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};
28 EXPORT_SYMBOL(sdw_rows);
30 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
31 EXPORT_SYMBOL(sdw_cols);
33 int sdw_find_col_index(int col)
37 for (i = 0; i < SDW_FRAME_COLS; i++) {
38 if (sdw_cols[i] == col)
42 pr_warn("Requested column not found, selecting lowest column no: 2\n");
45 EXPORT_SYMBOL(sdw_find_col_index);
47 int sdw_find_row_index(int row)
51 for (i = 0; i < SDW_FRAME_ROWS; i++) {
52 if (sdw_rows[i] == row)
56 pr_warn("Requested row not found, selecting lowest row no: 48\n");
59 EXPORT_SYMBOL(sdw_find_row_index);
61 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
62 struct sdw_slave *slave,
63 struct sdw_transport_params *t_params,
64 enum sdw_dpn_type type)
66 u32 addr1, addr2, addr3, addr4;
70 if (bus->params.next_bank) {
71 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
72 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
73 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
74 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
76 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
77 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
78 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
79 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
82 /* Program DPN_OffsetCtrl2 registers */
83 ret = sdw_write(slave, addr1, t_params->offset2);
85 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
89 /* Program DPN_BlockCtrl3 register */
90 ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
92 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
97 * Data ports are FULL, SIMPLE and REDUCED. This function handles
98 * FULL and REDUCED only and beyond this point only FULL is
99 * handled, so bail out if we are not FULL data port type
101 if (type != SDW_DPN_FULL)
104 /* Program DPN_SampleCtrl2 register */
105 wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
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 = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
115 wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
117 ret = sdw_write(slave, addr4, wbuf);
119 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
124 static int sdw_program_slave_port_params(struct sdw_bus *bus,
125 struct sdw_slave_runtime *s_rt,
126 struct sdw_port_runtime *p_rt)
128 struct sdw_transport_params *t_params = &p_rt->transport_params;
129 struct sdw_port_params *p_params = &p_rt->port_params;
130 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
131 u32 addr1, addr2, addr3, addr4, addr5, addr6;
132 struct sdw_dpn_prop *dpn_prop;
136 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
142 addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
143 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
145 if (bus->params.next_bank) {
146 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
147 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
148 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
149 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
152 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
153 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
154 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
155 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
158 /* Program DPN_PortCtrl register */
159 wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
160 wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
162 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
164 dev_err(&s_rt->slave->dev,
165 "DPN_PortCtrl register write failed for port %d\n",
170 if (!dpn_prop->read_only_wordlength) {
171 /* Program DPN_BlockCtrl1 register */
172 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
174 dev_err(&s_rt->slave->dev,
175 "DPN_BlockCtrl1 register write failed for port %d\n",
181 /* Program DPN_SampleCtrl1 register */
182 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
183 ret = sdw_write(s_rt->slave, addr3, wbuf);
185 dev_err(&s_rt->slave->dev,
186 "DPN_SampleCtrl1 register write failed for port %d\n",
191 /* Program DPN_OffsetCtrl1 registers */
192 ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
194 dev_err(&s_rt->slave->dev,
195 "DPN_OffsetCtrl1 register write failed for port %d\n",
200 /* Program DPN_BlockCtrl2 register*/
201 if (t_params->blk_grp_ctrl_valid) {
202 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
204 dev_err(&s_rt->slave->dev,
205 "DPN_BlockCtrl2 reg write failed for port %d\n",
211 /* program DPN_LaneCtrl register */
212 if (slave_prop->lane_control_support) {
213 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
215 dev_err(&s_rt->slave->dev,
216 "DPN_LaneCtrl register write failed for port %d\n",
222 if (dpn_prop->type != SDW_DPN_SIMPLE) {
223 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
224 t_params, dpn_prop->type);
226 dev_err(&s_rt->slave->dev,
227 "Transport reg write failed for port: %d\n",
234 static int sdw_program_master_port_params(struct sdw_bus *bus,
235 struct sdw_port_runtime *p_rt)
240 * we need to set transport and port parameters for the port.
