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;
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;
765 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
769 if (bus->multi_link) {
771 mutex_lock(&bus->msg_lock);
774 /* Pre-bank switch */
775 if (ops->pre_bank_switch) {
776 ret = ops->pre_bank_switch(bus);
779 "Pre bank switch op failed: %d\n", ret);
785 * Perform Bank switch operation.
786 * For multi link cases, the actual bank switch is
787 * synchronized across all Masters and happens later as a
788 * part of post_bank_switch ops.
790 ret = sdw_bank_switch(bus, stream->m_rt_count);
792 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
798 * For multi link cases, it is expected that the bank switch is
799 * triggered by the post_bank_switch for the first Master in the list
800 * and for the other Masters the post_bank_switch() should return doing
803 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
807 /* Post-bank switch */
808 if (ops->post_bank_switch) {
809 ret = ops->post_bank_switch(bus);
812 "Post bank switch op failed: %d\n",
816 } else if (bus->multi_link && stream->m_rt_count > 1) {
818 "Post bank switch ops not implemented\n");
822 /* Set the bank switch timeout to default, if not set */
823 if (!bus->bank_switch_timeout)
824 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
826 /* Check if bank switch was successful */
827 ret = sdw_ml_sync_bank_switch(bus);
830 "multi link bank switch failed: %d\n", ret);
835 mutex_unlock(&bus->msg_lock);
841 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
844 kfree(bus->defer_msg.msg->buf);
845 kfree(bus->defer_msg.msg);
851 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
853 if (mutex_is_locked(&bus->msg_lock))
854 mutex_unlock(&bus->msg_lock);
862 * sdw_release_stream() - Free the assigned stream runtime
864 * @stream: SoundWire stream runtime
866 * sdw_release_stream should be called only once per stream
868 void sdw_release_stream(struct sdw_stream_runtime *stream)
872 EXPORT_SYMBOL(sdw_release_stream);
875 * sdw_alloc_stream() - Allocate and return stream runtime
877 * @stream_name: SoundWire stream name
879 * Allocates a SoundWire stream runtime instance.
880 * sdw_alloc_stream should be called only once per stream. Typically
881 * invoked from ALSA/ASoC machine/platform driver.
883 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
885 struct sdw_stream_runtime *stream;
887 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
891 stream->name = stream_name;
892 INIT_LIST_HEAD(&stream->master_list);
893 stream->state = SDW_STREAM_ALLOCATED;
894 stream->m_rt_count = 0;
898 EXPORT_SYMBOL(sdw_alloc_stream);
900 static struct sdw_master_runtime
901 *sdw_find_master_rt(struct sdw_bus *bus,
902 struct sdw_stream_runtime *stream)
904 struct sdw_master_runtime *m_rt;
906 /* Retrieve Bus handle if already available */
907 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
908 if (m_rt->bus == bus)
916 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
918 * @bus: SDW bus instance
919 * @stream_config: Stream configuration
920 * @stream: Stream runtime handle.
922 * This function is to be called with bus_lock held.
924 static struct sdw_master_runtime
925 *sdw_alloc_master_rt(struct sdw_bus *bus,
926 struct sdw_stream_config *stream_config,
927 struct sdw_stream_runtime *stream)
929 struct sdw_master_runtime *m_rt;
932 * check if Master is already allocated (as a result of Slave adding
933 * it first), if so skip allocation and go to configure
935 m_rt = sdw_find_master_rt(bus, stream);
939 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
943 /* Initialization of Master runtime handle */
944 INIT_LIST_HEAD(&m_rt->port_list);
945 INIT_LIST_HEAD(&m_rt->slave_rt_list);
946 list_add_tail(&m_rt->stream_node, &stream->master_list);
948 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
951 m_rt->ch_count = stream_config->ch_count;
953 m_rt->stream = stream;
954 m_rt->direction = stream_config->direction;
960 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
962 * @slave: Slave handle
963 * @stream_config: Stream configuration
964 * @stream: Stream runtime handle
966 * This function is to be called with bus_lock held.
