1533 ret = do_bank_switch(stream);
1535 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1536 goto restore_params;
1539 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1542 /* Prepare port(s) on the new clock configuration */
1543 ret = sdw_prep_deprep_ports(m_rt, true);
1545 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1551 stream->state = SDW_STREAM_PREPARED;
1556 memcpy(&bus->params, ¶ms, sizeof(params));
1561 * sdw_prepare_stream() - Prepare SoundWire stream
1563 * @stream: Soundwire stream
1565 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1567 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1569 bool update_params = true;
1573 pr_err("SoundWire: Handle not found for stream\n");
1577 sdw_acquire_bus_lock(stream);
1579 if (stream->state == SDW_STREAM_PREPARED) {
1584 if (stream->state != SDW_STREAM_CONFIGURED &&
1585 stream->state != SDW_STREAM_DEPREPARED &&
1586 stream->state != SDW_STREAM_DISABLED) {
1587 pr_err("%s: %s: inconsistent state state %d\n",
1588 __func__, stream->name, stream->state);
1594 * when the stream is DISABLED, this means sdw_prepare_stream()
1595 * is called as a result of an underflow or a resume operation.
1596 * In this case, the bus parameters shall not be recomputed, but
1597 * still need to be re-applied
1599 if (stream->state == SDW_STREAM_DISABLED)
1600 update_params = false;
1602 ret = _sdw_prepare_stream(stream, update_params);
1605 sdw_release_bus_lock(stream);
1608 EXPORT_SYMBOL(sdw_prepare_stream);
1610 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1612 struct sdw_master_runtime *m_rt;
1613 struct sdw_bus *bus = NULL;
1616 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1617 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1620 /* Program params */
1621 ret = sdw_program_params(bus, false);
1623 dev_err(bus->dev, "Program params failed: %d\n", ret);
1627 /* Enable port(s) */
1628 ret = sdw_enable_disable_ports(m_rt, true);
1631 "Enable port(s) failed ret: %d\n", ret);
1637 pr_err("Configuration error in %s\n", __func__);
1641 ret = do_bank_switch(stream);
1643 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1647 stream->state = SDW_STREAM_ENABLED;
1652 * sdw_enable_stream() - Enable SoundWire stream
1654 * @stream: Soundwire stream
1656 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1658 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1663 pr_err("SoundWire: Handle not found for stream\n");
1667 sdw_acquire_bus_lock(stream);
1669 if (stream->state != SDW_STREAM_PREPARED &&
1670 stream->state != SDW_STREAM_DISABLED) {
1671 pr_err("%s: %s: inconsistent state state %d\n",
1672 __func__, stream->name, stream->state);
1677 ret = _sdw_enable_stream(stream);
1680 sdw_release_bus_lock(stream);
1683 EXPORT_SYMBOL(sdw_enable_stream);
1685 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1687 struct sdw_master_runtime *m_rt;
1690 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1691 struct sdw_bus *bus = m_rt->bus;
1693 /* Disable port(s) */
1694 ret = sdw_enable_disable_ports(m_rt, false);
1696 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1700 stream->state = SDW_STREAM_DISABLED;
1702 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1703 struct sdw_bus *bus = m_rt->bus;
1705 /* Program params */
1706 ret = sdw_program_params(bus, false);
1708 dev_err(bus->dev, "Program params failed: %d\n", ret);
1713 ret = do_bank_switch(stream);
1715 pr_err("Bank switch failed: %d\n", ret);
1719 /* make sure alternate bank (previous current) is also disabled */
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);
1735 * sdw_disable_stream() - Disable SoundWire stream
1737 * @stream: Soundwire stream
1739 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1741 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1746 pr_err("SoundWire: Handle not found for stream\n");
1750 sdw_acquire_bus_lock(stream);
1752 if (stream->state != SDW_STREAM_ENABLED) {
1753 pr_err("%s: %s: inconsistent state state %d\n",
1754 __func__, stream->name, stream->state);
1759 ret = _sdw_disable_stream(stream);
1762 sdw_release_bus_lock(stream);
1765 EXPORT_SYMBOL(sdw_disable_stream);
1767 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1769 struct sdw_master_runtime *m_rt;
1770 struct sdw_bus *bus;
1773 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1775 /* De-prepare port(s) */
1776 ret = sdw_prep_deprep_ports(m_rt, false);
1779 "De-prepare port(s) failed: %d\n", ret);
1783 /* TODO: Update this during Device-Device support */
1784 bus->params.bandwidth -= m_rt->stream->params.rate *
1785 m_rt->ch_count * m_rt->stream->params.bps;
1787 /* Program params */
1788 ret = sdw_program_params(bus, false);
1790 dev_err(bus->dev, "Program params failed: %d\n", ret);
1795 stream->state = SDW_STREAM_DEPREPARED;
1796 return do_bank_switch(stream);
1800 * sdw_deprepare_stream() - Deprepare SoundWire stream
1802 * @stream: Soundwire stream
1804 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1806 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1811 pr_err("SoundWire: Handle not found for stream\n");
1815 sdw_acquire_bus_lock(stream);
1817 if (stream->state != SDW_STREAM_PREPARED &&
1818 stream->state != SDW_STREAM_DISABLED) {
1819 pr_err("%s: %s: inconsistent state state %d\n",
1820 __func__, stream->name, stream->state);
1825 ret = _sdw_deprepare_stream(stream);
1828 sdw_release_bus_lock(stream);
1831 EXPORT_SYMBOL(sdw_deprepare_stream);
1833 static int set_stream(struct snd_pcm_substream *substream,
1834 struct sdw_stream_runtime *sdw_stream)
1836 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1837 struct snd_soc_dai *dai;
1841 /* Set stream pointer on all DAIs */
1842 for_each_rtd_dais(rtd, i, dai) {
1843 ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
1845 dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name);
1854 * sdw_startup_stream() - Startup SoundWire stream
1856 * @sdw_substream: Soundwire stream
1858 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1860 int sdw_startup_stream(void *sdw_substream)
1862 struct snd_pcm_substream *substream = sdw_substream;
1863 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1864 struct sdw_stream_runtime *sdw_stream;
1868 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1869 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1871 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1876 sdw_stream = sdw_alloc_stream(name);
1878 dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name);
1883 ret = set_stream(substream, sdw_stream);
1885 goto release_stream;
1889 sdw_release_stream(sdw_stream);
1890 set_stream(substream, NULL);
1895 EXPORT_SYMBOL(sdw_startup_stream);
1898 * sdw_shutdown_stream() - Shutdown SoundWire stream
1900 * @sdw_substream: Soundwire stream
1902 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1904 void sdw_shutdown_stream(void *sdw_substream)
1906 struct snd_pcm_substream *substream = sdw_substream;
1907 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1908 struct sdw_stream_runtime *sdw_stream;
1909 struct snd_soc_dai *dai;
1911 /* Find stream from first CPU DAI */
1912 dai = asoc_rtd_to_cpu(rtd, 0);
1914 sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
1917 dev_err(rtd->dev, "no stream found for DAI %s", dai->name);
1921 /* release memory */
1922 kfree(sdw_stream->name);
1923 sdw_release_stream(sdw_stream);
1925 /* clear DAI data */
1926 set_stream(substream, NULL);
1928 EXPORT_SYMBOL(sdw_shutdown_stream);