241 * Transport parameters refers to the sample interval, offsets and
242 * hstart/stop etc of the data. Port parameters refers to word
243 * length, flow mode etc of the port
245 ret = bus->port_ops->dpn_set_port_transport_params(bus,
246 &p_rt->transport_params,
247 bus->params.next_bank);
251 return bus->port_ops->dpn_set_port_params(bus,
253 bus->params.next_bank);
257 * sdw_program_port_params() - Programs transport parameters of Master(s)
260 * @m_rt: Master stream runtime
262 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
264 struct sdw_slave_runtime *s_rt = NULL;
265 struct sdw_bus *bus = m_rt->bus;
266 struct sdw_port_runtime *p_rt;
269 /* Program transport & port parameters for Slave(s) */
270 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
271 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
272 ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
278 /* Program transport & port parameters for Master(s) */
279 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
280 ret = sdw_program_master_port_params(bus, p_rt);
289 * sdw_enable_disable_slave_ports: Enable/disable slave data port
292 * @s_rt: slave runtime
293 * @p_rt: port runtime
294 * @en: enable or disable operation
296 * This function only sets the enable/disable bits in the relevant bank, the
297 * actual enable/disable is done with a bank switch
299 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
300 struct sdw_slave_runtime *s_rt,
301 struct sdw_port_runtime *p_rt,
304 struct sdw_transport_params *t_params = &p_rt->transport_params;
308 if (bus->params.next_bank)
309 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
311 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
314 * Since bus doesn't support sharing a port across two streams,
315 * it is safe to reset this register
318 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
320 ret = sdw_write(s_rt->slave, addr, 0x0);
323 dev_err(&s_rt->slave->dev,
324 "Slave chn_en reg write failed:%d port:%d\n",
325 ret, t_params->port_num);
330 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
331 struct sdw_port_runtime *p_rt,
334 struct sdw_transport_params *t_params = &p_rt->transport_params;
335 struct sdw_bus *bus = m_rt->bus;
336 struct sdw_enable_ch enable_ch;
339 enable_ch.port_num = p_rt->num;
340 enable_ch.ch_mask = p_rt->ch_mask;
341 enable_ch.enable = en;
343 /* Perform Master port channel(s) enable/disable */
344 if (bus->port_ops->dpn_port_enable_ch) {
345 ret = bus->port_ops->dpn_port_enable_ch(bus,
347 bus->params.next_bank);
350 "Master chn_en write failed:%d port:%d\n",
351 ret, t_params->port_num);
356 "dpn_port_enable_ch not supported, %s failed\n",
357 en ? "enable" : "disable");
365 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
368 * @m_rt: Master stream runtime
369 * @en: mode (enable/disable)
371 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
373 struct sdw_port_runtime *s_port, *m_port;
374 struct sdw_slave_runtime *s_rt;
377 /* Enable/Disable Slave port(s) */
378 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
379 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
380 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
387 /* Enable/Disable Master port(s) */
388 list_for_each_entry(m_port, &m_rt->port_list, port_node) {
389 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
397 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
398 struct sdw_prepare_ch prep_ch,
399 enum sdw_port_prep_ops cmd)
401 const struct sdw_slave_ops *ops = s_rt->slave->ops;
404 if (ops->port_prep) {
405 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
407 dev_err(&s_rt->slave->dev,
408 "Slave Port Prep cmd %d failed: %d\n",
417 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
418 struct sdw_slave_runtime *s_rt,
419 struct sdw_port_runtime *p_rt,
422 struct completion *port_ready;
423 struct sdw_dpn_prop *dpn_prop;
424 struct sdw_prepare_ch prep_ch;
429 prep_ch.num = p_rt->num;
430 prep_ch.ch_mask = p_rt->ch_mask;
432 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
437 "Slave Port:%d properties not found\n", prep_ch.num);
441 prep_ch.prepare = prep;
443 prep_ch.bank = bus->params.next_bank;
445 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
446 bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
450 * Enable interrupt before Port prepare.
451 * For Port de-prepare, it is assumed that port
452 * was prepared earlier
455 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
456 dpn_prop->imp_def_interrupts);
461 /* Inform slave about the impending port prepare */
462 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
464 /* Prepare Slave port implementing CP_SM */
465 if (!dpn_prop->simple_ch_prep_sm) {
466 addr = SDW_DPN_PREPARECTRL(p_rt->num);
469 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
471 ret = sdw_write(s_rt->slave, addr, 0x0);
474 dev_err(&s_rt->slave->dev,
475 "Slave prep_ctrl reg write failed\n");
479 /* Wait for completion on port ready */
480 port_ready = &s_rt->slave->port_ready[prep_ch.num];
481 wait_for_completion_timeout(port_ready,
482 msecs_to_jiffies(dpn_prop->ch_prep_timeout));
484 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
485 if ((val < 0) || (val & p_rt->ch_mask)) {
486 ret = (val < 0) ? val : -ETIMEDOUT;
487 dev_err(&s_rt->slave->dev,
488 "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
493 /* Inform slaves about ports prepared */
494 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
496 /* Disable interrupt after Port de-prepare */
498 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
499 dpn_prop->imp_def_interrupts);
504 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
505 struct sdw_port_runtime *p_rt,
508 struct sdw_transport_params *t_params = &p_rt->transport_params;
509 struct sdw_bus *bus = m_rt->bus;
510 const struct sdw_master_port_ops *ops = bus->port_ops;
511 struct sdw_prepare_ch prep_ch;
514 prep_ch.num = p_rt->num;
515 prep_ch.ch_mask = p_rt->ch_mask;
516 prep_ch.prepare = prep; /* Prepare/De-prepare */
517 prep_ch.bank = bus->params.next_bank;
519 /* Pre-prepare/Pre-deprepare port(s) */
520 if (ops->dpn_port_prep) {
521 ret = ops->dpn_port_prep(bus, &prep_ch);
523 dev_err(bus->dev, "Port prepare failed for port:%d\n",
533 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
536 * @m_rt: Master runtime handle
537 * @prep: Prepare or De-prepare
539 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
541 struct sdw_slave_runtime *s_rt;
542 struct sdw_port_runtime *p_rt;
545 /* Prepare/De-prepare Slave port(s) */
546 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
547 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
548 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
555 /* Prepare/De-prepare Master port(s) */
556 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
557 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
566 * sdw_notify_config() - Notify bus configuration
568 * @m_rt: Master runtime handle
570 * This function notifies the Master(s) and Slave(s) of the
571 * new bus configuration.