968 static struct sdw_slave_runtime
969 *sdw_alloc_slave_rt(struct sdw_slave *slave,
970 struct sdw_stream_config *stream_config,
971 struct sdw_stream_runtime *stream)
973 struct sdw_slave_runtime *s_rt;
975 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
979 INIT_LIST_HEAD(&s_rt->port_list);
980 s_rt->ch_count = stream_config->ch_count;
981 s_rt->direction = stream_config->direction;
987 static void sdw_master_port_release(struct sdw_bus *bus,
988 struct sdw_master_runtime *m_rt)
990 struct sdw_port_runtime *p_rt, *_p_rt;
992 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
993 list_del(&p_rt->port_node);
998 static void sdw_slave_port_release(struct sdw_bus *bus,
999 struct sdw_slave *slave,
1000 struct sdw_stream_runtime *stream)
1002 struct sdw_port_runtime *p_rt, *_p_rt;
1003 struct sdw_master_runtime *m_rt;
1004 struct sdw_slave_runtime *s_rt;
1006 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1007 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1008 if (s_rt->slave != slave)
1011 list_for_each_entry_safe(p_rt, _p_rt,
1012 &s_rt->port_list, port_node) {
1013 list_del(&p_rt->port_node);
1021 * sdw_release_slave_stream() - Free Slave(s) runtime handle
1023 * @slave: Slave handle.
1024 * @stream: Stream runtime handle.
1026 * This function is to be called with bus_lock held.
1028 static void sdw_release_slave_stream(struct sdw_slave *slave,
1029 struct sdw_stream_runtime *stream)
1031 struct sdw_slave_runtime *s_rt, *_s_rt;
1032 struct sdw_master_runtime *m_rt;
1034 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1035 /* Retrieve Slave runtime handle */
1036 list_for_each_entry_safe(s_rt, _s_rt,
1037 &m_rt->slave_rt_list, m_rt_node) {
1038 if (s_rt->slave == slave) {
1039 list_del(&s_rt->m_rt_node);
1048 * sdw_release_master_stream() - Free Master runtime handle
1050 * @m_rt: Master runtime node
1051 * @stream: Stream runtime handle.
1053 * This function is to be called with bus_lock held
1054 * It frees the Master runtime handle and associated Slave(s) runtime
1055 * handle. If this is called first then sdw_release_slave_stream() will have
1056 * no effect as Slave(s) runtime handle would already be freed up.
1058 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1059 struct sdw_stream_runtime *stream)
1061 struct sdw_slave_runtime *s_rt, *_s_rt;
1063 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1064 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1065 sdw_release_slave_stream(s_rt->slave, stream);
1068 list_del(&m_rt->stream_node);
1069 list_del(&m_rt->bus_node);
1074 * sdw_stream_remove_master() - Remove master from sdw_stream
1076 * @bus: SDW Bus instance
1077 * @stream: SoundWire stream
1079 * This removes and frees port_rt and master_rt from a stream
1081 int sdw_stream_remove_master(struct sdw_bus *bus,
1082 struct sdw_stream_runtime *stream)
1084 struct sdw_master_runtime *m_rt, *_m_rt;
1086 mutex_lock(&bus->bus_lock);
1088 list_for_each_entry_safe(m_rt, _m_rt,
1089 &stream->master_list, stream_node) {
1090 if (m_rt->bus != bus)
1093 sdw_master_port_release(bus, m_rt);
1094 sdw_release_master_stream(m_rt, stream);
1095 stream->m_rt_count--;
1098 if (list_empty(&stream->master_list))
1099 stream->state = SDW_STREAM_RELEASED;
1101 mutex_unlock(&bus->bus_lock);
1105 EXPORT_SYMBOL(sdw_stream_remove_master);
1108 * sdw_stream_remove_slave() - Remove slave from sdw_stream
1110 * @slave: SDW Slave instance
1111 * @stream: SoundWire stream
1113 * This removes and frees port_rt and slave_rt from a stream
1115 int sdw_stream_remove_slave(struct sdw_slave *slave,
1116 struct sdw_stream_runtime *stream)
1118 mutex_lock(&slave->bus->bus_lock);
1120 sdw_slave_port_release(slave->bus, slave, stream);
1121 sdw_release_slave_stream(slave, stream);
1123 mutex_unlock(&slave->bus->bus_lock);
1127 EXPORT_SYMBOL(sdw_stream_remove_slave);
1130 * sdw_config_stream() - Configure the allocated stream
1133 * @stream: SoundWire stream
1134 * @stream_config: Stream configuration for audio stream
1135 * @is_slave: is API called from Slave or Master
1137 * This function is to be called with bus_lock held.