573 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
575 struct sdw_slave_runtime *s_rt;
576 struct sdw_bus *bus = m_rt->bus;
577 struct sdw_slave *slave;
580 if (bus->ops->set_bus_conf) {
581 ret = bus->ops->set_bus_conf(bus, &bus->params);
586 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
589 if (slave->ops->bus_config) {
590 ret = slave->ops->bus_config(slave, &bus->params);
592 dev_err(bus->dev, "Notify Slave: %d failed\n",
603 * sdw_program_params() - Program transport and port parameters for Master(s)
606 * @bus: SDW bus instance
607 * @prepare: true if sdw_program_params() is called by _prepare.
609 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
611 struct sdw_master_runtime *m_rt;
614 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
617 * this loop walks through all master runtimes for a
618 * bus, but the ports can only be configured while
619 * explicitly preparing a stream or handling an
620 * already-prepared stream otherwise.
623 m_rt->stream->state == SDW_STREAM_CONFIGURED)
626 ret = sdw_program_port_params(m_rt);
629 "Program transport params failed: %d\n", ret);
633 ret = sdw_notify_config(m_rt);
636 "Notify bus config failed: %d\n", ret);
640 /* Enable port(s) on alternate bank for all active streams */
641 if (m_rt->stream->state != SDW_STREAM_ENABLED)
644 ret = sdw_enable_disable_ports(m_rt, true);
646 dev_err(bus->dev, "Enable channel failed: %d\n", ret);
654 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
656 int col_index, row_index;
658 struct sdw_msg *wr_msg;
663 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
667 bus->defer_msg.msg = wr_msg;
669 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
675 /* Get row and column index to program register */
676 col_index = sdw_find_col_index(bus->params.col);
677 row_index = sdw_find_row_index(bus->params.row);
678 wbuf[0] = col_index | (row_index << 3);
680 if (bus->params.next_bank)
681 addr = SDW_SCP_FRAMECTRL_B1;
683 addr = SDW_SCP_FRAMECTRL_B0;
685 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
686 SDW_MSG_FLAG_WRITE, wbuf);
687 wr_msg->ssp_sync = true;
690 * Set the multi_link flag only when both the hardware supports
691 * and hardware-based sync is required
693 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
696 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
698 ret = sdw_transfer(bus, wr_msg);
701 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
708 bus->defer_msg.msg = NULL;
709 bus->params.curr_bank = !bus->params.curr_bank;
710 bus->params.next_bank = !bus->params.next_bank;
719 bus->defer_msg.msg = NULL;
724 * sdw_ml_sync_bank_switch: Multilink register bank switch
726 * @bus: SDW bus instance
728 * Caller function should free the buffers on error
730 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
732 unsigned long time_left;
734 if (!bus->multi_link)
737 /* Wait for completion of transfer */
738 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
739 bus->bank_switch_timeout);
742 dev_err(bus->dev, "Controller Timed out on bank switch\n");
746 bus->params.curr_bank = !bus->params.curr_bank;
747 bus->params.next_bank = !bus->params.next_bank;
749 if (bus->defer_msg.msg) {
750 kfree(bus->defer_msg.msg->buf);
751 kfree(bus->defer_msg.msg);
757 static int do_bank_switch(struct sdw_stream_runtime *stream)
759 struct sdw_master_runtime *m_rt;
760 const struct sdw_master_ops *ops;
762 bool multi_link = false;
766 m_rt_count = stream->m_rt_count;
768 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
772 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
774 mutex_lock(&bus->msg_lock);
777 /* Pre-bank switch */
778 if (ops->pre_bank_switch) {
779 ret = ops->pre_bank_switch(bus);
782 "Pre bank switch op failed: %d\n", ret);
788 * Perform Bank switch operation.
789 * For multi link cases, the actual bank switch is
790 * synchronized across all Masters and happens later as a
791 * part of post_bank_switch ops.
793 ret = sdw_bank_switch(bus, m_rt_count);
795 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
801 * For multi link cases, it is expected that the bank switch is
802 * triggered by the post_bank_switch for the first Master in the list
803 * and for the other Masters the post_bank_switch() should return doing
806 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
810 /* Post-bank switch */
811 if (ops->post_bank_switch) {
812 ret = ops->post_bank_switch(bus);
815 "Post bank switch op failed: %d\n",
819 } else if (multi_link) {
821 "Post bank switch ops not implemented\n");
825 /* Set the bank switch timeout to default, if not set */
826 if (!bus->bank_switch_timeout)
827 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
829 /* Check if bank switch was successful */
830 ret = sdw_ml_sync_bank_switch(bus);
833 "multi link bank switch failed: %d\n", ret);
838 mutex_unlock(&bus->msg_lock);
844 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
846 if (bus->defer_msg.msg) {
847 kfree(bus->defer_msg.msg->buf);
848 kfree(bus->defer_msg.msg);
855 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
857 if (mutex_is_locked(&bus->msg_lock))
858 mutex_unlock(&bus->msg_lock);
866 * sdw_release_stream() - Free the assigned stream runtime
868 * @stream: SoundWire stream runtime
870 * sdw_release_stream should be called only once per stream
872 void sdw_release_stream(struct sdw_stream_runtime *stream)
876 EXPORT_SYMBOL(sdw_release_stream);
879 * sdw_alloc_stream() - Allocate and return stream runtime
881 * @stream_name: SoundWire stream name
883 * Allocates a SoundWire stream runtime instance.
884 * sdw_alloc_stream should be called only once per stream. Typically
885 * invoked from ALSA/ASoC machine/platform driver.
887 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
889 struct sdw_stream_runtime *stream;
891 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
895 stream->name = stream_name;
896 INIT_LIST_HEAD(&stream->master_list);
897 stream->state = SDW_STREAM_ALLOCATED;
898 stream->m_rt_count = 0;
902 EXPORT_SYMBOL(sdw_alloc_stream);
904 static struct sdw_master_runtime
905 *sdw_find_master_rt(struct sdw_bus *bus,
906 struct sdw_stream_runtime *stream)
908 struct sdw_master_runtime *m_rt;
910 /* Retrieve Bus handle if already available */
911 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
912 if (m_rt->bus == bus)
920 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
922 * @bus: SDW bus instance
923 * @stream_config: Stream configuration
924 * @stream: Stream runtime handle.
926 * This function is to be called with bus_lock held.
928 static struct sdw_master_runtime
929 *sdw_alloc_master_rt(struct sdw_bus *bus,
930 struct sdw_stream_config *stream_config,
931 struct sdw_stream_runtime *stream)
933 struct sdw_master_runtime *m_rt;
936 * check if Master is already allocated (as a result of Slave adding
937 * it first), if so skip allocation and go to configure
939 m_rt = sdw_find_master_rt(bus, stream);
943 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
947 /* Initialization of Master runtime handle */
948 INIT_LIST_HEAD(&m_rt->port_list);
949 INIT_LIST_HEAD(&m_rt->slave_rt_list);
950 list_add_tail(&m_rt->stream_node, &stream->master_list);
952 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
955 m_rt->ch_count = stream_config->ch_count;
957 m_rt->stream = stream;
958 m_rt->direction = stream_config->direction;
964 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
966 * @slave: Slave handle
967 * @stream_config: Stream configuration
968 * @stream: Stream runtime handle
970 * This function is to be called with bus_lock held.
972 static struct sdw_slave_runtime
973 *sdw_alloc_slave_rt(struct sdw_slave *slave,
974 struct sdw_stream_config *stream_config,
975 struct sdw_stream_runtime *stream)
977 struct sdw_slave_runtime *s_rt;
979 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
983 INIT_LIST_HEAD(&s_rt->port_list);
984 s_rt->ch_count = stream_config->ch_count;
985 s_rt->direction = stream_config->direction;
991 static void sdw_master_port_release(struct sdw_bus *bus,
992 struct sdw_master_runtime *m_rt)
994 struct sdw_port_runtime *p_rt, *_p_rt;
996 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
997 list_del(&p_rt->port_node);
1002 static void sdw_slave_port_release(struct sdw_bus *bus,
1003 struct sdw_slave *slave,
1004 struct sdw_stream_runtime *stream)
1006 struct sdw_port_runtime *p_rt, *_p_rt;
1007 struct sdw_master_runtime *m_rt;
1008 struct sdw_slave_runtime *s_rt;
1010 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1011 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1012 if (s_rt->slave != slave)
1015 list_for_each_entry_safe(p_rt, _p_rt,
1016 &s_rt->port_list, port_node) {
1017 list_del(&p_rt->port_node);
1025 * sdw_release_slave_stream() - Free Slave(s) runtime handle
1027 * @slave: Slave handle.