1139 static int sdw_config_stream(struct device *dev,
1140 struct sdw_stream_runtime *stream,
1141 struct sdw_stream_config *stream_config,
1145 * Update the stream rate, channel and bps based on data
1146 * source. For more than one data source (multilink),
1147 * match the rate, bps, stream type and increment number of channels.
1149 * If rate/bps is zero, it means the values are not set, so skip
1150 * comparison and allow the value to be set and stored in stream
1152 if (stream->params.rate &&
1153 stream->params.rate != stream_config->frame_rate) {
1154 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1158 if (stream->params.bps &&
1159 stream->params.bps != stream_config->bps) {
1160 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1164 stream->type = stream_config->type;
1165 stream->params.rate = stream_config->frame_rate;
1166 stream->params.bps = stream_config->bps;
1168 /* TODO: Update this check during Device-device support */
1170 stream->params.ch_count += stream_config->ch_count;
1175 static int sdw_is_valid_port_range(struct device *dev,
1176 struct sdw_port_runtime *p_rt)
1178 if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1180 "SoundWire: Invalid port number :%d\n", p_rt->num);
1187 static struct sdw_port_runtime
1188 *sdw_port_alloc(struct device *dev,
1189 struct sdw_port_config *port_config,
1192 struct sdw_port_runtime *p_rt;
1194 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1198 p_rt->ch_mask = port_config[port_index].ch_mask;
1199 p_rt->num = port_config[port_index].num;
1204 static int sdw_master_port_config(struct sdw_bus *bus,
1205 struct sdw_master_runtime *m_rt,
1206 struct sdw_port_config *port_config,
1207 unsigned int num_ports)
1209 struct sdw_port_runtime *p_rt;
1212 /* Iterate for number of ports to perform initialization */
1213 for (i = 0; i < num_ports; i++) {
1214 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1219 * TODO: Check port capabilities for requested
1220 * configuration (audio mode support)
1223 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1229 static int sdw_slave_port_config(struct sdw_slave *slave,
1230 struct sdw_slave_runtime *s_rt,
1231 struct sdw_port_config *port_config,
1232 unsigned int num_config)
1234 struct sdw_port_runtime *p_rt;
1237 /* Iterate for number of ports to perform initialization */
1238 for (i = 0; i < num_config; i++) {
1239 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1244 * TODO: Check valid port range as defined by DisCo/
1247 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1254 * TODO: Check port capabilities for requested
1255 * configuration (audio mode support)
1258 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1265 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1267 * @bus: SDW Bus instance
1268 * @stream_config: Stream configuration for audio stream
1269 * @port_config: Port configuration for audio stream
1270 * @num_ports: Number of ports
1271 * @stream: SoundWire stream
1273 int sdw_stream_add_master(struct sdw_bus *bus,
1274 struct sdw_stream_config *stream_config,
1275 struct sdw_port_config *port_config,
1276 unsigned int num_ports,
1277 struct sdw_stream_runtime *stream)
1279 struct sdw_master_runtime *m_rt;
1282 mutex_lock(&bus->bus_lock);
1285 * For multi link streams, add the second master only if
1286 * the bus supports it.