1028 * @stream: Stream runtime handle.
1030 * This function is to be called with bus_lock held.
1032 static void sdw_release_slave_stream(struct sdw_slave *slave,
1033 struct sdw_stream_runtime *stream)
1035 struct sdw_slave_runtime *s_rt, *_s_rt;
1036 struct sdw_master_runtime *m_rt;
1038 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1039 /* Retrieve Slave runtime handle */
1040 list_for_each_entry_safe(s_rt, _s_rt,
1041 &m_rt->slave_rt_list, m_rt_node) {
1042 if (s_rt->slave == slave) {
1043 list_del(&s_rt->m_rt_node);
1052 * sdw_release_master_stream() - Free Master runtime handle
1054 * @m_rt: Master runtime node
1055 * @stream: Stream runtime handle.
1057 * This function is to be called with bus_lock held
1058 * It frees the Master runtime handle and associated Slave(s) runtime
1059 * handle. If this is called first then sdw_release_slave_stream() will have
1060 * no effect as Slave(s) runtime handle would already be freed up.
1062 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1063 struct sdw_stream_runtime *stream)
1065 struct sdw_slave_runtime *s_rt, *_s_rt;
1067 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1068 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1069 sdw_release_slave_stream(s_rt->slave, stream);
1072 list_del(&m_rt->stream_node);
1073 list_del(&m_rt->bus_node);
1078 * sdw_stream_remove_master() - Remove master from sdw_stream
1080 * @bus: SDW Bus instance
1081 * @stream: SoundWire stream
1083 * This removes and frees port_rt and master_rt from a stream
1085 int sdw_stream_remove_master(struct sdw_bus *bus,
1086 struct sdw_stream_runtime *stream)
1088 struct sdw_master_runtime *m_rt, *_m_rt;
1090 mutex_lock(&bus->bus_lock);
1092 list_for_each_entry_safe(m_rt, _m_rt,
1093 &stream->master_list, stream_node) {
1094 if (m_rt->bus != bus)
1097 sdw_master_port_release(bus, m_rt);
1098 sdw_release_master_stream(m_rt, stream);
1099 stream->m_rt_count--;
1102 if (list_empty(&stream->master_list))
1103 stream->state = SDW_STREAM_RELEASED;
1105 mutex_unlock(&bus->bus_lock);
1109 EXPORT_SYMBOL(sdw_stream_remove_master);
1112 * sdw_stream_remove_slave() - Remove slave from sdw_stream
1114 * @slave: SDW Slave instance
1115 * @stream: SoundWire stream
1117 * This removes and frees port_rt and slave_rt from a stream
1119 int sdw_stream_remove_slave(struct sdw_slave *slave,
1120 struct sdw_stream_runtime *stream)
1122 mutex_lock(&slave->bus->bus_lock);
1124 sdw_slave_port_release(slave->bus, slave, stream);
1125 sdw_release_slave_stream(slave, stream);
1127 mutex_unlock(&slave->bus->bus_lock);
1131 EXPORT_SYMBOL(sdw_stream_remove_slave);
1134 * sdw_config_stream() - Configure the allocated stream
1137 * @stream: SoundWire stream
1138 * @stream_config: Stream configuration for audio stream
1139 * @is_slave: is API called from Slave or Master
1141 * This function is to be called with bus_lock held.
1143 static int sdw_config_stream(struct device *dev,
1144 struct sdw_stream_runtime *stream,
1145 struct sdw_stream_config *stream_config,
1149 * Update the stream rate, channel and bps based on data
1150 * source. For more than one data source (multilink),
1151 * match the rate, bps, stream type and increment number of channels.
1153 * If rate/bps is zero, it means the values are not set, so skip
1154 * comparison and allow the value to be set and stored in stream
1156 if (stream->params.rate &&
1157 stream->params.rate != stream_config->frame_rate) {
1158 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1162 if (stream->params.bps &&
1163 stream->params.bps != stream_config->bps) {
1164 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1168 stream->type = stream_config->type;
1169 stream->params.rate = stream_config->frame_rate;
1170 stream->params.bps = stream_config->bps;
1172 /* TODO: Update this check during Device-device support */
1174 stream->params.ch_count += stream_config->ch_count;
1179 static int sdw_is_valid_port_range(struct device *dev,
1180 struct sdw_port_runtime *p_rt)
1182 if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1184 "SoundWire: Invalid port number :%d\n", p_rt->num);
1191 static struct sdw_port_runtime
1192 *sdw_port_alloc(struct device *dev,
1193 struct sdw_port_config *port_config,
1196 struct sdw_port_runtime *p_rt;
1198 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1202 p_rt->ch_mask = port_config[port_index].ch_mask;
1203 p_rt->num = port_config[port_index].num;
1208 static int sdw_master_port_config(struct sdw_bus *bus,
1209 struct sdw_master_runtime *m_rt,
1210 struct sdw_port_config *port_config,
1211 unsigned int num_ports)
1213 struct sdw_port_runtime *p_rt;
1216 /* Iterate for number of ports to perform initialization */
1217 for (i = 0; i < num_ports; i++) {
1218 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1223 * TODO: Check port capabilities for requested
1224 * configuration (audio mode support)
1227 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1233 static int sdw_slave_port_config(struct sdw_slave *slave,
1234 struct sdw_slave_runtime *s_rt,
1235 struct sdw_port_config *port_config,
1236 unsigned int num_config)
1238 struct sdw_port_runtime *p_rt;
1241 /* Iterate for number of ports to perform initialization */
1242 for (i = 0; i < num_config; i++) {
1243 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1248 * TODO: Check valid port range as defined by DisCo/
1251 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1258 * TODO: Check port capabilities for requested
1259 * configuration (audio mode support)
1262 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1269 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1271 * @bus: SDW Bus instance
1272 * @stream_config: Stream configuration for audio stream
1273 * @port_config: Port configuration for audio stream
1274 * @num_ports: Number of ports
1275 * @stream: SoundWire stream
1277 int sdw_stream_add_master(struct sdw_bus *bus,
1278 struct sdw_stream_config *stream_config,
1279 struct sdw_port_config *port_config,
1280 unsigned int num_ports,
1281 struct sdw_stream_runtime *stream)
1283 struct sdw_master_runtime *m_rt;
1286 mutex_lock(&bus->bus_lock);
1289 * For multi link streams, add the second master only if
1290 * the bus supports it.
1291 * Check if bus->multi_link is set
1293 if (!bus->multi_link && stream->m_rt_count > 0) {
1295 "Multilink not supported, link %d\n", bus->link_id);
1300 m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1303 "Master runtime config failed for stream:%s\n",
1309 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1313 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1317 stream->m_rt_count++;
1322 sdw_release_master_stream(m_rt, stream);
1324 mutex_unlock(&bus->bus_lock);
1327 EXPORT_SYMBOL(sdw_stream_add_master);
1330 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1332 * @slave: SDW Slave instance
1333 * @stream_config: Stream configuration for audio stream
1334 * @stream: SoundWire stream
1335 * @port_config: Port configuration for audio stream
1336 * @num_ports: Number of ports
1338 * It is expected that Slave is added before adding Master
1342 int sdw_stream_add_slave(struct sdw_slave *slave,
1343 struct sdw_stream_config *stream_config,
1344 struct sdw_port_config *port_config,
1345 unsigned int num_ports,
1346 struct sdw_stream_runtime *stream)
1348 struct sdw_slave_runtime *s_rt;
1349 struct sdw_master_runtime *m_rt;
1352 mutex_lock(&slave->bus->bus_lock);
1355 * If this API is invoked by Slave first then m_rt is not valid.
1356 * So, allocate m_rt and add Slave to it.
1358 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1360 dev_err(&slave->dev,
1361 "alloc master runtime failed for stream:%s\n",
1367 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1369 dev_err(&slave->dev,
1370 "Slave runtime config failed for stream:%s\n",
1376 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1379 * sdw_release_master_stream will release s_rt in slave_rt_list in
1380 * stream_error case, but s_rt is only added to slave_rt_list
1381 * when sdw_config_stream is successful, so free s_rt explicitly
1382 * when sdw_config_stream is failed.
1388 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1390 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1395 * Change stream state to CONFIGURED on first Slave add.
1396 * Bus is not aware of number of Slave(s) in a stream at this
1397 * point so cannot depend on all Slave(s) to be added in order to
1398 * change stream state to CONFIGURED.
1400 stream->state = SDW_STREAM_CONFIGURED;
1405 * we hit error so cleanup the stream, release all Slave(s) and
1408 sdw_release_master_stream(m_rt, stream);
1410 mutex_unlock(&slave->bus->bus_lock);
1413 EXPORT_SYMBOL(sdw_stream_add_slave);
1416 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1418 * @slave: Slave handle
1419 * @direction: Data direction.
1420 * @port_num: Port number
1422 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1423 enum sdw_data_direction direction,
1424 unsigned int port_num)
1426 struct sdw_dpn_prop *dpn_prop;
1430 if (direction == SDW_DATA_DIR_TX) {
1431 num_ports = hweight32(slave->prop.source_ports);
1432 dpn_prop = slave->prop.src_dpn_prop;
1434 num_ports = hweight32(slave->prop.sink_ports);
1435 dpn_prop = slave->prop.sink_dpn_prop;
1438 for (i = 0; i < num_ports; i++) {
1439 if (dpn_prop[i].num == port_num)
1440 return &dpn_prop[i];
1447 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1449 * @stream: SoundWire stream
1451 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1452 * stream to reconfigure the bus.