1287 * Check if bus->multi_link is set
1289 if (!bus->multi_link && stream->m_rt_count > 0) {
1291 "Multilink not supported, link %d\n", bus->link_id);
1296 m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1299 "Master runtime config failed for stream:%s\n",
1305 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1309 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1313 stream->m_rt_count++;
1318 sdw_release_master_stream(m_rt, stream);
1320 mutex_unlock(&bus->bus_lock);
1323 EXPORT_SYMBOL(sdw_stream_add_master);
1326 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1328 * @slave: SDW Slave instance
1329 * @stream_config: Stream configuration for audio stream
1330 * @stream: SoundWire stream
1331 * @port_config: Port configuration for audio stream
1332 * @num_ports: Number of ports
1334 * It is expected that Slave is added before adding Master
1338 int sdw_stream_add_slave(struct sdw_slave *slave,
1339 struct sdw_stream_config *stream_config,
1340 struct sdw_port_config *port_config,
1341 unsigned int num_ports,
1342 struct sdw_stream_runtime *stream)
1344 struct sdw_slave_runtime *s_rt;
1345 struct sdw_master_runtime *m_rt;
1348 mutex_lock(&slave->bus->bus_lock);
1351 * If this API is invoked by Slave first then m_rt is not valid.
1352 * So, allocate m_rt and add Slave to it.
1354 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1356 dev_err(&slave->dev,
1357 "alloc master runtime failed for stream:%s\n",
1363 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1365 dev_err(&slave->dev,
1366 "Slave runtime config failed for stream:%s\n",
1372 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1376 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1378 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1383 * Change stream state to CONFIGURED on first Slave add.
1384 * Bus is not aware of number of Slave(s) in a stream at this
1385 * point so cannot depend on all Slave(s) to be added in order to
1386 * change stream state to CONFIGURED.
1388 stream->state = SDW_STREAM_CONFIGURED;
1393 * we hit error so cleanup the stream, release all Slave(s) and
1396 sdw_release_master_stream(m_rt, stream);
1398 mutex_unlock(&slave->bus->bus_lock);
1401 EXPORT_SYMBOL(sdw_stream_add_slave);
1404 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1406 * @slave: Slave handle
1407 * @direction: Data direction.
1408 * @port_num: Port number
1410 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1411 enum sdw_data_direction direction,
1412 unsigned int port_num)
1414 struct sdw_dpn_prop *dpn_prop;
1418 if (direction == SDW_DATA_DIR_TX) {
1419 num_ports = hweight32(slave->prop.source_ports);
1420 dpn_prop = slave->prop.src_dpn_prop;
1422 num_ports = hweight32(slave->prop.sink_ports);
1423 dpn_prop = slave->prop.sink_dpn_prop;
1426 for (i = 0; i < num_ports; i++) {
1427 if (dpn_prop[i].num == port_num)
1428 return &dpn_prop[i];
1435 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1437 * @stream: SoundWire stream
1439 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1440 * stream to reconfigure the bus.
1441 * NOTE: This function is called from SoundWire stream ops and is
1442 * expected that a global lock is held before acquiring bus_lock.
1444 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1446 struct sdw_master_runtime *m_rt;
1447 struct sdw_bus *bus = NULL;
1449 /* Iterate for all Master(s) in Master list */
1450 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1453 mutex_lock(&bus->bus_lock);
1458 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1460 * @stream: SoundWire stream
1462 * Release the previously held bus_lock after reconfiguring the bus.
1463 * NOTE: This function is called from SoundWire stream ops and is
1464 * expected that a global lock is held before releasing bus_lock.