1453 * NOTE: This function is called from SoundWire stream ops and is
1454 * expected that a global lock is held before acquiring bus_lock.
1456 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1458 struct sdw_master_runtime *m_rt;
1459 struct sdw_bus *bus = NULL;
1461 /* Iterate for all Master(s) in Master list */
1462 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1465 mutex_lock(&bus->bus_lock);
1470 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1472 * @stream: SoundWire stream
1474 * Release the previously held bus_lock after reconfiguring the bus.
1475 * NOTE: This function is called from SoundWire stream ops and is
1476 * expected that a global lock is held before releasing bus_lock.
1478 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1480 struct sdw_master_runtime *m_rt = NULL;
1481 struct sdw_bus *bus = NULL;
1483 /* Iterate for all Master(s) in Master list */
1484 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1486 mutex_unlock(&bus->bus_lock);
1490 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1493 struct sdw_master_runtime *m_rt;
1494 struct sdw_bus *bus = NULL;
1495 struct sdw_master_prop *prop;
1496 struct sdw_bus_params params;
1499 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1500 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1503 memcpy(¶ms, &bus->params, sizeof(params));
1505 /* TODO: Support Asynchronous mode */
1506 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1507 dev_err(bus->dev, "Async mode not supported\n");
1512 goto program_params;
1514 /* Increment cumulative bus bandwidth */
1515 /* TODO: Update this during Device-Device support */
1516 bus->params.bandwidth += m_rt->stream->params.rate *
1517 m_rt->ch_count * m_rt->stream->params.bps;
1519 /* Compute params */
1520 if (bus->compute_params) {
1521 ret = bus->compute_params(bus);
1523 dev_err(bus->dev, "Compute params failed: %d",
1530 /* Program params */
1531 ret = sdw_program_params(bus, true);
1533 dev_err(bus->dev, "Program params failed: %d\n", ret);
1534 goto restore_params;
1539 pr_err("Configuration error in %s\n", __func__);
1543 ret = do_bank_switch(stream);
1545 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1546 goto restore_params;
1549 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1552 /* Prepare port(s) on the new clock configuration */
1553 ret = sdw_prep_deprep_ports(m_rt, true);
1555 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1561 stream->state = SDW_STREAM_PREPARED;
1566 memcpy(&bus->params, ¶ms, sizeof(params));
1571 * sdw_prepare_stream() - Prepare SoundWire stream
1573 * @stream: Soundwire stream
1575 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1577 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1579 bool update_params = true;
1583 pr_err("SoundWire: Handle not found for stream\n");
1587 sdw_acquire_bus_lock(stream);
1589 if (stream->state == SDW_STREAM_PREPARED) {
1594 if (stream->state != SDW_STREAM_CONFIGURED &&
1595 stream->state != SDW_STREAM_DEPREPARED &&
1596 stream->state != SDW_STREAM_DISABLED) {
1597 pr_err("%s: %s: inconsistent state state %d\n",
1598 __func__, stream->name, stream->state);
1604 * when the stream is DISABLED, this means sdw_prepare_stream()
1605 * is called as a result of an underflow or a resume operation.
1606 * In this case, the bus parameters shall not be recomputed, but
1607 * still need to be re-applied
1609 if (stream->state == SDW_STREAM_DISABLED)
1610 update_params = false;
1612 ret = _sdw_prepare_stream(stream, update_params);
1615 sdw_release_bus_lock(stream);
1618 EXPORT_SYMBOL(sdw_prepare_stream);
1620 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1622 struct sdw_master_runtime *m_rt;
1623 struct sdw_bus *bus = NULL;
1626 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1627 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1630 /* Program params */
1631 ret = sdw_program_params(bus, false);
1633 dev_err(bus->dev, "Program params failed: %d\n", ret);
1637 /* Enable port(s) */
1638 ret = sdw_enable_disable_ports(m_rt, true);
1641 "Enable port(s) failed ret: %d\n", ret);
1647 pr_err("Configuration error in %s\n", __func__);
1651 ret = do_bank_switch(stream);
1653 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1657 stream->state = SDW_STREAM_ENABLED;
1662 * sdw_enable_stream() - Enable SoundWire stream
1664 * @stream: Soundwire stream
1666 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1668 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1673 pr_err("SoundWire: Handle not found for stream\n");
1677 sdw_acquire_bus_lock(stream);
1679 if (stream->state != SDW_STREAM_PREPARED &&
1680 stream->state != SDW_STREAM_DISABLED) {
1681 pr_err("%s: %s: inconsistent state state %d\n",
1682 __func__, stream->name, stream->state);
1687 ret = _sdw_enable_stream(stream);
1690 sdw_release_bus_lock(stream);
1693 EXPORT_SYMBOL(sdw_enable_stream);
1695 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1697 struct sdw_master_runtime *m_rt;