1466 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1468 struct sdw_master_runtime *m_rt = NULL;
1469 struct sdw_bus *bus = NULL;
1471 /* Iterate for all Master(s) in Master list */
1472 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1474 mutex_unlock(&bus->bus_lock);
1478 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1481 struct sdw_master_runtime *m_rt;
1482 struct sdw_bus *bus = NULL;
1483 struct sdw_master_prop *prop;
1484 struct sdw_bus_params params;
1487 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1488 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1491 memcpy(¶ms, &bus->params, sizeof(params));
1493 /* TODO: Support Asynchronous mode */
1494 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1495 dev_err(bus->dev, "Async mode not supported\n");
1500 goto program_params;
1502 /* Increment cumulative bus bandwidth */
1503 /* TODO: Update this during Device-Device support */
1504 bus->params.bandwidth += m_rt->stream->params.rate *
1505 m_rt->ch_count * m_rt->stream->params.bps;
1507 /* Compute params */
1508 if (bus->compute_params) {
1509 ret = bus->compute_params(bus);
1511 dev_err(bus->dev, "Compute params failed: %d",
1518 /* Program params */
1519 ret = sdw_program_params(bus, true);
1521 dev_err(bus->dev, "Program params failed: %d\n", ret);
1522 goto restore_params;
1527 pr_err("Configuration error in %s\n", __func__);
1531 ret = do_bank_switch(stream);
1533 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1534 goto restore_params;
1537 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1540 /* Prepare port(s) on the new clock configuration */
1541 ret = sdw_prep_deprep_ports(m_rt, true);
1543 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1549 stream->state = SDW_STREAM_PREPARED;
1554 memcpy(&bus->params, ¶ms, sizeof(params));
1559 * sdw_prepare_stream() - Prepare SoundWire stream
1561 * @stream: Soundwire stream
1563 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1565 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1567 bool update_params = true;
1571 pr_err("SoundWire: Handle not found for stream\n");
1575 sdw_acquire_bus_lock(stream);
1577 if (stream->state == SDW_STREAM_PREPARED) {
1582 if (stream->state != SDW_STREAM_CONFIGURED &&
1583 stream->state != SDW_STREAM_DEPREPARED &&
1584 stream->state != SDW_STREAM_DISABLED) {
1585 pr_err("%s: %s: inconsistent state state %d\n",
1586 __func__, stream->name, stream->state);
1592 * when the stream is DISABLED, this means sdw_prepare_stream()
1593 * is called as a result of an underflow or a resume operation.
1594 * In this case, the bus parameters shall not be recomputed, but
1595 * still need to be re-applied
1597 if (stream->state == SDW_STREAM_DISABLED)
1598 update_params = false;
1600 ret = _sdw_prepare_stream(stream, update_params);
1603 sdw_release_bus_lock(stream);
1606 EXPORT_SYMBOL(sdw_prepare_stream);
1608 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1610 struct sdw_master_runtime *m_rt;
1611 struct sdw_bus *bus = NULL;
1614 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1615 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1618 /* Program params */
1619 ret = sdw_program_params(bus, false);
1621 dev_err(bus->dev, "Program params failed: %d\n", ret);
1625 /* Enable port(s) */
1626 ret = sdw_enable_disable_ports(m_rt, true);
1629 "Enable port(s) failed ret: %d\n", ret);
1635 pr_err("Configuration error in %s\n", __func__);
1639 ret = do_bank_switch(stream);
1641 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1645 stream->state = SDW_STREAM_ENABLED;
1650 * sdw_enable_stream() - Enable SoundWire stream
1652 * @stream: Soundwire stream
1654 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1656 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1661 pr_err("SoundWire: Handle not found for stream\n");
1665 sdw_acquire_bus_lock(stream);
1667 if (stream->state != SDW_STREAM_PREPARED &&
1668 stream->state != SDW_STREAM_DISABLED) {
1669 pr_err("%s: %s: inconsistent state state %d\n",
1670 __func__, stream->name, stream->state);
1675 ret = _sdw_enable_stream(stream);
1678 sdw_release_bus_lock(stream);
1681 EXPORT_SYMBOL(sdw_enable_stream);
1683 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1685 struct sdw_master_runtime *m_rt;
1688 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1689 struct sdw_bus *bus = m_rt->bus;
1691 /* Disable port(s) */
1692 ret = sdw_enable_disable_ports(m_rt, false);
1694 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1698 stream->state = SDW_STREAM_DISABLED;
1700 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1701 struct sdw_bus *bus = m_rt->bus;
1703 /* Program params */
1704 ret = sdw_program_params(bus, false);
1706 dev_err(bus->dev, "Program params failed: %d\n", ret);
1711 ret = do_bank_switch(stream);
1713 pr_err("Bank switch failed: %d\n", ret);
1717 /* make sure alternate bank (previous current) is also disabled */
1718 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1719 struct sdw_bus *bus = m_rt->bus;
1721 /* Disable port(s) */
1722 ret = sdw_enable_disable_ports(m_rt, false);
1724 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1733 * sdw_disable_stream() - Disable SoundWire stream
1735 * @stream: Soundwire stream
1737 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1739 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1744 pr_err("SoundWire: Handle not found for stream\n");
1748 sdw_acquire_bus_lock(stream);
1750 if (stream->state != SDW_STREAM_ENABLED) {
1751 pr_err("%s: %s: inconsistent state state %d\n",
1752 __func__, stream->name, stream->state);
1757 ret = _sdw_disable_stream(stream);
1760 sdw_release_bus_lock(stream);
1763 EXPORT_SYMBOL(sdw_disable_stream);
1765 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1767 struct sdw_master_runtime *m_rt;
1768 struct sdw_bus *bus;
1771 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1773 /* De-prepare port(s) */
1774 ret = sdw_prep_deprep_ports(m_rt, false);
1777 "De-prepare port(s) failed: %d\n", ret);
1781 /* TODO: Update this during Device-Device support */
1782 bus->params.bandwidth -= m_rt->stream->params.rate *
1783 m_rt->ch_count * m_rt->stream->params.bps;
1785 /* Program params */
1786 ret = sdw_program_params(bus, false);
1788 dev_err(bus->dev, "Program params failed: %d\n", ret);
1793 stream->state = SDW_STREAM_DEPREPARED;
1794 return do_bank_switch(stream);
1798 * sdw_deprepare_stream() - Deprepare SoundWire stream
1800 * @stream: Soundwire stream
1802 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1804 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1809 pr_err("SoundWire: Handle not found for stream\n");
1813 sdw_acquire_bus_lock(stream);
1815 if (stream->state != SDW_STREAM_PREPARED &&
1816 stream->state != SDW_STREAM_DISABLED) {
1817 pr_err("%s: %s: inconsistent state state %d\n",
1818 __func__, stream->name, stream->state);
1823 ret = _sdw_deprepare_stream(stream);
1826 sdw_release_bus_lock(stream);
1829 EXPORT_SYMBOL(sdw_deprepare_stream);
1831 static int set_stream(struct snd_pcm_substream *substream,
1832 struct sdw_stream_runtime *sdw_stream)
1834 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1835 struct snd_soc_dai *dai;
1839 /* Set stream pointer on all DAIs */
1840 for_each_rtd_dais(rtd, i, dai) {
1841 ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
1843 dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name);
1852 * sdw_startup_stream() - Startup SoundWire stream
1854 * @sdw_substream: Soundwire stream
1856 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1858 int sdw_startup_stream(void *sdw_substream)
1860 struct snd_pcm_substream *substream = sdw_substream;
1861 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1862 struct sdw_stream_runtime *sdw_stream;
1866 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1867 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1869 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1874 sdw_stream = sdw_alloc_stream(name);
1876 dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name);
1881 ret = set_stream(substream, sdw_stream);
1883 goto release_stream;
1887 sdw_release_stream(sdw_stream);
1888 set_stream(substream, NULL);
1893 EXPORT_SYMBOL(sdw_startup_stream);
1896 * sdw_shutdown_stream() - Shutdown SoundWire stream
1898 * @sdw_substream: Soundwire stream
1900 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1902 void sdw_shutdown_stream(void *sdw_substream)
1904 struct snd_pcm_substream *substream = sdw_substream;
1905 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1906 struct sdw_stream_runtime *sdw_stream;
1907 struct snd_soc_dai *dai;
1909 /* Find stream from first CPU DAI */
1910 dai = asoc_rtd_to_cpu(rtd, 0);
1912 sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
1915 dev_err(rtd->dev, "no stream found for DAI %s", dai->name);
1919 /* release memory */
1920 kfree(sdw_stream->name);
1921 sdw_release_stream(sdw_stream);
1923 /* clear DAI data */
1924 set_stream(substream, NULL);
1926 EXPORT_SYMBOL(sdw_shutdown_stream);