1700 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1701 struct sdw_bus *bus = m_rt->bus;
1703 /* Disable port(s) */
1704 ret = sdw_enable_disable_ports(m_rt, false);
1706 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1710 stream->state = SDW_STREAM_DISABLED;
1712 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1713 struct sdw_bus *bus = m_rt->bus;
1715 /* Program params */
1716 ret = sdw_program_params(bus, false);
1718 dev_err(bus->dev, "Program params failed: %d\n", ret);
1723 ret = do_bank_switch(stream);
1725 pr_err("Bank switch failed: %d\n", ret);
1729 /* make sure alternate bank (previous current) is also disabled */
1730 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1731 struct sdw_bus *bus = m_rt->bus;
1733 /* Disable port(s) */
1734 ret = sdw_enable_disable_ports(m_rt, false);
1736 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1745 * sdw_disable_stream() - Disable SoundWire stream
1747 * @stream: Soundwire stream
1749 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1751 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1756 pr_err("SoundWire: Handle not found for stream\n");
1760 sdw_acquire_bus_lock(stream);
1762 if (stream->state != SDW_STREAM_ENABLED) {
1763 pr_err("%s: %s: inconsistent state state %d\n",
1764 __func__, stream->name, stream->state);
1769 ret = _sdw_disable_stream(stream);
1772 sdw_release_bus_lock(stream);
1775 EXPORT_SYMBOL(sdw_disable_stream);
1777 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1779 struct sdw_master_runtime *m_rt;
1780 struct sdw_bus *bus;
1783 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1785 /* De-prepare port(s) */
1786 ret = sdw_prep_deprep_ports(m_rt, false);
1789 "De-prepare port(s) failed: %d\n", ret);
1793 /* TODO: Update this during Device-Device support */
1794 bus->params.bandwidth -= m_rt->stream->params.rate *
1795 m_rt->ch_count * m_rt->stream->params.bps;
1797 /* Compute params */
1798 if (bus->compute_params) {
1799 ret = bus->compute_params(bus);
1801 dev_err(bus->dev, "Compute params failed: %d",
1807 /* Program params */
1808 ret = sdw_program_params(bus, false);
1810 dev_err(bus->dev, "Program params failed: %d\n", ret);
1815 stream->state = SDW_STREAM_DEPREPARED;
1816 return do_bank_switch(stream);
1820 * sdw_deprepare_stream() - Deprepare SoundWire stream
1822 * @stream: Soundwire stream
1824 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1826 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1831 pr_err("SoundWire: Handle not found for stream\n");
1835 sdw_acquire_bus_lock(stream);
1837 if (stream->state != SDW_STREAM_PREPARED &&
1838 stream->state != SDW_STREAM_DISABLED) {
1839 pr_err("%s: %s: inconsistent state state %d\n",
1840 __func__, stream->name, stream->state);
1845 ret = _sdw_deprepare_stream(stream);
1848 sdw_release_bus_lock(stream);
1851 EXPORT_SYMBOL(sdw_deprepare_stream);
1853 static int set_stream(struct snd_pcm_substream *substream,
1854 struct sdw_stream_runtime *sdw_stream)
1856 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1857 struct snd_soc_dai *dai;
1861 /* Set stream pointer on all DAIs */
1862 for_each_rtd_dais(rtd, i, dai) {
1863 ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
1865 dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name);
1874 * sdw_startup_stream() - Startup SoundWire stream
1876 * @sdw_substream: Soundwire stream
1878 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1880 int sdw_startup_stream(void *sdw_substream)
1882 struct snd_pcm_substream *substream = sdw_substream;
1883 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1884 struct sdw_stream_runtime *sdw_stream;
1888 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1889 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1891 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1896 sdw_stream = sdw_alloc_stream(name);
1898 dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name);
1903 ret = set_stream(substream, sdw_stream);
1905 goto release_stream;
1909 sdw_release_stream(sdw_stream);
1910 set_stream(substream, NULL);
1915 EXPORT_SYMBOL(sdw_startup_stream);
1918 * sdw_shutdown_stream() - Shutdown SoundWire stream
1920 * @sdw_substream: Soundwire stream
1922 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1924 void sdw_shutdown_stream(void *sdw_substream)
1926 struct snd_pcm_substream *substream = sdw_substream;
1927 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1928 struct sdw_stream_runtime *sdw_stream;
1929 struct snd_soc_dai *dai;
1931 /* Find stream from first CPU DAI */
1932 dai = asoc_rtd_to_cpu(rtd, 0);
1934 sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
1936 if (IS_ERR(sdw_stream)) {
1937 dev_err(rtd->dev, "no stream found for DAI %s", dai->name);
1941 /* release memory */
1942 kfree(sdw_stream->name);
1943 sdw_release_stream(sdw_stream);
1945 /* clear DAI data */
1946 set_stream(substream, NULL);
1948 EXPORT_SYMBOL(sdw_shutdown_stream);